Data sheet
BMP180
Digital pressure sensor
Bosch Sensortec
BMP180 Data sheet
Document revision
2.4
Document release date
27 January 2012
Document number
BST-BMP180-DS000-08
Technical reference code(s)
0 273 300 244
Notes
Data in this document are subject to change without notice. Product
photos and pictures are for illustration purposes only and may differ from
the real product’s appearance.
Data sheet
BMP180
Page 2
BMP180
DIGITAL PRESSURE SENSOR
Key features
Pressure range:
Supply voltage:
300 ... 1100hPa (+9000m ... -500m relating to sea level)
1.8 ... 3.6V (VDD)
1.62V ... 3.6V (VDDIO)
Package:
LGA package with metal lid
Small footprint:
3.6mm x 3.8mm
Super-flat:
0.93mm height
Low power:
5µA at 1 sample / sec. in standard mode
Low noise:
0.06hPa (0.5m) in ultra low power mode
0.02hPa (0.17m) ultra high resolution mode
- Temperature measurement included
- I2C interface
- Fully calibrated
- Pb-free, halogen-free and RoHS compliant,
- MSL 1
Typical applications
Enhancement of GPS navigation (dead-reckoning, slope detection, etc.)
In- and out-door navigation
Leisure and sports
Weather forecast
Vertical velocity indication (rise/sink speed)
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
© 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.
Data sheet
BMP180
Page 3
BMP180 general description
The BMP180 is the function compatible successor of the BMP085, a new generation of high
precision digital pressure sensors for consumer applications.
The ultra-low power, low voltage electronics of the BMP180 is optimized for use in mobile phones,
PDAs, GPS navigation devices and outdoor equipment. With a low altitude noise of merely 0.25m at
fast conversion time, the BMP180 offers superior performance. The I2C interface allows for easy
system integration with a microcontroller.
The BMP180 is based on piezo-resistive technology for EMC robustness, high accuracy and linearity as
well as long term stability.
Robert Bosch is the world market leader for pressure sensors in automotive applications. Based on
the experience of over 400 million pressure sensors in the field, the BMP180 continues a new
generation of micro-machined pressure sensors.
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
© 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.
Data sheet
BMP180
Page 4
Index of Contents
1. ELECTRICAL CHARACTERISTICS ................................................................................................. 6
2. ABSOLUTE MAXIMUM RATINGS.................................................................................................... 8
3. OPERATION ...................................................................................................................................... 9
3.1 GENERAL DESCRIPTION .............................................................................................................. 9
3.2 GENERAL FUNCTION AND APPLICATION SCHEMATICS ..................................................................... 9
3.3 MEASUREMENT OF PRESSURE AND TEMPERATURE ..................................................................... 11
3.3.1 Hardware pressure sampling accuracy modes ................................................................ 12
3.3.2 Software pressure sampling accuracy modes .................................................................. 13
3.4 CALIBRATION COEFFICIENTS...................................................................................................... 13
3.5 CALCULATING PRESSURE AND TEMPERATURE ............................................................................ 14
3.6 CALCULATING ABSOLUTE ALTITUDE............................................................................................ 15
3.7 CALCULATING PRESSURE AT SEA LEVEL ..................................................................................... 17
4. GLOBAL MEMORY MAP ................................................................................................................ 18
5. I2C INTERFACE ............................................................................................................................... 19
5.1 I2C SPECIFICATION.................................................................................................................... 19
5.2 DEVICE AND REGISTER ADDRESS ............................................................................................... 20
5.3 I2C PROTOCOL ......................................................................................................................... 20
5.4 START TEMPERATURE AND PRESSURE MEASUREMENT ................................................................ 21
5.5 READ A/D CONVERSION RESULT OR E2PROM DATA ................................................................... 22
6. PACKAGE ........................................................................................................................................ 23
6.1 PIN CONFIGURATION ................................................................................................................. 23
6.2 OUTLINE DIMENSIONS ............................................................................................................... 24
6.2.1 Bottom view ..................................................................................................................... 24
6.2.2 Top view .......................................................................................................................... 25
6.2.3 Side view ......................................................................................................................... 25
6.3 MOISTURE SENSITIVITY LEVEL AND SOLDERING........................................................................... 26
6.4 ROHS COMPLIANCY .................................................................................................................. 26
6.5 MOUNTING AND ASSEMBLY RECOMMENDATIONS ......................................................................... 26
7. LEGAL DISCLAIMER ...................................................................................................................... 27
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
© 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.
