BMP280

Overview

GENERAL DESCRIPTION BMP280 is an absolute barometric pressure sensor especially designed for mobile applications. The sensor module is housed in an extremely compact package. Its small dimensions and its low power consumption allow for the implementation in battery driven devices such as mobile phones, GPS modules or watches. As its predecessor BMP180, the BMP280 is based on Bosch’s proven piezo-resistive pressure sensor technology featuring high accuracy and linearity as well as long term stability and high EMC robustness. Numerous device operation options offer highest flexibility to optimize the device regarding power consumption, resolution and filter performance. A tested set of default settings for example use case is provided to the developer in order to make design-in as easy as possible.

BMP280 (preliminary) Technical data

Package dimensions 8-pin LGA with metal 2.0 x 2.5 x 0.95 mm³

Operation range (full accuracy)

Pressure: 300 ... 1100 hPa Temperature: 0 … +65 °C

Interface I²C and SPI

Average current consumption (typ.) (1 Hz data refresh rate)

2.74 µA (ultra-low power mode)

Average current con- sumption in sleep mode 0.1 µA

Average measurement time

5.5 msec (ultra-low power preset)

Applications

Pressure: 0.18 Pa (eqiuv. to <10 cm) Temperature: 0.01 K

Resolution of data

 Enhancement of GPS navigation (e.g. time-to-first-fix

improvement, dead-reckoning, slope detection)

Absolute accuracy P = 950 ... 1100 hPa (T = 0 ... +65 °C)

 Indoor navigation (floor detection, elevator detection)

~ ±1 hPa

 Outdoor navigation, leisure and sports applications

 Weather forecast

Relative accuaracy pressure (typ.) p=950 ... 1050 hP (+25 °C)

 Vertical velocity indication (e.g. rise/sink speed)

± 0.12 hPa (equiv. to ±1 m)

Temperature coefficient offset (+25° ... +40 °C @900hPa)

1.5 Pa/K (equiv. to 12.6 cm/K)

At the same time BMP280 features more application flexibility, new filter modes and SPI interface besides the shrinkage of footprint by 63 % with respect to BMP180. SENSOR OPERATION The BMP280 features I²C and SPI (3-wire/4-wire) digital, serial interfaces. The sensor can be operated in two power modes: The normal mode and the forced mode. In normal mode the sensor automatically cycles between a measurement and a standby period. This mode is recommended when using BMP280 built-in IIR filter when short-term disturbances (e.g. blowing into the sensor) need to be filtered. In forced mode the sensor performs a single measurement on request and returns to sleep mode afterwards. This mode is recommended for applications which require low sampling rate or host-based synchronization. Internal oversampling rates for pressure and temperature measurement can be selected independently between 1, 2, 4, 8 and 16 times oversampling. In combination with several short term disturbance filter settings, sensor can be programmed in a very flexible way in order to adapt to application and power management requirements. For easy design-in default settings are provided to the devel- oper, which are optimized to several example use-cases for barometric pressure sensors like weather monitoring, elevator/ stair case detection, drop detection or indoor navigation. SOFTWARE The Altitude Content Provider ACP2.0 software is available as software package for BMP280 in order to calculate the altitude with best possible accuracy. The ACP2.0 uses the sea level pressure to calculate the altitude, compensating for the non- sphericallicity of the earth by geoid correction and compares its altitude with current altitude given by the GPS module, if avail- able. SYSTEM COMPATIBILITY The BMP280 has been designed for best possible fit into modern mobile consumer electronics devices. Besides the ultra- small footprint and very low power consumption, the BMP280 has very wide ranges for V DD and V DDIO supply voltages.

Pin configuration (bottom view)

Pin configuratio n Pin Name Function

8 V DD Analog supply

Headquarters Bosch Sensortec GmbH