Si7210 I2C Hall Effect Magnetic Position
and Temperature Sensor Data Sheet
The Si7210 family of Hall effect magnetic sensors from Silicon Labs combines a chopper-stabilized Hall element with a low-noise analog amplifier, 13-bit analog-to-digital
converter, and an I2C interface. Leveraging Silicon Labs' proven CMOS design techniques, the Si7210 family incorporates digital signal processing to provide precise compensation for temperature and offset drift.
Compared with existing Hall effect sensors, the Si7210 family offers industry-leading
sensitivity, which enables use with larger air gaps and smaller magnets. The integrated
13-bit high-precision ADC delivers high output linearity with very low noise for the highest measurement accuracy. For battery-powered applications, the Si7210 family offers
very low power consumption to improve operating life.
The Si7210 family supports a bidirectional I2C interface which provides full configurability of the Hall effect sensor operate and release points. At any time, the 13-bit magnetic
field strength can be read through the I2C interface.
Applications
FEATURES
• High-Sensitivity Hall Effect Sensor
• Adjustable Full Scale (Standard
Offerings are ±20mT and ±200 mT Full
Scale)
• Integrated Digital Signal Processing for
Temperature and Offset Drift
Compensation
• High-Precision 13-bit Signal Path
• Output Bandwidth up to 20 kHz
• Sensitivity Drift < ±5% over 0-70 °C
• Digital I2C Interface
• Four Selectable I2C Addresses
• Optional Digital Alert Output
• Mechanical position sensing in consum- • Speed sensing
• Utility meters
er, industrial applications
• Control knobs and selector switches
• Replacement of reed switches
• Fluid level measurement
• Wide 1.7 to 5.5 V Power Supply Voltage
• Temperature Sensor Data also available
by I2C (accuracy ±1°C)
• Low 50 nA Sleep Mode Current
Consumption
• Industry-Standard Packaging
• Surface-Mount SOT23-5
• 1.4 x 1.6 mm 8-pin DFN package
Hall Element
Si7210
SCL
ADC
Reg
VDD
Temp / Offset /
Mechanical Stress
Compensation
DSP & Control
Logic
SDA
ALERT
GND
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Rev. 1.2
Table of Contents
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3. I2C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4. Register Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1 Field Descriptions . . . . . . . . . . . . .
4.1.1 Chip ID . . . . . . . . . . . . . . .
4.1.2 Fields Associated with Reading DATA . . . .
4.1.3 Fields Associated with Configuring the Output Pin.
4.1.4 Registers Associated with Control of Idle Time . .
4.1.5 Registers Associated with Setting the Output Scale
4.1.6 Registers Associated with Adding Digital Filtering .
4.1.7 Registers to Read OTP Data . . . . . . . .
4.1.8 Control of On-Chip Test Coil . . . . . . . .
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.12
.13
.14
.15
.15
.16
.17
5. Making Temperature Measurements. . . . . . . . . . . . . . . . . . . . . .
18
6. Pin Descriptions
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6.1 SOT-23 Pin Description .
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.19
6.2 DFN Pin Description .
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.20
7. Ordering Information
8. Package Outline
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8.1 SOT23-5 5-Pin Package .
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8.2 TDFN 8-Pin Package .
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.26
9. Land Patterns
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9.1 SOT23-5 5-Pin PCB Land Pattern
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.28
9.2 TDFN 8-Pin PCB Land Pattern
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10. Top Marking
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10.1 SOT23-5 5-Pin Top Marking .
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10.2 TDFN 8-Pin Top Mark .
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.31
11. Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32
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Rev. 1.2 | 2
Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Electrical Specifications
1. Electrical Specifications
Unless otherwise specified, all min/max specifications apply over the recommended operating conditions.
Table 1.1. Recommended Operating Conditions
Parameter
Temp
Grade
Symbol
Power Supply
Temperature
I
Test Condition
Min
Typ
Max
Unit
VDD
1.71
5.5
V
TA
-40
+125
°C
Table 1.2. General Specifications
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Input Voltage High
VIH
SCL, SDA pins
0.7 x VDD
-
-
V
Input Voltage Low
VIL
SCL, SDA pins
-
-
0.3 x VDD
V
Input Voltage Range
VIN
SCL, SDA with respect to ground
0
VDD
V
Input Leakage
IIL
SDA, SCL
1
µA
0.4
V
0.2
V
0.6
V
Output Voltage Low
VOL
< 0.1
SCL, SDA IOL = 3 mA
VDD > 2 V
SCL, SDA IOL = 2 mA
VDD > 1.71 V
SCL, SDA IOL = 6 mA
VDD > 2 V
Current Consumption
IDD
Sleep timer enabled average at
VDD = 3.3 V and 200 msec sleep
time
Sleep mode
VDD = 3.3 V, T = 25 °C
0.4
μA
50
Sleep mode
1000
VDD = 3.3 V, T = 70 °C
Sleep mode
nA
5000
VDD = 5.5 V, T = 125 °C
Conversion in progress:
1.8 V
3.5
4.5
5.0
6
6.8
8.5
Idle mode
360
1000
Conversion time for first measurement in a burst
11
µs
Additional conversions in a burst
8.8
µs
3.3 V
5.0 V
Conversion Time
TCONV
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mA
μA
Rev. 1.2 | 3
Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Electrical Specifications
Parameter
Symbol
Test Condition
Sleep Time
TSLEEP
Factory configurable from 1 to 200
msec ±20%
Idle Time1
TIDLE
slTime = 0x01
Min
Typ
Max
Unit
11.9
13.2
14.5
µs
185
206
227
msec
1
msec
slFast = 1
slTime = 0xFF
slFast = 0
Wake Up Time
TWAKE
Time from VDD > 1.7 V to first
measurement
Note:
1. Part can go to either idle more or sleep mode between conversions. If part is in idle mode with slTime = 0x00 and slFast = 1
conversion are continuous at 8.8 μsec interval.
