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AM2320 Datasheet(PDF) 14 Page - List of Unclassifed Manufacturers |
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AM2320 Datasheet(HTML) 14 Page - List of Unclassifed Manufacturers |
14 / 27 page Sensor response message format returned: Numerical calculation: From the temperature and humidity sensor value is read back, as long as the value into decimal number 10 is divided by the corresponding values of temperature and humidity, corresponding temperature unit ℃, humidity unit is% RH. Such as the above data read back: Humidity: 01F4 = 1×256+15×16+4 =500 => humidity = 500÷10=50.0%RH; Temperature: 00FA= 15×16+10 = 250 => temperature = 250÷10 = 25.0℃ Note: CRC verification code calculated by the CRC code drawn, then the sensor on the transmission of CRC codes ratio; same, then that data is received correctly, otherwise that data has errors. 2. Function code "10": Write multiple registers to sensor Host code can use this feature to save multiple data storage sensor. Single AM2320 sensor register is a byte, or 8 bits. Sensor allows you to save a maximum of 10 data registers. Thus, the single most host to the sensor to save up to 10 registers. Over 10, the sensor will return the corresponding error code. The host sends the write frame format: START + (I 2 C address + W) + function code (0x10) + start address register number + save data + CRC + STOP The host reads the confirmation instruction: START + (I 2 C address + R) + read sensor data returned + STOP Sensor response frame format: Function code (0x10) + start address + number + CRC register For example: The host should be saved to address 10,11 ,01,02 sensors to register. 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 0x10 Write Multiple Registers Starting address 1 0x10 Start address of the register to be written Number of registers 1 0x04 Read the number of register Slave response Byte count Transmitting information Remarks Function Code 1 0x03 Read register Returns the number of bytes 1 0x04 Returns 4 of 4 byte register Register 1 1 0x01 Address for the content of 0x00 (high humidity bytes) Register 2 1 0XF4 Address for the content of 0x01 (low humidity bytes) Register 3 1 0x00 Address for the content of 0x01 (low humidity bytes) Register 4 1 0XFA Address for the content 0x03 (temperature low byte) CRC code 2 31A5 Sensors calculate the CRC code returned, low byte first; - 13 - |
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