WMS7170 / 7171

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1. GENERAL DESCRIPTION

The WMS7170/7171 is a single channel 100-tap non-volatile linear digital potentiometer available in

10K

Ω, 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

stored into a non-volatile memory location (NVMEM0), which is then automatically recalled upon

power up.

2. FEATURES

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Drop-in replacement for many popular parts

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Single linear-taper channel

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100 taps

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10K, 50K and 100K end-to-end resistance

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Automatic recall of wiper position when power-on

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Potentiometer control through Up/Down (3-wire) serial interface

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Endurance 100,000 cycles

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Data retention 100 years

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Package options:

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8-pin PDIP, SOIC or MSOP

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Industrial temperature range: -40° to 85°C

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Single supply operation : 2.7V to 5.5V