Data Sheet
Final Datasheet
BME280 Environmental sensor
Page 22
BST-BME280-DS001-10 | Revision 1.1 | May 2015 Bosch Sensortec
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Note: Specifications within this document are subject to change without notice.
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
-volatile memory (NVM) during
production and cannot be altered by the customer. Each compensation word is a 16-bit signed
or unsigned anized into 8-bit
words, two words must always be combined in order to represent the compensation word. The
8- calib41
E7. 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
Register Address
Register content
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
11
Use only recommended for high-level programming languages
12
Use only recommended for 8-bit micro controllers