BMA222
BMA222 sensor
Digital, triaxial acceleration
Data sheet
Bosch Sensortec
Data sheet
Bosch Sensortec
BMA222 Data sheet
Ordering code
Please contact your Bosch Sensortec representative for the ordering code
Package type
12-pin LGA
Document revision
1.15
Document release date
31 May 2012
Document number
BST-BMA222-DS002-05
Technical reference code(s)
0 273 141 120
Notes
Rev. 1.15
Data in this document are subject to change without notice. Product photos
and pictures
are
for for
illustration
purposes only and may 31
differ
from- 2012
the real
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/ not
publishing
- May
product‟s appearance.
© Bosch Sensortec GmbH reserves allNot
rights
even in the
of industrial property rights. We reserve all rights of disposal such
intended
forevent
publishing.
as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
BMA222
Data sheet
Bosch Sensortec
BMA222
Digital, triaxial 2g to 16g acceleration sensor
with intelligent on-chip motion-triggered interrupt controller
Key features
•
•
•
•
•
•
Ultra-Small package
LGA package (12 pins), footprint 2mm x 2mm,
height 0.95mm
Digital interface
SPI (4-wire, 3-wire), I²C, 2 interrupt pins
VDDIO voltage range: 1.2V to 3.6V
Programmable functionality Acceleration ranges ±2g/±4g/±8g/±16g
Low-pass filter bandwidths 1kHz - 0V). To switch off the
interface supply (VDDIO = 0V) and keep the internal supply on (VDD > 0V) is safe only in normal
mode. If the device is in low-power mode or suspend mode while VDDIO = 0V, there is a risk of
excess current consumption on the VDD supply (non-destructive).
It is absolutely prohibited to keep any interface at a logical high level when V DDIO is switched off.
Such a configuration will permanently damage the device (i.e. if VDDIO = 0 [SDI & SDO & SCK
& CSB] ≠ high).
The device contains a power-on reset (POR) generator. It resets the logic part and the register
values after powering-on VDD and VDDIO. There is no limitation on the sequence of switching on
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
both supply voltages. In case the I²C interface shall be used, a direct electrical connection
between VDDIO supply and the PS pin is needed in order to ensure reliable protocol selection
(see section 4.2 Operational modes).
4.2 Operational modes
Depending on the configuration the BMA222 is able to operate in two different operational
modes:
General mode: The device is acting as a slave on a digital interface (SPI or I²C) and is
controlled by the external bus master (e.g. µC). The master gets measurement data and
status information from the device through the digital interface. In particular, the master
can configure the interrupt controller and read out the interrupt status registers.
Moreover, it can freely configure and use the two interrupt pins (INT1, INT2). Several
interrupts may be enabled in parallel.
Dedicated mode: The dedicated mode allows the sensor to be operated as a standalone device in a simple µC-less system without abandon of the interrupt functionality.
No digital interface is needed and, as a consequence, no measurement data can be
read from the device. Instead of the digital interface the internal interrupt engine with its
default setting is used. The interrupt status is mapped onto dedicated output pins. One
out of three different sub-modes can be chosen: A) orientation recognition, B) tap
sensing or C) slope (any-motion) detection. Only one interrupt at a time can be
assigned.
The selection of the operational mode is done during start-up or reset by the state of the PS pin.
If PS is floating, the dedicated mode is selected. A defined digital state selects the general
mode. All pads are in input mode (no output driver active) during the start-up sequence until the
operational mode and, in case of the general mode, the interface type is selected. The start-up
sequence is run after power-up and after reset.
Figure 2 illustrates the selection of the different operational modes:
reset
yes
PS floating?
Dedicated Mode
no
General Mode
check configuration pins
no
Table 4 & Table 5
PS = 0?
yes
Sub-Mode A
Sub-Mode B
Sub-Mode C
Orientation Sens.
Tap Sens.
Slope Sens.
Orientation Interrupt
is enabled
Tap sensing Interrupt
is enabled
Any-Motion Interrupt
is enabled
General Mode
with I²C
General Mode
with SPI
One or more
interrupts can be
configured via I²C
One or more
interrupts can be
configured via SPI
Figure 2: Operational mode selection
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
4.2.1 General mode
A defined digital state at the PS pin selects the general mode. Its polarity determines the kind of
interface to be used:
PS = GND
PS = VDDIO
PS = float
enables the digital SPI interface
enables the digital I²C interface
enables the dedicated mode
4.2.2 Dedicated mode (µC-less or stand-alone mode)
The dedicated mode operates with pre-defined settings of the interrupt engine in order to
generate the motion-triggered interrupt-signals, i.e. bandwidth, sleep time, low-power mode,
threshold, and hysteresis are use case optimized. Nevertheless some minor configurations can
be selected by the user. The dedicated mode is entered if the device is connected according to
table 3. During the start-up / power on sequence the PS pin (#11) must float.
Table 3: Entering and operating dedicated mode
VDDIO
NC
VDD
GNDIO
GND
PS
Pin#3
Pin#4
Pin#7
Pin#8
Pin#9
Pin#11
VDDIO
NC
VDD
GND
GND
float
Depending on the configuration of the other device pins according to table 4 the corresponding
sub-mode of the dedicated mode is entered. In table 4 and table 5 the unshaded entries
represent necessary input values for the corresponding sub-mode selection while the shaded
entries represent corresponding output parameters of the events to be detected.
Table 4: Sub-mode selection and specific outputs of the dedicated mode
Sub-Mode
Orientation
Tap
Slope
SDO
SDx
INT1
INT2
CSB
SCx
Pin#1
Pin#2
Pin#5
Pin#6
Pin#10
Pin#12
GND
output
output
output
output
select
orient1-detect
orient0-detect
orient2-detect
flat-detect
orient sleep
output
output
GND
double-detect
single-detect
GND
output
motion-detect
VDD
select
select
tap type
tap sleep
GND
select
slope sleep
VDD
VDD
Table 5 contains state and description details of the parameters introduced in table 4.
Unshaded entries represent input values to be set, shaded entries represent output parameters
to be detected.
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as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
Table 5: Description of the parameters of table 4
Sub-Mode
Parameter
State
Description
see Table 4
output
orient0-detect
output
orient1-detect
Orientation
BW = 62.5 Hz
output
orient2-detect
output
flat-detect
select
orient sleep
output
double-detect
output
Tap
single-detect
BW = 1k Hz
select
tap type
select
tap sleep
output
Slope
motion-detect
BW = 125 Hz
select
slope sleep
low
high
low
high
low
high
low
high
GND
VDD
low
high
low
high
GND
VDD
GND
VDD
low
high
GND
VDD
“upright” for portrait / “left” for landscape
“upside-down” for portrait / “right” for landscape
portrait
landscape
z-axis upward looking i.e. || < 90° (Fig. 8)
z-axis downward looking i.e. || > 90° (Fig. 8)
non flat i.e. || > 19,5° (Fig. 8)
flat i.e. || < 19,5° (Fig. 8)
Low-Power mode enabled, sleep time = 100ms
Low-Power mode enabled, sleep time = 1s
currently no Double-Tap event
Double-Tap event detected
currently no single-tap event
Single-Tap event detected
Single-Tap detection enabled
Double-Tap detection enabled
Low-Power Mode disabled
Low-Power Mode enabled, sleep time = 10ms
currently no Any-Motion event
Any-Motion event detected
Low-Power mode enabled, sleep time = 50ms
Low-Power mode enabled, sleep time = 1s
low = GND, high = VDDIO
For more details, refer to chapter 4.3 Power modes and 4.8 Interrupt Controller
Orientation recognition sub mode
refer to chapter 4.8.7
Tap sensing sub mode
refer to chapter 4.8.6
Any-motion (slope) detection) sub mode
refer to chapter 4.8.5
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as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
4.3 Power modes
The BMA222 has three different power modes. Besides normal mode, which represents the
fully operational state of the device, there are two special energy saving modes: low-power
mode and suspend mode.
The possible transitions between the power modes are illustrated in figure 3:
Power off
Normal
Mode
Low-Power
Mode
Suspend
Mode
Figure 3: Power mode transition diagram
In normal mode, all parts of the electronic circuit are held powered-up and data acquisition is
performed continuously.
In contrast to this, in suspend mode the whole analog part, oscillators included, is powered
down. No data acquisition is performed, the only supported operations are reading registers
(latest acceleration data are kept) and writing to the (0x11) suspend bit or (0x14) softreset
register. Suspend mode is entered (left) by writing ´1´ (´0´) to the (0x11) suspend bit.
In low-power mode, the device is periodically switching between a sleep phase and a wake-up
phase. The wake-up phase essentially corresponds to operation in normal mode with complete
power-up of the circuitry. During the sleep phase the analog part except the oscillators is
powered down. Low-power mode is entered (left) by writing ´1´ (´0´) to the (0x11) lowpower_en
bit.
During the wake-up phase the number of samples required by any enabled interrupt is
processed. If an interrupt is detected, the device stays in the wake-up phase as long as the
interrupt condition endures (non-latched interrupt), or until the latch time expires (temporary
interrupt), or until the interrupt is reset (latched interrupt). If no interrupt is detected, the device
enters the sleep phase.
The duration of the sleep phase is set by the (0x11) sleep_dur bits as shown in the following
table:
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as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
Table 6: Sleep phase duration settings
(0x11)
sleep_dur
0000b
0001b
0010b
0011b
0100b
0101b
0110b
0111b
1000b
1001b
1010b
1011b
1100b
1101b
1110b
1111b
Sleep Phase
Duration
tsleep
0.5ms
0.5ms
0.5ms
0.5ms
0.5ms
0.5ms
1ms
2ms
4ms
6ms
10ms
25ms
50ms
100ms
500ms
1s
The current consumption of the BMA222 can be calculated according to this formula:
I DDlp
t sleep I DDsm t active I DD
t sleep t active
.
When making an estimation about the length of the wake-up phase tactive, the wake-up time,
tw_up, has to be considered. Therefore, tactive = tut + tw_up, where tut is given in table 8. During the
wake-up phase all analog modules are held powered-up, while during the sleep phase most
analog modules are powered down. As a consequence, a wake-up time of less than 1ms (typ.
value 0.8ms) is needed to settle the analog modules in order to get reliable acceleration data.
Table 7 gives an overview of the resulting average supply currents IDDlpe for the different sleep
phase durations and a selected bandwidth of 1000Hz, assuming no interrupt is active and thus
only one sample per wake-up phase is taken:
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Note: Specifications within this document are subject to change without notice.
BMA222
Data sheet
Bosch Sensortec
Table 7: Average current consumption in low-power mode
Sleep phase
duration
0.5ms
1ms
2ms
4ms
6ms
10ms
25ms
50ms
100ms
500ms
1s
Average
current
consumption
100.5 µA
78.8 µA
55.0 µA
34.5 µA
25.2 µA
16.4 µA
7.4 µA
4.0 µA
2.3 µA
0.9 µA
0.7 µA
4.4 Sensor data
4.4.1 Acceleration data
The width of acceleration data is 8 bits given in two´s complement representation. The 8 bits for
each axis are given in registers (0x03) acc_x, (0x05) acc_y and, (0x07) acc_z.
The corresponding new data flags are given as (0x02) new_data_x, (0x04) new_data_y and
(0x06) new_data_z. The remaining bits of these registers are fixed to 0.
The new data flags (0x02) new_data_x, (0x04) new_data_y and (0x06) new_data_z are set if
the corresponding acceleration data registers (0x03) acc_x, (0x05) acc_y or, (0x07) acc_z have
internally been updated. They are reset if the corresponding acceleration data registers have
been read.
Two different streams of acceleration data are available, unfiltered and filtered. The unfiltered
data is sampled with 2kHz. The sampling rate of the filtered data depends on the selected filter
bandwidth; it is twice the bandwidth. Which kind of data is stored in the acceleration data
registers depends on bit (0x13) data_high_bw. If (0x13) data_high_bw is ´0´ (´1´), then filtered
(unfiltered) data is stored in the registers. Both data streams are separately offsetcompensated. Both kinds of data can be processed by the interrupt controller.
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
The bandwidth of filtered acceleration data is determined by setting the (0x10) bw bit as
followed:
Table 8: Bandwidth configuration
bw
Bandwidth
00xxx
01000
01001
01010
01011
01100
01101
01110
01111
1xxxx
*)
7.81Hz
15.63Hz
31.25Hz
62.5Hz
125Hz
250Hz
500Hz
1000Hz
*)
Update Time
tut
64ms
32ms
16ms
8ms
4ms
2ms
1ms
0.5ms
-
*) Note: Settings 00xxx result in a bandwidth of 7.81 Hz; settings 1xxxx result in a bandwidth of
1000 Hz. It is recommended to actively use the range from ´01000b´ to ´01111b´ only in order to
be compatible with future products.
The BMA222 supports four different acceleration measurement ranges. A measurement range
is selected by setting the (0x0F) range bits as follows:
Table 9: Range selection
Range
0011
0101
1000
1100
others
Acceleration
measurement
range
±2g
±4g
±8g
±16g
reserved
Resolution
15.6mg/LSB
31.3mg/LSB
62.5mg/LSB
125mg/LSB
-
4.4.2 Temperature data
The width of temperature data is 8 bits given in two´s complement representation. Temperature
values are available in the (0x08) temp register.
The slope of the temperature sensor is 0.5K/LSB, its center temperature is 24°C [(0x08) temp =
0x00]. Therefore, the typical temperature measurement range is -40°C up to 87.5°C.
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
4.5 Self-test
This feature permits to check the sensor functionality by applying electrostatic forces to the
sensor core instead of external accelerations. By actually deflecting the seismic mass, the
entire signal path of the sensor can be tested. Activating the self-test results in a static offset of
the acceleration data; any external acceleration or gravitational force applied to the sensor
during active self-test will be observed in the output as a superposition of both acceleration and
self-test signal.
The self-test is activated individually for each axis by writing the proper value to the (0x32)
self_test_axis bits (´01b´ for x-axis, ´10b´ for y-axis, ´11b´ for z-axis, ´00b´ to deactivate selftest). It is possible to control the direction of the deflection through bit (0x32) self_test_sign. The
excitation occurs in positive (negative) direction if (0x32) self_test_sign = ´0b´ (´1b´).
