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SCD40-D-R2 bảng dữ liệu(PDF) 13 Page - Sensirion AG Switzerland

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Giải thích chi tiết về linh kiện  Breaking the size barrier in CO2 sensing
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nhà sản xuất  SENSIRION [Sensirion AG Switzerland]
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SCD40-D-R2 bảng dữ liệu(HTML) 13 Page - Sensirion AG Switzerland

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Version 1.1 – April 2021
13/22
Table 18: perform_forced_recalibration I2C sequence description
Write
(hexadecimal)
Input parameter: Target CO2 concentration
Response parameter: FRC-correction
Max.
command
duration [ms]
length [bytes]
signal conversion
length [bytes]
signal conversion
0x362f
3
word[0] = Target
concentration [ppm CO2]
3
FRC correction [ppm CO2] =
word[0] – 0x8000
word[0] = 0xffff in case of
failed FRC
400
Example: perform forced recalibration, reference CO2 concentration is 490 ppm
Write
0x362f
0x01e0
0xb4
(hexadecimal)
Command
Input: 480 ppm
CRC of 0x01e0
Wait
400 ms
command execution time
Response
0x7fce
0x7b
(hexadecimal)
Response: - 50 ppm
CRC of 0x7fce
3.7.2
s
et_automatic_self_calibration_enabled
Description: Set the current state (enabled / disabled) of the automatic self-calibration. By default, ASC is enabled. To save the
setting to the EEPROM, the persist_setting (see chapter 3.9.1) command must be issued.
Table 19: set_automatic_self_calibration_enabled I2C sequence description.
Write
(hexadecimal)
Input parameter: ASC enabled
Response parameter: -
Max. command
duration [ms]
length [bytes]
signal conversion
length [bytes]
signal conversion
0x2416
3
word[0] = 1 → ASC enabled
word[0] = 0 → ASC disabled
-
-
1
Example: set automatic self-calibration status: enabled
Write
0x2416
0x0001
0xB0
(hexadecimal)
Command
ASC enabled
CRC of 0x0001
3.7.3
get_automatic_self_calibration_enabled
Table 20: get_automatic_self_calibration_enabled I2C sequence description
Write
(hexadecimal)
Input parameter: -
Response parameter: ASC enabled
Max. command
duration [ms]
length [bytes]
signal conversion
length [bytes]
signal conversion
0x2313
-
-
3
word[0] = 1 → ASC enabled
word[0] = 0 → ASC disabled
1
Example: read automatic self-calibration status: disabled
Write
0x2313
(hexadecimal)
Command
Wait
1 ms
command execution time
Response
0x0000
0x81
(hexadecimal)
ASC disabled
CRC of 0x0000



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