WMS7171100M

Digital Potentiometers Overview

The WMS7171100M is a single-channel non-volatile linear digital potentiometer manufactured by Winbond, distributed under the Nuvoton brand. It features 100 taps and a nominal end-to-end resistance of 100 kΩ. The device includes an integrated output buffer, restricting its operation to a three-terminal voltage divider configuration. Control is managed via a 3-wire Up/Down serial interface (CS, INC, U/D). It operates on a single supply voltage ranging from 2.7V to 5.5V within an industrial temperature range of -40°C to +85°C.

Digital Potentiometers Feature Summary

• Single channel with 100 linear taps and 100 kΩ end-to-end resistance
• Built-in output buffer for voltage divider applications only
• Non-volatile memory (NVMEM0) automatically recalls wiper position upon power-up
• 3-wire Up/Down serial interface for control and data storage

Digital Potentiometers Applications

• Programmable gain amplifiers
• Voltage reference trimming
• RF amplifier control

Digital Potentiometers Procurement Notes

Verify that the component is sourced as a Winbond product, as the datasheet identifies Winbond Electronics Corporation as the manufacturer. Confirm the specific package type (SOIC, PDIP, or MSOP) matches the required board layout, as the 'M' suffix indicates MSOP packaging in the ordering information table.

Digital Potentiometers Selection Notes

Select this model over the WMS7170 variant if an output buffer is required for the voltage divider application. Ensure the system design accommodates the 100 kΩ resistance value and the 3-wire serial interface timing requirements. Verify that the operating voltage remains within the 2.7V to 5.5V range to maintain specified electrical characteristics.

Digital Potentiometers Part Context

This component belongs to the WMS717x series of non-volatile digital potentiometers. The '71' designation indicates the presence of an output buffer, distinguishing it from the WMS7170 which lacks a buffer. The series supports 10 kΩ, 50 kΩ, and 100 kΩ resistance values with 100 taps.

Digital Potentiometers Replacement Considerations

The WMS7170100M is a compatible alternative if the output buffer is not needed and rheostat mode is desired. Other variants in the series include WMS7171010M (10 kΩ) and WMS7171050M (50 kΩ).

Digital Potentiometers FAQ

Can the WMS7171100M be configured as a two-terminal variable resistor?

No, the WMS7171 device has a built-in output buffer and can only be configured as a three-terminal voltage divider.

How is the wiper position preserved during power loss?

The current wiper position is stored in Non-Volatile Memory (NVMEM0) when the CS signal transitions from LOW to HIGH while INC is HIGH. This value is automatically recalled upon power-up.

What is the maximum standby current for this device?

The standby current (ISB) is typically 1 µA when the buffer is ON and CS is HIGH with no load.