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Modifications reserved |Data subject not change without notice | Printed in Germany

Document number: BST-BME680-DS001-09 Revision_1.9_022024

var1 = var1 >> 18;

var1 = ((32768 + var1) * (int32_t)par_p1) >> 15;

press_comp = 1048576 - press_raw;

press_comp = (uint32_t)((press_comp - (var2 >> 12)) * ((uint32_t)3125));

if (press_comp >= (1 << 30))

press_comp = ((press_comp / (uint32_t)var1) << 1);

else

press_comp = ((press_comp << 1) / (uint32_t)var1);

var1 = ((int32_t)par_p9 * (int32_t)(((press_comp >> 3) *

(press_comp >> 3)) >> 13)) >> 12;

var2 = ((int32_t)(press_comp >> 2) * (int32_t)par_p8) >> 13;

var3 = ((int32_t)(press_comp >> 8) * (int32_t)(press_comp >> 8) *

(int32_t)(press_comp >> 8) * (int32_t)par_p10) >> 17;

press_comp = (int32_t)(press_comp) +

((var1 + var2 + var3 + ((int32_t)par_p7 << 7)) >> 4);

where

•

par_p1, par_p2, …, par_p10 are calibration parameters,

•

press_adc is the raw pressure output data,

•

press_comp is the compensated pressure output data in Pascal.

Table 12: Variable names and register addresses for press_comp calculation

Variable name

par_p1

0x8E / 0x8F

par_p2

0x90 / 0x91

par_p3

0x92

par_p4

0x94 / 0x95

par_p5

0x96 / 0x97

par_p6

0x99

par_p7

0x98

par_p8

0x9C / 0x9D

par_p9

0x9E / 0x9F

par_p10

0xA0

press_adc

0x21<7:4> / 0x20 / 0x1F

3.3.3 Humidity measurement

The humidity measurement can be enabled or skipped. When enabled, several oversampling options exist. The humidity

measurement is controlled by the osrs_h<2:0> setting, which is described in detail in Section 5.3.2.1. For the humidity

measurement, oversampling is possible to reduce noise. The resolution of the humidity measurement is fixed at 16 bit ADC

output.

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