BME688 datasheet(24/60 Pages) BOSCH

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Modifications reserved |Data subject to change without notice | Printed in Germany

Document number: BST-BME688-DS000-03 Revision_1.3 022024

Floating point:

var1 = ((double)t_fine / 2.0) - 64000.0;

var2 = var1 * var1 * ((double)par_p6 / 131072.0);

var2 = var2 + (var1 * (double)par_p5 * 2.0);

var2 = (var2 / 4.0) + ((double)par_p4 * 65536.0);

var1 = ((((double)par_p3 * var1_p * var1) / 16384.0) +

((double)par_p2 * var1_p)) / 524288.0;

var1 = (1.0 + (var1 / 32768.0)) * (double)par_p1;

press_comp = 1048576.0 - (double)press_adc;

press_comp = ((press_comp - (var2_p / 4096.0)) * 6250.0) / var1;

var1 = ((double)par_p9 * press_comp * press_comp) / 2147483648.0;

var2 = press_comp * ((double)par_p8 / 32768.0);

var3 = (press_comp / 256.0) * (press_comp / 256.0) *

(press_comp / 256.0) * (par_p10 / 131072.0);

press_comp = press_comp + (var1_p + var2_p + var3_p +

((double)par_p7 * 128.0)) / 16.0;

Integer:

var1 = ((int32_t)t_fine >> 1) - 64000;

var2 = ((((var1 >> 2) * (var1 >> 2)) >> 11) * (int32_t)par_p6) >> 2;

var2 = var2 + ((var1 * (int32_t)par_p5) << 1);

var2 = (var2 >> 2) + ((int32_t)par_p4 << 16);

var1 = (((((var1 >> 2) * (var1 >> 2)) >> 13) *

((int32_t)par_p3 << 5)) >> 3) + (((int32_t)par_p2 * var1) >> 1);

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, see 5.3.5.1

 press_comp is the compensated pressure output data in Pascal.

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