WMS7201

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1. GENERAL DESCRIPTION

The WMS7201 is a 256-tap, single-channel non-volatile digital potentiometer available in 10K

Ω, 50KΩ

and 100K

Ω end-to-end resistances. These devices can be used as a three-terminal potentiometer or

as a two terminal variable resistor in a wide variety of applications.

The output of the potentiometer is determined by the wiper position, which varies linearly between VA

and VB terminal according to the content stored in the volatile Tap Register (TR). The settings of the

TR can be provided either directly by the user through the industry standard SPI interface, or by the

non-volatile memory (NVMEM0~3) where the previous settings are stored. When changes are made

to the TR to establish a new wiper position, the value of the setting can be saved into any non-volatile

memory location (NVMEM0~3) by executing a NVMEM save operation. Upon powerup the content of

the NVMEM0 is automatically loaded to the Tap Register.

The WMS7201 contains a single potentiometer in 8-pin PDIP, SOIC, MSOP or 10 pin TSSOP

packages and can operate over a wide operating voltage range from 2.7V to 5.5V. A selectable output

buffer is built-in for those applications where an output buffer is required.

2. FEATURES

•

256 taps for the potentiometer

•

End-to-end resistance available in 10K

Ω, 50KΩ and 100KΩ

•

Selectable output buffer for each channel

•

SPI Serial Interface for data transfer and potentiometer control

•

Daisy-chain operation for multiple devices (10-pin TSSOP package only)

•

Nonvolatile storage of four wiper positions per channel with power-on recall from NVMEM0

•

Low standby current (1

µA Max. with output buffer inactive)

•

Endurance 100K typical stores per bit

•

Register Data Retention 100 years

•

Industrial temperature range: -40 ~ 85

°C

•

Wide operating voltage range: 2.7V ~ 5.5V

•

Package option:

8-pin MSOP, 8-pin SOIC, 8-pin PDIP, 10-pin TSSOP