Table 1.3. Output Pin Specifications
Parameter
Output Voltage Low
Symbol
VOL
Test Condition
Min
Typ
IOL = 3 mA
Max
Unit
0.4
V
0.2
V
0.6
V
1
µA
VDD > 2 V
Output Pin Open Drain or Push
Pull
IOL = 2 mA
VDD > 1.7 V
IOL = 6 mA
VDD > 2 V
Leakage
IOH
Output high
Output Pin Open Drain
Output Voltage High
VOH
VDD – 0.4
V
VDD >2.25 V
Output Pin Push Pull
Slew Rate
IOH = 2 mA
TSLEW
5
%VDD/ns
Digital Output Mode
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Electrical Specifications
Table 1.4. I2C Interface Specification
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
400
kHz
SCL Clock Frequency
fSCL
0
Start Condition Hold Time
tSDH
0.6
µs
LOW Period of SCL
tSKL
1.3
µs
HIGH Period of Clock
tSKH
0.6
µs
tSU;STA
0.6
µs
Data Hold Time
tDH
0
Data Set Up Time
tDS
100
ns
Set Up Time for a STOP Condition
tSPS
0.6
µs
Bus Free Time between STOP and
START
tBUF
1.3
µs
Data Valid Time (SCL Low to Data
Valid)
tVD;DAT
0.9
µs
Data Valid Acknowledge Time
(time from SCL Low to SDA Low)
tVD;ACK
0.9
µs
17
%VDD
Set Up Time for a Repeated Start
Hysteresis
Digital input hysteresis SDA and
SCL
7
tSP
Suppressed Pulse Width1
50
ns
Note:
1. Pulses up to and including 50 nsec will be suppressed.
tSKH
1/fSCL
tSKL
tSP
SCL
tBUF
tSTH
SDA
tDS
D6
D5
tDH
D4
D0
tSPS
R/W
ACK
Start Bit
Stop Bit
tVD : ACK
tSTS
Figure 1.1. I2C Interface Timing
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Electrical Specifications
Table 1.5. Magnetic Sensor
Parameter
Offset (Digital Output Mode)
Symbol
BOFF
Test Condition
Min
Typ
Max
Unit
±250
+450,
-350
µT
±350
±1500
µT
±250
µT
0 - 70°C
5
%
Full temperature range
10
%
20 mT scale SOT23 package
Full temperature and VDD range
20 mT scale DFN8 package
Full temperature and VDD range
0 - 70°C and 1.71 V to 3.6 V
SOT23 package
Gain Accuracy
Temp = 25 °C, 20 mT range, VDD =
5V
RMS Noise1
30
µT rms
Note:
1. For a single conversion. This may be reduced by filtering.
Table 1.6. Temperature Compensation
Parameter
Symbol
Gain Variation with Temperature
Test Condition
Min
Flat Tempco.
Typ
Max
Unit
< +/-0.05
%/°C
Neodymium compensation
-0.12
%/°C
Ceramic compensation
-0.2
%/°C
0 - 70°C
Table 1.7. Average Temperature Measurement Error
Parameter
Symbol
Average Temperature Measurement Error After Gain and Offset
Correction
Test Conditon
SOT23-5
Min
Typ
Max
Unit
±1
±1.5
°C
-10 to +85°C
DFN8
±4
°C
-10 to +85°C
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Electrical Specifications
Table 1.8. Thermal Characteristics
Parameter
Symbol
Test Condition
Value
Unit
Junction to Air Thermal Resistance
θJA
JEDEC 4 layer board no airflow SOT23-5
212.8
°C/W
Junction to Board Thermal Resistance
θJB
JEDEC 4 layer board no airflow SOT23-5
45
°C/W
Junction to Air Thermal Resistance
θJA
JEDEC 4 layer board no airflow DFN8
107.6
°C/W
Junction to Board Thermal Resistance
θJB
JEDEC 4 layer board no airflow DFN8
42.6
°C/W
Junction to Case Thermal Resistance
θJC
JEDEC 4 layer board no airflow DFN8
53.6
°C/W
Table 1.9. Absolute Maximum Ratings
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Ambient Temperature Under Bias
-55
125
°C
Storage Temperature
-65
150
°C
Voltage on I/O Pins
-0.3
VDD+0.3
V
Voltage on VDD with Respect to
Ground
-0.3
6
V
HBM
2
kV
CDM
500
V
ESD Tolerance
Note:
1. Absolute maximum ratings are stress ratings only, operation at or beyond these conditions is not implied and may shorten the life
of the device or alter its performance.
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Functional Description
2. Functional Description
The Si7210 family of parts are I2C programmable Hall effect magnetic position sensors. These parts digitize the component of the magnetic field in the z axis of the device (positive field is defined as pointing into the device from the bottom). The parts are normally used to
detect the presence or absence of a magnet in security systems, as position sensors or for counting revolutions.
