ADE9178 datasheet(26/122 Pages) AD

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Data Sheet

ADE9178

THEORY OF OPERATION

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Rev. A | 26 of 122

Note that all data including register values for write, read response,

and status are 32-bit values and sent over the SPI as least signifi-

cant byte (LSByte) first as shown in Figure 38.

Figure 38. ADE9178 Data/Response SPI Frame Format

The command header is also a 32-bit field with 24th bit indicates

if the command is read or write. The format for the write and read

command header is shown in Figure 39 and Figure 40, respectively.

Figure 39. Write Command Header

Figure 40. Read Command Header

Table 10. Command Header Details

Field

Description

ADDR

Address of registers, which need to be accessed.

R/W

1: Read.

0: Write.

Device

0: ADE9178.

1: ADC0 − ADC connected to ADC_MISO pin of the

ADE9178.

2: ADC1 − ADC connected to ADC_MOSI pin of

ADC1.

3: ADC2 − ADC connected to ADC_MOSI pin of

ADC2.

4: ADC3 − ADC connected to ADC_MOSI pin of

ADC3.

5: All ADCs.

NUM Registers

Number of registers to be read. The ADE9178 sends

those many registers starting from the address in the

command header. Note that this must be 1 for write

commands. If the device field of the command is not

ADE9178 (0) , NUM_REGISTER field is ignored and

always two 8-bit registers are returned as response.

For more details, see the ADC SPI section.

In case of error, 4 bytes status code is sent as response for read

and write command.

Table 11 shows the status codes that return.

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