Datasheet

BMP280 Digital Pressure Sensor

Page 30

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

Bosch Sensortec

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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.

Start

RW ACKS

ACKS

1

1

1

0

1

1

X

0

1

1

1

1

0

1

1

0

Start

RW ACKS

ACKM

NOACKM Stop

1

1

1

0

1

1

X

1

bit7

bit6

bit5

bit4

bit3

bit2

bit1 bit0

bit7

bit6 bit5 bit4 bit3 bit2 bit1 bit0

Control byte

Data byte

Data byte

Register address (F6h)

S

Slave Address

P

S

Slave Address

Register data - address F7h

Register data - address F6h

Figure 8: I²C multiple byte read

5.3 SPI interface

The SPI interface is compatible with SPI mode ‘00’ (CPOL = CPHA = ‘0’) and mode ‘11’ (CPOL

= CPHA = ‘1’). The automatic selection between mode ‘00’ and ‘11’ is determined by the value of

SCK after the CSB falling edge.

The SPI interface has two modes: 4-wire and 3-wire. The protocol is the same for both. The 3-

wire mode is selected by setting ‘1’ to the register spi3w_en. The pad SDI is used as a data pad

in 3-wire mode.