AD4682 datasheet(23/30 Pages) AD

23 / 30 page

Data Sheet

AD4682/AD4683

Rev. 0 | Page 23 of 30

READING FROM DEVICE REGISTERS

All of the registers in the AD4682 and the AD4683 can be read

over the SPI. To perform a register read, issue a register read

command followed by an additional SPI command that can be

either a valid command or a no operation (NOP) command.

The format for a read command is shown in Table 14. Set Bit D15

to 0 to select a read command. Bits[D14:D12] contain the

ignored.

WRITING TO DEVICE REGISTERS

All of the read and write registers in the AD4682 and the

AD4683 can be written to over the SPI. The length of an SPI

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

access is 16 bits if CRC write is disabled and 24 bits when CRC

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

Table 14. Set Bit D15 to 1 to select a write command.

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

12 bits, Bits[D11:D0], contain the data to be written to the

selected register.

NOP

READ REG 1

READ REG 2

NOP

SDI

INVALID

RESULT S0

REG 1DATA

REG 2DATA

RESULT S3

SDOA

INVALID

RESULT S0

RESULT S3

SDOB

Figure 44. Register Read

NOP

WRITE REG 1

WRITE REG 2

NOP

SDI

INVALID

RESULT S0

RESULT S1

RESULT S2

SDOA

SDOB

Figure 45. Register Write

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