BMP180 datasheet(19/29 Pages) BOSCH

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Data sheet

BMP180

Page 19

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

Bosch Sensortec

parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.

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

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

Min.

Typ

Max.

Units

Clock input frequency

fSCL

3.4

MHz

Input-low level

VIL

0.2 * VDDIO

Input-high level

VIH

0.8 * VDDIO

VDDIO

Voltage output low level

@ VDDIO = 1.62V, IOL = 3mA

VOL

0.3

SDA and SCL pull-up resistor

Rpull-up

2.2

kOhm

SDA sink current

@ VDDIO = 1.62V, VOL = 0.3V

ISDA_sink

Start-up time after power-up,

before first communication

tStart

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