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Analog Devices Semiconductor Electronic Components Datasheet

AD5232 Datasheet

Dual 256-Position Digital Potentiometer

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AD5232 pdf
Data Sheet
Nonvolatile Memory,
Dual 256-Position Digital Potentiometer
AD5232
FEATURES
Dual-channel, 256-position resolution
10 kΩ, 50 kΩ, and 100 kΩ nominal terminal resistance
Nonvolatile memory maintenance of wiper settings
Predefined linear increment/decrement instructions
Predefined ±6 dB step log taper increment/decrement
instructions
SPI-compatible serial interface
Wiper settings and EEMEM readback
3 V to 5 V single-supply operation
±2.5 V dual-supply operation
14 bytes of general-purpose user EEMEM
Permanent memory write protection
100-year typical data retention (TA = 55°C)
APPLICATIONS
Mechanical potentiometer replacement
Instrumentation: gain and offset adjustment
Programmable voltage-to-current conversion
Programmable filters, delays, and time constants
Programmable power supply
Low resolution DAC replacement
Sensor calibration
GENERAL DESCRIPTION
The AD5232 device provides a nonvolatile, dual-channel,
digitally controlled variable resistor (VR) with 256-position
resolution. This device performs the same electronic adjustment
function as a mechanical potentiometer with enhanced resolution,
solid state reliability, and superior low temperature coefficient
performance. The versatile programming of the AD5232, per-
ormed via a microcontroller, allows multiple modes of operation
and adjustment.
In the direct program mode, a predetermined setting of the RDAC
registers (RDAC1 and RDAC2) can be loaded directly from the
microcontroller. Another important mode of operation allows
the RDACx register to be refreshed with the setting previously
stored in the corresponding EEMEM register (EEMEM1 and
EEMEM2). When changes are made to the RDACx register to
establish a new wiper position, the value of the setting can be
saved into the EEMEMx register by executing an EEMEM save
operation. After the settings are saved in the EEMEMx register,
these values are automatically transferred to the RDACx register
to set the wiper position at system power-on. Such operation is
enabled by the internal preset strobe. The preset strobe can also
be accessed externally.
Rev. C
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
FUNCTIONAL BLOCK DIAGRAM
VDD
CS
CLK
SDI
SDO
ADDR
DECODE
SERIAL
INTERFACE
RDAC1
REGISTER
EEMEM1
AD5232
RDAC1
A1
W1
B1
POWER-ON
PR RESET
WP
RDY
EEMEM
CONTROL
RDAC2
REGISTER
EEMEM2
14 BYTES
USER
EEMEM
RDAC2
A2
W2
B2
GND
Figure 1.
VSS
All internal register contents can be read via the serial data
output (SDO). This includes the RDAC1 and RDAC2 registers,
the corresponding nonvolatile EEMEM1 and EEMEM2 registers,
and the 14 spare USER EEMEM registers that are available for
constant storage.
The basic mode of adjustment is the increment and decrement
command instructions that control the wiper position setting
register (RDACx). An internal scratch pad RDACx register can
be moved up or down one step of the nominal resistance between
Terminal A and Terminal B. This step adjustment linearly changes
the wiper to Terminal B resistance (RWB) by one position segment
of the device’s end-to-end resistance (RAB). For exponential/
logarithmic changes in wiper setting, a left/right shift command
instruction adjusts the levels in ±6 dB steps, which can be useful
for audio and light alarm applications.
The AD5232 is available in a thin, 16-lead TSSOP package.
All parts are guaranteed to operate over the extended industrial
temperature range of −40°C to +85°C. An evaluation board, the
EVAL-AD5232-10EBZ, is available.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2001–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

AD5232 Datasheet

Dual 256-Position Digital Potentiometer

No Preview Available !

AD5232 pdf
AD5232
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Electrical Characteristics—10 kΩ, 50 kΩ, 100 kΩ Versions .. 3
Interface Timing Characteristics ................................................ 5
Absolute Maximum Ratings............................................................ 7
Thermal Resistance ...................................................................... 7
ESD Caution.................................................................................. 7
Pin Configuration and Function Descriptions............................. 8
Typical Performance Characteristics ............................................. 9
Test Circuits..................................................................................... 12
Theory of Operation ...................................................................... 14
Scratch Pad and EEMEM Programming................................. 14
Basic Operation .......................................................................... 14
EEMEM Protection.................................................................... 14
REVISION HISTORY
11/13—Rev. B to Rev. C
Changed t16 from 25 ms (max) to 25 ms (typ); Table 2 ............... 5
Changes to Ordering Guide .......................................................... 22
09/11—Rev. A to Rev. B
Change to Resistor Noise Voltage Parameter in Table 1 ............. 4
10/09—Rev. 0 to Rev. A
Updated Format..................................................................Universal
Changes to Data Sheet Title ............................................................ 1
Changes to Features Section............................................................ 1
Data Sheet
Digital Input/Output Configuration........................................ 14
Serial Data Interface................................................................... 15
Daisy-Chaining Operation........................................................ 15
Advanced Control Modes ......................................................... 17
Using Additional Internal, Nonvolatile EEMEM................... 18
Terminal Voltage Operating Range ......................................... 18
Detailed Potentiometer Operation .......................................... 18
Programming the Variable Resistor......................................... 19
Programming the Potentiometer Divider............................... 20
Operation from Dual Supplies ................................................. 20
Application Programming Examples ...................................... 20
Equipment Customer Start-up Sequence
for a PCB Calibrated Unit with Protected Settings................ 21
Flash/EEMEM Reliability.......................................................... 21
Evaluation Board ........................................................................ 21
Outline Dimensions ....................................................................... 22
Ordering Guide .......................................................................... 22
Changes to Applications Section.....................................................1
Change to Wiper Resistance Parameter, Table 1 ...........................3
Changes to CS Rise to RDY Fall Time Parameter, Table 2...........5
Changes to Figure 2 and Figure 3....................................................6
Changes to Figure 24...................................................................... 12
Added Figure 32 ............................................................................. 13
Changes to Serial Data Interface Section .................................... 15
Changes to Programming the Variable Resistor Section .......... 19
Changes to Ordering Guide .......................................................... 22
10/01—Revision 0: Initial Version
Rev. C | Page 2 of 24


Part Number AD5232
Description Dual 256-Position Digital Potentiometer
Maker Analog Devices
Total Page 24 Pages
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