This document is a datasheet of WMS7120 / 7121 non-volatile digital potentiometers with Up / Down (3-wire) interface, 10KOhm, 50KOhm, 100KOhm resistance and 64 taps with / without output buffer.
The Winbond WMS7120 and WMS7121 are single-channel, 64-tap non-volatile linear digital potentiometers available in 10kΩ, 50kΩ, and 100kΩ end-to-end resistance. The devices utilize a Up/Down (3-wire) serial interface to control the wiper position via CS, INC, and U/D signals.
| Number of Taps | 64 taps |
|---|---|
| End-to-end Resistance | 10kΩ, 50kΩ, or 100kΩ |
| Interface Type | Up/Down (3-wire) serial interface |
| Endurance | 100,000 cycles |
| Data Retention | 100 years |
| Operating Temperature Range | -40°C to +85°C |
| Supply Voltage | 2.7V to 5.5V |
The WMS7121 has a built-in output buffer, whereas the WMS7120 does not have one.
The current wiper position is automatically stored into NVMEMO when CS goes from LOW to HIGH while INC remains HIGH.
The stored value in NVMEMO is automatically recalled and loaded into the tap register upon power up.