AD5231_15 Datasheet, PDF (1/28 Pages) Analog Devices – Nonvolatile Memory, 1024-Position Digital Potentiometer

Data Sheet
Nonvolatile Memory,
1024-Position Digital Potentiometer
AD5231
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
100-year typical data retention, TA = 55°C
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
CS
CLK
SDI
GND
ADDR
DECODE
SDI
SERIAL
INTERFACE
AD5231
V_DD
RDAC
RDAC
REGISTER
A
W
EEMEM(0)
B
SDO
WP
RDY
SDO
EEMEM
CONTROL
DIGITAL
REGISTER
O1
2 DIGITAL
OUTOUT
O2
BUFFER
EEMEM(1)
28 BYTES
V_SS
USER EEMEM
PR
Figure 1.
100
R_WA
R_WB
75
50
25
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.
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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0
0
256
512
768
1023
CODE (Decimal)
Figure 2. RWA (D) and RWB (D) vs. Decimal Code
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.
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