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AM2320 Folha de dados(PDF) 12 Page - List of Unclassifed Manufacturers

Nome de Peças AM2320
Descrição Electrónicos  Digital Temperature and Humidity Sensor
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Fabricante Electrônico  ETC2 [List of Unclassifed Manufacturers]
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accordance with the function codes and requirements; then the results (data) is sent back to the host.
The information returned includes the function code, and after execution of the data CRC code (the
user may read the CRC, can be sent directly to a stop condition).
◎Communication slave address
AM2320 sensors each address are the same, and is 0xB8. So on the same bus can only hang the
AM2320 sensors, sensor signal only after receiving the start and with itself will respond to the same
address.
◎Communication I 2 C function code
Function code is the first byte of each communication message frame transmission. I
2 C-Mod
Bus communication rules, define the function code is 1-127. As host requests sent by function code
tells the slave what action should be performed. As a slave response, the slave returns the function
code sent from the host to the function code, as it indicates that the response from the host machine
and have been related operations. I
2 C-Mod Bus part of the function codes are listed in Table 7.
Table 7:C Mod Bus part of the function code
Function Code
Definitions
Operation (binary)
0x03
Reading Register Data
Read one or more data registers
0x10
Write Multiple Registers
Multiple sets of binary data to write multiple registers
◎C communication data area
The data area includes required by the sensor returns what information or what action to
perform. This information may be data (such as: temperature, humidity, the sensor device
information, the user writes data, etc.), the reference address. For example, function code 03 tells the
host through the register value returned by the sensor (including the start address of the register to be
read and the read length register), the returned data comprises data length and the content of the
register data register.
Sensor uses a custom I
2 C -Mod bus communication protocol used by the master
communication command (function code 03), which could be read its data register, the data register
table in Table 8. Sensor data register stores the temperature and humidity values and the
corresponding sensor device information and other related signals; each data register is a single byte
(8 bits) of binary data; once read data up to 10 sensor registers more than read length, the sensor will
return the corresponding error code. The error code information, see Schedule 1.
Table 8: AM2320 Data Register Table
Register
information
Address
Register
information
Address
Register information
Address
Register
information
Address
High humidity
0x00
Model High
0x08
Users register a high
0x10
Retention
0x18
Low humidity
0x01
Model Low
0x09
Users register a low
0x11
Retention
0x19
High temperature
0x02
The version
number
0x0A
Users register 2 high
0x12
Retention
0x1A
Low temperature
0x03
Device ID
(24-31) Bit
0x0B
Users register 2 low
0x13
Retention
0x1B
Retention
0x04
Device ID
(24-31) Bit
0x0C
Retention
0x14
Retention
0x1C
- 11 -


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