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PDF BMP280 Data sheet ( Hoja de datos )

Número de pieza BMP280
Descripción Digital Pressure Sensor
Fabricantes Bosch 
Logotipo Bosch Logotipo



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Data sheet
BMP280
Digital Pressure Sensor
Bosch Sensortec
BMP280: Data sheet
Document revision
Document release date
Document number
Technical reference code(s)
Notes
1.14
May 5th, 2015
BST-BMP280-DS001-11
0273 300 416
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.

1 page




BMP280 pdf
Datasheet
BMP280 Digital Pressure Sensor
Page 5
5. DIGITAL INTERFACES............................................................................................................28
5.1 INTERFACE SELECTION ...................................................................................................... 28
5.2 I²C INTERFACE.................................................................................................................. 28
5.2.1 I²C WRITE .................................................................................................................................... 29
5.2.2 I²C READ ..................................................................................................................................... 29
5.3 SPI INTERFACE................................................................................................................. 30
5.3.1 SPI WRITE ................................................................................................................................... 31
5.3.2 SPI READ .................................................................................................................................... 31
5.4 INTERFACE PARAMETER SPECIFICATION ............................................................................. 32
5.4.1 GENERAL INTERFACE PARAMETERS............................................................................................... 32
5.4.2 I²C TIMINGS ................................................................................................................................. 32
5.4.3 SPI TIMINGS ................................................................................................................................ 33
6. PIN-OUT AND CONNECTION DIAGRAM...............................................................................35
6.1 PIN-OUT ........................................................................................................................... 35
6.2 CONNECTION DIAGRAM 4-WIRE SPI ................................................................................... 36
6.3 CONNECTION DIAGRAM 3-WIRE SPI ................................................................................... 37
6.4 CONNECTION DIAGRAM I2C................................................................................................ 38
7. PACKAGE, REEL AND ENVIRONMENT................................................................................39
7.1 OUTLINE DIMENSIONS ....................................................................................................... 39
7.2 LANDING PATTERN RECOMMENDATION ............................................................................... 40
7.3 MARKING.......................................................................................................................... 41
7.3.1 MASS PRODUCTION DEVICES ........................................................................................................ 41
7.3.2 ENGINEERING SAMPLES................................................................................................................ 41
7.4 SOLDERING GUIDELINES .................................................................................................... 42
7.5 TAPE AND REEL SPECIFICATION ......................................................................................... 43
7.5.1 DIMENSIONS ................................................................................................................................ 43
7.5.2 ORIENTATION WITHIN THE REEL..................................................................................................... 43
7.6 MOUNTING AND ASSEMBLY RECOMMENDATIONS ................................................................. 44
7.7 ENVIRONMENTAL SAFETY .................................................................................................. 44
7.7.1 ROHS ......................................................................................................................................... 44
7.7.2 HALOGEN CONTENT ..................................................................................................................... 44
7.7.3 INTERNAL PACKAGE STRUCTURE ................................................................................................... 44
8. APPENDIX 1: COMPUTATION FORMULAE FOR 32 BIT SYSTEMS ..................................44
8.1 COMPENSATION FORMULA IN FLOATING POINT .................................................................... 44
8.2 COMPENSATION FORMULA IN 32 BIT FIXED POINT ................................................................ 45
9. LEGAL DISCLAIMER...............................................................................................................47
9.1 ENGINEERING SAMPLES .................................................................................................... 47
BST-BMP280-DS001-11 | Revision 1.14 | 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. Not intended for publication.

5 Page





BMP280 arduino
Datasheet
BMP280 Digital Pressure Sensor
Page 11
3.1 Block diagram
Figure 1 shows a simplified block diagram of the BMP280:
VDD
VDDIO
Pressure/
temperature
sensing
element
Voltage
regulator
(analog &
digital)
Voltage
reference
Analog
front-end
ADC
Logic
OSC POR NVM
GND
Figure 1: Block diagram of BMP280
I
n
t
e
r
f
a
c
e
SDI
SDO
SCK
CSB
3.2 Power management
The BMP280 has two separate power supply pins
VDD is the main power supply for all internal analog and digital functional blocks
VDDIO is a separate power supply pin, used for the supply of the digital interface
A power-on reset generator is built in which resets the logic circuitry and the register values
after the power-on sequence. There are no limitations on slope and sequence of raising the VDD
and VDDIO levels. After powering up, the sensor settles in sleep mode (see 3.6.1).
Warning. Holding any interface pin (SDI, SDO, SCK or CSB) at a logical high level when VDDIO is
switched off can permanently damage the device due caused by excessive current flow through
the ESD protection diodes.
If VDDIO is supplied, but VDD is not, the interface pins are kept at a high-Z level. The bus can
therefore already be used freely before the BMP280 VDD supply is established.
3.3 Measurement flow
The BMP280 measurement period consists of a temperature and pressure measurement with
selectable oversampling. After the measurement period, the data are passed through an
optional IIR filter, which removes short-term fluctuations in pressure (e.g. caused by slamming a
door). The flow is depicted in the diagram below.
BST-BMP280-DS001-11 | Revision 1.14 | 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. Not intended for publication.

11 Page







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