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version 1.0 – December 2021

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Conditioning

Command

Command hex. code

Description

sgp41_execute_conditioning

0x26 0x12 0x80 0x00 0xA2 0x66

0x66 0x93

This command starts the conditioning, i.e., the VOC pixel will be

operated at the same temperature as it is by calling the

be operated at a different temperature for conditioning. This

command returns only the measured raw signal of the VOC pixel

SRAW_VOC as 2 bytes (+ 1 CRC byte).

Byte number

Description

Value

0, 1

two bytes

u16 unsigned integer directly provides the raw signal

SRAW_VOC in ticks which is proportional to the logarithm of the

resistance of the sensing element.

2

CRC byte for bytes 0, 1

–

Measure Raw Signals

Command

Subcommand

Command hex. code

Description

sgp41_measure_raw_signals Without humidity

compensation

0x26 0x19 0x80 0x00 0xA2

0x66 0x66 0x93

measurement

mode,

leaves

humidity

compensation disabled by sending the default

values (see Table 12) and returns the measured

raw signals SRAW_VOC and SRAW_NOX as 2x2

bytes (+ 1 CRC byte).

With humidity

compensation

0x26 0x19 0xXX 0xXX 0xXX

0xYY 0xYY 0xYY

In order to enable the humidity compensation, the

master has to specify the relative humidity 0xXX

0xXX 0xXX and temperature 0xYY 0xYY 0xYY

input (incl. corresponding CRC bytes) in the format

as given in Table 12.