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SCD40-D-R1 数据表(PDF) 13 Page - Sensirion AG Switzerland |
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SCD40-D-R1 数据表(HTML) 13 Page - Sensirion AG Switzerland |
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13 / 22 page ![]() www.sensirion.com Version 1.1 – April 2021 13/22 Table 18: perform_forced_recalibration I2C sequence description Write (hexadecimal) Input parameter: Target CO2 concentration Response parameter: FRC-correction Max. command duration [ms] length [bytes] signal conversion length [bytes] signal conversion 0x362f 3 word[0] = Target concentration [ppm CO2] 3 FRC correction [ppm CO2] = word[0] – 0x8000 word[0] = 0xffff in case of failed FRC 400 Example: perform forced recalibration, reference CO2 concentration is 490 ppm Write 0x362f 0x01e0 0xb4 (hexadecimal) Command Input: 480 ppm CRC of 0x01e0 Wait 400 ms command execution time Response 0x7fce 0x7b (hexadecimal) Response: - 50 ppm CRC of 0x7fce 3.7.2 s et_automatic_self_calibration_enabled Description: Set the current state (enabled / disabled) of the automatic self-calibration. By default, ASC is enabled. To save the setting to the EEPROM, the persist_setting (see chapter 3.9.1) command must be issued. Table 19: set_automatic_self_calibration_enabled I2C sequence description. Write (hexadecimal) Input parameter: ASC enabled Response parameter: - Max. command duration [ms] length [bytes] signal conversion length [bytes] signal conversion 0x2416 3 word[0] = 1 → ASC enabled word[0] = 0 → ASC disabled - - 1 Example: set automatic self-calibration status: enabled Write 0x2416 0x0001 0xB0 (hexadecimal) Command ASC enabled CRC of 0x0001 3.7.3 get_automatic_self_calibration_enabled Table 20: get_automatic_self_calibration_enabled I2C sequence description Write (hexadecimal) Input parameter: - Response parameter: ASC enabled Max. command duration [ms] length [bytes] signal conversion length [bytes] signal conversion 0x2313 - - 3 word[0] = 1 → ASC enabled word[0] = 0 → ASC disabled 1 Example: read automatic self-calibration status: disabled Write 0x2313 (hexadecimal) Command Wait 1 ms command execution time Response 0x0000 0x81 (hexadecimal) ASC disabled CRC of 0x0000 |
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