BMP183 datasheet(9/28 Pages) BOSCH

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Data sheet

BMP183

Page 9

BST-BMP183-DS000-00 | Revision 1.0 | June 2012

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.

3. Operation

3.1 Power supply and power on sequence

The BMP183 has two distinct power supply pins: VDD and VDDIO. VDD powers the internal digital

and analogue circuitry and should not suffer from large voltage spikes. VDDIO is the supply for the

digital interface and must match the voltages on the SPI interface. In case the voltage range allows it,

VDD and VDDIO can be fed from a single supply line which must be >1.8V.

The preferred power on sequence is VDD first. Even though VDDIO can be powered on before VDD,

there is a chance of excessive power consumption (a few mA) if this sequence is used, and the state

of the output pins is undefined so that the bus can be locked. Therefore, VDD must be powered

before VDDIO unless the limitations above are understood and not critical.

3.2 General description

The BMP183 is designed to be connected directly to a microcontroller of a mobile device via the SPI

bus. The pressure and temperature data has to be compensated by the calibration data of the

E2PROM of the BMP183.

3.3 General function and application schematics

The BMP183 consists of a piezo-resistive sensor, an analog to digital converter and a control unit

with E2PROM and a SPI interface. The BMP183 delivers the uncompensated value of pressure and

temperature. The E2PROM 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)

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