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Final data sheet

BME280

Combined humidity and pressure sensor

Bosch Sensortec

BME280: Final data sheet

Document revision

Document release date

Document number

Technical reference code(s)

Notes

1.0

November 11 , 2014

BST-BME280-DS001-09

0 273 141 185

Data in this document are subject to change without notice. Product

photos and pictures are for illustration purposes only and may differ from

the real product’s appearance.

Final Datasheet

BME280 Environmental sensor

Page 2

BME280

IGITAL HUMIDITY

PRESSURE AND TEMPERATURE SENSOR

Key features



Package



Digital interface



Supply voltage



2.5 mm x 2.5 mm x 0.93 mm metal lid LGA

I²C (up to 3.4 MHz) and SPI (3 and 4 wire, up to 10 MHz)

main supply voltage range: 1.71 V to 3.6 V

DDIO

interface voltage range: 1.2 V to 3.6 V

Current consumption

1.8 µA @ 1 Hz humidity and temperature

2.8 µA @ 1 Hz pressure and temperature

3.6 µA @ 1 Hz humidity, pressure and temperature

0.1 µA in sleep mode

Operating range

-40…+85 °C, 0…100 % rel. humidity, 300…1100 hPa

Humidity sensor and pressure sensor can be independently enabled / disabled

RoHS compliant, halogen-free, MSL1



Key parameters for humidity sensor



Response time



Accuracy tolerance

±3 % relative humidity



Hysteresis

±1% relative humidity

Key parameters for pressure sensor



RMS Noise

0.2 Pa, equiv. to 1.7 cm



Offset temperature coefficient ±1.5 Pa/K, equiv. to ±12.6 cm at 1 °C temperature change

Typical application



Context awareness, e.g. skin detection, room change detection



Health monitoring / well-being



Warning regarding dehydration or heat stroke



Spirometry (measurement of lung volume and air flow)



Home automation control



control heating, venting, 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)

Target devices



Handsets such as mobile phones, tablet PCs, GPS devices



Navigation systems and gaming, e.g flying toys



Camera (DSC, video) and portable health care devices



Home weather stations, flying toys and smart watches

BST-BME280-DS001-09 | Revision 1.0 | November 2014

Bosch Sensortec

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.

Final Datasheet

BME280 Environmental sensor

Page 3

General Description

The BME280 is as combined digital humidity, pressure and temperature sensor based on

proven sensing principles. The sensor module is housed in an extremely compact metal-lid LGA

package with a footprint of only 2.5 × 2.5 mm² with a height of 0.93 mm. Its small dimensions

and its low power consumption allow the implementation in battery driven devices such as

handsets, GPS modules or watches. The BME280 is register and performance compatible to

the Bosch Sensortec BMP280 digital pressure sensor (see chapter 5.2 for details).

The BME280 achieves high performance in all applications requiring humidity and pressure

measurement. These emerging applications of home automation control, in-door navigation,

health care as well as GPS refinement require a high accuracy and a low TCO at the same

time.

The humidity sensor provides an extremely fast response time for fast context awareness

applications and high overall accuracy over a wide temperature range.

The pressure sensor is an absolute barometric pressure sensor with extremely high accuracy

and resolution and drastically lower noise than the Bosch Sensortec BMP180.

The integrated temperature sensor has been optimized for lowest noise and highest resolution.

Its output is used for temperature compensation of the pressure and humidity sensors and can

also be used for estimation of the ambient temperature.

The sensor provides both SPI and I²C interfaces and can be supplied using 1.71 to 3.6 V for the

sensor supply V

and 1.2 to 3.6 V for the interface supply V

DDIO

. Measurements can be

triggered by the host or performed in regular intervals. When the sensor is disabled, current

consumption drops to 0.1 µA.

BME280 can be operated in three power modes (see chapter 3.3):



sleep mode

normal mode

forced mode

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.

Please contact your regional Bosch Sensortec partner for more information about software

packages.

BST-BME280-DS001-09 | Revision 1.0 | November 2014

Bosch Sensortec

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.

Final Datasheet

BME280 Environmental sensor

Page 4

Index of Contents

1. SPECIFICATION ........................................................................................................................ 7

1.1 G

ENERAL ELECTRICAL SPECIFICATION

.................................................................................. 7

1.2 H

UMIDITY PARAMETER SPECIFICATION

................................................................................. 8

1.3 P

RESSURE SENSOR SPECIFICATION

..................................................................................... 9

1.4 T

EMPERATURE SENSOR SPECIFICATION

............................................................................. 10

2. ABSOLUTE MAXIMUM RATINGS .......................................................................................... 11

3. FUNCTIONAL DESCRIPTION ................................................................................................. 11

3.1 B

LOCK DIAGRAM

............................................................................................................... 11

3.2 P

OWER MANAGEMENT

....................................................................................................... 12

3.3 S

ENSOR MODES

................................................................................................................ 12

3.3.1 S

ENSOR MODE TRANSITIONS

......................................................................................................... 12

3.3.2 S

LEEP MODE

................................................................................................................................. 13

3.3.3 F

ORCED MODE

.............................................................................................................................. 13

3.3.4 N

ORMAL MODE

.............................................................................................................................. 14

3.4 M

EASUREMENT FLOW

....................................................................................................... 14

3.4.1 H

UMIDITY MEASUREMENT

.............................................................................................................. 15

3.4.2 P

RESSURE MEASUREMENT

............................................................................................................ 15

3.4.3 T

EMPERATURE MEASUREMENT

...................................................................................................... 15

3.4.4 IIR

FILTER

..................................................................................................................................... 16

3.5 R

ECOMMENDED MODES OF OPERATION

.............................................................................. 17

