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ADE9178 数据表(PDF) 29 Page - Analog Devices |
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ADE9178 数据表(HTML) 29 Page - Analog Devices |
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29 / 122 page  Data Sheet ADE9178 THEORY OF OPERATION analog.com Rev. A | 29 of 122 Support for Reading and Writing ADC Registers The ADE9178 provides support for reading and writing ADC regis- ters by configuring the device field of the command. If the device is a nonzero value less than 5, the read or write command is sent to corresponding ADC. If the device field is 5, the same command is sent to all ADCs in the daisy chain. ADC reads return two 8-bit values, the value at the address in the command header and the value at the consecutive address. See Table 10 to relate ADC number to physical ADC channel, for example, ADC1 relates to the ADC that is connected to the ADC_MISO pin of the ADE9178. For single ADC write, the protocol is the same as shown in Figure 34 except the register value in the Command Header and the Register Value is stored in the lower 8 bits of the 32-bit register (upper 24 bits are 0 padded). For multiple ADC write, it is important to note that the same register value is written to all ADCs and depending on how many ADCs are connected to ADE9178 the response size changes. Figure 41. Protocol to Read ADC Registers Individually Figure 42. Protocol to Read ADC Registers Simultaneously (NUM_ADC = 0x1) |
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