In order to ensure a proper interpretation of the self-test signal it is recommended to perform the
self-test for both (positive and negative) directions and then to calculate the difference of the
resulting acceleration values. Table 10 shows the minimum differences for each axis. The
actually measured signal differences can be significantly larger.
Table 10: Self-test difference values
resulting
minimum
difference signal
x-axis signal
y-axis signal
z-axis signal
+0.8 g
+0.8 g
+0.4 g
It is recommended to perform a reset of the device after self-test. If the reset cannot be
performed, the following sequence must be kept to prevent unwanted interrupt generation:
disable interrupts, change parameters of interrupts, wait for at least 600 s, enable desired
interrupts.
4.6 Offset compensation
Offsets in measured signals can have several causes but they are always unwanted and
disturbing in many cases. Therefore, the BMA222 offers an advanced set of four digital offset
compensation methods which are closely matched to each other. These are slow, fast, and
manual compensation, and inline calibration.
The compensation is performed for unfiltered and filtered data independently. It is done by
adding a compensation value to the acceleration data coming from the ADC. The result of this
computation is saturated if necessary to prevent any overflow errors (the smallest or biggest
possible value is set, depending on the sign). However, the public registers used to read and
write compensation values have only a width of 8 bits.
An overview of the offset compensation principle is given in figure 4:
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
public register
add to
acceleration data
offset_filt_x/y/z
or
offset_unfilt_x/y/z
in range
±2g
bit_11
bit_10
bit_9
bit_8
bit_7
bit_6
bit_5
bit_4
bit_3
bit_2
bit_1
bit_0
±4g
±8g
±16g
sign (msb)
sign (msb)
sign (msb)
sign (msb)
sign (msb)
500mg
250mg
125mg
range
62.5mg conversion
31.3mg
15.6mg
7.8mg (lsb)
500mg
250mg
125mg
62.5mg
31.3mg
15.6mg
500mg
250mg
125mg
62.5mg
31.3mg
500mg
250mg
125mg
62.5mg
500mg
250mg
125mg
Figure 4: Principle of offset compensation
In dependence to the measurement range which has been set, the compensation value, which
has been written into the public register will correct the data output according to figure 4.
e.g. ±2g range:
public register = 00000001b add to acceleration data = ±0mg
public register = 00000010b add to acceleration data = +15.6mg
public register = 00000101b add to acceleration data = +31.3mg
= ±0LSB
= +1LSB
= +2LSB
The public registers are image registers of EEPROM registers. With each image update (see
section 4.7 Non-volatile memory” for details) the contents of the non-volatile EEPROM registers
is written to the public registers. At any time the public register can be over-written by the user.
After changing the contents of the public registers by either an image update or manually, all
values are stored in the corresponding internal registers. In the opposite direction, if the value of
an internal register changes due to the computation performed by a compensation algorithm, it
is stored in the public register.
For slow and fast offset compensation, the compensation target can be chosen by setting the
bits (0x37) offset_target_x, (0x37) offset_target_y, and (0x37) offset_target_z according to table
11:
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Bosch Sensortec
Data sheet
Table 11: Offset target settings
(0x37)
offset_target_x/y/z
00b
01b
10b
11b
Target value
0g
+1g
-1g
0g
By writing ´1´ to the (0x36) offset_reset bit, all offset compensation registers are reset to zero.
4.6.1 Slow compensation
Slow compensation is a quasi-continuous process which regulates the acceleration value of
each axis towards the target value by comparing the current value with the target and adding or
subtracting a fixed value depending on the comparison.
The algorithm in detail: If an acceleration value is larger (smaller) than the target value (0x37)
offset_target_x/y/z for a number of samples (given by the parameter Offset Period see table
11), the internal offset compensation value (0x38, 0x039, 0x3A) offset_filt_x/y/z or (0x3B,
0x03C, 0x3D) offset_unfilt_x/y/z is decremented (incremented) by 4 LSB.
The public registers (0x38, 0x039, 0x3A) offset_filt_x/y/z and (0x3B, 0x03C, 0x3D)
offset_unfilt_x/y/z are not used for the computations but they are updated with the contents of
the internal registers (using saturation if necessary) and can be read by the user.
The compensation period offset_period is set by the (0x37) cut_off bit as represented in table
12:
Table 12: Compensation period settings
(0x37)
cut_off
0b
1b
Offset
Period
8
16
The slow compensation can be enabled (disabled) for each axis independently by setting the
bits (0x36) hp_x_en, hp_y_en, hp_z_en to ´1´ (´0´), respectively.
Slow compensation should not be used in combination with low-power mode. In low-power
mode the conditions (availability of necessary data) for proper function of slow compensation
are not fulfilled.
4.6.2 Fast compensation
Fast compensation is a one-shot process by which the compensation value is set in such a way
that when added to the raw acceleration, the resulting acceleration value of each axis equals
the target value.
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Note: Specifications within this document are subject to change without notice.
BMA222
Data sheet
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The algorithm in detail: An average of 16 consecutive acceleration values is computed and the
difference between target value and computed value is written to (0x38, 0x39, 0x3A)
offset_filt_x/y/z or (0x3B, 0x3C, 0x3D) offset_unfilt_x/y/z The public registers (0x38, 0x39,
0x3A) offset_filt_x/y/z and (0x3B, 0x3C, 0x3D) offset_unfilt_x/y/z are updated with the contents
of the internal registers (using saturation if necessary) and can be read by the user.
Fast compensation is triggered for each axis individually by setting the (0x36) cal_trigger bits as
shown in table 13:
Table 13: Fast compensation axis selection
(0x36)
cal_trigger
00b
01b
10b
11b
Selected Axis
none
x
y
z
The register (0x36) cal_trigger keeps its non-zero value while the fast compensation procedure
is running. Slow compensation is blocked as long as fast compensation endures. Bit (0x36)
cal_rdy is ´0´ when (0x36) cal_trigger is not ´00´.
Fast compensation should not be used in combination with low-power mode. In low-power
mode the conditions (availability of necessary data) for proper function of fast compensation are
not fulfilled.
4.6.3 Manual compensation
As explained above, the contents of the public compensation registers (0x38, 0x39, 0x3A)
offset_filt_x/y/z and (0x3B, 0x3C, 0x3D) offset_unfilt_x/y/z can be set manually via the digital
interface. It is recommended to write into these registers immediately after a new data interrupt
in order not to disturb running offset computations.
Writing to the offset compensation registers is not allowed if slow compensation is enabled or if
the fast compensation procedure is running.
4.6.4 Inline calibration
For a given application, it is often desirable to calibrate the offset once and to store the
compensation values permanently. This can be achieved by using one of the aforementioned
offset compensation methods to determine the proper compensation values and then storing
these values permanently in the non-volatile memory (EEPROM). See section 4.7 Non-volatile
memory for details of the storing procedure.
Each time the device is reset, the compensation values are loaded from the non-volatile
memory into the image registers and used for offset compensation until they are possibly
overwritten using one of the other compensation methods.
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Note: Specifications within this document are subject to change without notice.
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Data sheet
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4.7 Non-volatile memory
The entire memory of the BMA222 consists of three different kinds of registers: hard-wired,
volatile, and non-volatile. Non-volatile memory is implemented as EEPROM. Part of it can be
both read and written by the user. Access to non-volatile memory is only possible through
(volatile) image registers.
Altogether, there are eight registers (bytes) of EEPROM which are accessible by the customer.
The addresses of the image registers range from 0x38 to 0x3F. While the addresses up to
0x3D are used for offset compensation (see 4.6 Offset Compensation), addresses 0x3E and
0x3F are general purpose registers not linked to any sensor-specific functionality.
The content of the EEPROM is loaded to the image registers after a reset (either POR or
softreset) or after a user request which is performed by writing ´1´ to bit (0x33) nvm_load. As
long as the image update is not yet complete, bit (0x33) nvm_load is ´1´, otherwise it is ´0´.
The image registers can be read and written like any other register.
Writing to the EEPROM is a three-step procedure:
1. Write the new contents to the image registers.
2. Write ´1´ to bit (0x33) nvm_prog_mode in order to unlock the EEPROM.
3. Write ´1´ to bit (0x33) nvm_prog_trig and keep ´1´ in bit (0x33) nvm_prog_mode in order
to trigger the write process.
Writing to the EEPROM always renews the entire EEPROM contents. It is possible to check the
write status by reading bit (0x33) nvm_rdy. While (0x33) nvm_rdy = ´0´, the write process is still
enduring; if (0x33) nvm_rdy = ´1´, then writing is completed. As long as the write process is
ongoing, no power mode change and no image update is allowed. It is forbidden to write to the
EEPROM while the image update is running, in low-power mode, and in suspend mode.
4.8 Interrupt controller
Seven interrupt engines are integrated in the BMA222. Each interrupt can be independently
enabled and configured. If the condition of an enabled interrupt is fulfilled, the corresponding
status bit is set to ´1´ and the selected interrupt pin is activated. There are two interrupt pins,
INT1 and INT2; interrupts can be freely mapped to any of these pins. The pin state is a logic ´or´
combination of all mapped interrupts.
The interrupt status registers are updated together with writing new data into the acceleration
data registers. If an interrupt is disabled, all active status bits and pins are immediately reset.
All time constants are based upon the typical frequency of the internal oscillator. This is
reflected by the bandwidths (bw) as specified in table 1.
4.8.1 General features
An interrupt is cleared depending on the selected interrupt mode, which is common to all
interrupts. There are three different interrupt modes: non-latched, latched, and temporary. The
mode is selected by the (0x21) latch_int bits according to table 14
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Table 14: Interrupt mode selection
(0x21)
latch_int
0000b
0001b
0010b
0011b
0100b
0101b
0110b
0111b
1000b
1001b
1010b
1011b
1100b
1101b
1110b
1111b
Interrupt mode
non-latched
temporary, 250ms
temporary, 500ms
temporary, 1s
temporary, 2s
temporary, 4s
temporary, 8s
latched
non-latched
temporary, 500µs
temporary, 500µs
temporary, 1ms
temporary, 12.5ms
temporary, 25ms
temporary, 50ms
latched
An interrupt is generated if its activation condition is met. It can not be cleared as long as the
activation condition is fulfilled. In the non-latched mode the interrupt status bit and the selected
pin (the contribution to the ´or´ condition for INT1 and/or INT2) are cleared as soon as the
activation condition is no more valid. Exceptions to this behaviour are the new data, orientation,
and flat interrupts, which are automatically reset after a fixed time.
In the latched mode an asserted interrupt status and the selected pin are cleared by writing ´1´
to bit (0x21) reset_int. If the activation condition still holds when it is cleared, the interrupt status
is asserted again with the next change of the acceleration registers.
In the temporary mode an asserted interrupt and selected pin are cleared after a defined period
of time. The behaviour of the different interrupt modes is shown graphically in figure 5:
internal signal from
interrupt engine
interrupt output
non-latched
latch period
temporary
latched
Figure 5: Interrupt modes
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Several interrupt engines can use either unfiltered or filtered acceleration data as their input. For
these interrupts, the source can be selected with the respective (0x1E) int_src_... bits, in details
these are (0x1E) int_src_data, (0x1E) int_src_tap, (0x1E) int_src_slope, (0x1E ) int_src_high,
and (0x1E) int_src_low. Setting the respective bits to ´0´ (´1´) selects filtered (unfiltered) data as
input. For the other interrupts, orientation recognition and flat detection, such a selection is not
possible. They always use filtered input data.
It is strongly recommended to set interrupt parameters prior to enabling the interrupt. Changing
parameters of an already enabled interrupt may cause unwanted interrupt generation and
generation of a false interrupt history. A safe way to change parameters of an enabled interrupt
is to keep the following sequence: disable the desired interrupt, change parameters, wait for at
least 600 s, enable the desired interrupt.
4.8.2 Mapping (inttype to INT Pin#)
The mapping of interrupts to the interrupt pins #05 or #06 is done by registers (0x19) to (0x1B).
Setting (0x19) int1_”inttyp” to ´1´ (´0´) maps (unmaps) “inttyp” to pin #5 (INT1), correspondingly
setting (0x1B) int2_”inttyp” to ´1´ (´0´) maps (unmaps) “inttyp” to pin #6 (INT2).
Note: “inttyp” to be replaced with the precise notation, given in the memory map in chapter 5.
Example: For flat interrupt (int1_flat): Setting (0x19) int1_flat to ´1´ maps int1_flat to pin #5
(INT1).
4.8.3 Electrical behaviour (INT pin# to open-drive or push-pull)
Both interrupt pins can be configured to show desired electrical behaviour. The ´active´ level of
each pin is determined by the (0x20) int1_lvl and (0x20) int2_lvl bits.
If (0x20) int1_lvl = ´1´ (´0´) / (0x20) int2_lvl = ´1´ (´0´), then pin #05 (INT1) / pin #06 (INT2) is
active ´1´ (´0´). In addition to that, also the electric type of the interrupt pins can be selected. By
setting bits (0x20) int1_od / (0x20) int2_od to ´0´, the interrupt pin output type gets push-pull, by
setting the configuration bits to ´1´, the output type gets open-drive.
Remark: Due to their use for sub-mode selection in dedicated mode, the states of both INT pins
are not defined during the first 2 ms after power-up.
4.8.4 New data interrupt
This interrupt serves for synchronous reading of acceleration data. It is generated after storing a
new value of z-axis acceleration data in the data register. The interrupt is cleared automatically
when the next cycle of data acquisition starts. The interrupt status is ´0´ for at least 50µs.
The interrupt mode of the new data interrupt is fixed to non-latched.
It is enabled (disabled) by writing ´1´ (´0´) to bit (0x17) data_en. The interrupt status is stored in
bit (0x0A) data_int.
