AD5232 datasheet(16/24 Pages) AD

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AD5232

Data Sheet

Rev. C | Page 16 of 24

Command bits are identified as Cx, address bits are Ax, and

data bits are Dx. The command instruction codes are defined

in Table 8. The SDO output shifts out the last eight bits of data

clocked into the serial register for daisy-chain operation, with

the following exception: after Command Instruction 9 or Com-

mand Instruction 10, the selected internal register data is present

in Data Byte 0. The command instructions following Command

Instruction 9 and Command Instruction 10 must be full 16-bit

data-words to completely clock out the contents of the serial

that is refreshed at power-on from the corresponding nonvol-

atile EEMEMx register. The increment, decrement, and shift

command instructions ignore the contents of Data Byte 0 in the

shift register. Execution of the operation noted in Table 8 occurs

when the CS strobe returns to logic high. Execution of an NOP

instruction minimizes power dissipation.

Table 7. 16-Bit Serial Data Word

MSB

LSB

B15

B14

B13

B12

B11

B10

Table 8. Instruction/Operation Truth Table

Comm.

Inst.

No.

Instruction Byte 1

Data Byte 0

B15

Operation

No operation (NOP). Do nothing.

Write contents of EEMEM (A0) to

the RDAC (A0) register. This com-

mand leaves the device in the read

program power state. To return

the part to the idle state, perform

Command Instruction 0 (NOP).

Save wiper setting. Write

contents of RDAC (ADDR) to

EEMEM (A0).

ADDR

Write contents of Serial Register

Data Byte 0 to EEMEM (ADDR).

Decrement 6 dB right shift con-

tents of RDAC (A0). Stops at all 0s.

Decrement all 6 dB right shift

contents of all RDAC registers.

Stops at all 0s.

Decrement contents of RDAC (A0)

by 1. Stops at all 0s.

Decrement contents of all RDAC

registers by 1. Stops at all 0s.

Reset. Load all RDACs with their

corresponding, previously saved

EEMEM values.

ADDR

Write contents of EEMEM(ADDR)

to Serial Register Data Byte 0.

Write contents of RDAC (A0) to

Serial Register Data Byte 0.

Write contents of Serial Register

Data Byte 0 to RDAC (A0).

Increment 6 dB left shift contents

of RDAC (A0). Stops at all 1s.

Increment all 6 dB left shift

contents of all RDAC registers.

Stops at all 1s.

Increment contents of RDAC (A0)

by 1. Stops at all 1s.

Increment contents of all RDAC

registers by 1. Stops at all 1s.

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