In addition to being able to control the conversion process and read the result of magnetic field conversions by I2C, the 5-pin packages
offer an output pin. The output pin can act as an alert (push pull or open collector) which goes high or low when the magnetic field
crosses a threshold. Alternatively the output pin can be configured as an analog output. The output pin configuration is determined by
the type of part ordered (this is not I2C configurable).
The parts are preconfigured for the magnetic field measurement range, sleep time, temperature compensation, tamper threshold, and
digital filtering, and will wake into the preconfigured mode when first powered. The specific configuration, as well as the I2C address
and output type (open collector or push pull), are determined by the part number. Magnetic field trip points are typically configured by
I2C, and the part is allowed to go into its normal sleep and measurement cycle. If the bit Usestore is set to 1, the output pin trip points
are retained in sleep mode. Data other than magnetic field trip points is not retained in sleep mode. If there is not a need to go to full
sleep mode, the other parameters may be configured, and this data will be kept in idle mode.
Following is a list of I2C interface configurable options:
• Measurement range. This is normally set so that after temperature compensation the full scale (15b unsigned) digital output is
±20.47 mT (0.00125 mT/bit) or ±204.7 mT (0.0125 mT/bit). (Note: 1 Gauss = 0.1 mT). For convenience these are referred to as the
20 mT and 200 mT scales.
• Digital filtering. To reduce noise in the output (normally 0.03 mT RMS on the 20 mT scale), digital filtering can be applied. The digital
filtering can be done to a burst of measurements (FIR filter) or can be configured to average measurements in IIR style. The filtering
can be done over a number of samples in powers of 2 (1,2,4,8,…) for up to 212 (4096) samples.
• Time between measurements (or measurement bursts for the case of FIR filtering)
• For lowest power, the part can be configured to sleep between measurements. However, remember some configuration data is
lost in sleep mode.
• For faster measurement rates, the part is configured to idle between samples.
• The part can also be configured to take a single measurement on command.
• The digital output pin (for parts that support this option)
• Threshold at which the digital output will change for increasing field (Bop) and for decreasing field (Brp).
• The direction in which the output pin goes in response to an increase in field
• There is an option to take the magnitude of the field prior to the comparison so that the polarity is not field dependent
• The settings will be retained in sleep mode.
• A “tamper threshold”. This is intended to signal the presence of a strong magnet, which may indicate tampering. In the case of
tamper detection, the output pin will go to its zero field value (which in security systems is normally an indication of door or window open).
• Temperature compensation of the magnetic field response to compensate for the nominal drop in magnetic field output of common
magnets with increasing temperature.
• An on chip coil that generates a large enough field to allow self-test of the sensor
• The coil can be turned on in either polarity
For greater precision in programming the part, a number of calibration data points are stored in memory (OTP).
• The nominal magnetic field output of the on-chip coil normalized to the power supply voltage
• Coefficients to be used for setting gain and temperature compensation
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
I2C Interface
3. I2C Interface
The Si7210 complies with “fast” mode I2C operation and 7 bit addressing at speeds up to 400 kHz. The I2C address is factory programmed to one of 4 values 0x30, 0x31, 0x32, or 0x33 (0110000b through 0110011b).
At power-up the registers are initialized, as will be described in the register definitions, and then they can be read or written in standard
fashion for I2C devices. A special sequence must be used to read OTP data, as will be described.
The host command for writing an I2C register is:
START
Address
W
ACK
register
ACK
data
ACK
STOP
The host command for reading an I2C register is:
START
Address
W
ACK
Register
ACK
Address
Sr
R
Data
NACK*
STOP
*NACK by host
Where:
START is SDA going low with SCL high
Sr is a repeated START
Address is 0x30 up to 0x33
0 indicates a write and 1 indicates a read
ACK is SDA low
Data is the Read or Write data
NACK is SDA high
STOP is SDA going high with SCL high
Writing or Reading of sequential registers can be supported by setting the arautoinc bit of register 0xC5 (see register description). In
the case of a read sequence where the arautoinc bit has been set, the data can be ACK’d to allow reading of sequential registers. For
example, a two byte read of the conversion data in registers 0xC1 and 0XC2 would be:
START
Address
W
ACK
0xC1
ACK
Address
Sr
ACK
data
ACK*
data
NACK*
STOP
* ACK or NACK by host
To wake a part from sleep mode or to interrupt a measurement loop from idle mode, send the sequence:
START
Address
W
ACK
STOP
In this case, if the host continued with a register, the Si7210 would NACK which would be unexpected.
or use:
START
Address
R
ACK
data
NACK*
STOP
*NACK by host
In this case the Si7210 will produce 0xFF for the data.
Allow 10 μsec between the ACK of the address and the next START for the Si7210 to wake from sleep. In most cases this will happen
automatically due to the 400 kHz maximum speed of the I2C bus.
The sequence will put the part in idle mode with the stop bit set.
Note: It is recommended that the part be put in stop mode prior to changing data that will affect a measurement outcome.
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
I2C Interface
To make a single conversion having woken the part, set the oneburst bit of register 0xC4 to 1 and the stop bit to 0. The stop bit resets
to 1 by the time the measurement is complete.
To put the part back to sleep after reading the data, set stop bit to 0. The bit slTimeena is normally factory set to 1, so it does not need
to be set. The bit sleep is not set.
To put the part to sleep with no measurements (sleep timer disabled), write the sleep bit to 1 and the stop bit to 0.