Data sheet
BMP180
Page 5
7.1 ENGINEERING SAMPLES ............................................................................................................ 27
7.2 PRODUCT USE .......................................................................................................................... 27
7.3 APPLICATION EXAMPLES AND HINTS ........................................................................................... 27
8. DOCUMENT HISTORY AND MODIFICATION ............................................................................... 28
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
© 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.
Data sheet
BMP180
Page 6
1. Electrical characteristics
If not stated otherwise, the given values are ±3-Sigma values over temperature/voltage range in the
given operation mode. All values represent the new parts specification; additional solder drift is
shown separately.
Table 1: Operating conditions, output signal and mechanical characteristics
Parameter
Operating temperature
Supply voltage
Symbol
TA
VDD
Condition
Min
operational
-40
+85
full accuracy
0
+65
ripple max. 50mVpp
1.8
2.5
3.6
V
1.62
2.5
3.6
V
VDDIO
Typ
Max
Units
°C
IDDLOW
ultra low power mode
3
µA
IDDSTD
standard mode
5
µA
IDDHR
high resolution mode
7
µA
IDDUHR
Ultra high res. mode
12
µA
IDDAR
Advanced res. mode
32
µA
Peak current
Ipeak
during conversion
650
Standby current
IDDSBM
@ 25°C
0.1
µA
950 . . . 1050 hPa
@ 25 °C
±0.12
hPa
±1.0
m
700 … 900hPa
25 . . . 40 °C
±0.12
hPa
±1.0
m
Supply current
@ 1 sample / sec.
25°C
Relative accuracy
pressure
VDD = 3.3V
Absolute accuracy
pressure
VDD = 3.3V
Resolution of
output data
µA
300 . . . 1100 hPa
0 . . . +65 °C
-4.0
-1.0*
+2.0
hPa
300 . . . 1100 hPa
-20 . . . 0 °C
-6.0
-1.0*
+4.5
hPa
pressure
0.01
hPa
temperature
0.1
°C
Noise in pressure
see table on page 12-13
Absolute accuracy
temperature
VDD = 3.3V
Conversion time
1000
tc_p_low
@ 25 °C
-1.5
±0.5
+1.5
°C
0 . . . +65 °C
-2.0
±1.0
+2.0
°C
3
4.5
ms
ultra low power mode
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
© 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.
Data sheet
BMP180
pressure
Page 7
tc_p_std
standard mode
5
7.5
ms
tc_p_hr
high resolution mode
9
13.5
ms
tc_p_luhr
ultra high res. mode
17
25.5
ms
tc_p_ar
Advanced res. mode
51
76.5
ms
Conversion time
temperature
tC_temp
standard mode
3
4.5
ms
Serial data clock
fSCL
3.4
MHz
+2
hPa
Solder drifts
Minimum solder
height 50µm
Long term stability**
12 months
-0.5
±1.0
hPa
* The typical value is: -1±1
** Long term stability is specified in the full accuracy operating pressure range 0 … 65°C
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
© 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.
Data sheet
BMP180
Page 8
2. Absolute maximum ratings
Table 2: Absolute maximum ratings
Parameter
Condition
Storage temperature
Supply voltage
ESD rating
all pins
Min
Max
Units
-40
+85
°C
-0.3
+4.25
V
±2
kV
10,000
hPa
HBM, R = 1.5kΩ,
C = 100pF
Overpressure
The BMP180 has to be handled as Electrostatic Sensitive Device (ESD).
Figure 1: ESD
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
© 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.
Data sheet
BMP180
Page 9
3. Operation
3.1 General description
The BMP180 is designed to be connected directly to a microcontroller of a mobile device via the I2C
bus. The pressure and temperature data has to be compensated by the calibration data of the
E2PROM of the BMP180.
3.2 General function and application schematics
The BMP180 consists of a piezo-resistive sensor, an analog to digital converter and a control unit
with E2PROM and a serial I2C interface. The BMP180 delivers the uncompensated value of pressure
and temperature. The E2PROM has stored 176 bit of individual calibration data. This is used to
compensate offset, temperature dependence and other parameters of the sensor.
UP = pressure data (16 to 19 bit)
UT = temperature data (16 bit)
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
© 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.
