WMS7202050P

Digital Potentiometers Overview

The WMS7202 is a dual-channel, non-volatile digital potentiometer featuring 256 taps per channel. It offers end-to-end resistance options of 10kΩ, 50kΩ, and 100kΩ with linear taper characteristics. The device operates within a voltage range of 2.7V to 5.5V and supports an industrial temperature range of -40°C to 85°C. Each channel includes four non-volatile memory locations for storing wiper positions, with automatic recall from NVMEM0 upon power-up. Control is managed via a standard SPI interface, allowing direct programming or incremental adjustments. A selectable output buffer is available for each channel to enhance drive capability in specific applications.

Digital Potentiometers Feature Summary

• Dual independent channels with 256 linear-tap resolution
• Non-volatile storage of four preset wiper positions per channel
• SPI serial interface with daisy-chain capability
• Selectable output buffer for each potentiometer channel
• Low standby current of 1µA maximum (buffer inactive)

Digital Potentiometers Applications

• Variable resistor configurations in signal processing circuits
• Voltage divider applications requiring programmable gain
• System calibration and trimmer replacement in industrial controls
• Audio volume control and tone adjustment systems

Digital Potentiometers Procurement Notes

Verify the specific resistance value (10kΩ, 50kΩ, or 100kΩ) and package type (PDIP, SOIC, or TSSOP) required for the design. Confirm that the system voltage falls within the 2.7V to 5.5V operating range. Ensure the microcontroller interface supports the required SPI timing parameters, particularly the clock cycle time and setup/hold times specified in the datasheet.

Digital Potentiometers Selection Notes

Select the WMS7202 variant based on the required end-to-end resistance and physical package constraints. Consider the need for an output buffer; if buffering is required, ensure the application utilizes the NVMEM programming sequence to enable bit D8. Verify that the environmental conditions stay within the -40°C to 85°C industrial temperature range. Check if daisy-chaining multiple units is necessary, as this affects the SPI data shifting requirements.

Digital Potentiometers Part Context

The WMS7202 belongs to the WMS720x family of digitally controlled potentiometers. It provides a solid-state alternative to mechanical trimmers, offering improved reliability and stability against temperature and time drift. The device integrates non-volatile memory to retain settings across power cycles, eliminating the need for external storage components for basic configuration retention.

Digital Potentiometers Replacement Considerations

Direct pin-compatible replacements may exist within the same manufacturer's portfolio, such as single-channel variants like the WMS7201 or other multi-channel digital potentiometers. When substituting, verify that the tap count, resistance tolerance, and memory endurance specifications meet the original design requirements. Ensure the replacement part supports the same SPI command set if software compatibility is critical.