Os motores de busca de Datasheet de Componentes eletrônicos |
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AM2320 Folha de dados(PDF) 22 Page - List of Unclassifed Manufacturers |
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AM2320 Folha de dados(HTML) 22 Page - List of Unclassifed Manufacturers |
22 / 27 page AM2320 device uses a simplified single-bus communication. Single bus that only one data line, the data exchange system, the control by the data line is completed. Device (microprocessor) through an open-drain or tree-state port is connected to the data line to allow the device when not transmitting data to release the bus, and let other devices use the bus; single bus usually requires an external 5.1kΩof approximately pull-up resistors, so that when the bus is idle, the state is high. Because they are master-slave structure, only when the host calls the sensor, the sensor will be answered, so the host access to the sensor must strictly follow the sequence of a single bus, if there is a sequence of confusion, the sensor will not respond to the host. ◎Single bus transfer data definitions SDA and AM2320 microprocessors for communication and synchronization between using single bus data format, a 40-bit data transfer, high first-out. , The communication format specific communication sequence shown in Figure 20 are shown in Table 9. Figure 20: AM2320 single bus communication protocol Table 9: AM2320 communication format Name Single bus format definition Start signal The microprocessor data bus (SDA) low period (at least 800μs) ] 1 [ , to prepare the data notification sensor Response signal Sensor data bus (SDA) low 80μs, 80μs followed by a high signal in response to the initial host Data Format Upon receipt of the host start signal from the data bus disposable sensor (SDA) string of 40-bit data, the high first-out Humidity Humidity resolution is 16Bit, the previous high; strings out of the humidity sensor is 10 times the actual humidity values. Temperature Temperature resolution is 16Bit, the previous high; sensor string temperature value is 10 times the actual temperature value; 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; In addition to the temperature of the highest bit (Bit14 ~ Bit0) indicates the temperature value. Parity bit Parity bit = humidity high temperature + humidity + high + low temperature low [1] For details, see 7.3 ◎ Single bus data sample calculation Example 1: 40 of the received data: 0000 0010 1001 0010 0000 0001 0000 1101 1010 001 High humidity 8 Low humidity 8 High temperature 8 Low temperature8 Parity bit Calculated as follows: 0000 0010+1001 0010 +0000 0001+0000 1101= 1010 0010 (Parity bit) Receive data is correct: Humidity:0000 0010 1001 0010 = 0292H (hex) = 2×256 + 9× 6 + 2 = 658 => Humidity = 65.8% RH - 21 - |
Nº de peça semelhante - AM2320 |
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Descrição semelhante - AM2320 |
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