GENERAL DESCRIPTION
The AD5232 device provides a nonvolatile, dual-channel, digitally controlled variable resistor (VR) with 256-position resolution. These devices perform the same electronic adjustment function as a potentiometer or variable resistor. The AD5232’s versatile programming via a microcontroller allows multiple modes of operation and adjustment.
In the direct program mode a predetermined setting of the RDAC register can be loaded directly from the microcontroller. Another key mode of operation allows the RDAC register to be refreshed with the setting previously stored in the EEMEM register. When changes are made to the RDAC register to establish a new wiper position, the value of the setting can be saved into the EEMEM by executing an EEMEM save operation. Once the settings are saved in the EEMEM register these values will be automatically transferred to the RDAC register to set the wiper position at system power ON. Such operation is enabled by the internal preset strobe and the preset can also be accessed externally.

FEATURES
   Nonvolatile Memory Preset Maintains Wiper Settings
   Dual Channel, 256-Position Resolution
   Full Monotonic Operation DNL < 1 LSB
   10 kΩ, 50 kΩ, 100 kΩ Terminal Resistance
   Linear or Log Taper Settings
   Push-Button Increment/Decrement Compatible
   SPI-Compatible Serial Data Input with Readback
      Function
   3 V to 5 V Single Supply or 2.5 V Dual Supply
      Operation
   14 Bytes of User EEMEM Nonvolatile Memory for
      Constant Storage
   Permanent Memory Write Protection
   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
   Line Impedance Matching
   Power Supply Adjustment
   DIP Switch Setting