AD5232*

Features:

Nonvolatile Memory Preset Maintains Wiper Settings
Dual Channel, 256-Position Resolution
Full Monotonic Operation DNL < 1 LSB
Linear or Log Taper Settings
Push-Button Increment/Decrement Compatible
SPI-Compatible Serial Data Input with Readback
Operation,14 Bytes of User EEMEM Nonvolatile Memory for Constant Storage
Permanent Memory Write Protection
100-Year Typical Data Retention TA = 55⁰C

Application

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


Pinout




Specifications

(TA = 25°C, unless otherwise noted)
VDD to GND  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V, +7 V
VSS to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . .  +0.3 V, 7 V
VDD to VSS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7 V
VA, VB, VW to GND . . . . . . . . . . . . .  VSS 0.3 V, VDD + 0.3 V
AX BX, AX WX, BX WX
Intermittent². . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .  ±20 mA
Continuous  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±2 mA
Digital Inputs and Output Voltage to
GND  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V, VDD +0.3 V
Operating Temperature Range3
 . . . . . . . . . . .                                                 40°C to +85°C
Maximum Junction Temperature (TJ  Max)  . . . . . . . .     150°C
Storage Temperature  . . . . . . . . . . . . . . . . .65°C to +150°C
Lead Temperature, Soldering
Vapor Phase (60 sec)  . . . . . . . . . . . . . . . . . . . . . . . ..   215°C
Infrared (15 sec)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220°C


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 AD5232 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 estab-
lish 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.

All internal register contents can be read out of the serial data output (SDO). This includes the RDAC1 and RDAC2 registers AD5232, the corresponding nonvolatile EEMEM1 and EEMEM2 registers, and the 14 spare USER EEMEM registers available for constant storage.