If it is desired to re-enable the sleep timer having put the part to sleep with sleeptimer disabled, then wait 500 μsec after setting the
sltimeena bit before putting the part to sleep.
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Register Definitions
4. Register Definitions
The Si7210 has 21 registers in locations 0xC0 – 0xE4.
Configuration data is loaded at start up from OTP data and can be modified by I2C writes.
Note: This data will be reloaded when the part wakes from sleep mode (other than 0xC6 and 0xC7 which are
not reloaded if bit Usestore is set).
ADDR
7
6
0xC0
5
4
3
2
chipid (RO)
Dspsigm
0xC2
Dspsigl
0xC3
dspsigsel
meas(RO)
Usestore
oneburst
stop
0xC5
0xC6
0xC7
0
revid (RO)
0xC1
0xC4
1
sleep
arautoinc
sw_low4field
sw_op
sw_fieldpolsel
sw_hyst
0xC8
slTime
0xC9
sw_tamper
slFast
0xCA
a0
0xCB
a1
0xCC
a2
0xCD
df_burstsize
df_bw
0xCE
a3
0xCF
a4
0xD0
a5
0xE1
otp_addr
0xE2
otp_data
0xE3
0xE4
slTimeena
df_iir
otp_read_e
n
otp_busy(RO)
tm_fg
As can be seen many of the bit fields are not aligned with register boundaries. When writing a particular bit field, it is best to use a read,
modify, write procedure to ensure that other bit fields are not unintentionally changed. That is, read the register, modify the bit field of
interest while keeping other bits the same, and then write the register back. Unspecified bits should not be changed from the factory
configuration.
4.1 Field Descriptions
4.1.1 Chip ID
chipid (RO) – This ID 0x1 for all Si7210 parts.
revid (RO) – This ID 0x4 for revision B.
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Rev. 1.2 | 11
Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Register Definitions
4.1.2 Fields Associated with Reading DATA
Dspsigm – Bits [6:0] are the most significant byte of the last conversion result. The most significant bit is a “fresh” bit indicating the
register has been updated since last read. Reading the Dspsigm register causes the register Dspsigl to be loaded with the least significant byte of the last conversion result.
Dspsigl – The least significant byte of the last conversion result. Read Dspsigm first to align the bytes. The complete 15b unsigned
result is 256*Dspsigm[6:0]+Dspsigl[7:0]. A result of 16384 means zero field. More negative results mean negative field, and more
positive results mean more positive field. With the normal recommended gain settings, the magnetic field data is scaled to 1 LSB =
0.00125 mT (±20.47 mT full scale) or 1 LSB = 0.0125 mT (±204.7 mT full scale)
Magnetic field is calculated from the formula:
B = (256*Dspsigm[6:0]+Dspsigl[7:0] -16384)* (0.00125 or 0.0125)
Note: The data for a0 - a5 in registers 0xC9 through 0xD0 is appropriate for the default averaging which is typically 1 sample (df_burstsize=0). The data in registers 0x21 - 0x44 is appropriate when averaging is turned on (df_burstsize>0). If using the coefficients in 0x21 0x44 (for example, to change the measurement scale) and there is no averaging, then subtract 0.1mT from the calculated B field..
Setting dspsigsel to 0x01 will give the output of an internal temperature sensor. See also 5. Making Temperature Measurements.
meas(RO) – indicates a measurement is in process. In most cases this bit is not needed as the fresh bit of Dspsigm can be used in-
stead.
oneburst – Setting this bit initiates a single conversion. Set stop = 0 when setting oneburst = 1. The oneburst bit will auto clear once
the conversion initiates and the stop bit will be set to 1 when the conversion completes.
stop - Setting this bit causes the control state machine measurement loop to pause after the current measurement burst completes.
Once set, clearing this bit restarts the measurement loop.
sleep - Setting this bit causes the part to enter sleep mode after the current measurement burst completes. Once set, clearing this bit
restarts the measurement loop.
arautoinc – enables auto increment of the I2C register address pointer. This bit is not retained in sleep mode
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Register Definitions
4.1.3 Fields Associated with Configuring the Output Pin
Usestore – Setting this bit causes the current state of OTP registers for the sw_op, sw_hyst, sw_low4field, and sw_fieldpolsel bits
to be saved and restored during the next sleep and wakeup sequence instead of using data read from the OTP.
Note: Allowing a part to enter sleep mode will result in reloading other parameters, such as the filtering data. This bit will also be retained in sleep mode.
sw_low4field - selects logic sense; output is low when the field is strong when the bit is set. Output is high when the field is strong
when the bit is cleared.
sw_op – this 7 bit number sets the center point of the decision point for magnetic field high or low. The actual decision point is the
center point plus or minus the hysteresis.
The 15b data that can be read from I2C is truncated to 13b prior to the logic that makes the decision. The middle of the decision point
relative to full scale (13b signed or +/-4096 counts) is:
threshold = (16 + sw_op 3 : 0 ) × 2sw_op 6:4
threshold = 0, when sw_op = 127
These numbers run from 16 to 3840. On the 20 mT scale each LSB of the 15b number is 0.00125 mT. In 13b representation the LSB is
0.005 mT/bit so the middle of the decision point can be programmed from 0.08 mT to 19.2 mT (16*0.005 to 3840*0.005).
Similarly, on the 200 mT scale, the middle point of the decision threshold can be programmed from 0.8 mT to 192 mT.
