Datasheet

BMP280 Digital Pressure Sensor

Page 10

BST-BMP280-DS001-19 | Revision 1.19 | January 2018

Bosch Sensortec

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

Note: Specifications within this document are subject to change without notice. Not intended for publication.

3. Functional description

The BMP280 consists of a Piezo-resistive pressure sensing element and a mixed-signal ASIC.

The ASIC performs A/D conversions and provides the conversion results and sensor specific

compensation data through a digital interface.

BMP280 provides highest flexibility to the designer and can be adapted to the requirements

regarding accuracy, measurement time and power consumption by selecting from a high number

of possible combinations of the sensor settings.

BMP280 can be operated in three power modes (see chapter 3.6):

 sleep mode

 normal mode

 forced mode

In sleep mode, no measurements are performed. Normal mode comprises an automated

perpetual cycling between an active measurement period and an inactive standby period. In

forced mode, a single measurement is performed. When the measurement is finished, the sensor

returns to sleep mode.

A set of oversampling settings is available ranging from ultra low power to ultra high resolution

setting in order to adapt the sensor to the target application. The settings are predefined

combinations of pressure measurement oversampling and temperature measurement

oversampling. Pressure and temperature measurement oversampling can be selected

independently from 0 to 16 times oversampling (see chapter 3.3.1 and 3.3.2):

 Temperature measurement

 Ultra low power

 Low power

 Standard resolution

 High resolution

 Ultra high resolution

BMP280 is equipped with a built-in IIR filter in order to minimize short-term disturbances in the

output data caused by the slamming of a door or window. The filter coefficient ranges from 0 (off)

to 16.

In order to simplify the device usage and reduce the high number of possible combinations of

power modes, oversampling rates and filter settings, Bosch Sensortec provides a proven set of

recommendations for common use-cases in smart-phones, mobile weather stations or flying toys

(see chapter 3.4):

 Handheld device low-power (e.g. smart phones running Android)

 Handheld device dynamic (e.g. smart phones running Android)

 Weather monitoring (setting with lowest power consumption)

 Elevator / floor change detection

 Drop detection

 Indoor navigation