Datasheet AD5231 (Analog Devices)

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Nonvolatile Memory, 1024-Position Digital Potentiometer Data Sheet AD5231 FEATURES FUNCTIONAL BLOCK DIAGRAM 1024-position resolution AD5231 CS Nonvolatile memory maintains wiper setting VDD ADDR RDAC RDAC Power-on refresh with EEMEM setting CLK DECODE REGISTER A SDI SDI EEMEM restore time: 140 µs typ W Full monotonic operation SERIAL GND INTERFACE EEMEM(0) B 10 kΩ, 50 kΩ, and 100 kΩ terminal resistance Permanent memory write protection SDO SDO DIGITAL Wiper setting readback O1 REGISTER WP 2 DIGITAL Predefined linear increment/decrement instructions EEMEM OUTOUT O2 CONTROL RDY BUFFER Predefined ±6 dB/step log taper increment/decrement EEMEM(1) instructions V 28 BYTES SS SPI®-compatible serial interface USER EEMEM
001
PR 3 V to 5 V single-supply or ±2.5 V dual-supply operation
02739- Figure 1.
28 bytes extra nonvolatile memory for user-defined data 100-year typical data retention, T 100 A = 55°C R R WA WB ) APPLICATIONS AB R al 75 Mechanical potentiometer replacement n mi Instrumentation: gain, offset adjustment f No Programmable voltage to current conversion % o 50 Programmable filters, delays, time constants ; ( (D) Programmable power supply WB Low resolution DAC replacement R ), (D 25 Sensor calibration WAR 0 0 256 512 768 1023
002
CODE (Decimal)
02739- Figure 2. RWA (D) and RWB (D) vs. Decimal Code
GENERAL DESCRIPTION
The AD5231 is a nonvolatile memory1, digitally controlled resistance between Terminals W–A and Terminals W–B. This potentiometer2 with 1024-step resolution. The device performs setting can be stored into the EEMEM and is transferred the same electronic adjustment function as a mechanical automatically to the RDAC register during system power-on. potentiometer with enhanced resolution, solid state reliability, The EEMEM content can be restored dynamically or through and remote controllability. The AD5231 has versatile programming external PR strobing, and a WP function protects EEMEM that uses a standard 3-wire serial interface for 16 modes of contents. To simplify the programming, the linear-step increment operation and adjustment, including scratchpad programming, or decrement commands can be used to move the RDAC wiper memory storing and restoring, increment/decrement, ±6 dB/step up or down, one step at a time. The ±6 dB step commands can log taper adjustment, wiper setting readback, and extra EEMEM be used to double or half the RDAC wiper setting. for user-defined information, such as memory data for other components, look-up table, or system identification information. The AD5231 is available in a 16-lead TSSOP. The part is guaranteed to operate over the extended industrial temperature In scratchpad programming mode, a specific setting can be range of −40°C to +85°C. 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.
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Document Outline Features Applications Functional Block Diagram General Description Revision History Specifications Electrical Characteristics—10 kΩ, 50 kΩ, 100 kΩ Versions Timing Characteristics—10 kΩ, 50 kΩ, 100 kΩ Versions Timing Diagrams Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Test Circuits Theory of Operation Scratchpad and EEMEM Programming Basic Operation EEMEM Protection Digital Input/Output Configuration Serial Data Interface Daisy-Chain Operation Terminal Voltage Operation Range Power-Up Sequence Latched Digital Outputs Advanced Control Modes Linear Increment and Decrement Instructions Logarithmic Taper Mode Adjustment Using Additional Internal Nonvolatile EEMEM RDAC Structure Programming the Variable Resistor Rheostat Operation Programming the Potentiometer Divider Voltage Output Operation Programming Examples Flash/EEMEM Reliability Applications Bipolar Operation from Dual Supplies High Voltage Operation Bipolar Programmable Gain Amplifier 10-Bit Bipolar DAC 10-Bit Unipolar DAC Programmable Voltage Source with Boosted Output Programmable Current Source Programmable Bidirectional Current Source Resistance Scaling RDAC Circuit Simulation Model Outline Dimensions Ordering Guide