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DS1855：Dual Nonvolatile Digital Potentiometer and Secure Memory

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. The EEPROM memory allows a user to store configuration or calibration data for a specific system or device as well as provide control of the potentiometer wiper settings. Any type of user information may reside in the first 248 bytes of this memory. The next two addresses of EEPROM memory are for potentiometer settings and the remaining 6 bytes of memory are reserved. These reserved and potentiometer registers should not be used for data storage. Access to this EEPROM is via an industry-standard 2-wire bus. The interface I/O pins consist of SDA and SCL. The wiper position of the DS1855, as well as EEPROM data, can be write protected through hardware using the write-protect input pin (WP) or software using the 2-wire interface.

Key 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: -40°C to +85°C

DS1855: Block Diagram Applications/Uses Automated Test Equipment (ATE) Cell Phones Consumer Audio Cordless Phones Digital Still Cameras Digital Television (Receivers, Set-Top Boxes) Industrial Sensor Transmitters/Transducers Industrial Sensor Transmitters/Transducers LCD Displays and Panels Notebook Computers Palmtops, Handy Terminals (incl. barcode) Portable Patient Monitoring/Drug Delivery Test and Measurement Equipment

DataSheet

Parametrics

Quality and Environmental Data

• DS1855.pdf

Related Products

• DS1845：Dual NV Potentiometer and Memory

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