The special case of sw_op = 127 is for “latches”. A Hall effect latch is like a Hall effect switch except the decision points are generally
symmetrical around zero. A Hall effect latch is useful for detecting wide range of motion such as a garage door where there are magnets of opposite polarities at the extremes of travel.
sw_fieldpolsel
• 00b: absolute value of the field is taken before comparing to threshold (omnipolar)
• 01b: field is multiplied by -1 before being compared to (positive) threshold (unipolar operating in negative field region)
• 10b: field is multiplied by 1 before being compared to (positive) threshold (unipolar operating in positive field region). Also compatible
with Latch operation.
• 11b: unused
sw_hyst - the formula for switch hysteresis is:
hysteresis = (8 + sw_hyst 2 : 0 ) × 2sw_hyst 5:3
If sw_op = 127, (latch mode) the hysteresis is multiplied by 2
When sw_hyst = 63, the hysteresis is set to zero.
These numbers can range from 8 to 1792 or 16 to 3584 when the sensor is in “latch” mode with sw_op = 127.
On the 20 mT scale this corresponds to ±0.04 mT to ±8.96 mT hysteresis when the part is in switch mode and ±0.08 mT to ±17.92 mT
in latch mode. On the 200 mT scale, these numbers are multiplied by 10.
Note that
Bop = (threshold + hysteresis) ×
0.05mT
0.5mT
, or = (threshold + hysteresis) ×
bit
bit
And
Brp = (threshold − hysteresis) ×
0.05mT
0.5mT
, or = (threshold − hysteresis) ×
bit
bit
So that
Bop − Brp = 2 × hysteresis ×
0.05mT
0.5mT
, or = 2 × hysteresis ×
bit
bit
sw_tamper – For the Si7210 if there is a strong magnetic field and the tamper threshold is exceeded, the output pin will go to the same
value it would have been at if the measured field was zero. For a security application, if someone tried to “fool” the sensor by putting a
strong magnet near it, the output indication would be the same as “door open” or low magnetic field indicting possible tampering.
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Register Definitions
The formula for the tamper threshold is:
tamper = (16 + sw_tamper 3 : 0 ) × 2sw_tamper 5:4 +5
The tamper feature is disabled if sw_tamper = 63
This formula can give numbers ranging from 512 to 7936 (which is greater than the full scale of the part. Generally any setting of switch
tamper(5:4) = 3 (11b) effectively disables the tamper feature as well. With switch tamper = 101111b the tamper threshold is 3968 which
is 96.895 % of full scale. On the 20 mT scale a setting of 000000b (threshold = 512) gives a tamper threshold of 2.65 mT and a setting
of 101111b (threshold = 3968) gives a tamper threshold of 19.84 mT. On the 200 mT scale these numbers are multiplied by 10.
Example:
VOUT
sw_hyst
B
sw_op
sw_tamper
Figure 4.1. Omnipolar Switch with Tamper
4.1.4 Registers Associated with Control of Idle Time
slTime - Controls duration of sleep or IDLE interval.
Note: For the case of sleep between measurements (slTimeena = 1), the sleep time is not user configurable and it is recommended
that this register should not be changed. The register will be reloaded every time a measurement is made when the part wakes from
sleep.
The idle counter duration is
tidle = (32 + slTime 4 : 0 ) ×
28−6×slFast+slTime 7:5
10MHz
For the idle counter, slFast =1 and slTime = 0 overrides to mean actual zero idle time. The AFE runs continuously and a new sample
is taken every 8.8 μsec.
Idle times are variable from 13.2 μsec to 206 msec nominally. Idle times are ±10%.
slFast - When set, causes a reduction in programmed sleep and idle times as in the above equations.
slTimeena – Enables the sleep timer. 0 means the part goes into complete sleep once the sleep bit is set. 1 means the parts will wake
a factory set interval between 1 and 200 msec, make a measurement, set the output pin value and return to sleep.
The sleep time is not user configurable. This is determined by the part number ordered and is factory adjustable in the range of 1 to 20
msec ±20%.
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Register Definitions
4.1.5 Registers Associated with Setting the Output Scale
a0,a1,a2,a3,a4,a5 - These parameters are associated with the trimming of the part and setting the analog measurement range. 6
sets of these parameters are stored in OTP for the 2 standard ranges of ±20 mT and ±200 mT and the 3 standard temperature compensations as in Table 1.6 Temperature Compensation on page 6.
Parts are shipped pre-configured for a given output scale. To change the output scale, copy these 5 numbers from OTP to I2C memory.
(See also section on OTP memory.)
4.1.6 Registers Associated with Adding Digital Filtering
df_burstsize - Rather than taking a single sample, each time the part wakes up, the Si7210 can be configured to take a burst of
measurements. The time required to take one measurement is 11 µsec. Each additional measurement takes 8.8 µsec.
The maximum setting of df_bw is 12. The number of samples to average is 2df_bw. This can be 1,2,4,8,…up to 4096. In FIR mode the
number of samples per burst is controlled by df_bw
In FIR mode the average is the sum of the samples divided by the number of samples.
T
∑
output(T ) =
t=T +1−2
df_bw
sample(t)
2df_bw
df_iir = 0 means the averaging is done FIR style, 1 means the averaging is done IIR style
In IIR mode, the averaging is done using:
output(T ) =
(2df_bw − 1)
2
df_bw
1
× output(T − 1) + df_bw × sample(T )
2
In IIR mode, the number of measurements in a burst is 2^df_burstsize, so this is 1,2,4,8,… up to 128 samples. Normally, in IIR mode
df_burstsize is set to 0, but it is possible to use burst averaging on each sample and IIR averaging of the bursts.
