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3.4 SCD4x Command Overview

Table 9: List of SCD4x sensor commands. Detailed description of SCD4x commands can be found

further down. *Column indicates whether command can be executed while a periodic measurement

is running.

Domain

Command

Hex.

Code

(see chapter 3.3)

Execution

time

[ms]

During

meas.*

Basic Commands

Chapter 3.5

start_periodic_measurement

0x21b1

send command

-

no

read_measurement

0xec05

read

1

yes

stop_periodic_measurement

0x3f86

send command

500

yes

On-chip output signal

compensation

Chapter 3.6

set_temperature_offset

0x241d

write

1

no

get_temperature_offset

0x2318

read

1

no

set_sensor_altitude

0x2427

write

1

no

get_sensor_altitude

0x2322

read

1

no

set_ambient_pressure

0xe000

write

1

yes

Field calibration

Chapter 3.7

perform_forced_recalibration

0x362f

send command and

fetch result

400

no

set_automatic_self_calibration_enabled

0x2416

write

1

no

get_automatic_self_calibration_enabled

0x2313

read

1

no

Low power

Chapter 3.8

start_low_power_periodic_measurement

0x21ac

send command

-

no

get_data_ready_status

0xe4b8

read

1

yes

Advanced features

Chapter 3.9

persist_settings

0x3615

send command

800

no

get_serial_number

0x3682

read

1

no

perform_self_test

0x3639

read

10000

no

perform_factory_reset

0x3632

send command

1200

no

reinit

0x3646

send command

20

no

Low power single shot

(SCD41 only) Chapter 3.10

measure_single_shot

0x219d

send command

5000

no

measure_single_shot_rht_only

0x2196

send command

50

no