SENSIRION SCD4 Series, Manual, Page: 18 / 24

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3.10.3 power_down
Description : Put the sensor from idle to sleep to reduce current consumption. Can be used to power down when operating the
sensor in power-cycled single shot mode.
Table 30 : power_down I
2
C sequence description
Write
(hexadecimal)
Input parameter: - Response parameter: -
Max. command
duration [ms]
length [bytes] signal conversion length [bytes] signal conversion
0x36e0 - - - - 1
Example: power down the sensor
Write 0x36e0
(hexadecimal) Command
3.10.4 wake_up
Description : Wake up the sensor from sleep mode into idle mode. Note that the SCD4x does not acknowledge the wake_up
command. To verify that the sensor is in the idle state after issuing the wake_up command, the serial number can be read out
(chapter 3.9.2). Note that the first reading obtained using measure_single_shot (chapter 3.10.1) after waking up the sensor
should be discarded.
Table 31: wake_up I
2
C sequence description
Write
(hexadecimal)
Input parameter: - Response parameter: -
Max. command
duration [ms]
length [bytes] signal conversion length [bytes] signal conversion
0x36f6 - - - - 20
Example: wake up the sensor
Write 0x36f6
(hexadecimal) Command