AD5271 datasheet(19/24 Pages) AD

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Data Sheet

AD5270/AD5271

Rev. F | Page 19 of 24

RDAC AND 50-TP READ OPERATION

A serial data output SDO pin is available for readback of the

internal RDAC register or 50-TP memory contents. The

contents of the RDAC register can be read back through SDO

by using Command 2 (see Table 11). Data from the RDAC

of the next SPI operation.

It is possible to read back the contents of any of the 50-TP

memory registers through SDO by using Command 5. The

lower six LSB bits, D0 to D5 of the data byte, select which

memory location is to be read back, as shown in Table 13.

Data from the selected memory location is clocked out of the

SDO pin during the next SPI operation. A binary encoded

version address of the most recently programmed wiper memory

location can be read back using Command 6 (see Table 11). This

can be used to monitor the spare memory status of the 50-TP

memory block.

Table 12 provides a sample listing for the sequence of serial data

input (DIN) words with the serial data output appearing at the

SDO pin in hexadecimal format for a write and read to both the

RDAC register and the 50-TP memory (Memory Location 20).

Table 11. Command Operation Truth Table

Command

Number

Command[DB13:DB10]

Data[DB9:DB0]1

Operation

NOP: do nothing.

D12

D02

Write contents of serial register

data to RDAC.

Read contents of RDAC wiper

Store wiper setting: store RDAC

setting to 50-TP.

Software reset: refresh RDAC with

last 50-TP memory stored value.

Read contents of 50-TP from SDO

output in the next frame.

Read address of last 50-TP

programmed memory location.

Write contents of serial register

data to control register.

Read contents of control register.

Software shutdown.

D0 = 0; normal mode.

D0 = 1; device placed in shutdown

mode.

X is don’t care.

AD5271 = don’t care.

See Table 15 for 50-TP memory map.

See Table 14 for bit details.

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