BMP280 datasheet(11/49 Pages) BOSCH

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Bosch Sensortec | BMP280 Data sheet

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Modifications reserved | Data subject to change without notice

Document number: BST-BMP280-DS001-26 Revision_1.26_102021

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

•

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.

Logic

OSC

NVM

ADC

Pressure/

temperature

sensing

element

Voltage

reference

Voltage

regulator

(analog &

digital)

VDDIO

GND

SDI

SDO

SCK

CSB

VDD

POR

Analog

front-end

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