We bought a number of BMP388s and they showed bad accuracy and drift in pressure output. I asked customer support for the issue and she found some calibration coefficients in NVM must be wrong. I tried to check the calibration coefficients in NVM using a spread sheet which Bosch customer support gave to us. The result is as below. Calculation of pressure and temperature for BMP388 Input Calibration Parameters Quantization Factor Quantized DO_C 27322 0.00390625 6994432 NVM_PAR_T1 DTK1_C 18880 1073741824 1.758E-05 NVM_PAR_T2 DTK2_C -10 2.81475E+14 -3.553E-14 NVM_PAR_T3 O_C 25371 0.125 202968 NVM_PAR_P5 TK1O_C 30991 64 484.23438 NVM_PAR_P6 TK2O_C -13 256 -0.0507813 NVM_PAR_P7 TK3O_C -10 32768 -0.0003052 NVM_PAR_P8 S_C 395 1048576 -0.0152483 NVM_PAR_P1 TK1S_C -2608 536870912 -3.538E-05 NVM_PAR_P2 TK2S_C 35 4294967296 8.149E-09 NVM_PAR_P3 TK3S_C 0 1.37439E+11 0 NVM_PAR_P4 NSL_C 16342 2.81475E+14 5.806E-11 NVM_PAR_P9 TKNLS_C 29 2.81475E+14 1.03E-13 NVM_PAR_P10 NLS3_C -60 3.68935E+19 -1.626E-18 NVM_PAR_P11 24 Bit 21 Bit ADCT 9543040 ADCP 8652032 1081504 calculated Read Temp 44.58235492 [°C] 44.582 [°C] p 82631.0904 [Pa] 826.311 [hPa] The symptom is mostly the same in all BMP388 that we bought. We thought that correction of wrong parameters above would improve the accuracy of sensing air presure but Bosch sensortec said they would not support for the issue anymore. Does anyone find an incorrect parameter on this spread sheet? Does anyone know how to derive correct calibration coefficients for each BMP388? Thank you very much in advance.
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