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4.8.5 Any-motion (slope) detection
Any-motion detection uses the slope between successive acceleration signals to detect
changes in motion. An interrupt is generated when the slope (absolute value of acceleration
difference) exceeds a preset threshold. It is cleared as soon as the slope falls below the
threshold. The principle is made clear in figure 6.
acceleration
acc(t0)
acc(t0−1/(2*bw))
time
slope(t0)=acc(t0)−acc(t0−1/(2*bw))
slope
slope_th
time
slope_dur
slope_dur
INT
time
Figure 6: Principle of any-motion detection
The threshold is set with the value of register (0x28) slope_th. 1 LSB of (0x28) slope_th
corresponds to 1 LSB of acceleration data. Therefore, an increment of (0x28) slope_th is
15.6 mg in 2g-range (31.3 mg in 4g-range, 62.5 mg in 8g-range and 125 mg in 16g-range). And
the maximum value is 996 mg in 2g-range (1.99g in 4g-range, 3.98g in 8g-range and 7.97g in
16g-range).
The time difference between the successive acceleration signals depends on the selected
bandwidth and equates to 1/(2*bandwidth) (Δt=1/(2*bw)). In order to suppress failure signals,
the interrupt is only generated (cleared) if a certain number N of consecutive slope data points
is larger (smaller) than the slope threshold given by (0x28) slope_th. This number is set by the
(0x27) slope_dur bits. It is N = (0x27) slope_dur + 1 for (0x27).
Example: (0x27) slope_dur = 00b, …, 11b = 1decimal, …, 4decimal
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4.8.5.1 Enabling (disabling) for each axis
Any-motion detection can be enabled (disabled) for each axis separately by writing ´1´ (´0´) to
bits (0x16) slope_en_x, (0x16) slope_en_y, (0x16) slope_en_z. The criteria for any-motion
detection are fulfilled and the slope interrupt is generated if the slope of any of the enabled axes
exceeds the threshold (0x28) slope_th for [(0x27) slope_dur +1] consecutive times. As soon as
the slopes of all enabled axes fall or stay below this threshold for [(0x27) slope_dur +1]
consecutive times the interrupt is cleared unless interrupt signal is latched.
4.8.5.2 Axis and sign information of any motion interrupt
The interrupt status is stored in bit (0x09) slope_int. The any-motion interrupt supplies additional
information about the detected slope. The axis which triggered the interrupt is given by that one
of bits (0x0B) slope_first_x, (0x0B) slope_first_y, (0x0B) slope_first_z that contains a ´1´. The
sign of the triggering slope is held in bit (0x0B) slope_sign. If (0x0B) slope_sign = ´0´ (´1´), the
sign is positive (negative).
4.8.5.3 Serial interface and dedicated wake-up mode
When serial interface is active, any-motion detection logic is enabled if any of the axis specific
(0x16) slope_en_... register bits are set. To disable the any-motion interrupt, clear all the axis
specific (0x16) slope_en_... bits.
In the dedicated wake-up mode (see chapter 4.2.2), all three axes are enabled for any-motion
detection whether the individual axis enable bits are set or not.
4.8.6 Tap sensing
Tap sensing has a functional similarity with a common laptop touch-pad or clicking keys of a
computer mouse. A tap event is detected if a pre-defined slope of the acceleration of at least
one axis is exceeded. Two different tap events are distinguished: A „single tap‟ is a single event
within a certain time, followed by a certain quiet time. A „double tap‟ consists of a first such
event followed by a second event within a defined time frame.
Only one of the tap interrupts can be enabled at the same time. Single tap interrupt is enabled
(disabled) by writing ´1´ (´0´) to bit (0x16) s_tap_en. Double tap interrupt is enabled (disabled)
by writing ´1´ (´0´) to bit (0x16) d_tap_en. If one tries to enable both interrupts by writing ´1´ to
(0x16) s_tap_en and (0x16) d_tap_en, then only (0x16) d_tap_en keeps the value ´1´ and the
double tap interrupt is enabled.
The status of the single tap interrupt is stored in bit (0x09) s_tap_int, the status of the double
tap interrupt is stored in bit (0x09) d_tap_int.
The slope threshold for detecting a tap event is set by bits (0x2B) tap_th. The meaning of
(0x2B) tap_th depends on the range setting. 1 LSB of (0x2B) tap_th corresponds to a slope of
62.5mg in 2g-range, 125mg in 4g-range, 250mg in 8g-range, and 500mg in 16g-range.
In figure 7 the meaning of the different timing parameters is visualized:
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slope
1st tap
2nd tap
tap_th
time
tap_shock
tap_quiet
tap_dur
tap_shock
tap_quiet
single tap detection
12.5 ms
time
double tap detection
12.5 ms
time
Figure 7: Timing of tap detection
The parameters (0x2A) tap_shock and (0x2A) tap_quiet apply to both single tap and double tap
detection, while (0x2A) tap_dur applies to double tap detection only. Within the duration of
(0x2A) tap_shock any slope exceeding (0x2B) tap_th after the first event is ignored. Contrary to
this, within the duration of (0x2A) tap_quiet no slope exceeding (0x2B) tap_th must occur,
otherwise the first event will be cancelled.
4.8.6.1 Single tap detection
A single tap is detected and the single tap interrupt is generated after the combined durations of
(0x2A) tap_shock and (0x2A) tap_quiet, if the corresponding slope conditions are fulfilled. The
interrupt is cleared after a delay of 12.5 ms.
4.8.6.2 Double tap detection
A double tap is detected and the double tap interrupt is generated if an event fulfilling the
conditions for a single tap occurs within the set duration in (0x2A) tap_dur after the completion
of the first tap event. The interrupt is cleared after a delay of 12.5 ms.
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4.8.6.3 Selecting the timing of tap detection
For each of parameters (0x2A) tap_shock and (0x2A) tap_quiet two values are selectable. By
writing ´0´ (´1´) to bit (0x2A) tap_shock the duration of (0x2A) tap_shock is set to 50 ms (75
ms). By writing ´0´ (´1´) to bit (0x2A) tap_quiet the duration of (0x2A) tap_quiet is set to 30 ms
(20 ms).
The length of (0x2A) tap_dur can be selected by setting the (0x2A) tap_dur bits according to
table 15:
Table 15: Selection of tap_dur
(0x2A)
tap_dur
000b
001b
010b
011b
100b
101b
110b
111b
length of tap_dur
50 ms
100 ms
150 ms
200 ms
250 ms
375 ms
500 ms
700 ms
4.8.6.4 Axis and sign information of tap sensing
The sign of the slope of the first tap which triggered the interrupt is stored in bit (0x0B) tap_sign
(´0´ means positive sign, ´1´ means negative sign). The value of this bit persists after clearing
the interrupt.
The axis which triggered the interrupt is indicated by bits (0x0B) tap_first_x, (0x0B) tap_first_y,
and (0x0B) tap_first_z.
The bit corresponding to the triggering axis contains a ´1´ while the other bits hold a ´0´. These
bits are cleared together with clearing the interrupt status.
4.8.6.5 Tap sensing in low power mode
In low-power mode, a limited number of samples is processed after wake-up to decide whether
an interrupt condition is fulfilled. The number of samples is selected by bits (0x2B) tap_samp
according to table 16.
Table 16: Meaning of (0x2B) tap_samp
(0x2B)
tap_samp
00b
01b
10b
11b
Rev. 1.15
Number of
Samples
2
4
8
16
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4.8.7 Orientation recognition
The orientation recognition feature informs on an orientation change of the sensor with respect
to the gravitational field vector „g‟. The measured acceleration vector components with respect
to the gravitational field are defined as shown in figure 8.
z
x
j
y
g
Figure 8: Definition of vector components
Therefore, the magnitudes of the acceleration vectors are calculated as follows:
acc_x = 1g∙sin∙cosj
acc_y = −1g∙sin∙sinj
acc_z = 1g∙cos
→ acc_y/acc_x = −tanj
Depending on the magnitudes of the acceleration vectors the orientation of the device in the
space is determined and stored in the three (0x0C) orient bits. These bits may not be reset in
the sleep phase of low-power mode. There are three orientation calculation modes with different
thresholds for switching between different orientations: symmetrical, high-asymmetrical, and
low-asymmetrical. The mode is selected by setting the (0x2C) orient_mode bits as given in
table 17.
Table 17: Orientation mode settings
(0x2C)
orient_mode
00b
01b
10b
11b
Rev. 1.15
Orientation Mode
symmetrical
high-asymmetrical
low-asymmetrical
symmetrical
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For each orientation mode the (0x0C) orient bits have a different meaning as shown in table 18
to table 20:
Table 18: Meaning of the (0x0C) orient bits in symmetrical mode
(0x0C)
orient
x00
Name
Angle
Condition
portrait upright
315° < j < 45°
x01
portrait upside down
135° < j < 225°
x10
landscape left
45° < j < 135°
x11
landscape right
225° < j < 315°
|acc_y| < |acc_x| - „hyst‟
and acc_x - „hyst‟’ ≥ 0
|acc_y| < |acc_x| - „hyst‟
and acc_x + „hyst‟ < 0
|acc_y| ≥ |acc_x| + „hyst‟
and acc_y < 0
|acc_y| ≥ |acc_x| + „hyst‟
and acc_y ≥ 0
Table 19: Meaning of the (0x0C) orient bits in high-asymmetrical mode
(0x0C)
orient
x00
Name
Angle
Condition
portrait upright
297° < j < 63°
x01
portrait upside down
117° < j < 243°
x10
landscape left
63° < j < 117°
x11
landscape right
243° < j < 297°
|acc_y| < 2∙|acc_x| - „hyst‟
and acc_x - „hyst‟ ≥ 0
|acc_y| < 2∙|acc_x| - „hyst‟
and acc_x + „hyst‟ < 0
|acc_y| ≥ 2∙|acc_x| + „hyst‟
and acc_y < 0
|acc_y| ≥ 2∙|acc_x| + „hyst‟
and acc_y ≥ 0
Table 20: Meaning of the (0x0C) orient bits in low-asymmetrical mode
(0x0C)
orient
x00
Name
Angle
Condition
portrait upright
333° < j < 27°
x01
portrait upside down
153° < j < 207°
x10
landscape left
27° < j < 153°
x11
landscape right
207° < j < 333°
|acc_y| < 0.5∙|acc_x| - „hyst‟
and acc_x - „hyst‟ ≥ 0
|acc_y| < 0.5∙|acc_x| - „hyst‟
and acc_x + „hyst‟ < 0
|acc_y| ≥ 0.5∙|acc_x| + „hyst‟
and acc_y < 0
|acc_y| ≥ 0.5∙|acc_x| + „hyst‟
and acc_y ≥ 0
In the preceding tables, the parameter „hyst‟ stands for a hysteresis, which can be selected by
setting the (0x0C) orient_hyst bits. 1 LSB of (0x0C) orient_hyst always corresponds to 62.5 mg,
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in 2g-range, 125 mg in 4g-range, 250 mg in 8g-range and 500 mg in 16g-range.. It is important
to note that by using a hysteresis ≠ 0 the actual switching angles become different from the
angles given in the tables since there is an overlap between the different orientations.
The most significant bit of the (0x0C) orient bits (which is displayed as an ´x´ in the above given
tables) contains information about the direction of the z-axis. It is set to ´0´ (´1´) if acc_z ≥ 0
(acc_z < 0).
Figure 9 shows the typical switching conditions between the four different orientations for the
symmetrical mode (i.e. without hysteresis):
portrait
portraitupright
upright
landscape left
portrait
portraitupside
upside
down
landscape
landscaperight
right
portrait upright
2
1.5
1
0.5
0
0
45
90
135
180
225
270
315
360
-0.5
acc_y/acc_x
-1
acc_x/sin(theta)
-1.5
acc_y/sin(theta)
-2
phi
j
Figure 9: Typical orientation switching conditions w/o hysteresis
The orientation interrupt is enabled (disabled) by writing ´1´ (´0´) to bit (0x16) orient_en. The
interrupt is generated if the value of (0x0C) orient has changed. It is automatically cleared after
one stable period of the (0x0C) orient value. The interrupt status is stored in the (0x09)
orient_int bit.
If temporary or latched interrupt mode is used, after the generation of the interrupt the changed
(0x0C) orient value is kept fixed as long as the interrupt persists (e. g. until the latch time
expires or the interrupt is reset). After clearing the interrupt, the (0x0C) orient is only updated
with the next following value change (i.e. with the next occurring interrupt). In order to ensure
the continuous availability of up-to-date orientation data it is therefore optimal to use the nonlatched interrupt. It is strongly advised against using latched interrupt mode or temporary
interrupt mode with latch times above 50 ms for orient recognition.
4.8.7.1 Orientation blocking
The change of the (0x0C) orient value and – as a consequence – the generation of the interrupt
can be blocked according to conditions selected by setting the value of the (0x2C)
orient_blocking bits as described by table 21.
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Table 21: Blocking conditions for orientation recognition
(0x2C)
orient_blocking
00b
01b
10b
11b
Conditions
no blocking
theta blocking
theta blocking
or
acceleration slope in any axis > 0.2 g
value of orient is not stable for at least 100 ms
or
theta blocking
or
acceleration slope in any axis > 0.4 g
The theta blocking is defined by the following inequality:
tan
blocking _ theta
.
8
The parameter blocking_theta of the above given equation stands for the contents of the (0x2D)
orient_theta bits. Hereby it is possible to define a blocking angle between 0° and 44.8°. The
internal blocking algorithm saturates the acceleration values before further processing. As a
consequence, the blocking angles are strictly valid only for a device at rest; they can be
different if the device is moved.
Example:
To get a maximum blocking angle of 19° the parameter blocking_theta is determined in the
following way: (8 * tan(19°) )² = 7.588, therefore, blocking_value = 8dec = 001000b has to be
chosen.
In order to avoid unwanted generation of the orientation interrupt in a nearly flat position (z ~ 0,
sign change due to small movements or noise), a hysteresis of 0.2 g is implemented for the zaxis, i. e. a after a sign change the interrupt is only generated after |z| > 0.2 g.
4.8.8 Flat detection
The flat detection feature gives information about the orientation of the devices´ z-axis relative
to the g-vector, i. e. it recognizes whether the device is in a flat position or not.
