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BMP280 Datasheet(PDF) 46 Page - Bosch Sensortec GmbH |
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BMP280 Datasheet(HTML) 46 Page - Bosch Sensortec GmbH |
46 / 49 page ![]() Datasheet BMP280 Digital Pressure Sensor Page 46 BST-BMP280-DS001-19 | Revision 1.19 | January 2018 Bosch Sensortec © Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany. Note: Specifications within this document are subject to change without notice. Not intended for publication. BMP280_S32_t var1, var2, T; var1 = ((((adc_T>>3) – ((BMP280_S32_t)dig_T1<<1))) * ((BMP280_S32_t)dig_T2)) >> 11; var2 = (((((adc_T>>4) – ((BMP280_S32_t)dig_T1)) * ((adc_T>>4) – ((BMP280_S32_t)dig_T1))) >> 12) * ((BMP280_S32_t)dig_T3)) >> 14; t_fine = var1 + var2; T = (t_fine * 5 + 128) >> 8; return T; } // Returns pressure in Pa as unsigned 32 bit integer. Output value of “96386” equals 96386 Pa = 963.86 hPa BMP280_U32_t bmp280_compensate_P_int32(BMP280_S32_t adc_P) { BMP280_S32_t var1, var2; BMP280_U32_t p; var1 = (((BMP280_S32_t)t_fine)>>1) – (BMP280_S32_t)64000; var2 = (((var1>>2) * (var1>>2)) >> 11 ) * ((BMP280_S32_t)dig_P6); var2 = var2 + ((var1*((BMP280_S32_t)dig_P5))<<1); var2 = (var2>>2)+(((BMP280_S32_t)dig_P4)<<16); var1 = (((dig_P3 * (((var1>>2) * (var1>>2)) >> 13 )) >> 3) + ((((BMP280_S32_t)dig_P2) * var1)>>1))>>18; var1 =((((32768+var1))*((BMP280_S32_t)dig_P1))>>15); if (var1 == 0) { return 0; // avoid exception caused by division by zero } p = (((BMP280_U32_t)(((BMP280_S32_t)1048576)-adc_P)-(var2>>12)))*3125; if (p < 0x80000000) { p = (p << 1) / ((BMP280_U32_t)var1); } else { p = (p / (BMP280_U32_t)var1) * 2; } var1 = (((BMP280_S32_t)dig_P9) * ((BMP280_S32_t)(((p>>3) * (p>>3))>>13)))>>12; var2 = (((BMP280_S32_t)(p>>2)) * ((BMP280_S32_t)dig_P8))>>13; p = (BMP280_U32_t)((BMP280_S32_t)p + ((var1 + var2 + dig_P7) >> 4)); return p; } |
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