Nonvolatile Memory,
1024-Position Digital Potentiometer
AD5231
Data Sheet
FEATURES
FUNCTIONAL BLOCK DIAGRAM
1024-position resolution
AD5231
CS
V
DD
Nonvolatile memory maintains wiper setting
Power-on refresh with EEMEM setting
EEMEM restore time: 140 µs typ
RDAC
RDAC
ADDR
CLK
SDI
REGISTER
DECODE
A
SDI
W
B
SERIAL
INTERFACE
Full monotonic operation
GND
EEMEM(0)
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
SDO
SDO
WP
DIGITAL
O1
O2
REGISTER
DIGITAL
OUTOUT
BUFFER
2
EEMEM
CONTROL
RDY
EEMEM(1)
V
28 BYTES
USER EEMEM
SS
SPI®-compatible serial interface
PR
3 V to 5 V single-supply or 2.5 V dual-supply operation
28 bytes extra nonvolatile memory for user-defined data
100-year typical data retention, TA = 55°C
Figure 1.
100
75
50
25
0
R
R
WB
WA
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
0
256
512
768
1023
CODE (Decimal)
Figure 2. RWA (D) and RWB (D) vs. Decimal Code
GENERAL DESCRIPTION
The AD5231 is a nonvolatile memory1, digitally controlled
potentiometer2 with 1024-step resolution. The device performs
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.
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
PR
WP
external
strobing, and a
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.
In scratchpad programming mode, a specific setting can be
programmed directly to the RDAC register that sets the
1 The terms nonvolatile memory and EEMEM are used interchangeably.
2 The terms digital potentiometer and RDAC are used interchangeably.
Rev. D
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