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BME280
Integrated Environmental Unit
Bosch Sensortec
General Description
The BME280 is an integrated environmental sensor developed specifically for mobile applications where size
and low power consumption are key design constraints.
The unit combines individual high linearity, and high accuracy sensors for pressure, humidity and temperature
in an 8-pin metal-lid 2.5 x 2.5 x 0.93 mm3 LGA package.
The BME280 designed for low current consumption (3.6
µA @1Hz), long term stability, and high EMC robustness.
The humidity sensor features an extremely fast response
time which supports performance requirements for
emerging applications such as: context awareness, and
high accuracy over a wide temperature range.
The pressure sensor is an absolute barometric pressure
sensor which features exceptionally high accuracy and
resolution at very low noise.
The integrated temperature sensor has been optimized
for very low noise and high resolution. It is primarily
used for temperature compensation of the pressure and
humidity sensors, and can also be used for estimating
ambient temperature.
The BME280 supports a full suite of operating modes
which provides the flexibility to optimize the device for
power consumption, resolution, and filter performance.
BME280 Target Applications
f Context awareness, e.g. skin detection, room change
detection
f Health monitoring/well-being
‒ Warning regarding dehydration or heat stroke
‒ Measurement of lung volume and air flow
f Home automation control
‒ Control heating, ventilation, air conditioning
(HVAC)
f Internet of things
f GPS enhancement (e.g. time-to-first-fix improvement,
dead reckoning, slope detection)
f Indoor navigation (change of floor detection,
elevator detection)
f Outdoor navigation, leisure and sports applications
Technical data BME280 (prelim.)
Package dimensions
Operation range
(full accuracy)
Supply voltage V
Supply voltage V
Interface I²C and SPI
Average current
consumption (typ.)
(1Hz data refresh rate)
Average current consumption in sleep mode
Humidity sensor
Response time (τ
Accuracy tolerance
Hysteresis
Pressure sensor
RMS Noise
Sensitivity Error
Temperature
coefficient
offset
RoHS compliant, halogen-free, MSL1
f Weather forecast
f Vertical velocity indication (rise/sink speed)
Technology and Specification
Emerging applications such as indoor navigation, home
automation control, personalized weather stations, and
innovative sport and fitness tools require a pressure
sensor with high relative accuracy and a low TCO, in
combination with fast response, high accuracy of relative humidity and ambient temperature measurements.
DDIO
DD
63%
)
8-Pin LGA with metal
2.5 x 2.5 x 0.93 mm³
Pressure: 300...1100 hPa
Temperature: -40…+85 °C
1.2 ... 3.6 V
1.71 ... 3.6 V
1.8 μA @ 1 Hz (H, T)
2.8 μA @ 1 Hz (P, T)
3.6 μA @ 1 Hz (H, P, T)
T=temperature
0.1 µA
1s
± 3 % relative humidity
≤ 2 % relative humidity
0.2 Pa (equiv. to 1.7 cm)
± 0.25 % (equiv. to 1 m at
400 m height change)
±11.5 Pa/K
(equiv. to ±12.6 cm at 1°C
temperature change
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| Bosch Sensortec | BME280
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Pin configuration and dimensions (bottom view, pads visible)
The BME280 is perfectly suitable for such applications
as the device features excellent relative accuracy of
±0.12 hPa (equivalent to ±1 m difference in altitude),
and an offset temperature coefficient (TCO) of only
1.5 Pa/K (equivalent to 12.6cm/K).
Sensor Operation
The BME280 supports I2C and SPI (3-wire/4-wire)
digital, serial interfaces.
The sensor can be operated in three power modes:
Sleep mode, 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 BME280 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 that require a low sampling rate or hostbased synchronization.
In order to tailor data rate, noise, response time and
current consumption to the needs of the user, a variety
of oversampling modes, filter modes and data rates can
be selected. In combination with several short term disturbance filter settings, the sensor can be programmed
in a very flexible way in order to adapt to application
and power management requirements.
To simplify the design-in phase, default settings optimized for several example use-cases such as weather
monitoring, elevator/stair case detection, drop detection or indoor-navigation are provided.
Pin No. Name Function
1 GND Ground
2 CSB Chip select
3 SDI Serial data input
4 SCK Serial clock input
5 SDO Serial data output
6 V
DDIO Digital/Interface supply
7 GND Ground
8 V
DD Analog supply
Software
The Altitude Content Provider ACP2.0 software is
available as a software package for the BME280 which
calculates 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 available.
System Compatibility
The BME280 has been designed for best possible fit into
modern mobile consumer electronics devices. Besides
the ultra-small footprint and very low power consumption, the BME280 has very wide ranges for VDD and V
DDIO
supply voltages
Bosch is the world market leader in MEMS sensors. The
BME280 from Bosch Sensortec combines extensive experience with reliability for consumer applications. Bosch
Sensortec is a subsidiary of Bosch that focuses on micromechanical components for the non-automotive markets.
Headquarters
Bosch S ensor tec GmbH
Gerhard-Kindler-Strasse 9
72770 Reutlingen · Germany
Telephone +49 7121 3535 900
Fax +49 7121 3535 909
[email protected]
www.bosch-sensortec.com
Doc.-Number: BST-BME280-FL000-00 / Version_1.1_062015Data & Specification subject to change without notice
© Bosch Sensor tec GmbH reserves all rights in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third
parties. BOSCH and the symbols are registered trademarks of Rober t Bosch GmbH, Germany.
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