WMS7100 Datasheet | Winbond

DESCRIPTION The WMS7100/7101 is a single channel 256-tap non-volatile linear digital potentiometer available in 10KΩ, 50KΩ and 100KΩ resistance. The device consists of Up/Down serial interface, tap register, decoder, resistor array, wiper switches, NV memory and control logics. The WMS7100 device can be configured as a two-terminal variable resistor or a three-terminal voltage divider without an output buffer, but the WMS7101 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 potentiometer is determined by its wiper position, which varies linearly between its end terminals, RA/VA and RB/VB. The wiper position, Rw/Vw, 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. 2. FEATURES - - - - - - - .. Drop-in replacement for many popular parts Single linear-taper channel 256 taps 10K, 50K and 100K end-to-end resistance VSS to VDD terminal voltages Automatic recall of wiper position when power-on Potentiometer control through Up/Down (3-wire) serial interface Endurance 100,000 cycles Data retention 100 years Package options: 8-pin PDIP, SOIC or MSOP Industrial temperature range: -40° to 85°C Single supply operation : 2.7V to 5.5V - - - - - -2- WMS7100 / 7101 3. BLOCK DIAGRAM Tap Register RA/VA INC CS U/D Decoder Up/Down Serial Interface RW /VW RB/VB NV Memory NV Memory Control NVMEM0 FIGURE 1 - WMS7100 BLOCK DIAGRAM (Rheostat/Divider Mode) Tap Register .. CS Up/Down Serial Interface Decoder U/D NV Memory NV Memory...