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BMP280 数据表(PDF) 21 Page - Bosch Sensortec GmbH |
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BMP280 数据表(HTML) 21 Page - Bosch Sensortec GmbH |
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21 / 49 page  Bosch Sensortec | BMP280 Data sheet 21 | 49 Modifications reserved | Data subject to change without notice Document number: BST-BMP280-DS001-26 Revision_1.26_102021 Table 16: Computational requirements for compensation formulas Compensation of Number of clock cycles (ARM Cortex-M3) 32 bit integer 64 bit integer Double precision Temperature ~46 – ~2400 7 Pressure ~112 8 ~1400 ~5400 7 3.11.2 Trimming parameter readout The trimming parameters are programmed into the devices’ non-volatile memory (NVM) during production and cannot be altered by the customer. Each compensation word is a 16-bit signed or unsigned integer value stored in two’s complement. As the memory is organized into 8-bit words, two words must always be combined in order to represent the compensation word. The 8-bit registers are named calib00…calib25 and are stored at memory addresses 0x88…0xA1. The corresponding compensation words are named dig_T# for temperature compensation related values and dig_P# for pressure compensation related values. The mapping is shown in Table 17. Table 17: Compensation parameter storage, naming and data type Register Address LSB / MSB Register content Data type 0x88 / 0x89 dig_T1 unsigned short 0x8A / 0x8B dig_T2 signed short 0x8C / 0x8D dig_T3 signed short 0x8E / 0x8F dig_P1 unsigned short 0x90 / 0x91 dig_P2 signed short 0x92 / 0x93 dig_P3 signed short 0x94 / 0x95 dig_P4 signed short 0x96 / 0x97 dig_P5 signed short 0x98 / 0x99 dig_P6 signed short 0x9A / 0x9B dig_P7 signed short 0x9C / 0x9D dig_P8 signed short 0x9E / 0x9F dig_P9 signed short 0xA0 / 0xA1 reserved reserved 3.11.3 Compensation formula Please note that it is strongly advised to use the API available from Bosch Sensortec to perform readout and compensation. If this is not wanted, the code below can be applied at the user’s risk. Both pressure and temperature values are expected to be received in 20 bit format, positive, stored in a 32 bit signed integer. The variable t_fine (signed 32 bit) carries a fine resolution temperature value over to the pressure compensation formula and could be implemented as a global variable. 7 Use only recommended for high-level programming languages like Matlab™ or LabVIEW™ 8 Use only recommended for 8-bit micro controllers |
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