Datasheet

BMP280 Digital Pressure Sensor

Page 24

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.

4. Global memory map and register description

4.1 General remarks

All communication with the device is performed by reading from and writing to registers. Registers

have a width of 8 bits. There are several registers which are reserved; they should not be written

to and no specific value is guaranteed when they are read. For details on the interface, consult

chapter 5.

4.2 Memory map

The memory map is given in Table 18 below. Reserved registers are not shown.

Table 18: Memory map

Register Name

Address

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

Reset

state

temp_xlsb

0xFC

0

0

0

0

0x00

temp_lsb

0xFB

0x00

temp_msb

0xFA

0x80

press_xlsb

0xF9

0

0

0

0

0x00

press_lsb

0xF8

0x00

press_msb

0xF7

0x80

config

0xF5

spi3w_en[0]

0x00

ctrl_meas

0xF4

0x00

status

0xF3

measuring[0]

im_update[0]

0x00

reset

0xE0

0x00

id

0xD0

0x58

calib25...calib00

0xA1…0x88

individual

Registers:

Reserved

registers

Calibration

data

Control

registers

Data

registers

Status

registers

Revision

Reset

Type:

do not

write

read only

read / write

read only

read only

read only

write only

calibration data

press_xlsb<7:4>

temp_xlsb<7:4>

temp_lsb<7:0>

temp_msb<7:0>

chip_id[7:0]

osrs_t[2:0]

reset[7:0]

press_lsb<7:0>

press_msb<7:0>

mode[1:0]

t_sb[2:0]

filter[2:0]

osrs_p[2:0]

4.3 Register description

4.3.1 Register 0xD0 “id”

The “id” register contains the chip identification number chip_id[7:0], which is 0x58. This number

can be read as soon as the device finished the power-on-reset.

4.3.2 Register 0xE0 “reset”

The “reset” register contains the soft reset word reset[7:0]. If the value 0xB6 is written to the

register, the device is reset using the complete power-on-reset procedure. Writing other values

than 0xB6 has no effect. The readout value is always 0x00.