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AM2320 Folha de dados(PDF) 16 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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AM2320 Folha de dados(HTML) 16 Page - List of Unclassifed Manufacturers

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◎CRC calculation code in C language code
Description: This program to calculate the length len * ptr bytes before the CRC.
unsigned short crc16(unsigned char *ptr, unsigned char len)
{
unsigned short crc =0xFFFF;
unsigned char i;
while(len--)
{
crc ^=*ptr++;
or(i=0;i<8;i++)
{
if(crc & 0x01)
{
crc>>=1;
crc^=0xA001;
}else
{
crc>>=1;
}
}
}
return crc;
}
8.2.4
I
2 C Communication Timing
AM2320 sensor I
2 C communication, although according to the standard I 2 C communication
sequence, but must follow our communication protocols and communication timing requirements, in
order to accurately read the sensor. In strict accordance with the communication protocol and timing,
please read the design.
◎I 2 C Read full Timing Example
Figure 14 shows the read sensor when the full sample and write a special time requirements, in
strict accordance with the requirements of the special time to read and write, otherwise it will appear
unreadable sensors or incorrect data and so on. Several timing diagram special needs attention, the
time requirements detailed in Figure; host communication from beginning to end, for a maximum of
3S.
Figure14: I
2
C sensors read the complete example of fig
- 15 -


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