User Manual

Data sheet
BMP085
Page 9
BST-BMP085-DS000-06 | Revision 1.3 | August 2011 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.
3. Operation
3.1 General description
The BMP085 is designed to be connected directly to a microcontroller of a mobile device via the
I
2
C bus. The pressure and temperature data has to be compensated by the calibration data of
the E
2
PROM of the BMP085.
3.2 General function and application schematics
The BMP085 consists of a piezo-resistive sensor, an analog to digital converter and a control
unit with E
2
PROM and a serial I
2
C interface. The BMP085 delivers the uncompensated value of
pressure and temperature. The E
2
PROM 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)