DESCRIPTION
The DS1855 dual nonvolatile (NV) digital potentiometer and secure memory consists of one100-position linear taper potentiometer, one256-position linear taper potentiometer, 256 bytes of EEPROM memory, and a 2-wire interface. The DS1855, which features a new software write protect, is an upgrade of the DS1845. The DS1855 provides an ideal method for setting bias voltages and currents in control applications using a minimum of circuitry.

FEATURES
■ Two linear taper potentiometers
    - DS1855-010 (one 10k, 100 position and one 10k, 256 position)
    - DS1855-020 (one 10k, 100 position and one 20k, 256 position)
    - DS1855-050 (one 10k, 100 position and one 50k, 256 position)
    - DS1855-100 (one 10k, 100 position and one 100k, 256 position)
■ 256 bytes of EEPROM memory
■ Access to data and potentiometer control via a 2-wire interface
■ External write-protect pin to protect data and potentiometer settings
■ Data and potentiometer settings also can be write-protected through software control
■ Nonvolatile wiper storage
■ Operates from 3V or 5V supplies
■ Packaging: 14-pin TSSOP, 16-ball STPBGA, flip-chip package
■ Industrial operating temperature: -40ºC to +85ºC
■ Programming temperature: 0ºC to +85ºC