AD7380 datasheet(23/31 Pages) AD

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Data Sheet

AD7380/AD7381

Rev. 0 | Page 23 of 31

READING FROM DEVICE REGISTERS

All the registers in the device can be read over the serial interface.

A register read is performed by issuing a register read command

followed by an additional SPI command that can be either a

valid command or NOP. The format for a read command is

shown in Table 14. Bit D15 must be set to 0 to select a read

command. Bits[D14:D12] contain the register address, and the

subsequent twelve bits, Bits[D11:D0], are ignored.

WRITING TO DEVICE REGISTERS

All the read/write registers in the AD7380/AD7381 can be

written to over the serial interface. The length of an SPI write

access is determined by the CRC write function. An SPI access

is 16-bit if CRC write is disabled and is 24-bit when CRC write

is enabled. The format for a write command is shown in Table 15.

Bit D15 must be set to 1 to select a write command. Bits[D14:D12]

contain the register address, and the subsequent twelve bits,

Bits[D11:D0], contain the data to be written to the selected register.

SDI

SDOA

SDOB

RESULT S0

REG 1DATA

REG 2DATA

RESULT S3

INVALID

RESULT S0

INVALID

READ REG 1

READ REG 2

NOP

RESULT S3

Figure 40. Register Read

SDI

SDOA

SDOB

RESULT S0

RESULT S1

RESULT S2

INVALID

WRITE REG 1

WRITE REG 2

NOP

Figure 41. Register Write

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