Bosch Sensortec
BME280
Integrated Environmental Unit
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
mm
3
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.
TECHNICAL SPECIFICATIONS
BME280 (preliminary) Technical data
Package dimensions
Operation range
(full accuracy)
Supply voltage V
DDIO
Supply voltage V
DD
Interface
Average current
consumption (typ.)
(1Hz data refresh rate)
Average current con-
sumption in sleep mode
Humidity sensor
Response time (τ
63%
)
Accuracy tolerance
Hysteresis
Pressure sensor
RMS Noise
Sensitivity Error
Temperature
coefficient
offset
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
I²C and SPI
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)
±1.5 Pa/K
(equiv. to ±12.6 cm at 1 °C
temperature change)
BME280 TARGET APPLICATIONS
Context awareness, e.g. skin detection, room change
detection
Fitness monitoring/well-being
‒ Warning regarding dryness or high temperatures
‒ Measurement of volume and air flow
Home automation control
‒ Control heating, ventilation, air conditioning (HVAC)
Internet of things
GPS enhancement (e.g. time-to-first-fix improvement,
dead reckoning, slope detection)
Indoor navigation (change of floor detection,
elevator detection)
Outdoor navigation, leisure and sports applications
Weather forecast
Vertical velocity indication (rise/sink speed)
RoHS compliant, halogen-free, MSL1
Bosch Sensortec
| BME280
2|2
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 host-based 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 combi-
nation 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 configuration (bottom view)
TECHNICAL SPECIFICATIONS
Pin
configuratio
Name
Pin
n
1
GND
2
3
4
5
6
7
8
CSB
SDI
SCK
SDO
V
DDIO
GND
V
DD
SOFTWARE
Function
Ground
Chip select
Serial data input
Serial clock input
Serial data output
Digital/Interface supply
Ground
Analog supply
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 V
DD
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 Sensortec GmbH
Gerhard-Kindler-Strasse 9
72770 Reutlingen · Germany
Telephone +49 7121 3535 900
Fax +49 7121 3535 909
www.bosch-sensortec.com
TECHNOLOGY AND SPECIFICATION
Emerging applications such as indoor navigation, home
automation control, personalized weather stations, and inno-
vative 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.
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
12.6 cm/K).
Data & Specification are preliminary and subject to change without notice
| |
Bosch Sensortec 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 Robert Bosch GmbH, Germany.
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