WMS7170

www.DataSheet4U.com PRELIMINARY DATASHEET WMS7170 / 7171 NON-VOLATILE DIGITAL POTENTIOMETERS WITH UP/DOWN (3-WIRE) INTERFACE, 10KOHM, 50KOHM, 100KOHM RESISTANCE 100 TAPS WITHOUT / WITH OUTPUT BUFFER -1- Publication Release Date: July 2003 Revision 1.0 WMS7170 / 7171 1. GENERAL DESCRIPTION The WMS7170/7171 is a single channel 100-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 WMS7170 device can be configured as a two-terminal variable resistor or a three-terminal voltage divider without an output buffer, but the WMS7171 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 100 taps 10K, 50K and 100K end-to-end resistance VSS to VDD terminal voltages Automatic recall of wiper posit...