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AM2320 Datasheet(PDF) 13 Page - List of Unclassifed Manufacturers

Part No. AM2320
Description  Digital Temperature and Humidity Sensor
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Maker  ETC2 [List of Unclassifed Manufacturers]
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Retention
0x05
Device ID
(24-31) Bit
0x0D
Retention
0x15
Retention
0x1D
Retention
0x06
Device ID
(24-31) Bit
0x0E
Retention
0x16
Retention
0x1E
Retention
0x07
Status
Register
0x0F
Retention
0x17
Retention
0x1F
ā—ŽTemperature output format
Temperature resolution is 16Bit, temperature highest bit (Bit15) is equal to 1 indicates a
negative temperature, the temperature highest bit (Bit15) is equal to 0 indicates a positive
temperature; temperature in addition to the most significant bit (Bit14 ~ Bit0) indicates the
temperature sensor string value. Temperature sensor value is a string of 10 times the actual
temperature value.
ā—ŽStatus Register
Status Register, Bit7-Bit0 bit, temporarily reserved
Status
register
bits
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Features
Retention
Retention
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Retention
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ā—ŽI 2 C Mod Bus Function Code Description
1. Function code "03": Read registers multiplexed sensor
The host sends reading frame formatļ¼š
START + (I
2 C address + W) + function code (0x03) + start address + number of registers
+ STOP
Host read return data:
START + (I
2 C address + R) + sequential read sensor data returned + STOP
Sensor response frame format:
Function code (0x03) + number + data +CRC
]
1
[
For example: Host sequential read sensor data: the starting address for the register data of four
sensors 0x00.
Sensor data register address and data:
Register Address
Register data
Data Description
Register Address
Register data
Data Description
0x00
0x01
High humidity
0x02
0x00
High temperature
0x01
0XF4
Low humidity
0x03
0xFA
Low temperature
Host message format sent:
The host sends
Byte count
Transmitting information
Remarks
Sensor address
1
0xB8
Sensor C address (0xB8) + W (0)
Function Code
1
0x03
Read register
Starting address
1
0x00
Register start address is 0x00
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