DigiPot+, Smaller, More Accurate, Better Resistor Tolerance
Features and Benefits
- 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)
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.
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.
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
With versatile programmability, the AD5232 allows multiple modes of operation, including read/write access in the RDAC and EEMEM registers, increment / decrement of resistance, resistance changes in ±6 dB scales, wiper setting read-back, and extra EEMEM for storing user-defined information, such as memory data for other components or a lookup table.
The AD5232 supports dual-supply ±2.25 V to ±2.75 V operation and single-supply 2.7 V to 5.5 V operation, making the device suited for battery-powered applications and many other applications. In addition, the AD5232 uses a versatile SPI-compatible serial interface, allowing speeds of up to 50 MHz.
The EVAL-AD5232SDZ can operate in single-supply and dual-supply mode and incorporates an internal power supply from the USB.
Complete specifications for the AD5232 part can be found in the AD5232 data sheet.
Features & Benefits
- Full featured evaluation board for the AD5232
- Several test circuits
- Various ac/dc input signals
- PC control via a separately purchased system demonstration platform (SDP-B)
- PC control software
- 26 extra bytes in EEMEM for user-defined information
- Resistor tolerance error stored in EEMEM
Application Notes (6)
Software & Systems Requirements
Product Selection Guide (1)
Analog Dialogue (1)
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.