AD7616BSTZ datasheet(35/51 Pages) AD

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AD7616

Data Sheet

Rev. 0 | Page 34 of 50

Writing Register Data

All the read/write registers in the AD7616 can be written to

over the serial interface. A register write command is performed

by a single 16-bit SPI access. 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:D9] contain the register address. The

subsequent nine bits (Bits[D8:D0]) contain the data to be

written to the selected register. Figure 59 shows a typical serial

write command.

Reading Register Data

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 no operation (NOP). The format for

a read command is shown in Table 16. Bit D15 must be set to 0

to select a read command. Bits[D14:D9] contain the register

address. The subsequent nine bits (Bits[D8:D0]) are ignored.

See the Register Summary section for the complete list of register

addresses. Figure 60 shows a typical serial read command.

Figure 59. Serial Interface Register Write

Figure 60. Serial Interface Register Read

Table 15. Write Command Message Configuration

MSB

LSB

D15

D14

D13

D12

D11

D10

W/R

REGADDR[5:0]

Data[8:0]

Data to write

Table 16. Read Command Message Configuration

MSB

LSB

D15

D14

D13

D12

D11

D10

W/R

REGADDR[5:0]

Data[8:0]

Do not care

CONVST

WRITE REG 1

WRITE REG 2

WRITE REG 3

SDI

CONV RESULT

INVALID

SDOA, SDOB

CONVST

READ REG 1

READ REG 2

READ REG 3

SDI

CONV RESULT

REG 1 DATA

REG 2 DATA

SDOA

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