Data sheet
BMP180
Page 10
Note:
2
(1) Pull-up resistors for I C bus, Rp = 2.2kΩ ... 10kΩ, typ. 4.7kΩ
Figure 2: Typical application circuit
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
© 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.
Data sheet
BMP180
Page 11
3.3 Measurement of pressure and temperature
For all calculations presented here an ANSI C code is available from Bosch Sensortec (“BMP180
_API”).
The microcontroller sends a start sequence to start a pressure or temperature measurement. After
converting time, the result value (UP or UT, respectively) can be read via the I2C interface. For
calculating temperature in °C and pressure in hPa, the calibration data has to be used. These
constants can be read out from the BMP180 E2PROM via the I2C interface at software initialization.
The sampling rate can be increased up to 128 samples per second (standard mode) for dynamic
measurement. In this case, it is sufficient to measure the temperature only once per second and to
use this value for all pressure measurements during the same period.
Start
Start temperature
measurement
wait 4.5 ms
Read UT
Start pressure
measurement
wait (depends on mode, see below)
Read UP
Calculate pressure and
temperature in physical
units
Figure 3: Measurement flow BMP180
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
© 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.
Data sheet
BMP180
Page 12
3.3.1 Hardware pressure sampling accuracy modes
By using different modes the optimum compromise between power consumption, speed and
resolution can be selected, see below table.
Table 3: Overview of BMP180 hardware accuracy modes, selected by driver software via the
variable oversampling_setting
Mode
ultra low power
RMS
RMS
noise
noise
typ.
typ.
[hPa]
[m]
3
0.06
0.5
Internal
Conversion time
Avg. current @
Parameter
number of
pressure max.
1 sample/s typ.
oversampling_setting
samples
[ms]
[µA]
1
4.5
0
standard
1
2
7.5
5
0.05
0.4
high resolution
2
4
13.5
7
0.04
0.3
ultra high resolution
3
8
25.5
12
0.03
0.25
For further information on noise characteristics see the relevant application note “Noise in pressure
sensor applications”.
All modes can be performed at higher speeds, e.g. up to 128 times per second for standard mode,
with the current consumption increasing proportionally to the sample rate.
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
© 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.
Data sheet
BMP180
Page 13
3.3.2 Software pressure sampling accuracy modes
For applications where a low noise level is critical, averaging is recommended if the lower bandwidth
is acceptable. Oversampling can be enabled using the software API driver (with OSR = 3).
Table 4: Overview of BMP180 software accuracy mode, selected by driver software via the variable
software_oversampling_setting
Mode
Parameter
oversampling_setting
software_
Conversion
Avg. current
oversampl
time
@1
RMS noise
RMS noise
ing_settin
pressure
sample/s
typ. [hPa]
typ. [m]
g
max. [ms]
typ. [µA]
1
76.5
32
0.02
0.17
Advanced
resolution
3
3.4 Calibration coefficients
The 176 bit E2PROM is partitioned in 11 words of 16 bit each. These contain 11 calibration
coefficients. Every sensor module has individual coefficients. Before the first calculation of
temperature and pressure, the master reads out the E2PROM data.
The data communication can be checked by checking that none of the words has the value 0 or
0xFFFF.
Table 5: Calibration coefficients
BMP180 reg adr
Parameter
MSB
LSB
AC1
0xAA
0xAB
AC2
0xAC
0xAD
AC3
0xAE
0xAF
AC4
0xB0
0xB1
AC5
0xB2
0xB3
AC6
0xB4
0xB5
B1
0xB6
0xB7
B2
0xB8
0xB9
MB
0xBA
0xBB
MC
0xBC
0xBD
MD
0xBE
0xBF
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
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parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
Data sheet
BMP180
Page 14
3.5 Calculating pressure and temperature
The mode (ultra low power, standard, high, ultra high resolution) can be selected by the variable
oversampling_setting (0, 1, 2, 3) in the C code.
Calculation of true temperature and pressure in steps of 1Pa (= 0.01hPa = 0.01mbar) and
temperature in steps of 0.1°C.
The following figure shows the detailed algorithm for pressure and temperature measurement.
This algorithm is available to customers as reference C source code (“BMP180_ API”) from Bosch
Sensortec and via its sales and distribution partners. Please contact your Bosch Sensortec
representative for details.
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
© 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.