3.5.1 W

EATHER MONITORING

................................................................................................................. 17

3.5.2 H

UMIDITY SENSING

........................................................................................................................ 18

3.5.3 I

NDOOR NAVIGATION

...................................................................................................................... 18

3.5.4 G

AMING

........................................................................................................................................ 19

3.6 N

OISE

.............................................................................................................................. 19

4. DATA READOUT ..................................................................................................................... 21

4.1 D

ATA REGISTER SHADOWING

............................................................................................. 21

4.2 O

UTPUT COMPENSATION

................................................................................................... 21

4.2.1 C

OMPUTATIONAL REQUIREMENTS

.................................................................................................. 22

4.2.2 T

RIMMING PARAMETER READOUT

................................................................................................... 22

4.2.3 C

OMPENSATION FORMULAS

........................................................................................................... 23

5. GLOBAL MEMORY MAP AND REGISTER DESCRIPTION .................................................. 25

5.1 G

ENERAL REMARKS

.......................................................................................................... 25

5.2 R

EGISTER COMPATIBILITY TO

BMP280 .............................................................................. 25

5.3 M

EMORY MAP

................................................................................................................... 25

5.4 R

EGISTER DESCRIPTION

.................................................................................................... 26

BST-BME280-DS001-09 | Revision 1.0 | November 2014

Bosch Sensortec

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.

Final Datasheet

BME280 Environmental sensor

Page 5

5.4.1 R

EGISTER

“

”

..................................................................................................................... 26

5.4.2 R

EGISTER

“

RESET

”

............................................................................................................... 26

5.4.3 R

EGISTER

“

CTRL

HUM

”

........................................................................................................ 26

5.4.4 R

EGISTER

“

STATUS

”

............................................................................................................. 26

5.4.5 R

EGISTER

“

CTRL

MEAS

”

....................................................................................................... 27

5.4.6 R

EGISTER

“

CONFIG

”

............................................................................................................. 28

5.4.7 R

EGISTER

F7…0

“

PRESS

” (_

MSB

, _

LSB

, _

XLSB

)

................................................................... 29

5.4.8 R

EGISTER

FA…0

“

TEMP

” (_

MSB

, _

LSB

, _

XLSB

)....................................................................

5.4.9 R

EGISTER

FD…0

“

HUM

” (_

MSB

, _

LSB

)

................................................................................ 30

6. DIGITAL INTERFACES ............................................................................................................ 31

6.1 I

NTERFACE SELECTION

...................................................................................................... 31

6.2 I²C I

NTERFACE

.................................................................................................................. 31

6.2.1 I²C

WRITE

..................................................................................................................................... 32

6.2.2 I²C

READ

...................................................................................................................................... 33

6.3 SPI

INTERFACE

................................................................................................................. 33

6.3.1 SPI

WRITE

.................................................................................................................................... 34

6.3.2 SPI

READ

..................................................................................................................................... 34

6.4 I

NTERFACE PARAMETER SPECIFICATION

............................................................................. 35

6.4.1 G

ENERAL INTERFACE PARAMETERS

................................................................................................ 35

6.4.2 I²C

TIMINGS

.................................................................................................................................. 35

6.4.3 SPI

TIMINGS

................................................................................................................................. 36

7. PIN-OUT AND CONNECTION DIAGRAM............................................................................... 38

7.1 P

OUT

........................................................................................................................... 38

7.2 C

ONNECTION DIAGRAM

C ................................................................................................ 39

7.3 C

ONNECTION DIAGRAM

WIRE

SPI ................................................................................... 40

7.4 C

ONNECTION DIAGRAM

WIRE

SPI ................................................................................... 41

7.5 P

ACKAGE DIMENSIONS

...................................................................................................... 42

7.6 L

ANDING PATTERN RECOMMENDATION

............................................................................... 43

7.7 M

ARKING

.......................................................................................................................... 44

7.7.1 M

ASS PRODUCTION DEVICES

......................................................................................................... 44

7.7.2 E

NGINEERING SAMPLES

................................................................................................................. 45

7.8 S

OLDERING GUIDELINES AND RECONDITIONING RECOMMENDATIONS

.................................... 46

7.9 R

ECONDITIONING

ROCEDURE

.......................................................................................... 47

7.10 T

APE AND REEL SPECIFICATION

........................................................................................ 47

7.10.1 D

IMENSIONS

............................................................................................................................... 47

7.10.2 O

RIENTATION WITHIN THE REEL

.................................................................................................... 48

7.11 M

OUNTING AND ASSEMBLY RECOMMENDATIONS

............................................................... 49

7.12 E

NVIRONMENTAL SAFETY

................................................................................................ 49

7.12.1 R

HS ........................................................................................................................................ 49

7.12.2 H

ALOGEN CONTENT

.................................................................................................................... 49

7.12.3 I

NTERNAL PACKAGE STRUCTURE

.................................................................................................. 49

BST-BME280-DS001-09 | Revision 1.0 | November 2014

Bosch Sensortec

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.

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Bourns新型环境压力传感器，可精确测量250-500Pa范围内压力

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自动驾驶让传感器变得越来越聪明

翻译自——newelectronics，NeilTylerAutoSens是汽车传感器和感知技术的会议，它将工程师和其他参与ADAS和自动驾驶市场的相关人员联系起来。这一届是在比利时布鲁塞尔举世闻名的AutoWorld博物馆举行，行业领导者齐聚一堂，研究并评估了ADAS的最新发展。到2025年，这个市场的价值预计将超过670亿美元，这并不都是智能科技发展的功劳，而是因为创新水...[详细]
霍尼韦尔发布新的电路板安装型微压力传感器

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ST 推出全新麦克风接口芯片增强便携产品互动性

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