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Register Definitions
4.1.7 Registers to Read OTP Data
The following are used for reading the OTP data:
otp_addr - is the address of the data to read
otp_data - is the data once read
otp_read_en - must be set to 1 to initiate a read; this bit is auto cleared
otp_busy – indicates the OTP is busy. For normal I2C reads, the data will be available by the time the read enable bit is set and the
data is read, so in most cases this bit is not needed.
The table below is the map for OTP memory. Registers 0x04 – 0x0F correspond to the I2C registers and are loaded at power up or
wake from sleep. If the bit Usestore is set, then the first two registers are not reloaded on a wake from sleep.
OTP BYTE
0x04
0x05
7
6
5
4
3
sw_low4field
1
0
slFast
slTimeena
sw_op
sw_fieldpolsel
sw_hyst
0x06
slTime
0x08
sw_tamper
0x09
power up a0
0x0A
power up a1
0x0B
power up a2
0x0C
2
df_burstsize
df_bw
0x0D
power up a3
0x0E
power up a4
0x0F
power up a5
0x14
Base part number dropping the “Si72”, for example 01 for Si7201
0x15
Variant according to data sheet represented in hex., for example, variant 50 is 0x32
0x16 – 0x17
Reserved
0x18 – 0x1B
4 byte serial number
0x1C
Reserved
0x1D
Temperature sensor offset adjustment
0x1E
Temperature sensor gain adjustment
0x20
Reserved
0x21 - 0x26
a0 – a5 for 20 mT scale and no magnet temperature compensation
0x27 - 0x2C
a0 - a5 for 200 mT scale and no magnet temperature compensation
0x2D - 0x32
a0 – a5 for 20 mT scale at 25°C -0.12%/°C magnet temperature compensation (Neodymium)
0x33 - 0x38
a0 – a5 for 200 mT scale at 25°C -0.12%/°C magnet temperature compensation (Neodymium)
0x39 - 0x3E
a0 – a5 for 20 mT scale at 25°C -0.2%/°C magnet temperature compensation (Ceramic)
0x3F - 0x44
a0 – a5 for 200 mT scale at 25°C -0.2%/°C magnet temperature compensation (Ceramic)
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df_iir
Rev. 1.2 | 16
Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Register Definitions
4.1.8 Control of On-Chip Test Coil
tm_fg - Test Field Generator Coil
tm_fg
Current in coil
00b (State 0)
None
01b (State 1)
Positive direction
10b (State 2)
Negative direction
11b (State 3)
None
Avoid transitions between states 1 & 2, due to a possible short term high current spike.
The nominal magnetic field output of the on chip generator varies with coil current. The coil current varies with coil resistance and power supply voltage, so the nominal magnetic field output varies according to
Bout = BperVnom × V DD
BperVnom is 1.16 mT/V
This can be used to calculate the expected magnetic field from the test coil for a given VDD. This is somewhat temperature dependent
so the actual measured field will vary according to the accuracy of the part as well as temperature. Generally, as the coil is turned on
and off the measured variation in field should be within ±25% of expectation based on the calculated field generation.
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Making Temperature Measurements
5. Making Temperature Measurements
Every magnetic field conversion has an associated temperature measurement. During magnetic field measurement cycles, this data is
used for compensating the hall sensor data to keep the desired temperature coefficient of magnetic field measurement.
The temperature data is available by setting the dspsigsel field of register 0xC3 to 0x01.
Once the dspsigsel field is set, the temperature sensor data is read from registers 0xC1 and 0xC2 as 15b unsigned number (see also
4.1.2 Fields Associated with Reading DATA).
The temperature sensor data can be read after one conversion or after a burst of conversions.
Note: The temperature sensor data is not averaged after performing a burst. Only the magnetic field data is averaged.
The data in 0xc1 and 0xc2 is combined into a 12 bit signed number:
value = 32 x Dspigm 6 : 0 + (Dspisigl 7 : 0 > > 3)
Temperature_raw = − 3.83 x 10−6 x value 2 + 0.16094 x value − 279.80
The data read in this way does not have offset and gain correction applied. The offset and gain correction is stored in registers 0x1D
and 0x1E which are read as signed integers.
Offset =
signed_value(0x1D)
16
Gain = 1 +
signed_value(0x1E )
2048
And finally
Temperature = gain x (Temperature_raw) + offset − (0.222 × VDD)
If VDD is not known, then use VDD = 3.3 V.
Typically, the gain and offset terms are calculated only once and then are saved. The temperature measurement circuit has noise and
quantization errors of approximately ±0.3 °C. Adding averaging to the calculated temperature will reduce these errors.
