Datasheet

BMP280 Digital Pressure Sensor

Page 26

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

Bosch Sensortec

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Note: Specifications within this document are subject to change without notice. Not intended for publication.

Table 22: register settings osrs_t

osrs_t[2:0]

Temperature oversampling

000

Skipped (output set to 0x80000)

001

oversampling ×1

010

oversampling ×2

011

oversampling ×4

100

oversampling ×8

101, 110, 111

oversampling ×16

4.3.5 Register 0xF5 “config”

The “config” register sets the rate, filter and interface options of the device. Writes to the “config”

register in normal mode may be ignored. In sleep mode writes are not ignored.

Table 23: Register 0xF5 “config”

Register 0xF5

“config”

Name

Description

Bit 7, 6, 5

t_sb[2:0]

chapter 3.6.3 for details.

Bit 4, 3, 2

filter[2:0]

Controls the time constant of the IIR filter. See chapter

3.3.3 for details.

Bit 0

spi3w_en[0]

Enables 3-wire SPI interface when set to ‘1’. See

chapter 5.3 for details.

4.3.6 Register 0xF7…0xF9 “press” (_msb, _lsb, _xlsb)

The “press” register contains the raw pressure measurement output data up[19:0]. For details on

how to read out the pressure and temperature information from the device, please consult

chapter3.9.

Table 24: Register 0xF7 … 0xF9 “press”

Register 0xF7-0xF9

“press”

Name

Description

0xF7

press_msb[7:0]

Contains the MSB part up[19:12] of the raw pressure

measurement output data.

0xF8

press_lsb[7:0]

Contains the LSB part up[11:4] of the raw pressure

measurement output data.

0xF9 (bit 7, 6, 5, 4)

press_xlsb[3:0]

Contains the XLSB part up[3:0] of the raw pressure

measurement output data. Contents depend on

temperature resolution, see table 5.