Data sheet
BMP180
Page 15
Calculation of pressure and temperature for BMP180
type:
short
short
short
unsigned short
unsigned short
unsigned short
short
short
short
short
short
bmp180_get_ut
27898
long
short (0 .. 3)
BMP180_get_up
23843
long
long
long
long
long
long
long
long
long
long
long
long
long
unsigned long
long
long
long
long
long
long
long
Figure 4: Algorithm for pressure and temperature measurement
3.6 Calculating absolute altitude
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
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parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
Data sheet
BMP180
Page 16
With the measured pressure p and the pressure at sea level p0 e.g. 1013.25hPa, the altitude in
meters can be calculated with the international barometric formula:
p
altitude 44330 * 1 -
p0
1
5.255
9000
8000
7000
6000
5000
4000
3000
2000
1000
0
-1000
11
00
10
00
90
0
80
0
70
0
60
0
50
0
Altitude in standard
atmosphere
40
0
30
0
Altitude above sea level [m]
Thus, a pressure change of ∆p = 1hPa corresponds to 8.43m at sea level.
Barometric pressure [hPa]
Figure 5: Transfer function: Altitude over sea level – Barometric pressure
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
© 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.
Data sheet
BMP180
Page 17
3.7 Calculating pressure at sea level
With the measured pressure p and the absolute altitude the pressure at sea level can be calculated:
p0
p
altitude
1
44330
5.255
Thus, a difference in altitude of ∆altitude = 10m corresponds to 1.2hPa pressure change at sea level.
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
© 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.
Data sheet
BMP180
Page 18
4. Global Memory Map
The memory map below shows all externally accessible data registers which are needed to operate
BMP180. The left columns show the memory addresses. The columns in the middle depict the
content of each register bit. The colors of the bits indicate whether they are read-only, write-only or
read- and writable. The memory is volatile so that the writable content has to be re-written after each
power-on.
Not all register addresses are shown. These registers are reserved for further Bosch factory testing
and trimming.
Register Name
out_xlsb
out_lsb
out_msb
ctrl_meas
soft reset
id
calib21 downto calib0
Register Adress
F8h
F7h
F6h
F4h
E0h
D0h
BFh down to AAh
Registers:
bit7
bit6
bit5
bit4
adc_out_xlsb
oss
Control
registers
Type: read / write
Calibration
registers
read only
bit3
bit2
bit1
bit0
Reset state
0
0
0
00h
00h
80h
00h
00h
55h
n/a
adc_out_lsb
adc_out_msb
sco
measurement control
reset
id
calib21 down to calib0
Data
registers
read only
Fixed
read only
Figure 6: Memory map
Measurement control (register F4h ): Controls measurements. Refer to Figure 6 for usage
details.
Sco (register F4h ): Start of conversion. The value of this bit stays “1” during conversion and is
reset to “0” after conversion is complete (data registers are filled).
Oss (register F4h ): controls the oversampling ratio of the pressure measurement (00b: single,
01b: 2 times, 10b: 4 times, 11b: 8 times).
Soft reset (register E0h): Write only register. If set to 0xB6, will perform the same sequence as
power on reset.
Chip-id (register D0h): This value is fixed to 0x55 and can be used to check whether
communication is functioning.
After conversion, data registers can be read out in any sequence (i.e. MSB first or LSB first). Using a
burst read is not mandatory.
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
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parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
Data sheet
BMP180
Page 19
5. I2C Interface
I2C is a digital two wire interface
Clock frequencies up to 3.4Mbit/sec. (I2C standard, fast and high-speed mode supported)
SCL and SDA needs a pull-up resistor, typ. 4.7kOhm to VDDIO
(one resistor each for all the I2C bus)
The I2C bus is used to control the sensor, to read calibration data from the E2PROM and to read the
measurement data when A/D conversion is finished. SDA (serial data) and SCL (serial clock) have
open-drain outputs.
For detailed I2C-bus specification please refer to:
http://www.nxp.com/acrobat_download/literature/9398/39340011.pdf
5.1 I2C specification
Table 6: Electrical parameters for the I2C interface
Parameter
Symbol
Clock input frequency
fSCL
Input-low level
VIL
Input-high level
VIH
Voltage output low level
@ VDDIO = 1.62V, IOL = 3mA
VOL
SDA and SCL pull-up resistor
Rpull-up
SDA sink current
@ VDDIO = 1.62V, VOL = 0.3V
ISDA_sink
Start-up time after power-up,
before first communication
tStart
Min.
