Bosch BME680 User manual

Bosch Sensortec
BME680
Integrated Environmental Unit
General description
BME680 is an integrated environmental sensor develo-
ped specifically for mobile applications and wearables
where size and low power consumption are key requi-
rements. Expanding Bosch Sensortec’s existing family
of environmental sensors, the BME680 integrates for
the first time individual high linearity and high accuracy
sensors for gas, pressure, humidity and temperature.
It consists of an 8-pin metal-lid 3.0 x 3.0 x 0.95 mm3
LGA package which is designed for optimized consump-
tion depending on the specific operating mode, long
term stability and high EMC robustness.
The gas sensor within the BME680 can detect a broad
range of gases to measure indoor air quality for personal
well being.
Gases that can be detected by the BME680 include
Volatile Organic Compounds (VOC) from paints (such
as formaldehyde), lacquers, paint strippers, cleaning
supplies, furnishings, office equipment, glues, adhesives
and alcohol.
The humidity sensor features a best-in-class response
time supporting performance requirements for emerging
applications such as context awareness, and high
accuracy over a wide temperature range.
The pressure sensor is an absolute barometric pres-
sure sensor featuring 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 gas, pressure
and humidity sensors, and can also be used for estima-
ting ambient temperature.
The BME680 supports a full suite of operating modes
which provides huge flexibility optimizing the device for
power consumption, resolution and filter performance.
Applications and Use Cases
fIndoor air quality measurement
fPersonalized weather station
fContext awareness, e.g. skin moisture detection,
room change detection
fHealth monitoring / well-being
‒ Warning regarding dehydration or heat stroke
‒ Measurement of lung volume and air flow
fHome automation control (e.g. HVAC)
fGPS enhancement (e.g. time-to-first-fix improvement,
dead reckoning, slope detection)
fIndoor navigation (change of floor detection, elevator
detection)
fAltitude tracking and calories expenditure for sports
activities
Emerging applications such as home automation,
indoor navigation, personalized weather stations and
innovative sport and fitness tools require a gas sensor
with quick response time, a pressure sensor with high
relative accuracy and a low TCO, in combination with
fast response, high accuracy, relative humidity and
ambient temperature measurements. The BME680 is
ideally suited for such barometer 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 (equiva-
lent to 12.6cm/K).
Sensor operation
The BME680 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 forced mode.
In normal mode, the sensor automatically cycles bet-
ween a measurement and a standby period. This mode
is recommended when using BME680’s 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 measure-
ment on request and returns to sleep mode afterwards.
This mode is recommended for applications which re-
quire 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

Headquarters
Bosch Sensortec GmbH
Gerhard-Kindler-Strasse 9
72770 Reutlingen · Germany
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[e-mail]
www.bosch-sensortec.com
| Bosch Sensortec | BME680
2
Data & Specification subject to change without notice Doc.-Number: BST-BME680-FL000-00 / Version_1.0_122014
© 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 par-
ties. BOSCH and the symbols are registered trademarks of Robert Bosch GmbH, Germany.
be selected. Applying 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 opti-
mized for several example applications such as weather
monitoring, elevator/staircase detection, drop detection
or indoor-navigation are provided.
Software
The BME680 comes fully calibrated for all sensor com-
ponents. For pressure calculation, Bosch Sensortec’s
Altitude Content Provider ACP2.0 software is available
as a software package for BME680. It calculates the alti-
tude with best possible accuracy. The ACP2.0 software
uses the sea-level pressure to calculate the altitude,
compensating for the non-sphericality of the earth by
geoid correction, and compares its altitude with current
altitude given by the GPS module, if available.
System compatibility
The BME680 has been designed for best possible fit into
modern mobile consumer electronics devices. Besides
the small footprint and low power consumption, the
BME680 has very wide ranges for VDD and VDDIO supply
voltages.
Bosch is the world market leader in MEMS sensors. The
BME680 from Bosch Sensortec combines this extensive
experience and relia¬bility for consumer applications.
Pin configuration and dimensions (bottom view, pads visible)
PinNo. Name Function
1GND Ground
2CSB Chip select
3SDI Serial data input
4 SCK Serial clock input
5 SDO Serial data output
6 VDDIO Digital/Interface supply
7GND Ground
8 VDD Analog supply