Data sheet

BMP180

Page 22

BST-BMP180-DS000-12 | Revision 2.8 | May 2015

Bosch Sensortec

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Note: Specifications within this document are subject to change without notice.

S

ACKS

Module address

write 0xEE

ACKS

Register address

e.g. 0xF6

MSB e.g.

ADC result 0x5C

ACKS

Module address

read 0xEF

Restart

ACKM

LSB e.g.

ADC result 0x96

NACKM

SCL

PR

OM

SDA

P

To read out the temperature data word UT (16 bit), the pressure data word UP (16 to 19 bit) and

After the start condition the master sends the module address write command and register address.

The register address selects the read register:

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

Figure 9: Timing diagram read 16 bit A/D conversion result