The condition for the device to be in the flat position is
tan
Rev. 1.15
parameter _ theta
.
8
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Like blocking_theta, used with orientation recognition, the parameter_theta stands for a userdefined setting. In this case the content of the (0x2E) flat_theta bits. The possible flat angles
also range from 0° to 44.8°. To ensure proper operation, parameter_theta has to be less than or
equal to blocking_theta.
The flat interrupt is enabled (disabled) by writing ´1´ (´0´) to bit (0x16) flat_en. The flat interrupt
is generated if the flat value has changed and the new value is stable for at least the time given
by the (0x2F) flat_hold_time bits. The flat value is stored in the (0x0C) flat bit if the interrupt is
enabled. This value is ´1´ if the device is in the flat position, it is ´0´ otherwise. The content of
the (0x0C) flat bit is changed only if the interrupt is generated. The interrupt is automatically
cleared after one sample period. Its status is stored in the (0x09) flat_int bit. If temporary or
latched interrupt mode is used, after the generation of the interrupt the changed (0x0C) flat
value is kept fixed as long as the interrupt persists (e. g. until the latch time expires or the
interrupt is reset). After clearing the interrupt, the (0x0C) flat value is only updated with the next
following value change (i.e. with the next occurring interrupt).
The meaning of the (0x2F) flat_hold_time bits can be seen from table 22.
Table 22: Meaning of flat_hold_time
(0x2F)
flat_hold_time
00b
01b
10b
11b
Time
0
512 ms
1024 ms
2048 ms
4.8.9 Low-g interrupt
This interrupt is based on the comparison of acceleration data against a low-g threshold, which
is most useful for free-fall detection.
The interrupt is enabled (disabled) by writing ´1´ (´0´) to the (0x17) low_en bit. There are two
modes available, „single‟ mode and „sum‟ mode. In „single‟ mode, the acceleration of each axis
is compared with the threshold; in „sum‟ mode, the sum of absolute values of all accelerations
|acc_x| + |acc_y| + |acc_z| is compared with the threshold. The mode is selected by the
contents of the (0x24) low_mode bit: ´0´ means „single‟ mode, ´1´ means „sum‟ mode.
The low-g threshold is set through the (0x23) low_th register. 1 LSB of (0x23) low_th always
corresponds to an acceleration of 7.81 mg (i.e. increment is independent from g-range setting).
A hysteresis can be selected by setting the (0x24) low_hy bits. 1 LSB of (0x24) low_hy always
corresponds to an acceleration difference of 125 mg in any g-range (as well, increment is
independent from g-range setting).
The low-g interrupt is generated if the absolute values of the acceleration of all axes (´and´
relation, in case of single mode) or their sum (in case of sum mode) are lower than the
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Note: Specifications within this document are subject to change without notice.
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Data sheet
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threshold for at least the time defined by the (0x22) low_dur register. The interrupt is reset if the
absolute value of the acceleration of at least one axis (´or´ relation, in case of single mode) or
the sum of absolute values (in case of sum mode) is higher than the threshold plus the
hysteresis for at least one data acquisition. In bit (0x09) low_int the interrupt status is stored.
The relation between the content of (0x22) low_dur and the actual delay of the interrupt
generation is: delay [ms] = [(0x22) low_dur + 1] • 2 ms. Therefore, possible delay times range
from 2 ms to 512 ms.
4.8.10 High-g interrupt
This interrupt is based on the comparison of acceleration data against a high-g threshold for the
detection of shock or other high-acceleration events.
The high-g interrupt is enabled (disabled) per axis by writing ´1´ (´0´) to bits (0x17) high_en_x,
(0x17) high_en_y, and (0x17) high_en_z, respectively. The high-g threshold is set through the
(0x26) high_th register. The meaning of an LSB of (0x26) high_th depends on the selected grange: it corresponds to 7.81 mg in 2g-range, 15.63 mg in 4g-range, 31.25 mg in 8g-range, and
62.5 mg in 16g-range (i.e. increment depends from g-range setting).
A hysteresis can be selected by setting the (0x24) high_hy bits. Analogously to (0x26) high_th,
the meaning of an LSB of (0x24) high_hy is g-range dependent: it corresponds to an
acceleration difference of 125 mg in 2g-range, 250 mg in 4g-range, 500 mg in 8g-range, and
1000mg in 16g-range (as well, increment depends from g-range setting).
The high-g interrupt is generated if the absolute value of the acceleration of at least one of the
enabled axes (´or´ relation) is higher than the threshold for at least the time defined by the
(0x25) high_dur register. The interrupt is reset if the absolute value of the acceleration of all
enabled axes (´and´ relation) is lower than the threshold minus the hysteresis for at least the
time defined by the (0x25) high_dur register. In bit (0x09) high_int the interrupt status is stored.
The relation between the content of (0x25) high_dur and the actual delay of the interrupt
generation is delay [ms] = [(0x22) low_dur + 1] • 2 ms. Therefore, possible delay times range
from 2 ms to 512 ms.
4.8.10.1 Axis and sign information of high-g interrupt
The axis which triggered the interrupt is indicated by bits (0x0C) high_first_x, (0x0C)
high_first_y, and (0x0C) high_first_z. The bit corresponding to the triggering axis contains a ´1´
while the other bits hold a ´0´. These bits are cleared together with clearing the interrupt status.
The sign of the triggering acceleration is stored in bit (0x0C) high_sign. If (0x0C) high_sign = ´0´
(´1´), the sign is positive (negative).
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Note: Specifications within this document are subject to change without notice.
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Data sheet
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5. Register description
5.1 General remarks
The entire communication with the device is performed by reading from and writing to registers
(exception: dedicated mode, see chapter 4.2.2). Registers have a width of 8 bits; they are
mapped to a common space of 64 addresses from (0x00) up to (0x3F). Within the used range
there are several registers which are either completely or partially marked as „reserved‟. Any
reserved bit is ignored when it is written and no specific value is guaranteed when read. It is
recommended not to use registers at all which are completely marked as „reserved‟. Furthermore it is recommended to mask out (logical and with zero) reserved bits of registers which are
partially marked as reserved.
Registers with addresses from (0x00) up to (0x0E) are read-only. Any attempt to write to these
registers is ignored. There are bits within some registers that connected with an action to be
done and, therefore, are intended for write-only access, e. g. (0x21) reset_int or the entire
(0x14) softreset register. Such bits always give ´0´ when read.
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Data sheet
5.2 Register map
Register Address
Default Value
0x3F
0x3E
0x3D
0x3C
0x3B
0x3A
0x39
0x38
0x37
0x36
0x35
0x34
0x33
0x32
0x31
0x30
0x2F
0x2E
0x2D
0x2C
0x2B
0x2A
0x29
0x28
0x27
0x26
0x25
0x24
0x23
0x22
0x21
0x20
0x1F
0x1E
0x1D
0x1C
0x1B
0x1A
0x19
0x18
0x17
0x16
0x15
0x14
0x13
0x12
0x11
0x10
0x0F
0x0E
0x0D
0x0C
0x0B
0x0A
0x09
0x08
0x07
0x06
0x05
0x04
0x03
0x02
0x01
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x10
0x00
0x00
0x04
0x70
0x01
0x00
0x10
0x08
0x08
0x18
0x0A
0x04
0x00
0x14
0x00
0xC0
0x0F
0x81
0x30
0x09
0x00
0x05
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x1F
0x03
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
n/a
0x03
bit7
bit6
bit5
bit4
offset_target_z
cal_trigger
reserved
offset_reset
bit3
bit2
reserved
reserved
offset_unfilt_z
offset_unfilt_y
offset_unfilt_x
offset_filt_z
offset_filt_y
offset_filt_x
offset_target_y
cal_rdy
reserved
reserved
reserved
reserved
nvm_load
reserved
bit1
bit0
offset_target_x
hp_z_en
hp_y_en
i2c_wdt_en
nvm_rdy
self_test_sign
cut_off
hp_x_en
i2c_wdt_sel
spi3
nvm_prog_trig
nvm_prog_mode
self_test_axis
reserved
reserved
reserved
reserved
reserved
flat_hold_time
reserved
tap_samp
tap_quiet
tap_shock
reserved
flat_theta
orient_theta
orient_blocking
tap_th
orient_hyst
reserved
orient_mode
tap_dur
reserved
reserved
slope_th
reserved
slope_dur
high_th
high_dur
reserved
low_th
low_dur
high_hy
reset_int
low_mode
reserved
low_hy
latch_int
reserved
int2_od
int2_lvl
int1_od
int1_lvl
reserved
int_src_slope
int_src_high
int_src_low
reserved
int2_slope
int2_high
reserved
int1_slope
int1_high
int2_low
int1_data
int1_low
low_en
reserved
high_en_z
slope_en_z
high_en_y
slope_en_y
high_en_x
slope_en_x
reserved
reserved
int_src_data
int_src_tap
int2_orient
int2_s_tap
int2_d_tap
int1_orient
int1_s_tap
int1_d_tap
reserved
orient_en
s_tap_en
data_en
d_tap_en
reserved
reserved
int2_flat
int2_data
int1_flat
reserved
reserved
flat_en
reserved
softreset
reserved
data_high_bw
reserved
suspend
lowpower_en
reserved
reserved
reserved
reserved
sleep_dur
bw
range
reserved
reserved
flat
tap_sign
data_int
flat_int
tap_first_z
orient[2:0]
tap_first_y
orient_int
s_tap_int
high_sign
slope_sign
reserved
d_tap_int
reserved
temp
acc_z
0
acc_y
0
acc_x
0
reserved
Chip ID
tap_first_x
high_first_z
slope_first_z
high_first_y
slope_first_y
high_first_x
slope_first_x
slope_int
high_int
low_int
new_data_z
new_data_y
new_data_x
w/r
write only
read only
reserved
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Note: Specifications within this document are subject to change without notice.
BMA222
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Data sheet
5.3 Chip ID
Register (0x00) Chip ID contains the chip identification number.
Table 23: Chip identification number, register (0x00)
Bit 7
0
Bit 6
0
Bit 5
0
Bit 4
0
Bit 3
0
Bit 2
0
Bit 1
1
Bit 0
1
Register (0x01) is reserved
5.4 Acceleration data
Register (0x02) contains the new data flag for the x-axis.
Table 24: x-axis new data flag, register (0x02)
(0x02) Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Name
new_data_x
Description
(fixed to 0)
(fixed to 0)
(fixed to 0)
(fixed to 0)
(fixed to 0)
(fixed to 0)
(fixed to 0)
New data flag of x-axis
Register (0x03) contains the x-axis acceleration data.
Table 25: x-axis acceleration, register (0x03)
(0x03) Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Rev. 1.15
Name
acc_x_msb
acc_x_msb
acc_x_msb
acc_x_msb
acc_x_msb
acc_x_msb
acc_x_msb
acc_x_msb
Description
Bit 7 of x-axis acceleration data = x MSB
Bit 6 of x-axis acceleration data
Bit 5 of x-axis acceleration data
Bit 4 of x-axis acceleration data
Bit 3 of x-axis acceleration data
Bit 2 of x-axis acceleration data
Bit 1 of x-axis acceleration data
Bit 0 of x-axis acceleration data = x LSB
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Note: Specifications within this document are subject to change without notice.
BMA222
Data sheet
Bosch Sensortec
Register (0x04) contains the new data flag for the y-axis.
Table 26: y-axis new data flag, register (0x04)
(0x04) Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Name
new_data_y
Description
(fixed to 0)
(fixed to 0)
(fixed to 0)
(fixed to 0)
(fixed to 0)
(fixed to 0)
(fixed to 0)
New data flag of y-axis
Register (0x05) contains the acceleration data for the y-axis.
Table 27: y-axis acceleration, register (0x05)
(0x05) Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Name
acc_y_msb
acc_y_msb
acc_y_msb
acc_y_msb
acc_y_msb
acc_y_msb
acc_y_msb
acc_y_msb
Description
Bit 7 of y-axis acceleration data = y MSB
Bit 6 of y-axis acceleration data
Bit 5 of y-axis acceleration data
Bit 4 of y-axis acceleration data
Bit 3 of y-axis acceleration data
Bit 2 of y-axis acceleration data
Bit 1 of y-axis acceleration data
Bit 0 of y-axis acceleration data = y LSB
Register (0x06) contains the new data flag for the z-axis.
Table 28: z-axis new data flag, register (0x06)
(0x06) Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Rev. 1.15
Name
new_data_z
Description
(fixed to 0)
(fixed to 0)
(fixed to 0)
(fixed to 0)
(fixed to 0)
(fixed to 0)
(fixed to 0)
New data flag of z-axis
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
Register (0x07) contains the acceleration data for the z-axis.
Table 29: MSB part of z-axis acceleration, register (0x07)
(0x07) Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Name
acc_z_msb
acc_z_msb
acc_z_msb
acc_z_msb
acc_z_msb
acc_z_msb
acc_z_msb
acc_z_msb
Description
Bit 7 of z-axis acceleration data = z MSB
Bit 6 of z-axis acceleration data
Bit 5 of z-axis acceleration data
Bit 4 of z-axis acceleration data
Bit 3 of z-axis acceleration data
Bit 2 of z-axis acceleration data
Bit 1 of z-axis acceleration data
Bit 0 of z-axis acceleration data = z LSB
5.5 Temperature data
Register (0x08) temp contains temperature data in two‟s complement representation. Center
temperature = 24 °C i.e. (0x08) temp = 00000000b
1 LSB increment of temperature sensor is 0.5 °C (0.9 °F).
Table 30: Temperature data, register (0x08)
Bit 7
Temp
Bit 6
Temp
Bit 5
Temp
Bit 4
Temp
Bit 3
Temp
Bit 2
Temp
Bit 1
Temp
Bit 0
Temp
5.6 Status registers
Register (0x09) contains the states of several interrupts.
Table 31: Interrupt status, register (0x09)
(0x09) Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Rev. 1.15
Name
flat_int
orient_int
s_tap_int
d_tap_int
- reserved slope_int
high_int
low_int
Description
Flat interrupt status
Orientation interrupt status
Single tap interrupt status
Double tap interrupt status
reserved
Slope interrupt status
High-g interrupt status
Low-g interrupt status
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BMA222
Data sheet
Bosch Sensortec
Register (0x0A) contains the status of the new data interrupt.
