BMP085
Digital, barometric pressure sensor
Bosch Sensortec
General description
BMP085 target applications
The BMP085 is a high-precision, ultra-low power
ff GPS navigation enhancement
barometric pressure sensor for use in advanced
ff Dead reckoning
mobile applications.
ff In- and outdoor navigation
ff Leisure, sports and health monitoring
With an absolute accuracy of 2.5hPa and a noise
ff Weather forecast
level of down to 0.03hPa (which is equivalent to an
ff Vertical velocity indication (rise/sink speed)
altitude change of merely 0.25m) the BMP085 offers
ff Fan power control
superior performance. At the same time the BMP085
features ultra low power consumption of down to
3µA. This and the very small, ultra-thin package make
Technical data
the BMP085 the sensor of choice for any mobile
Pressure range
application requiring precise barometric pressure
RMS noise expressed
measurement, like for example mobile phones, PDAs,
in pressure
BMP085
300 ... 1100 hPa
0.06 hPa, typ.
(ultra-low power mode)
0.03 hPa, typ.
personal GPS-based navigation devices and advan-
(ultra-high resolution
ced outdoor equipment.
mode)
The BMP085 sensor is based on piezo-resistive
RMS noise expressed
MEMS technology for EMC robustness, high accu­racy
in altitude
0.5 m, typ.
(ultra-low power mode)
0.25 m, typ.
and linearity as well as long term stability.
(ultra-high resolution
It comes in an ultra-thin, but robust 8-pin ceramic
mode)
lead-less chip carrier (LCC) package. The BMP085 is
designed to be connected directly to a micro-con­
Absolute accuracy
troller of a mobile device via the I2C bus.
p=700 ... 1100hPa
(T=0 ... +65°C, VDDA=3.3V)
The BMP085 is the direct successor of the success­ful
Average current
SMD500 pressure sensor, that marked a new gene-
consumption
ration of high-precision digital pressure sensors for
(1Hz data refresh rate)
consumer applications.
Pressure: ± 2.5 hPa, max.
Temperature: ±2 °C, max.
3 µA, typ.
(ultra-low power mode)
12 µA, typ.
(ultra-high resolution
mode)
Key features BMP085
Peak current
ff Wide barometric pressure range
Stand-by current
ff Flexible supply voltage range
Supply voltage V DDD
ff Ultra-low power consumption
Supply voltage V DDA
ff Low noise measurement
Operation temp. range
ff Fully calibrated
full accuracy
ff Temperature measurement included
Pressure conv. time
ff Digital two-wire I2C interface
I2C data transfer rate
ff Ultra-flat, small footprint ceramic package
Package type / pin no.
ff Pb-free and RoHS compliant
Package dimensions
600 µA, typ.
0.1 µA, typ.
1.62 ... 3.6 V
1.8 ... 3.6 V
-40 ... +85 °C
0 ... +65 °C
7.5 msec, max.
3.4 MHz, max.
LCC / 8
5 mm x 5 mm x 1.2 mm
Bosch Sensortec
2
BMP085
Pin configuration (top view, pads shown transparently)
1.07±0.10
0.13±0.10
(RO.15)
(7x)
(8)
(8x)
(4x)
The BMP085 comes as fully calibrated, ready-touse sensor module without the need for additional
external circuitry. Pressure and temperature data
2
(R.10)
together with calibration data for temperature
compensation.
6
5
3
are provided as 16 bit values via the I2C interface,
1.95±0.10
±0.05
1.27
7
(8x)
0.60±0.05
1
2.54±0.10
P=1.27x2
Sensor operation
The below figure describes the so-called barometric
formula by means of which the absolute altitude can be
calculated from the measured barometric pressure.
4
5.00±0.25
SDA
I2C serial bus data
8
XCLR
Master clear input
0
7
10
I2C serial bus clock input
0
SCL
1.
6
00
Not connected
0
Power supply digital
NC
1.
V DDD
5
0
-1000
90
4
1000
0
Power supply analog
80
V DDA
0
3
2000
70
End of conversion output
0
EOC
60
2
3000
0
Ground
4000
50
GND
5000
0
1
6000
40
Function
7000
0
Name
Altitude
in standard
atmosphere
8000
30
Pin
Altitude above sea level [m]
9000
Package dimensions in mm
Barometric pressure [hPa]
Bosch is the world market leader in MEMS sensors.
The BMP085 offers this high experience and relia­
bility for consumer applications. Bosch Sensortec
is a subsidiary of Bosch that focuses on micromechanical components for the non-automotive markets.
Please contact us for further details. We are happy
to provide you with more information.
Headquarters
Bosch Sensortec GmbH
Gerhard-Kindler-Strasse 8
72770 Reutlingen · Germany
Telephone +49 7121 3535 9 00
Fax +49 7121 3535 9 09
[email protected]
www.bosch-sensortec.com
Specification subject to change without notice
Version_0.2_022008
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to third parties. BOSCH and the symbols are registered trademarks of Robert Bosch GmbH, Germany.