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Pin Descriptions
6. Pin Descriptions
6.1 SOT-23 Pin Description
1
5
2
3
4
SOT-23, 5-Pin
Top View
Figure 6.1. Pin Assignments
Table 6.1. 5-Pin SOT23-5 Package
Pin Name
Pin Number
SDA
1
I2C data
GND
2
Ground
SCL
3
I2C clock
VDD
4
Power +1.7 to +5.5 V
ALERT
5
Digital ouput
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Description
Rev. 1.2 | 19
Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Pin Descriptions
6.2 DFN Pin Description
Figure 6.2. 8-Pin DFN, Top View
Table 6.2. Pin Descriptions
Pin
Name
Type
1
GND
Ground
2
SCL
-
I2C Clock
3
NC
-
No connect
4
SDA
-
I2C Data
5
GND
Ground
Ground
6
Out
Bidirectional
Output
7
NC
-
8
Vdd
Power
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Description
Ground
No connect
Vdd
Rev. 1.2 | 20
Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Ordering Information
7. Ordering Information
Si72
10
B
xx
I
V R
Silicon Labs Magnetic Sensor Family
Output Type
10 = I2C
Revision
Product Feature Set
See Selector Guide for breakdown of feature set
Temperature Grade
I = (-40 to +125)
Package
V = SOT23-5, M2 = DFN8
Tape and Reel (Optional)
Figure 7.1. Si7210 Part Numbering
Table 7.1. Product Selection Guide
Part No.
Default Brp and
Bop
Default Output
Polarity (High
Field)
Default Scale
I2C Address
Package
Other
SOT23-5
Tamper @19.84
mT
Si7210 VDD = 1.7 - 5.5 V, IDD = 0.4 μA typical at VDD = 3.3 V. Temperature rating -40 °C to 125
°C. Digital Filtering = None, Sleep/Idle Time = 200 msec (sleep)
Si7210-B-00IV(R)
Bop = ±1.1 mT
(max)
High (push-pull)
20 mT
0x30
Brp = ±0.2 mT
(min)
|Bop - Brp| = 0.4
mT (typ)
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Ordering Information
Part No.
Si7210-B-01IV(R)
Default Brp and
Bop
Default Output
Polarity (High
Field)
Default Scale
I2C Address
Package
Other
Bop = ±1.1 mT
(max)
Low (open drain)
20 mT
0x30
SOT23-5
Tamper @19.84
mT
Low (push-pull)
20 mT
0x31
SOT23-5
Tamper @19.84
mT
Low (push-pull)
20 mT
0x32
SOT23-5
Low (push-pull)
20 mT
0x33
SOT23-5
Low (push-pull)
200 mT
0x33
SOT23-5
High (push-pull)
20 mT
0x30
DFN8
Tamper @19.84
mT
Low (open-drain)
20 mT
0x30
DFN8
Tamper @19.84
mT
Brp = ±0.2 mT
(min)
|Bop - Brp| = 0.4
mT (typ)
Si7210-B-02IV(R)
Bop = ±1.1 mT
(max)
Brp = ±0.2 mT
(min)
|Bop - Brp| = 0.4
mT (typ)
Si7210-B-03IV(R)
Bop = ±1.1 mT
(max)
Brp = ±0.2 mT
(min)
|Bop - Brp| = 0.4
mT (typ
Si7210-B-04IV(R)
Bop = ±1.1 mT
(max)
Brp = ±0.2 mT
(min)
|Bop - Brp| = 0.4
mT (typ)
Si7210-B-05IV(R)
Bop = ±2.15 mT
(max)
Brp = ±0.35 mT
(min)
|Bop - Brp| = 0.8
mT (typ)
Si7210-B-10IM2(R)
Bop = ±7 mT
(max)
Brp = ±4 mT
(min)
|Bop - Brp| = 1
mT (typ)
Si7210-B-11IM2(R)
Bop = ±7 mT
(max)
Brp = ±4 mT
(min)
|Bop - Brp| = 1
mT (typ)
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Ordering Information
Part No.
Si7210-B-12IM2(R)
Default Brp and
Bop
Default Output
Polarity (High
Field)
Default Scale
I2C Address
Package
Bop = ±7 mT
(max)
Low (push-pull)
20 mT
0x31
DFN8
Low (push-pull)
20 mT
0x32
DFN8
Low (push-pull)
20 mT
0x33
DFN8
Low (push-pull)
200 mT
0x33
DFN8
Other
Brp = ±4 mT
(min)
|Bop - Brp| = 1
mT (typ)
Si7210-B-13IM2(R)
Bop = ±7 mT
(max)
Brp = ±4 mT
(min)
|Bop - Brp| = 1
mT (typ)
Si7210-B-14IM2(R)
Bop = ±7 mT
(max)
Brp = ±4 mT
(min)
|Bop - Brp| = 1
mT (typ)
Si7210-B-15IM2(R)
Bop = ±7 mT
(max)
Brp = ±4 mT
(min)
|Bop - Brp| = 1
mT (typ)
Additional Information
For information on the below specifications for each OPN, refer to the Magnetic Sensors Selector Guide:
• Default B Release Point (Brp)
• Default B Operate Point (Bop)
• Tamper threshold
• Temperature sensor accuracy
Factory configuration options include:
• The I2C address
• The output pin can be open drain or push pull
In sleep mode, the operate and release point setting are saved if the bit Usestore is set. Other parameters for sleep timer operation are
factory configured:
• The tamper indication point
• The sample rate
• Samples per measurement burst (FIR mode only)
• Measurement scale and temperature compensation
Note: North pole of a magnet at the bottom of an SOT23-5 package and top of a DFN 8 package (coming soon) is defined as positive
field.