Table 32: New data status, register (0x0A)
(0x0A) Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Name
data_int
- reserved - reserved - reserved - reserved - reserved - reserved - reserved -
Description
New data interrupt status
reserved
reserved
reserved
reserved
reserved
reserved
reserved
Register (0x0B) contains the sign and triggering axis information for the tap and slope
interrupts. Here tap interrupt comprises both single and double tap interrupt.
Table 33: Tap and slope interrupts status, register (0x0B)
(0x0B) Bit
Bit 7
Name
tap_sign
Bit 6
Bit 5
Bit 4
Bit 3
tap_first_z
tap_first_y
tap_first_x
slope_sign
Bit 2
Bit 1
Bit 0
slope_first_z
slope_first_y
slope_first_x
Description
st
Sign of 1 tap that triggered the interrupt (´0´=positive,
´1´=negative)
´1´ indicates that z-axis is triggering axis of tap interrupt
´1´ indicates that y-axis is triggering axis of tap interrupt
´1´ indicates that x-axis is triggering axis of tap interrupt
Sign of slope that triggered the interrupt (´0´=positive,
´1´=negative)
´1´ indicates that z-axis is triggering axis of slope interrupt
´1´ indicates that y-axis is triggering axis of slope interrupt
´1´ indicates that x-axis is triggering axis of slope interrupt
Register (0x0C) contains the flat and orientation status, and the sign and triggering axis
information for the high-g interrupt. Registers (0x0D) and (0x0E) are reserved.
Table 34: Flat and orientation Status, register (0x0C)
(0x0C) Bit
Bit 7
Bit 6
Name
flat
orient
Bit 5
Bit 4
orient
orient
Bit 3
high_sign
Bit 2
Bit 1
Bit 0
high_first_z
high_first_y
high_first_x
Description
flat detection (´1´ if flat condition is fulfilled, ´0´ otherwise)
orientation value of z-axis (´0´ if upward looking, ´1´ if
downward looking)
orientation value of x-y plane (´00´=portrait upright,
´01´=portrait upside-down, ´10´=landscape left,
´11´=landscape right)
Sign of slope that triggered the interrupt (´0´=positive,
´1´=negative)
´1´ indicates that z-axis is triggering axis of high-g interrupt
´1´ indicates that y-axis is triggering axis of high-g interrupt
´1´ indicates that x-axis is triggering axis of high-g interrupt
Registers (0x0D) and (0x0E) are reserved.
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Note: Specifications within this document are subject to change without notice.
BMA222
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Data sheet
5.7 g-range selection
Register (0x0F) contains the selection of the g-range. Proper settings for (0x0F) range are
´0011b´ (selects ±2g range), ´0101b´ (selects ±4g range), ´1000b´ (selects ±8g range), ´1100b´
(selects ±16g range). All other settings are irregular; if such a setting is used, ±2g range is
selected. Default value of (0x0F) range (after reset) is ´0011b´.
Table 35: g-range, register (0x0F)
Bit 7
reserved
Bit 6
reserved
Bit 5
reserved
Bit 4
reserved
Bit 3
range
Bit 2
range
Bit 1
range
Bit 0
range
5.8 Bandwidths
Register (0x10) contains the selection of the bandwidth for filtered acceleration data. Settings
for (0x10) bw are ´00xxxb´ (bandwidth = 7.81 Hz), ´01000b´ (bandwidth = 7.81 Hz), ´01001b´
(bandwidth = 15.63 Hz), ´01010b´ (bandwidth = 31.25 Hz), ´01011b´ (bandwidth = 62.5 Hz),
´01100b´ (bandwidth = 125 Hz), ´01101b´ (bandwidth = 250 Hz), ´01110b´ (bandwidth = 500
Hz), ´01111b´ (bandwidth = 1000 Hz), ´1xxxxb´ (bandwidth = 1000 Hz). Default value of (0x10)
bw (after reset) is ´11111b´. It is recommended to actively use the range from ´01000b´ to
´01111b´ only in order to be compatible with future products.
Table 36: Bandwidths, register (0x10)
Bit 7
reserved
Bit 6
reserved
Bit 5
reserved
Bit 4
bw
Bit 3
bw
Bit 2
bw
Bit 1
bw
Bit 0
bw
5.9 Power modes
Register (0x11) contains the configuration of the power modes. (0x11) suspend = ´1´ (´0´) sets
(resets) suspend mode; default value of (0x11) suspend is ´0´.
(0x11) lowpower_en = ´1´ (´0´) sets (resets) low-power mode, default value of (0x11)
lowpower_en is ´0´.
The settings for (0x11) sleep_dur are ´0000b´ to ´0101b´ (sleep phase duration = 0.5 ms),
´0110b´ (sleep phase duration = 1 ms), ´0111b´ (sleep phase duration = 2 ms), ´1000b´ (sleep
phase duration = 4 ms), ´1001b´ (sleep phase duration = 6 ms), ´1010b´ (sleep phase duration
= 10 ms), ´1011b´ (sleep phase duration = 25 ms), ´1100b´ (sleep phase duration = 50 ms),
´1101b´ (sleep phase duration = 100 ms), ´1110b´ (sleep phase duration = 500 ms), ´1111b´
(sleep phase duration = 1 s). Default value of (0x11) sleep_dur is ´0000b´.
Table 37: Power modes, register (0x11)
Bit 7
suspend
Rev. 1.15
Bit 6
lowpower
_en
Bit 5
reserved
Bit 4
sleep_
dur
Bit 3
sleep_
dur
Page 41 / not for publishing
Bit 2
sleep_
dur
Bit 1
sleep_
dur
Bit 0
reserved
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
5.10 Special control settings
Register (0x12) is reserved.
Register (0x13) contains settings for the configuration of the acceleration data acquisition.
(0x13) data_high_bw = ´0´ (´1´) selects filtered (unfiltered) acceleration data to be written into
the data registers (0x02) to (0x07). Default value of (0x13) data_high_bw is ´0´.
Table 38: Acceleration data acquisition & data output format, register (0x13)
Bit 7
data_high
_bw
Bit 6
reserved
Bit 5
reserved
Bit 4
reserved
Bit 3
reserved
Bit 2
reserved
Bit 1
reserved
Bit 0
reserved
Register (0x14) is the softreset register. A user-triggered reset (softreset) of the sensor is
performed after writing ´0xB6´ to the softreset register. After that reset all registers return to their
default values. Reading (0x14) softreset returns 0x00.
Register (0x15) is reserved.
5.11 Interrupt settings
Registers (0x16) and (0x17) contain the enable bits for the interrupts. Default value of each
enable bit is ´0´.
Table 39: Interrupt setting, register (0x16)
(0x16) Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Rev. 1.15
Name
flat_en
orient_en
s_tap_en
d_tap_en
- reserved slope_en_z
slope_en_y
slope_en_x
Description
´1´ (´0´) enables (disables) flat interrupt
´1´ (´0´) enables (disables) orientation interrupt
´1´ (´0´) enables (disables) single tap interrupt
´1´ (´0´) enables (disables) double tap interrupt
reserved
´1´ (´0´) enables (disables) slope interrupt for z-axis
´1´ (´0´) enables (disables) slope interrupt for y-axis
´1´ (´0´) enables (disables) slope interrupt for x-axis
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Note: Specifications within this document are subject to change without notice.
BMA222
Data sheet
Bosch Sensortec
Table 40: Interrupt setting, register (0x17)
(0x17) Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Name
- reserved - reserved - reserved data_en
low_en
high_en_z
high_en_y
high_en_x
Description
reserved
reserved
reserved
´1´ (´0´) enables (disables) new data interrupt
´1´ (´0´) enables (disables) low-g interrupt
´1´ (´0´) enables (disables) high-g interrupt for z-axis
´1´ (´0´) enables (disables) high-g interrupt for y-axis
´1´ (´0´) enables (disables) high-g interrupt for x-axis
Register (0x18) is reserved.
Registers (0x19) to (0x1B) contain the mapping of interrupts onto the interrupt pins. Default
value of each mapping bit is ´0´.
Table 41: Interrupt mapping, register (0x19)
(0x19) Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Name
int1_flat
int1_orient
int1_s_tap
int1_d_tap
- reserved int1_slope
int1_high
int1_low
Description
´1´ (´0´) maps (unmaps) flat interrupt to INT1 pin
´1´ (´0´) maps (unmaps) orientation interrupt to INT1 pin
´1´ (´0´) maps (unmaps) single tap interrupt to INT1 pin
´1´ (´0´) maps (unmaps) double tap interrupt to INT1 pin
reserved
´1´ (´0´) maps (unmaps) slope interrupt to INT1 pin
´1´ (´0´) maps (unmaps) high-g interrupt to INT1 pin
´1´ (´0´) maps (unmaps) low-g interrupt to INT1 pin
Table 42: Interrupt mapping, register (0x1A)
(0x1A) Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Rev. 1.15
Name
int2_data
- reserved - reserved - reserved - reserved - reserved - reserved int1_data
Description
´1´ (´0´) maps (unmaps) new data interrupt to INT2 pin
reserved
reserved
reserved
reserved
reserved
reserved
´1´ (´0´) maps (unmaps) new data interrupt to INT1 pin
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Note: Specifications within this document are subject to change without notice.
BMA222
Data sheet
Bosch Sensortec
Table 43: Interrupt mapping, register (0x1B)
(0x1B) Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Name
int2_flat
int2_orient
int2_s_tap
int2_d_tap
- reserved int2_slope
int2_high
int2_low
Description
´1´ (´0´) maps (unmaps) flat interrupt to INT2 pin
´1´ (´0´) maps (unmaps) orientation interrupt to INT2 pin
´1´ (´0´) maps (unmaps) single tap interrupt to INT2 pin
´1´ (´0´) maps (unmaps) double tap interrupt to INT2 pin
reserved
´1´ (´0´) maps (unmaps) slope interrupt to INT2 pin
´1´ (´0´) maps (unmaps) high-g interrupt to INT2 pin
´1´ (´0´) maps (unmaps) low-g interrupt to INT2 pin
Registers (0x1C) and (0x1D) are reserved.
Register (0x1E) contains the data source definition for those interrupts with selectable data
source. Default value of each data source selection bit is ´0´.
Table 44: Interrupt data source definition, register (0x1E)
(0x1E) Bit
Bit 7
Bit 6
Bit 5
Name
- reserved - reserved int_src_data
Bit 4
int_src_tap
Bit 3
Bit 2
Bit 1
Bit 0
- reserved int_src_slope
int_src_high
int_src_low
Description
reserved
reserved
´1´ (´0´) selects unfiltered (filtered) data for the new data
interrupt
´1´ (´0´) selects unfiltered (filtered) data for the single tap and
double tap interrupts
reserved
´1´ (´0´) selects unfiltered (filtered) data for the slope interrupt
´1´ (´0´) selects unfiltered (filtered) data for the high-g interrupt
´1´ (´0´) selects unfiltered (filtered) data for the low-g interrupt
Register (0x1F) is reserved.
Register (0x20) contains the behavioural configuration (electrical behaviour) of the interrupt
pins. Default value of (0x20) int1_od and (0x20) int2_od is ´0´. Default value of (0x20) int1_lvl
and (0x20) int2_lvl is ´1´.
Table 45: Electrical behaviour of interrupt pin, register (0x20)
(0x20) Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Rev. 1.15
Name
- reserved - reserved - reserved - reserved int2_od
int2_lvl
int1_od
int1_lvl
Description
reserved
reserved
reserved
reserved
´0´ selects push-pull, ´1´ selects open drive for INT2 pin
´0´ (´1´) selects active level ´0´ (´1´) for INT2 pin
´0´ selects push-pull, ´1´ selects open drive for INT1
´0´ (´1´) selects active level ´0´ (´1´) for INT1 pin
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
Register (0x21) contains the interrupt reset bit and the interrupt mode selection. Writing ´1´ to
(0x21) reset_int resets any latched interrupt.
The settings for (0x21) latch_int are ´0000b´ (non-latched), ´0001b´ (temporary, 250 ms),
´0010b´ (temporary, 500 ms), ´0011b´ (temporary, 1 s), ´0100b´ (temporary, 2 s), ´0101b´
(temporary, 4 s), ´0110b´ (temporary, 8 s), ´0111b´ (latched), ´1000b´ (non-latched), ´1001b´
(temporary, 500 s), ´1010b´ (temporary, 500 s), ´1011b´ (temporary, 1 ms), ´1100b´
(temporary, 12.5 ms), ´1101b´ (temporary, 25 ms), ´1110b´ (temporary, 50 ms), ´1111b´
(latched).
Default value of (0x21) latch_int is ´0000b´.
Table 46: Interrupt reset bit and interrupt mode selection, register (0x21)
Bit 7
reset_int
Bit 6
reserved
Bit 5
reserved
Bit 4
reserved
Bit 3
latch_
int
Bit 2
latch_
int
Bit 1
latch_
int
Bit 0
latch_
int
Register (0x22) contains the delay time definition for the low-g interrupt. The physical delay
time can be computed from the content of (0x22) low_dur according to:
delay [ms] = [(0x22) low_dur + 1] • 2 ms.
Possible delay times range from 2 ms to 512 ms. Default value of (0x22) low_dur is 0x09,
corresponding to a delay of 20 ms.
Table 47: Delay time definition for the low-g interrupt, register (0x22)
Bit 7
low_
dur
Bit 6
low_
dur
Bit 5
low_
dur
Bit 4
low_
dur
Bit 3
low_
dur
Bit 2
low_
dur
Bit 1
low_
dur
Bit 0
low_
dur
Register (0x23) contains the threshold definition for the low-g interrupt. An LSB of (0x23)
low_th corresponds to an actual acceleration of 7.81 mg. Therefore, the threshold ranges from
0 g to 1.992 g. Default value of (0x23) low_th is 0x30, corresponding to an acceleration of 375
mg.
