Data Sheet

Final Datasheet
BME280 Environmental sensor
Page 4
BST-BME280-DS001-10 | Revision 1.1 | May 2015 Bosch Sensortec
© Bosch Sensortec GmbH reserves all rights even 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 symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
Index of Contents
1. SPECIFICATION ........................................................................................................................ 7
1.1 GENERAL ELECTRICAL SPECIFICATION .................................................................................. 7
1.2 HUMIDITY PARAMETER SPECIFICATION ................................................................................. 8
1.3 PRESSURE SENSOR SPECIFICATION ..................................................................................... 9
1.4 TEMPERATURE SENSOR SPECIFICATION ............................................................................. 10
2. ABSOLUTE MAXIMUM RATINGS .......................................................................................... 10
3. FUNCTIONAL DESCRIPTION ................................................................................................. 11
3.1 BLOCK DIAGRAM ............................................................................................................... 11
3.2 POWER MANAGEMENT ....................................................................................................... 11
3.3 SENSOR MODES ................................................................................................................ 12
3.3.1 SENSOR MODE TRANSITIONS ......................................................................................................... 12
3.3.2 SLEEP MODE ................................................................................................................................. 13
3.3.3 FORCED MODE .............................................................................................................................. 13
3.3.4 NORMAL MODE .............................................................................................................................. 13
3.4 MEASUREMENT FLOW ....................................................................................................... 14
3.4.1 HUMIDITY MEASUREMENT .............................................................................................................. 15
3.4.2 PRESSURE MEASUREMENT ............................................................................................................ 15
3.4.3 TEMPERATURE MEASUREMENT ...................................................................................................... 15
3.4.4 IIR FILTER ..................................................................................................................................... 15
3.5 RECOMMENDED MODES OF OPERATION .............................................................................. 17
3.5.1 WEATHER MONITORING ................................................................................................................. 17
3.5.2 HUMIDITY SENSING ........................................................................................................................ 17
3.5.3 INDOOR NAVIGATION...................................................................................................................... 17
3.5.4 GAMING ........................................................................................................................................ 18
3.6 NOISE .............................................................................................................................. 18
4. DATA READOUT ..................................................................................................................... 21
4.1 DATA REGISTER SHADOWING ............................................................................................. 21
4.2 OUTPUT COMPENSATION ................................................................................................... 21
4.2.1 COMPUTATIONAL REQUIREMENTS .................................................................................................. 21
4.2.2 TRIMMING PARAMETER READOUT ................................................................................................... 22
4.2.3 COMPENSATION FORMULAS ........................................................................................................... 23
5. GLOBAL MEMORY MAP AND REGISTER DESCRIPTION .................................................. 24
5.1 GENERAL REMARKS .......................................................................................................... 24
5.2 REGISTER COMPATIBILITY TO BMP280 .............................................................................. 24
5.3 MEMORY MAP ................................................................................................................... 24
5.4 REGISTER DESCRIPTION .................................................................................................... 25