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Package Outline
8. Package Outline
8.1 SOT23-5 5-Pin Package
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Package Outline
Table 8.1. SOT23-5 5-Pin Package Dimensions
Dimension
Min
Max
A
--
1.25
A1
0.00
0.10
A2
0.85
1.15
b
0.30
0.50
c
0.10
0.20
D
2.90 BSC
E
2.75 BSC
E1
1.60 BSC
e
0.95 BSC
e1
1.90 BSC
L
0.30
L2
θ
0.60
0.25 BSC
0°
8°
aaa
0.15
bbb
0.20
ccc
0.10
ddd
0.20
Note:
1. All dimensions shown are in millimeters (mm) unless otherwise noted.
2. Dimensioning and Tolerancing per ANSI Y14.5M-1994.
3. This drawing conforms to the JEDEC Solid State Outline MO-193, Variation AB.
4. Recommended card reflow profile is per the JEDEC/IPC J-STD-020D specification for Small Body Components.
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Package Outline
8.2 TDFN 8-Pin Package
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Package Outline
Table 8.2. DFN 8-Pin Package Dimensions
Dimension
MIN
NOM
MAX
A
0.32
0.37
0.40
A1
0.00
0.02
0.05
A2
0.27
A3
0.102 REF.
b
0.15
0.20
D
1.40 BSC
E
1.60 BSC
e
0.40 BSC
L
0.30
0.35
K
0.70 REF.
aaa
0.10
bbb
0.07
ccc
0.10
eee
0.05
0.25
0.40
Note:
1. All dimensions shown are in millimeters (mm) unless otherwise noted.
2. Dimensioning and Tolerancing per ANSI Y14.5M-1994.
3. Recommended card reflow profile is per the JEDEC/IPC J-STD-020 specification for Small Body Components.
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Land Patterns
9. Land Patterns
9.1 SOT23-5 5-Pin PCB Land Pattern
Dimension
(mm)
C
2.70
E
0.95
X
1.05
Y
0.60
Note:
General
1. All dimensions shown are in millimeters (mm) unless otherwise noted.
2. Dimensioning and Tolerancing is per the ANSI Y14.5M-1994 specification.
3. This Land Pattern Design is based on the IPC-7351 guidelines.
4. All dimensions shown are at Maximum Material Condition (MMC). Least Material Condition (LMC) is calculated based on a Fabrication Allowance of 0.05 mm.
Card Assembly
1. A No-Clean, Type-3 solder paste is recommended.
2. The recommended card reflow profile is per the JEDEC/IPC J-STD-020D specification for Small Body Components.
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Land Patterns
9.2 TDFN 8-Pin PCB Land Pattern
Dimension
mm
D
1.40
E
1.60
C
1.30
L
0.80
W
0.20
e
0.40
Note:
General
1. All dimensions shown are in millimeters (mm).
2. This Land Pattern Design is based on the IPC-7351 guidelines.
3. All dimensions shown are at Maximum Material Condition (MMC). Least Material Condition (LMC) is calculated based on a Fabrication Allowance of 0.05 mm.
Solder Mask Design
1. All metal pads are to be non-solder mask defined (NSMD). Clearance between the solder mask and the metal pad is to be 60 m
minimum, all the way around the pad.
Stencil Design
1. A stainless steel, laser-cut and electro-polished stencil with trapezoidal walls should be used to assure good solder paste release.
2. The stencil thickness should be 0.125 mm (5 mils).
3. The ratio of stencil aperture to land pad size should be 1:1 for all perimeter pads.
4. A 2x1 array of 0.55 mm square openings on a 0.90 mm pitch should be used for the center ground pad.
Card Assembly
1. A No-Clean, Type-3 solder paste is recommended.
2. The recommended card reflow profile is per the JEDEC/IPC J-STD-020 specification for Small Body Components.
Above notes and stencil design are shared as recommendations only. A customer or user may find it necessary to use different parameters and fine tune their SMT process as required for their application and tooling.
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Top Marking
10. Top Marking
10.1 SOT23-5 5-Pin Top Marking
Note: TTTT is a manufacturing code.
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Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Top Marking
10.2 TDFN 8-Pin Top Mark
Table 10.1. Top Marking Package Details
Mark Method:
Laser
Pin 1 Mark
0.30 mm Diameter (Bottom-Left Corner)
Font Size
0.4 mm Right-justified
Line 1 Mark Format
TTT = Mfg Code
First three characters of the Manufacturing Code from the Assembly Purchase Order form.
Line 2 Mark Format
TT = Mfg Code (Continued)
Last two characters of the Manufacturing Code from the Assembly Purchase Order form.
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Rev. 1.2 | 31
Si7210 I2C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Revision History
11. Revision History
Revision 1.2
November 2019
• Added DFN8 package to specification, feature list, and ordering guide
• Added DFN8 package pin description, package outline, and landing pattern
Revision 1.1
March 2019
• Removed all mention of AEC-Q100 qualification in product description and feature list.
Revision 1.0
April 2018
• Updated power numbers to be consistent with production test limits.
• Moved detailed ordering guide to a separate selection guide.
• Updated detailed description to be clearer and more accurate.
• Added Default Bop, Brp column to Ording Guide.
Revision 0.9
June 30, 2017
• Updated 1. Electrical Specifications.
• Updated 7. Ordering Information.
• Minor typo corrections.
Revision 0.1
February 1, 2016
• Initial release.
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Rev. 1.2 | 32
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Disclaimer
Silicon Labs intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers using or
intending to use the Silicon Labs products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific device, and "Typical"
parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. Silicon Labs reserves the right to make changes without
further notice to the product information, specifications, and descriptions herein, and does not give warranties as to the accuracy or completeness of the included information. Without prior
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