Nonvolatile Memory,

1024-Position Digital Potentiometer

Data Sheet

AD5231

Rev. D

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FEATURES

1024-position resolution

Nonvolatile memory maintains wiper setting

Power-on refresh with EEMEM setting

EEMEM restore time: 140 µs typ

Full monotonic operation

10 kΩ, 50 kΩ, and 100 kΩ terminal resistance

Permanent memory write protection

Wiper setting readback

Predefined linear increment/decrement instructions

Predefined ±6 dB/step log taper increment/decrement

instructions

SPI®-compatible serial interface

3 V to 5 V single-supply or ±2.5 V dual-supply operation

28 bytes extra nonvolatile memory for user-defined data

APPLICATIONS

Mechanical potentiometer replacement

Instrumentation: gain, offset adjustment

Programmable voltage to current conversion

Programmable filters, delays, time constants

Programmable power supply

Low resolution DAC replacement

Sensor calibration

FUNCTIONAL BLOCK DIAGRAM

EEMEM(0)

EEMEM(1)

AD5231

RDAC

CLK

SDI

GND

SDO

RDY

SDO

A

W

B

O1

O2

SDI

2

PR

WP

CS

ADDR

DECODE

RDAC

REGISTER

DIGITAL

REGISTER

SERIAL

INTERFACE

EEMEM

CONTROL

28 BYTES

USER EEMEM

DIGITAL

OUTOUT

BUFFER

Figure 1.

CODE (Decimal)

100

75

0

0

1023

256

512

768

50

25

GENERAL DESCRIPTION

The AD5231 is a nonvolatile memory1, digitally controlled

the same electronic adjustment function as a mechanical

potentiometer with enhanced resolution, solid state reliability,

and remote controllability. The AD5231 has versatile programming

that uses a standard 3-wire serial interface for 16 modes of

operation and adjustment, including scratchpad programming,

memory storing and restoring, increment/decrement, ±6 dB/step

log taper adjustment, wiper setting readback, and extra EEMEM

for user-defined information, such as memory data for other

components, look-up table, or system identification information.

In scratchpad programming mode, a specific setting can be

programmed directly to the RDAC register that sets the

resistance between Terminals W–A and Terminals W–B. This

setting can be stored into the EEMEM and is transferred

automatically to the RDAC register during system power-on.

The EEMEM content can be restored dynamically or through

external PR strobing, and a WP function protects EEMEM

contents. To simplify the programming, the linear-step increment

or decrement commands can be used to move the RDAC wiper

up or down, one step at a time. The ±6 dB step commands can

be used to double or half the RDAC wiper setting.

The AD5231 is available in a 16-lead TSSOP. The part is

guaranteed to operate over the extended industrial temperature

range of −40°C to +85°C.

1

The terms nonvolatile memory and EEMEM are used interchangeably.

2

The terms digital potentiometer and RDAC are used interchangeably.