Table 48: Threshold definition for the low-g interrupt, register (0x23)
Bit 7
low_
th
Bit 6
low_
th
Bit 5
low_
th
Bit 4
low_
th
Bit 3
low_
th
Bit 2
low_
th
Bit 1
low_
th
Bit 0
low_
th
Register (0x24) contains the low-g interrupt mode selection, the low-g interrupt hysteresis
setting, and the high-g interrupt hysteresis setting. Setting (0x24) low_mode to ´0´ (´1´) selects
´single´ mode (´sum´ mode). Default value is ´0´ (´single´ mode).
(0x24) low_hy sets the hysteresis of the low-g interrupt. An LSB of (0x24) low_hy corresponds
to an acceleration difference of 125 mg. Default value of (0x24) low_hy is ´01b´.
Rev. 1.15
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
(0x24) high_hy sets the hysteresis of the high-g interrupt. The meaning of an LSB of (0x24)
high_hy depends on the selected g-range. It corresponds to an acceleration difference of 125
mg in 2g-range, 250 mg in 4g-range, 500 mg in 8g-range, and 1000mg in 16g-range.
Default value of (0x24) high_hy is ´10b´.
Table 49: Threshold definition for the low-g interrupt, register (0x24)
Bit 7
high_
hy
Bit 6
high_
hy
Bit 5
reserved
Bit 4
reserved
Bit 3
reserved
Bit 2
low_
mode
Bit 1
low_
hy
Bit 0
low_
hy
Register (0x25) contains the delay time definition for the high-g interrupt. The physical delay
time can be computed from the content of (0x25) high_dur according to
delay [ms] = [(0x25) high_dur + 1] • 2 ms. Possible delay times range from 2 ms to 512 ms.
Default value of (0x25) high_dur is 0x0F, corresponding to a delay of 32 ms.
Table 50: Delay time definition for the high-g interrupt, register (0x25)
Bit 7
high_
dur
Bit 6
high_
dur
Bit 5
high_
dur
Bit 4
high_
dur
Bit 3
high_
dur
Bit 2
high_
dur
Bit 1
high_
dur
Bit 0
high_
dur
Register (0x26) contains the threshold definition for the high-g interrupt. The meaning of an
LSB of (0x26) high_th depends on the selected g-range. It corresponds to 7.81 mg in 2g-range,
15.63 mg in 4g-range, 31.25 mg in 8g-range, and 62.5 mg in 16g-range.
Default value of (0x26) high_th is 0xC0.
Table 51: Threshold definition for the high-g interrupt, register (0x26)
Bit 7
high_
th
Bit 6
high_
th
Bit 5
high_
th
Bit 4
high_
th
Bit 3
high_
th
Bit 2
high_
th
Bit 1
high_
th
Bit 0
high_
th
Register (0x27) contains the definition of the number of samples to be evaluated for the slope
interrupt (any-motion detection). The number of samples is N = (0x27) slope_dur + 1.
Default value of (0x27) slope_dur is ´00b´.
Table 52: Samples number definition for the slope interrupt, register (0x27)
Bit 7
reserved
Rev. 1.15
Bit 6
reserved
Bit 5
reserved
Bit 4
reserved
Bit 3
reserved
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Bit 2
reserved
Bit 1
slope_
dur
Bit 0
slope_
dur
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Data sheet
Register (0x28) contains the threshold definition for the slope interrupt. An LSB of (0x28)
slope_th corresponds to an LSB of acceleration data. Its meaning therefore depends on the
selected g-range. Default value of (0x28) slope_th is 0x14.
Table 53: Slope threshold for the slope interrupt, register (0x28)
Bit 7
slope_
th
Bit 6
slope_
th
Bit 5
slope_
th
Bit 4
slope_
th
Bit 3
slope_
th
Bit 2
slope_
th
Bit 1
slope_
th
Bit 0
slope_
th
Register (0x29) is reserved.
Register (0x2A) contains the timing definitions for the single tap and double tap interrupts.
(0x2A) tap_quiet = ´0´ (´1´) selects a quiet duration of 30 ms (20 ms). The default value of
(0x2A) tap_quiet is ´0´.
(0x2A) tap_shock = ´0´ (´1´) selects a shock duration of 50 ms (75 ms). The default value of
(0x2A) tap_shock is ´0´.
(0x2A) tap_dur selects the length of the time window for the second shock event (for double tap
detection). The settings for (0x2A) tap_dur are ´000b´ (50 ms), ´001b´ (100 ms), ´010b´ (150
ms), ´011b´ (200 ms), ´100b´ (250 ms), ´101b´ (375 ms), ´110b´ (500 ms), ´111b´ (700 ms). The
default value of (0x2A) tap_dur is ´100b´.
Table 54: Tap Quiet duration and tap shock duration, register (0x2A)
Bit 7
tap_
quiet
Bit 6
tap_
shock
Bit 5
reserved
Bit 4
reserved
Bit 3
reserved
Bit 2
tap_
dur
Bit 1
tap_
dur
Bit 0
tap_
dur
Register (0x2B) contains the definition of the number of samples to be processed after wakeup in low-power mode and the threshold definition for the single and double tap interrupts.
(0x2B) tap_samp selects the number of samples that are processed after wake-up in the lowpower mode. The settings for (0x2B) tap_samp are ´00b´ (2 samples), ´01b´ (4 samples), ´10b´
(8 samples), and ´11b´ (16 samples). Default value of (0x2B) tap_samp is ´00b´.
The meaning of an LSB of (0x2B) tap_th depends on the selected g-range. It corresponds to an
acceleration difference of 62.5mg in 2g-range, 125mg in 4g-range, 250mg in 8g-range, and
500mg in 16g-range. Default value of (0x2B) tap_th is 0x0A.
Table 55: Samples number after wake-up and threshold tap interrupt, register (0x2B)
Bit 7
tap_
samp
Rev. 1.15
Bit 6
tap_
samp
Bit 5
reserved
Bit 4
tap_
th
Bit 3
tap_
th
Bit 2
tap_
th
Page 47 / not for publishing
Bit 1
tap_
th
Bit 0
tap_
th
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BMA222
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Data sheet
Register (0x2C) contains the definition of hysteresis, blocking, and mode for the orientation
interrupt. (0x2C) orient_hyst sets the hysteresis of the orientation interrupt; 1 LSB always
corresponds to 62.5 mg, in any g-range (i.e. increment is independent from g-range setting).
Default value of (0x2C) orient_hyst is ´001b´.
(0x2C) orient_blocking selects the kind of blocking that is used for the generation of the
orientation interrupt. The settings for (0x2C) orient_blocking are ´00b´ (no blocking), ´01b´ (theta
blocking), ´10b´ (theta blocking or slope in any axis > 0.2 g), and ´11b´ (orient value not stable
for at least 100 ms or theta blocking or slope in any axis > 0.4 g). Default value of (0x2C)
orient_blocking is ´10b´.
(0x2C) orient_mode sets the thresholds for switching between the different orientations. The
settings for (0x2C) orient_mode are ´00b´ (symmetrical), ´01b´ (high-asymmetrical), ´10b´ (lowasymmetrical), ´11b´ (symmetrical). Default value of (0x2C) orient_mode is ´00b´.
Table 56: Hysteresis, Blocking for Orientation Interrupt, Register (0x2C)
Bit 7
reserved
Bit 6
orient_
hyst
Bit 5
orient_
hyst
Bit 4
orient_
hyst
Bit 3
orient_
blocking
Bit 2
orient_
blocking
Bit 1
orient_
mode
Bit 0
orient_
mode
Register (0x2D) contains the definition of the theta blocking angle for the orientation interrupt.
(0x2D) orient_theta defines a blocking angle between 0° and 44.8° as described in section
“4.8.1.7 Orientation blocking”. Default value of (0x2D) orient_theta is 0x08.
Table 57: Theta blocking angle, register (0x2D)
Bit 7
reserved
Bit 6
reserved
Bit 5
orient_
theta
Bit 4
orient_
theta
Bit 3
orient_
theta
Bit 2
orient_
theta
Bit 1
orient_
theta
Bit 0
orient_
theta
Register (0x2E) contains the definition of the flat threshold angle for the flat interrupt. (0x2E)
flat_theta defines a blocking angle between 0° and 44.8° as described in section”4.8.8 Flat
detection”. Default value of (0x2E) flat_theta is 0x08.
Table 58: Flat threshold angle, register (0x2E)
Bit 7
reserved
Bit 6
reserved
Bit 5
flat_
theta
Bit 4
flat_
theta
Bit 3
flat_
theta
Bit 2
flat_
theta
Bit 1
flat_
theta
Bit 0
flat_
theta
Register (0x2F) contains the definition of the flat hold time. (0x2F) flat_hold_time defines the
time a new flat value has to be at least stable for before the interrupt is generated. The settings
for (0x2F) flat_hold_time are ´00b´ (0), ´01b´ (512 ms), ´10b´ (1024 ms), ´11b´ (2048 ms).
Default value of (0x2F) flat_hold_time is ´01b´.
Rev. 1.15
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
Table 59: Flat threshold angle, register (0x2F)
Bit 7
reserved
Bit 6
reserved
Bit 5
flat_hold_
time
Bit 4
flat_hold_
time
Bit 3
reserved
Bit 2
reserved
Bit 1
reserved
Bit 0
reserved
Register (0x30) and (0x31) are reserved.
5.12 Self-test
Register (0x32) contains the settings for the activation of the sensor self-test.
(0x32) self_test_sign sets the sign of the electrostatic excitation. The settings for (0x32)
self_test_sign are ´0´ (positive sign) and ´1´ (negative sign). Default value of (0x32)
self_test_sign is ´0´.
(0x32) self_test_axis defines the axis which shall be excited. Only one axis can be excited at
the same time. The settings for (0x32) self_test_axis are ´00b´ (no self-test), ´01´ (x-axis), ´10´
(y-axis), and ´11´ (z-axis). Default value of (0x32) self_test_axis is ´00b´.
Table 60: Sensor self-test, register (0x32)
Bit 7
reserved
Bit 6
reserved
Bit 5
reserved
Bit 4
reserved
Bit 3
reserved
Bit 2
self_test
_sign
Bit 1
self_test
_axis
Bit 0
self_test
_axis
5.13 Non-volatile memory control (EEPROM control)
Register (0x33) contains the control settings for the non-volatile memory (EEPROM). (0x33)
nvm_load is used to perform a user-defined image update. Writing ´1´ (0x33) nvm_load starts
the update procedure. The value ´1´ is kept as long as the update procedure runs, afterwards it
is reset to ´0´.
(0x33) nvm_rdy contains the status of writing the EEPROM. (0x33) nvm_rdy is ´0´ as long as
writing the EEPROM endures, it is ´1´ if currently no write access is performed and, therefore, a
new write access can be initiated.
Writing ´1´to (0x33) nvm_prog_trig triggers writing the EEPROM. The EEPROM can only be
written if it was unlocked before.
Writing ´1´to (0x33) nvm_prog_mode unlocks the EEPROM.
Rev. 1.15
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
Table 61: EEPROM control settings, register (0x33)
Bit 7
reserved
Bit 6
reserved
Bit 5
reserved
Bit 4
reserved
Bit 3
nvm_load
Bit 2
nvm_rdy
Bit 1
nvm_prog
_trig
Bit 0
nvm_prog
_mode
5.14 Interface configuration
Register (0x34) contains the settings for the digital interfaces. Writing ´1´to (0x34) i2c_wdt_en
enables the watchdog at the SDI pin (= SDA for I²C) if I²C is selected. Default value of (0x34)
i2c_wdt_en is ´0´.
(0x34) i2c_wdt_sel selects the I²C data pad watchdog timer period. The settings for (0x34)
i2c_wdt_sel are ´0´ (1 ms) and ´1´ (50 ms). Default value of (0x34) i2c_wdt_sel is ´0´.
(0x34) spi3 selects the SPI mode. The settings for (0x34) spi3 are ´0´ (4-wire SPI) and ´1´ (3wire SPI). Default value of (0x34) spi3 is ´0´.
Table 62: EEPROM control settings, register (0x34)
Bit 7
reserved
Bit 6
reserved
Bit 5
reserved
Bit 4
reserved
Bit 3
reserved
Bit 2
i2c_wdt
_en
Bit 1
i2c_wdt
_sel
Bit 0
spi3
Register (0x35) is reserved.
Rev. 1.15
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
5.15 Offset compensation
Register (0x36) contains settings for the offset compensation in general, for fast offset
compensation, and for slow offset compensation. Writing ´1´to (0x36) offset_reset sets all offset
compensation registers (0x38 to 0x3D) to zero.
Default value of (0x36) offset_reset is ´0´.
(0x36) cal_trigger starts the fast compensation process for the specified axis. The settings for
(0x36) cal_trigger are ´00b´ (no axis selected), ´01b´ (x-axis), ´10b´ (y-axis), ´11b´ (z-axis). A
non-zero value is kept until the fast compensation procedure is finished. Default value of (0x36)
cal_trigger is ´00b´.
(0x36) cal_rdy indicates the state of the fast compensation. (0x36) cal_rdy is ´0´ when (0x36)
cal_trigger has a nonzero value, otherwise (0x36) cal_rdy is ´1´.
Writing ´1´ (´0´) to (0x36) hp_z_en enables (disables) slow offset compensation for the z-axis.
Writing ´1´ (´0´) to (0x36) hp_y_en enables (disables) slow offset compensation for the y-axis.
Writing ´1´ (´0´) to (0x36) hp_x_en enables (disables) slow offset compensation for the x-axis.
Default value for each of (0x36) hp_x_en, (0x36) hp_y_en, and (0x36) hp_x_en is ´0´,
respectively.
Table 63: Offset compensation, fast offset compensation, register (0x36)
Bit 7
offset
_reset
Bit 6
cal_
trigger
Bit 5
cal_
trigger
Bit 4
cal_rdy
Bit 3
reserved
Bit 2
hp_z_en
Bit 1
hp_y_en
Bit 0
hp_x_en
Register (0x37) contains settings for the offset compensation in general, and for slow offset
compensation. (0x37) offset_target_z sets the target value for the offset compensation of the zaxis.
