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version 1.0 – December 2021

16/22

Byte number

Description

Value

0, 1

two bytes

0xXX 0xYY: ignore most significant byte 0xXX. The four least

significant bits of the least significant byte 0xYY provide

information if the self-test has or has not passed for each

individual pixel:

bit

3

2

1

0

ignore

ignore

VOC pixel

Possible results for each bit:

0: all tests passed successfully

1: one or more tests have failed

2

CRC byte for bytes 0, 1

–

Turn Heater off and Return to Idle Mode

Command

Command hex. code

Description

sgp4x_turn_heater_off

0x36 0x15

This command turns the hotplate off and stops the measurement.

Subsequently, the sensor enters the idle mode.

Read out The Sensor Serial Number

Command

Command hex. code

Description

sgp4x_get_serial_number

0x36 0x82

This command provides the decimal serial number of the SGP41

chip by returning 3x2 bytes (+ 1 CRC byte).

Byte number

Description

Value

0, 1

two bytes

First (i.e., most significant) and second byte of the serial number.

2

CRC byte for bytes 0, 1

–

3, 4

two bytes

Third and fourth byte of the serial number.

5

CRC byte for bytes 3, 4

–

6, 7

two bytes

Fifth and sixth (i.e., least significant) byte of the serial number.

8

CRC byte for bytes 6, 7

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