AD7689配置字节和通道字节
时间: 2023-07-29 15:11:55 浏览: 368
AD7689是一款16位的模数转换器(ADC),使用SPI接口进行通信。下面是AD7689的配置字节和通道字节的说明:
AD7689的配置字节(Config Byte)用于设置ADC的工作模式和采样速率等参数。配置字节的格式如下:
```
Bit 15: D15 (Always set to 1)
Bit 14: D14 (Always set to 0)
Bit 13: D13 (Always set to 0)
Bit 12: D12 (Always set to 0)
Bit 11: D11 (Always set to 0)
Bit 10: D10 (Always set to 0)
Bit 9: D9 (Always set to 0)
Bit 8: D8 (Always set to 0)
Bit 7: D7 (Always set to 0)
Bit 6: D6 (Always set to 0)
Bit 5: D5 (Always set to 0)
Bit 4: B2
Bit 3: B1
Bit 2: B0
Bit 1: B/!C
Bit 0: !C/!D
```
- B2, B1, B0(Bit 4-2)用于设置ADC的输入缓冲器模式、参考电压模式和功耗模式。
- B/!C(Bit 1)用于选择双极性(B)或单极性(!C)输入模式。
- !C/!D(Bit 0)用于选择单端输入(!C)或差分输入(!D)模式。
AD7689的通道字节(Channel Byte)用于选择要转换的输入通道。通道字节的格式如下:
```
Bit 15: D15 (Always set to 1)
Bit 14: D14 (Always set to 1)
Bit 13: D13 (Always set to 1)
Bit 12: D12 (Always set to 0)
Bit 11: D11 (Channel Selection Bit 2)
Bit 10: D10 (Channel Selection Bit 1)
Bit 9: D9 (Channel Selection Bit 0)
Bit 8: D8 (Always set to 0)
Bit 7: D7 (Always set to 0)
Bit 6: D6 (Always set to 0)
Bit 5: D5 (Always set to 0)
Bit 4: D4 (Always set to 0)
Bit 3: D3 (Always set to 0)
Bit 2: D2 (Always set to 0)
Bit 1: D1 (Always set to 0)
Bit 0: D0 (Always set to 0)
```
- Channel Selection Bit 2-0(Bit 11-9)用于选择转换的输入通道。根据具体的AD7689芯片配置,可以选择不同的输入通道。
根据AD7689的配置字节和通道字节格式,你可以根据需要设置对应的位来配置AD7689的工作模式和选择转换的输入通道。
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