Typ
Max.
Units
3.4
MHz
0
0.2 * VDDIO
V
0.8 * VDDIO
VDDIO
V
0.3
V
10
kOhm
2.2
9
10
mA
Ms
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
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parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
Data sheet
BMP180
Page 20
5.2 Device and register address
The BMP180 module address is shown below. The LSB of the device address distinguishes
between read (1) and write (0) operation, corresponding to address 0xEF (read) and 0xEE (write).
Table 7: BMP180 addresses
A7
1
A6
1
A5
1
A4
0
A3
1
A2
1
A1
1
W/R
0/1
5.3 I2C protocol
The I2C interface protocol has special bus signal conditions. Start (S), stop (P) and binary data
conditions are shown below. At start condition, SCL is high and SDA has a falling edge. Then the
slave address is sent. After the 7 address bits, the direction control bit R/W selects the read or write
operation. When a slave device recognizes that it is being addressed, it should acknowledge by
pulling SDA low in the ninth SCL (ACK) cycle.
At stop condition, SCL is also high, but SDA has a rising edge. Data must be held stable at SDA
when SCL is high. Data can change value at SDA only when SCL is low.
Even though VDDIO can be powered on before VDD, there is a chance of excessive power
consumption (a few mA) if this sequence is used, and the state of the output pins is undefined so
that the bus can be locked. Therefore, VDD must be powered before VDDIO unless the limitations
above are understood and not critical.
Figure 7: I2C protocol
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
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parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
Data sheet
BMP180
Page 21
5.4 Start temperature and pressure measurement
The timing diagrams to start the measurement of the temperature value UT and pressure value UP
are shown below. After start condition the master sends the device address write, the register
address and the control register data. The BMP180 sends an acknowledgement (ACKS) every 8
data bits when data is received. The master sends a stop condition after the last ACKS.
Figure 8: Timing diagram for starting pressure measurement
Abbreviations:
S
P
ACKS
ACKM
NACKM
Start
Stop
Acknowledge by Slave
Acknowledge by Master
Not Acknowledge by Master
Table 8: Control registers values for different internal oversampling_setting (oss)
Measurement
Control register value
(register address 0xF4)
Max. conversion time
[ms]
Temperature
0x2E
4.5
Pressure
(oss = 0)
0x34
4.5
Pressure
(oss = 1)
0x74
7.5
Pressure
(oss = 2)
0xB4
13.5
Pressure
(oss = 3)
0xF4
25.5
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
© 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.
Data sheet
BMP180
Page 22
5.5 Read A/D conversion result or E2PROM data
To read out the temperature data word UT (16 bit), the pressure data word UP (16 to 19 bit) and
the E2PROM data proceed as follows:
After the start condition the master sends the module address write command and register address.
The register address selects the read register:
E2PROM data registers 0xAA to 0xBF
Temperature or pressure value UT or UP 0xF6 (MSB), 0xF7 (LSB), optionally 0xF8 (XLSB)
Then the master sends a restart condition followed by the module address read that will be
acknowledged by the BMP180 (ACKS). The BMP180 sends first the 8 MSB, acknowledged by the
master (ACKM), then the 8 LSB. The master sends a "not acknowledge" (NACKM) and finally a stop
condition.
Optionally for ultra high resolution, the XLSB register with address 0xF8 can be read to extend the
16 bit word to up to 19 bits; refer to the application programming interface (API) software rev. 1.1
(“BMP180_ API”, available from Bosch Sensortec).
SCL
SDA
PR
OM
Module address
write 0xEE
Module address
MSB e.g.
LSB e.g.
read
0xEF
ADC
result 0x96
e.g. 0xF6
ADC result 0x5C
NACKM P
ACKS Restart
ACKS
ACKM
Register address
ACKS
Figure 9: Timing diagram read 16 bit A/D conversion result
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
© 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.
Data sheet
BMP180
Page 23
6. Package
6.1 Pin configuration
Picture shows the device in top view. Device pins are shown here transparently only for orientation
purposes.
1
7
6
2
5
3
4
Figure 10: Layout pin configuration BMP180
Table 9: Pin configuration BMP180
in No
Name
Function
1
CSB*
Chip select
2
VDD
Power supply
3
VDDIO
Digital power supply
4
SDO*
SPI output
5
SCL
I2C serial bus clock input
6
SDA
I2C serial bus data (or SPI input)
7
GND
Ground
* A pin compatible product variant with SPI interface is possible upon customer’s request. For I2C
(standard case) CSB and SDO are not used, they have to be left open.