(0x37) offset_target_y sets the target value for the offset compensation of the y-axis.
(0x37) offset_target_x sets the target value for the offset compensation of the x-axis.
The settings for (0x37) offset_target_x, (0x37) offset_target_y, and (0x37) offset_target_z are
´00b´ (0 g), ´01b´ (+1 g), ´10b´ (-1 g), and ´11b´ (0 g). Default value of each of (0x37)
offset_target_x, (0x37) offset_target_y, and (0x37) offset_target_z is ´00b´, respectively.
(0x37) cut_off defines the number of samples for comparison by the slow offset compensation.
The settings for (0x37) cut_off are ´0´ (8 samples) and ´1´ (16 samples). The default value of
(0x37) cut_off is ´0´.
Table 64: Offset compensation, slow offset compensation, register (0x37)
Bit 7
reserved
Rev. 1.15
Bit 6
offset_tar
get_z
Bit 5
offset_tar
get_z
Bit 4
offset_tar
get_y
Bit 3
offset_tar
get_y
Bit 2
offset_tar
get_x
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Bit 1
offset_tar
get_x
Bit 0
cut_off
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
Register (0x38) contains the compensation value for filtered data for the x-axis. The contents
of each of the registers (0x38) to (0x3D) is added to the corresponding acceleration data; it can
be set either automatically by one of the implemented compensation algorithms or manually.
These registers are image registers of registers in the EEPROM; the content of the EEPROM is
copied to them after every reset.
Table 65: Filtered data compensation for the x-axis, register (0x38)
Bit 7
offset_
filt_x
Bit 6
offset_
filt_x
Bit 5
offset_
filt_x
Bit 4
offset_
filt_x
Bit 3
offset_
filt_x
Bit 2
offset_
filt_x
Bit 1
offset_
filt_x
Bit 0
offset_
filt_x
Register (0x39) contains the compensation value for filtered data for the y-axis.
Table 66: Filtered data compensation for the y-axis, register (0x39)
Bit 7
offset_
filt_y
Bit 6
offset_
filt_y
Bit 5
offset_
filt_y
Bit 4
offset_
filt_y
Bit 3
offset_
filt_y
Bit 2
offset_
filt_y
Bit 1
offset_
filt_y
Bit 0
offset_
filt_y
Register (0x3A) contains the compensation value for filtered data for the z-axis.
Table 67: Filtered data compensation for the z-axis, register (0x3A)
Bit 7
offset_
filt_z
Bit 6
offset_
filt_z
Bit 5
offset_
filt_z
Bit 4
offset_
filt_z
Bit 3
offset_
filt_z
Bit 2
offset_
filt_z
Bit 1
offset_
filt_z
Bit 0
offset_
filt_z
Register (0x3B) contains the compensation value for unfiltered data for the x-axis.
Table 68: Unfiltered data compensation for the x-axis, register (0x3B)
Bit 7
offset_
unfilt_x
Bit 6
offset_
unfilt_x
Bit 5
offset_
unfilt_x
Bit 4
offset_
unfilt_x
Bit 3
offset_
unfilt_x
Bit 2
offset_
unfilt_x
Bit 1
offset_
unfilt_x
Bit 0
offset_
unfilt_x
Register (0x3C) contains the compensation value for unfiltered data for the y-axis.
Table 69: Unfiltered data compensation for the x-axis, register (0x3C)
Bit 7
offset_
unfilt_y
Rev. 1.15
Bit 6
offset_
unfilt_y
Bit 5
offset_
unfilt_y
Bit 4
offset_
unfilt_y
Bit 3
offset_
unfilt_y
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Bit 2
offset_
unfilt_y
Bit 1
offset_
unfilt_y
Bit 0
offset_
unfilt_y
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
Register (0x3D) contains the compensation value for unfiltered data for the z-axis.
Table 70: Unfiltered data compensation for the y-axis, register (0x3D)
Bit 7
offset_
unfilt_z
Bit 6
offset_
unfilt_z
Bit 5
offset_
unfilt_z
Bit 4
offset_
unfilt_z
Bit 3
offset_
unfilt_z
Bit 2
offset_
unfilt_z
Bit 1
offset_
unfilt_z
Bit 0
offset_
unfilt_z
Registers (0x3E) and (0x3F) are image registers of registers in the EEPROM. They are not
linked to any sensor-specific functionality.
Rev. 1.15
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
6. Digital interfaces
The BMA222 supports two serial digital interface protocols for communication as a slave with a
host device (when operating in general mode): SPI and I²C. The active interface is selected by
the state of the Pin#11 (PS) „protocol select‟ pin: ´0´ (´1´) selects SPI (I²C). For details see
section 4.2 Operational modes.
By default, SPI operates in the standard 4-wire configuration. It can be re-configured by
software to work in 3-wire mode instead of standard 4-wire mode.
Both interfaces share the same pins. The mapping for each interface is given in the following
table:
Table 71: Mapping of the interface pins
use w/
SPI
use w/
I²C
Pin#
Name
Description
1
SDO
SDO
address
SPI: Data Output (4-wire mode)
I²C: Used to set LSB of I²C address
2
SDx
SDI
SDA
SPI: Data Input (4-wire mode) Data Input / Output (3-wire mode)
I²C: Serial Data
10
CSB
CSB
unused
Chip Select (enable)
12
SCx
SCK
SCL
SPI: Serial Clock
I²C: Serial Clock
The following table shows the electrical specifications of the interface pins:
Table 72: Electrical specification of the interface pins
Parameter
PS Impedance
for Tri-state Detection
Symbol
Condition
Min
RTS
Typ
Max
1
Units
M
CTS
10
pF
PS Impedance
for Non-Tri-state
RNTS
5
k
Pull-up Resistance
Rup
Pull-down Resistance
Input Capacitance
I²C Bus Load
Capacitance (max.
drive capability)
Rev. 1.15
Rdown
Internal Pull-up
Resistance to VDDIO
Internal Pull-down
Resistance to GND
Cin
CI2C_Load
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70
120
190
k
12
20
32
k
5
10
pF
400
pF
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
6.1 Serial peripheral interface (SPI)
The timing specification for SPI of the BMA222 is given in the following table:
Table 73: SPI timing
Parameter
Symbol
Condition
Min
Clock Frequency
fSPI
Max. Load on SDI or
SDO = 25pF
SCK Low Pulse
SCK High Pulse
SDI Setup Time
SDI Hold Time
SDO Output Delay
tSCKL
tSCKH
tSDI_setup
tSDI_hold
tSDO_OD
CSB Setup Time
CSB Hold Time
tCSB_setup
tCSB_hold
Max
Units
10
MHz
30
40
ns
ns
ns
ns
ns
ns
20
20
20
20
Load = 25pF
Load = 250pF,
VDDIO = 2.4V
20
40
ns
ns
The following figure shows the definition of the SPI timings given in table 73:
tCSB_setup
tCSB_hold
CSB
SCK
tSCKL tSCKH
SDI
SDO
tSDI_setup
tSDI_hold
tSDO_OD
Figure 10: SPI timing diagram
The SPI interface of the BMA222 is compatible with two modes, ´00´ and ´11´. The automatic
selection between [CPOL = ´0´ and CPHA = ´0´] and [CPOL = ´1´ and CPHA = ´1´] is done
based on the value of SCK after a falling edge of CSB.
Two configurations of the SPI interface are supported by the BMA222: 4-wire and 3-wire. The
same protocol is used by both configurations. The device operates in 4-wire configuration by
default. It can be switched to 3-wire configuration by writing ´1´ to (0x34) spi3. Pin SDI is used
as the common data pin in 3-wire configuration.
Rev. 1.15
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
For single byte read as well as write operations, 16-bit protocols are used. The BMA222 also
supports multiple-byte read operations.
In SPI 4-wire configuration CSB (chip select low active), SCK (serial clock), SDI (serial data
input), and SDO (serial data output) pins are used. The communication starts when the CSB is
pulled low by the SPI master and stops when CSB is pulled high. SCK is also controlled by SPI
master. SDI and SDO are driven at the falling edge of SCK and should be captured at the rising
edge of SCK.
The basic write operation waveform for 4-wire configuration is depicted in figure 11. During the
entire write cycle SDO remains in high- impedance state.
CSB
SCK
SDI
R/W
AD6
AD5
AD4
AD3
AD2
AD1
SDO
AD0
DI7
DI6
DI5
DI4
DI3
DI2
DI1
DI0
Z
tri-state
Figure 11: 4-wire basic SPI write sequence (mode ´11´)
The basic read operation waveform for 4-wire configuration is depicted in figure 12:
CSB
SCK
SDI
R/W
AD6
AD5
AD4
AD3
AD2
AD1
AD0
SDO
DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0 tri-state
Figure 12: 4-wire basic SPI read sequence (mode ´11´)
Rev. 1.15
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
The data bits are used as follows:
Bit0: Read/Write bit. When 0, the data SDI is written into the chip. When 1, the data SDO from
the chip is read.
Bit1-7: Address AD(6:0).
Bit8-15: when in write mode, these are the data SDI, which will be written into the address.
When in read mode, these are the data SDO, which are read from the address.
Multiple read operations are possible by keeping CSB low and continuing the data transfer.
Only the first register address has to be written. Addresses are automatically incremented after
each read access as long as CSB stays active low.
The principle of multiple read is shown in figure 13:
Control byte
Start
RW
CSB
=
0
1
Register adress (02h)
0
0
0
0
0
1
0
X
Data byte
Data byte
Data byte
Data register - adress 02h
Data register - adress 03h
Data register - adress 04h
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Stop
X
X
CSB
=
1
Figure 13: SPI multiple read
In SPI 3-wire configuration CSB (chip select low active), SCK (serial clock), and SDI (serial
data input and output) pins are used. The communication starts when the CSB is pulled low by
the SPI master and stops when CSB is pulled high. SCK is also controlled by SPI master. SDI
is driven (when used as input of the device) at the falling edge of SCK and should be captured
(when used as the output of the device) at the rising edge of SCK.
The protocol as such is the same in 3-wire configuration as it is in 4-wire configuration. The
basic operation waveform (read or write access) for 3-wire configuration is depicted in figure 14:
CSB
SCK
SDI
RW
AD6
AD5
AD4
AD3
AD2
AD1
AD0
DI7
DI6
DI5
DI4
DI3
DI2
DI1
DI0
Figure 14: 3-wire basic SPI read or write sequence (mode ´11´)
Rev. 1.15
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
6.2 Inter-Integrated Circuit (I²C)
The I²C bus uses SCL (= SCx pin, serial clock) and SDA (= SDx pin, serial data input and
output) signal lines. Both lines are connected to VDDIO externally via pull-up resistors so that they
are pulled high when the bus is free.
The I²C interface of the BMA222 is compatible with the I²C Specification UM10204 Rev. 03 (19
June 2007), available at http://www.nxp.com. The BMA222 supports I²C standard mode and
fast mode, only 7-bit address mode is supported. For VDDIO = 1.2V to 1.8V the guaranteed
voltage output levels are slightly relaxed as described in the Parameter Specification (table 1).
The default I²C address of the device is 0001000b (0x08). It is used if the SDO pin is pulled to
´GND´. The alternative address 0001001b (0x09) is selected by pulling the SDO pin to ´VDDIO´.
The timing specification for I²C of the BMA222 is given in table 74:
Table 74: I²C timings
Parameter
Symbol
Clock Frequency
SCL Low Period
SCL High Period
SDA Setup Time
SDA Hold Time
Setup Time for a
repeated Start Condition
Hold Time for a Start
Condition
Setup Time for a Stop
Condition
Time before a new
Transmission can start
fSCL
tLOW
tHIGH
tSUDAT
tHDDAT
tSUSTA
1.3
0.6
0.1
0.0
0.6
tHDSTA
0.6
tSUSTO
0.6
tBUF
1.3
Rev. 1.15
Condition
Min
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Max
Units
400
kHz
s
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
Figure 15 shows the definition of the I²C timings given in table 74:
SDA
tBUF
tf
tLOW
SCL
tHIGH
tHDSTA
tr
tHDDAT
tSUDAT
SDA
tSUSTA
tSUSTO
Figure 15: I²C timing diagram
The I²C protocol works as follows:
START: Data transmission on the bus begins with a high to low transition on the SDA line while
SCL is held high (start condition (S) indicated by I²C bus master). Once the START signal is
transferred by the master, the bus is considered busy.
STOP: Each data transfer should be terminated by a Stop signal (P) generated by master. The
STOP condition is a low to HIGH transition on SDA line while SCL is held high.
ACK: Each byte of data transferred must be acknowledged. It is indicated by an acknowledge
bit sent by the receiver. The transmitter must release the SDA line (no pull down) during the
acknowledge pulse while the receiver must then pull the SDA line low so that it remains stable
low during the high period of the acknowledge clock cycle.
In the following diagrams these abbreviations are used:
S
P
ACKS
ACKM
NACKM
RW
Start
Stop
Acknowledge by slave
Acknowledge by master
Not acknowledge by master
Read / Write
A START immediately followed by a STOP (without SCK toggling from logic “1” to logic “0”) is
not supported. If such a combination occurs, the STOP is not recognized by the device.
Rev. 1.15
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
I²C write access:
I²C write access can be used to write a data byte in one sequence.
The sequence begins with start condition generated by the master, followed by 7 bits slave
address and a write bit (RW = 0). The slave sends an acknowledge bit (ACK = 0) and releases
the bus. Then the master sends the one byte register address. The slave again acknowledges
the transmission and waits for the 8 bits of data which shall be written to the specified register
address. After the slave acknowledges the data byte, the master generates a stop signal and
terminates the writing protocol.
Example of an I²C write access:
Control byte
Slave Adress
Start
S
0
0
1
1
0
Register adress (0x10)
RW ACKS
0
0
0
Data byte
0
0
0
1
0
0
Data (0x09)
ACKS
0
0
X
X
X
X
X
ACKS Stop
X
X
X
P
Figure 16: I²C write
I²C read access:
I²C read access also can be used to read one or multiple data bytes in one sequence.
