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Modifications reserved | Data subject to change without notice

Document number: BST-BME280-DS001-23 Revision_1.23_012022

Table 15: Computational requirements for compensation formulas

Compensation of

Number of clocks (ARM Cortex-M3)

32 bit integer

64 bit integer

Double precision

Humidity

~83

–

~2900 11

Temperature

~46

–

~2400 11

Pressure

~112 12

~1400

~5400 11

4.2.2

Trimming parameter readout

The trimming parameters are programmed into the devices’ non-volatile memory (NVM) during

production and cannot be altered by the customer. Each compensation word is a 16-bit signed or

unsigned integer value stored in two’s complement. As the memory is organized into 8-bit words, two

words must always be combined in order to represent the compensation word. The 8-bit registers are

named calib00…calib41 and are stored at memory addresses 0x88…0xA1 and 0xE1…0xE7. The

corresponding compensation words are named dig_T# for temperature compensation related values,

dig_P# for pressure related values and dig_H# for humidity related values. The mapping is seen in

Table 16.

Table 16: Compensation parameter storage, naming and data type

Data type

0x88 / 0x89

dig_T1 [7:0] / [15:8]

unsigned short

0x8A / 0x8B

dig_T2 [7:0] / [15:8]

signed short

0x8C / 0x8D

dig_T3 [7:0] / [15:8]

signed short

0x8E / 0x8F

dig_P1 [7:0] / [15:8]

unsigned short

0x90 / 0x91

dig_P2 [7:0] / [15:8]

signed short

0x92 / 0x93

dig_P3 [7:0] / [15:8]

signed short

0x94 / 0x95

dig_P4 [7:0] / [15:8]

signed short

0x96 / 0x97

dig_P5 [7:0] / [15:8]

signed short

0x98 / 0x99

dig_P6 [7:0] / [15:8]

signed short

0x9A / 0x9B

dig_P7 [7:0] / [15:8]

signed short

0x9C / 0x9D

dig_P8 [7:0] / [15:8]

signed short

0x9E / 0x9F

dig_P9 [7:0] / [15:8]

signed short

0xA1

dig_H1 [7:0]

unsigned char

0xE1 / 0xE2

dig_H2 [7:0] / [15:8]

signed short

0xE3

dig_H3 [7:0]

unsigned char

0xE4 / 0xE5[3:0]

dig_H4 [11:4] / [3:0]

signed short

0xE5[7:4] / 0xE6

dig_H5 [3:0] / [11:4]

signed short

Use only recommended for high-level programming languages like Matlab™ or LabVIEW™

Use only recommended for 8-bit micro controllers

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