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SCD40-D-R2 数据表(PDF) 11 Page - Sensirion AG Switzerland |
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SCD40-D-R2 数据表(HTML) 11 Page - Sensirion AG Switzerland |
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11 / 22 page ![]() www.sensirion.com Version 1.1 – April 2021 11/22 3.6.2 get_temperature_offset Table 14: get_temperature_offset I2C sequence description Write (hexadecimal) Input parameter: - Response parameter: Offset temperature Max. command duration [ms] length [bytes] signal conversion length [bytes] signal conversion 0x2318 - - 3 Toffset [°C] = 175 * word[0] / 216 1 Example: temperature offset is 6.2 °C Write 0x2318 (hexadecimal) Command Wait 1 ms command execution time Response 0x0912 0x63 (hexadecimal) Toffset = 6.2 °C CRC of 0x0912 3.6.3 s et_sensor_altitude Description : Reading and writing of the sensor altitude must be done while the SCD4x is in idle mode. Typically, the sensor altitude is set once after device installation. To save the setting to the EEPROM, the persist setting (see chapter 3.9.1) command must be issued. Per default, the sensor altitude is set to 0 meter above sea-level . Table 15: set_sensor_altitude I2C sequence description Write (hexadecimal) Input parameter: Sensor altitude Response parameter: - Max. command duration [ms] length [bytes] signal conversion length [bytes] signal conversion 0x2427 3 word[0] = Sensor altitude [m] - - 1 Example: set sensor altitude to 1’950 m.a.s.l. Write 0x2427 0x079e 0x09 (hexadecimal) Command Sensor altitude = 1’950 m CRC of 0x79e 3.6.4 get_sensor_altitude Table 16: get_sensor_altitude I2C sequence description Write (hexadecimal) Input parameter: - Response parameter: Sensor altitude Max. command duration [ms] length [bytes] signal conversion length [bytes] signal conversion 0x2322 - - 3 Sensor altitude [m] = word[0] 1 Example: sensor altitude is 1’100 m.a.s.l. Write 0x2322 (hexadecimal) Command Wait 1 ms command execution time Response 0x044c 0x42 (hexadecimal) Sensor altitude = 1’100 m CRC of 0x044c |
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