DESCRIPTION
The DS1855 dual nonvolatile (NV) digital potentiometer and secure memory consists of one 100-position linear taper potentiometer, one 256-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 10kΩ, 100 Position and One 10kΩ, 256 Position)
    − DS1855-020 (One 10kΩ, 100 Position and One 20kΩ, 256 Position)
    − DS1855-050 (One 10kΩ, 100 Position and One 50kΩ, 256 Position)
    − DS1855-100 (One 10kΩ, 100 Position and One 100kΩ, 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
■ 14-Pin TSSOP, 16-Ball CSBGA, and 14-Pin Flip-Chip Packages
■ Industrial Operating Temperature: -40ºC to +85ºC