bmp280 datasheet

Bosch
Sensortec | BMP280 Data sheet
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Modifications reserved | Data subject to change without notice
Document number: BST-BMP280-DS001-23 Revision_1.23_11202
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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.