All pins have to be soldered to the PCB for symmetrical stress input even though they are not
connected internally.
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
© 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.
Data sheet
BMP180
Page 24
6.2 Outline dimensions
The sensor housing is a 7Pin LGA package with metal lid. Its dimensions are 3.60mm (±0.1 mm) x
3.80mm (±0.1 mm) x 0.93mm (±0.07 mm).
Note: All dimensions are in mm.
6.2.1 Bottom view
0,50
0,60
Figure 11: Bottom view BMP180
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
© 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.
Data sheet
BMP180
Page 25
6.2.2 Top view
Figure 12: Top view BMP180
6.2.3 Side view
Figure 13: Side view BMP180
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
© 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.
Data sheet
BMP180
Page 26
6.3 Moisture sensitivity level and soldering
The BMP180 is classified MSL 1 (moisture sensitivity level) according to IPC/JEDEC standards JSTD-020D and J-STD-033A.
The device can be soldered Pb-free with a peak temperature of 260°C for 20 to 40 sec. The
minimum height of the solder after reflow shall be at least 50µm. This is required for good
mechanical decoupling between the sensor device and the printed circuit board (PCB).
To ensure good solder-ability, the devices shall be stored at room temperature (20°C).
The soldering process can lead to an offset shift.
6.4 RoHS compliancy
The BMP180 sensor meets the requirements of the EC directive "Restriction of hazardous
substances (RoHS)", please refer also to:
"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".
The BMP180 sensor is also halogen-free.
6.5 Mounting and assembly recommendations
In order to achieve the specified performance for you design, the following recommendations and the
“Handling, soldering & mounting instructions BMP180” should be taken into consideration when
mounting a pressure sensor on a printed-circuit board (PCB):
The clearance above the metal lid shall be 0.1mm at minimum.
For the device housing appropriate venting needs to be provided in case the ambient
pressure shall be measured.
Liquids shall not come into direct contact with the device.
During operation the sensor is sensitive to light, which can influence the accuracy of the
measurement (photo-current of silicon).
The BMP180 shall not the placed close the fast heating parts. In case of gradients > 3°C/sec.
it is recommended to follow Bosch Sensortec application note ANP015, "Correction of errors
induced by fast temperature changes". Please contact your Bosch Sensortec representative
for details.
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
© 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.
Data sheet
BMP180
Page 27
7. Legal disclaimer
7.1 Engineering samples
Engineering Samples are marked with an asterisk (*) or (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.
7.2 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.
7.3 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 non-infringement 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.
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
© 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.
Data sheet
BMP180
Page 28
8. Document history and modification
Rev. No Chapter Description of modifications/changes
Date
First edition for description of serial production material
1.0
– Preliminary version
1.1
5.1
New nomenclature of pin configuration
27 July 2010
1.2
5
Design change in package – hole in Lid and without slit 13 September 2010
- Standardizing pin naming over Bosch Sensortec
3.2
1.3
products – typical application circuit
15 December 2010
5.1
- Optimizing pin description, SPI description
- Non-preliminary version
2.0
1
28 January 2011
- Verifying parameter through characterization
3.2
- Declaration of SDO and CSB pins in the typical
application circuit
4
- Adding global memory map and bits description
2.1
1 April 2011
5.3
- Power-up sequence
6.1
- Description of used interfaces
6.2.1
- Dimension pin7
2.2
6.1
Correction of the pin configuration (editorial change)
14 April 2011
2.3
3.3
Optimizing noise performance
25 May 2011
6.3
Removed shelf-life constraints
page 2 Comparison removed
2.4
26 January 2012
5.1
Voltage output low level added
5.3
Power on sequence of VDD and VDDIO defined
Bosch Sensortec GmbH
Gerhard-Kindler-Strasse 8
72770 Reutlingen / Germany
contact@bosch-sensortec.com
www.bosch-sensortec.com
Modifications reserved | Printed in Germany
Specifications are subject to change without notice
Revision_2.4_012012
Document number: BST-BMP180-DS000-08
BST-BMP180-DS000-08 | Revision 2.4 | January 2012
Bosch Sensortec
© 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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