BMP085

Data sheet

Bosch Sensortec

Rev. 1.2

Page 16

15 October 2009

© 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.

Specifications are subject to change without notice.

4.2 Device and register address

The BMP085 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).

A7

A6

A5

A4

A3

A2

A1

W/R

1

1

1

0

1

1

1

0/1

There is an easy way to connect two BMP085 to the same I

input of BMP085 to set one BMP085 part silent while you communicate with the other BMP085

part via I

controller, or one digital output and one inverter.

4.3 I

The I

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.