WMS7120

The WMS7120/7121 is a single channel 64-tap non-volatile linear digital potentiometer available in 10K, 50K and 100K resistance. The device consists of Up/Down serial interface, tap register, decoder, resistor array, wiper switches, NV memory and control logics.

The WMS7120 device can be configured as a two-terminal variable resistor or a three-terminal voltage divider without an output buffer, but the WMS7121 device, which has a built-in output buffer, can only be configured as a three-terminal voltage divider. Both devices can be used in a wide variety of applications.

The output of the WMS7120 is determined by its wiper position, which varies linearly between its end terminals, RA/_VA and RB/_VB. The wiper position, R_w/V_w, is controlled by Up/Down serial interface (CS, INC and U/D) through the Tap Register (TR). In addition, the wiper position can also be stored into a non-volatile memory location (NVMEM0), which is then automatically recalled upon power up