A read sequence consists of a one-byte I²C write phase followed by the I²C read phase. The
two parts of the transmission must be separated by a repeated start condition (Sr). The I²C write
phase addresses the slave and sends the register address to be read. After slave
acknowledges the transmission, the master generates again a start condition and sends the
slave address together with a read bit (RW = 1). Then the master releases the bus and waits for
the data bytes to be read out from slave. After each data byte the master has to generate an
acknowledge bit (ACK = 0) to enable further data transfer. A NACKM (ACK = 1) from the
master stops the data being transferred from the slave. The slave releases the bus so that the
master can generate a STOP condition and terminate the transmission.
The register address is automatically incremented and, therefore, more than one byte can be
sequentially read out. Once a new data read transmission starts, the start address will be set to
the register address specified in the latest I²C write command. By default the start address is
set at 0x00. In this way repetitive multi-bytes reads from the same starting address are possible.
In order to prevent the I²C slave of the device to lock-up the I²C bus, a watchdog timer (WDT) is
implemented. The WDT observes internal I²C signals and resets the I²C interface if the bus is
locked-up by the BMA222. The activity and the timer period of the WDT can be configured
through the bits (0x34) i2c_wdt_en and (0x34) i2c_wdt_sel.
Writing ´1´ (´0´) to (0x34) i2c_wdt_en activates (de-activates) the WDT. Writing ´0´ (´1´) to
(0x34) i2c_wdt_se selects a timer period of 1 ms (50 ms).
Rev. 1.15
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
Example of an I²C read access:
S
0
0
1
1
0
RW ACKS
0
0
0
dummy
Control byte
Slave Adress
Start
X
Register adress (0x02)
0
0
0
0
0
1
ACKS Stop
P
0
Data byte
Slave Adress
Start
Sr
0
0
1
1
0
Read Data (0x02)
RW ACKS
0
0
1
Data byte
X
X
X
X
X
X
Read Data (0x03)
ACKM
X
X
X
X
X
Data byte
…
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Data byte
Data byte
Read Data (0x07)
X
X
…
X
Read Data (0x05)
ACKM
Read Data (0x06)
X
X
Data byte
Read Data (0x04)
…
X
ACKM
X
ACKM
X
X
X
X
X
X
X
X
ACKM
X
…
X
NACK
X
X
Stop
P
Figure 17: I²C multiple read
Rev. 1.15
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Note: Specifications within this document are subject to change without notice.
BMA222
Bosch Sensortec
Data sheet
7. Pin-out and connection diagram
7.1 Pin-out
Top View
Pads not visible!
Bottom View
Pads visible!
Figure 18: Pin-out top view
Figure 19 Pin-out bottom view
Table 75: Pin description
Pin#
Name
I/O Type
1
SDO
Digital out
2
SDx
Digital I/O
3
VDDIO
Supply
4
5
6
7
NC
INT1
INT2
VDD
-Digital out
Digital out
Supply
8
9
10
11
GNDIO
GND
CSB
PS
Ground
Ground
Digital in
Digital in
12
SCx
Digital in
Rev. 1.15
Description
Serial data output in SPI
Address select in I²C mode
see chapter 6.2
SDA serial data I/O in I²C
SDI serial data input in SPI 4W
SDA serial data I/O in SPI 3W
Digital I/O supply voltage (1.2V
… 3.6V)
Interrupt output 1
Interrupt output 2
Power supply for analog & digital
domain (1.62V … 3.6V)
Ground for I/O
Ground for digital & analog
Chip select for SPI mode
Protocol select (GND = SPI,
VDDIO = I²C, float = µC-less). Pin
must not float unless dedicated
mode is used, see chapter 4.2.2
SCK for SPI serial clock
SCL for I²C serial clock
in SPI 4W
Connect to
In SPI 3W in I²C
SDO
DNC (float)
GND for
default addr.
SDI
SDA
SDA
VDDIO
VDDIO
VDDIO
GND
INT1
INT2
VDD
GND
INT1
INT2
VDD
GND
INT1
INT2
VDD
GND
GND
CSB
GND
GND
GND
CSB
GND
GND
GND
DNC (float)
VDDIO
SCK
SCK
SCL
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BMA222
Data sheet
Bosch Sensortec
7.2 Connection diagram 4-wire SPI
Figure 20: 4-wire SPI connection
Rev. 1.15
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BMA222
Data sheet
Bosch Sensortec
7.3 Connection diagram 3-wire SPI
Figure 21: 3-wire SPI connection
Rev. 1.15
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Note: Specifications within this document are subject to change without notice.
BMA222
Data sheet
Bosch Sensortec
7.4 Connection diagram I2C
Figure 22: I²C connection
Note: the recommended value for C1, C2 is 100 nF.
Rev. 1.15
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Note: Specifications within this document are subject to change without notice.
BMA222
Data sheet
Bosch Sensortec
8. Package
8.1 Outline dimensions
The sensor housing is a standard LGA package. It is compliant with JEDEC Standard MO-229
Type VGGD-3. Its dimensions are the following.
Figure 23: Package outline dimensions
Rev. 1.15
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BMA222
Bosch Sensortec
Data sheet
8.2 Sensing axes orientation
If the sensor is accelerated in the indicated directions, the corresponding channel will deliver a
positive acceleration signal (dynamic acceleration). If the sensor is at rest and the force of
gravity is acting along the indicated directions, the output of the corresponding channel will be
negative (static acceleration).
Example: If the sensor is at rest or at uniform motion in a gravity field according to the figure
given below, the output signals are:
•
•
•
± 0g for the X channel
± 0g for the Y channel
+ 1g for the Z channel
Figure 24: Orientation of sensing axis
The following table lists all corresponding output signals on X, Y, and Z while the sensor is at
rest or at uniform motion in a gravity field under assumption of a ±2g range setting and a top
down gravity vector as shown above.
Table 76: Output signals depending on sensor orientation
upright
upright
Sensor Orientation
(gravity vector )
Output Signal X
0g / 0LSB
1g / 64LSB
0g / 0LSB
-1g / -64LSB
0g / 0LSB
0g / 0LSB
Output Signal Y
-1g / -64LSB
0g / 0LSB
+1g / 64LSB
0g / 0LSB
0g / 0LSB
0g / 0LSB
Output Signal Z
0g / 0LSB
0g / 0LSB
0g / 0LSB
0g / 0LSB
1g / 64LSB
-1g / -64LSB
Rev. 1.15
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31 - May - 2012
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as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
BMA222
Data sheet
Bosch Sensortec
8.3 Landing pattern recommendation
For the design of the landing patterns, we recommend the following dimensioning:
Figure 25: Landing patterns relative to the device pins, dimensions are in mm
Rev. 1.15
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© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such
as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
BMA222
Data sheet
Bosch Sensortec
8.4 Marking
8.4.1 Mass production samples
Table 77: Marking of mass production samples
Labeling
CCC
TL
Name
Symbol
Remark
Lot counter
CCC
3 alphanumeric digits, variable
to generate mass production trace-code
Product number
T
1 alphanumeric digit, fixed
to identify product type, T = “7”
Sub-con ID
L
1 alphanumeric digit, variable
to identify sub-con (L = “A” or L = “U” or L = “P”)
Pin 1 identifier
•
--
Name
Symbol
Remark
Eng. sample ID
N
1 alphanumeric digit, fixed
to identify engineering sample, N = “e”
Sample ID
XX
2 alphanumeric digits, variable
to generate trace-code
Counter ID
CC
2 alphanumeric digits, variable
to generate trace-code
Pin 1 identifier
•
--
8.4.2 Engineering samples
Table 78: Marking of engineering samples
Labeling
XXN
CC
Rev. 1.15
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© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such
as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
BMA222
Data sheet
Bosch Sensortec
8.5 Soldering guidelines
The moisture sensitivity level of the BMA222 sensors corresponds to JEDEC Level 1, see also
-
IPC/JEDEC J-STD-020C
"Joint Industry Standard: Moisture/Reflow
Classification for non-hermetic Solid State Surface Mount Devices"
Sensitivity
-
IPC/JEDEC J-STD-033A "Joint Industry Standard: Handling, Packing, Shipping and Use of
Moisture/Reflow Sensitive Surface Mount Devices".
The sensor fulfils the lead-free soldering requirements of the above-mentioned IPC/JEDEC
standard, i.e. reflow soldering with a peak temperature up to 260°C.
Figure 26: Soldering profile
Rev. 1.15
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as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
BMA222
Data sheet
Bosch Sensortec
8.6 Handling instructions
Micromechanical sensors are designed to sense acceleration with high accuracy even at low
amplitudes and contain highly sensitive structures inside the sensor element. The MEMS
sensor can tolerate mechanical shocks up to several thousand g's. However, these limits might
be exceeded in conditions with extreme shock loads such as e.g. hammer blow on or next to
the sensor, dropping of the sensor onto hard surfaces etc.
We recommend to avoid g-forces beyond the specified limits during transport, handling and
mounting of the sensors in a defined and qualified installation process.
This device has built-in protections against high electrostatic discharges or electric fields (e.g.
2kV HBM); however, anti-static precautions should be taken as for any other CMOS
component. Unless otherwise specified, proper operation can only occur when all terminal
voltages are kept within the supply voltage range. Unused inputs must always be tied to a
defined logic voltage level.
8.7 Tape and reel specification
The BMA222 is shipped in a standard cardboard box.
The box dimension for 1 reel is: L x W x H = 35cm x 35cm x 6cm
BMA222 quantity: 10,000pcs per reel, please handle with care.
Figure 27: Tape and reel dimensions in mm
Rev. 1.15
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31 - May - 2012
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such
as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
BMA222
Data sheet
Bosch Sensortec
8.7.1 Orientation within the reel
Processing direction
Figure 28: Orientation of the BMA222 devices relative to the tape
8.8 Environmental safety
The BMA222 sensor meets the requirements of the EC restriction of hazardous substances
(RoHS) directive, see also:
Directive 2002/95/EC of the European Parliament and of the Council of 27 January 2003
on the restriction of the use of certain hazardous substances in electrical and electronic
equipment.
8.8.1 Halogen content
Results of chemical analysis indicate that the BMA222 contains less than 900ppm (by weight)
of Fluorine, Chlorine, Iodine and Bromine (i.e. < 50ppm per each substance). Therefore the
BMA222 can be regarded as halogen-free. For more details on the analysis results please
contact your Bosch Sensortec representative.
8.8.2 Internal package structure
Within the scope of Bosch Sensortec‟s ambition to improve its products and secure the mass
product supply, Bosch Sensortec qualifies additional sources (e.g. 2nd source) for the LGA
package of the BMA222.
While Bosch Sensortec took care that all of the technical packages parameters are described
above are 100% identical for all sources, there can be differences in the chemical content and
the internal structural between the different package sources.
However, as secured by the extensive product qualification process of Bosch Sensortec, this
has no impact to the usage or to the quality of the BMA222 product.
Rev. 1.15
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31 - May - 2012
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such
as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
BMA222
Data sheet
Bosch Sensortec
9. Legal disclaimer
9.1 Engineering samples
Engineering Samples are marked with “e”. Samples may vary from the valid technical
specifications of the product series contained in this data sheet. They are therefore not intended
or fit for resale to third parties or for use in end products. Their sole purpose is internal client
testing. The testing of an engineering sample may in no way replace the testing of a product
series. Bosch Sensortec assumes no liability for the use of engineering samples. The
Purchaser shall indemnify Bosch Sensortec from all claims arising from the use of engineering
samples.
9.2 Product use
Bosch Sensortec products are developed for the consumer goods industry. They may only be
used within the parameters of this product data sheet. They are not fit for use in life-sustaining
or security sensitive systems. Security sensitive systems are those for which a malfunction is
expected to lead to bodily harm or significant property damage. In addition, they are not fit for
use in products which interact with motor vehicle systems.
The resale and/or use of products are at the purchaser‟s own risk and his own responsibility.
The examination of fitness for the intended use is the sole responsibility of the Purchaser.
The purchaser shall indemnify Bosch Sensortec from all third party claims arising from any
product use not covered by the parameters of this product data sheet or not approved by Bosch
Sensortec and reimburse Bosch Sensortec for all costs in connection with such claims.
The purchaser must monitor the market for the purchased products, particularly with regard to
product safety, and inform Bosch Sensortec without delay of all security relevant incidents.
9.3 Application examples and hints
With respect to any examples or hints given herein, any typical values stated herein and/or any
information regarding the application of the device, Bosch Sensortec hereby disclaims any and
all warranties and liabilities of any kind, including without limitation warranties of noninfringement of intellectual property rights or copyrights of any third party. The information given
in this document shall in no event be regarded as a guarantee of conditions or characteristics.
They are provided for illustrative purposes only and no evaluation regarding infringement of
intellectual property rights or copyrights or regarding functionality, performance or error has
been made.
Rev. 1.15
Page 73 / not for publishing
31 - May - 2012
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such
as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
BMA222
Data sheet
Bosch Sensortec
10. Document history and modification
Revision
0.8
0.9
1.0
1.05
1.10
1.15
Chapter
Description of modification/changes
Date
1
4.2.2
4.3
4.4.1
4.6
5.2
4.8.3
5.11
5.11
5.2
4.8.5
4.8.7
6.2
8.2
Document release
Update table 1
Added missing table numbers
Update table 7
Update
Update
Update register map (reg. addr. 0x08h)
Typo correction, int1_od and int2_od
Typo correction, register 0x25
Typo correction in table 53 description
Typo correction register map
Update any-motion (slope) detection
Update orientation interrupt
Update I2C address selection
Update sensing axes orientation
17 December 2010
26 January 2011
07 March 2011
20 June 2011
02 November 2011
31 May 2012
Bosch Sensortec GmbH
Gerhard-Kindler-Strasse 8
72770 Reutlingen / Germany
contact@bosch-sensortec.com
www.bosch-sensortec.com
Modifications reserved | Printed in Germany
Specifications subject to change without notice
Document number: BST-BMA222-DS002-05
Version_1.15_052012
Rev. 1.15
Page 74 / not for publishing
31 - May - 2012
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such
as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
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