AD5753 datasheet(49/72 Pages) AD

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Data Sheet

AD5753

Rev. 0 | Page 49 of 72

READING FROM REGISTERS

The AD5753 has four options for readback mode that can be

configured in the TWO_STAGE_READBACK_SELECT register

(see Table 46). These options are as follows:

•

Two-stage readback

•

Autostatus readback

•

Shared SYNC autostatus readback

•

Echo mode

Two-Stage Readback Mode

Two-stage readback mode consists of a write to the TWO_

STAGE_READBACK_SELECT register to select the register

location to be read back, followed by a NOP command. To

perform a NOP command, write all zeros to Bits[D15:D0] of

the NOP register (see Table 27). During the NOP command, the

contents of the selected register are available on the SDO pin in

the data frame format shown in Table 23. It is also possible to write

a new two-stage readback command during the second frame, such

that the corresponding new data is available on the SDO pin in the

subsequent frame (see Figure 88). Bits[D31:D30] (or

Bits[D23:D22], if SPI CRC is not enabled) = 0b10 are used as part

of the synchronization during readback. The contents of the first

write instruction to the TWO_STAGE_READBACK_

SELECT register is shown in Table 24.

Table 23. SDO Contents for Read Operation

MSB

LSB

[D23:D22]

D21

[D20:16]

[D15:D0]

0b10

FAULT pin status

Data

Table 24. Reading from a Register Using Two-Stage Readback Mode

MSB

LSB

D23

D22

D21

D20

D19

D18

D17

D16

[D15:D5]

D4 D3

D2 D1

AD1

AD0

0x13

Reserved

READBACK_SELECT[4:0]

SYNC

INPUT WORD SPECIFIES

*NOP

SDI

UNDEFINED

SELECTED REGISTER DATA

CLOCKED OUT

SDO

SCLK

SELECTED REGISTER DATA

CLOCKED OUT

TWO-STAGE

READBACK

*ALTERNATIVELY,

WRITE ANOTHER

TWO-STAGE READBACK

NOP

Figure 88. Two-Stage Readback Example

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