Datasheet

BMP280 Digital Pressure Sensor

Page 11

BST-BMP280-DS001-19 | Revision 1.19 | January 2018

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.

3.1 Block diagram

Figure 1 shows a simplified block diagram of the BMP280:

Figure 1: Block diagram of BMP280

3.2 Power management

The BMP280 has two separate power supply pins

A power-on reset generator is built in which resets the logic circuitry and the register values after

switched off can permanently damage the device due caused by excessive current flow through

the ESD protection diodes.

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.

Logic

OSC

NVM

ADC

Pressure/

temperature

sensing

element

Voltage

reference

Voltage

regulator

(analog &

digital)

GND

I

n

t

e

r

f

a

c

e

SDI

SDO

SCK

CSB

POR

Analog

front-end