DS1855

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


Pinout




Specifications

Voltage on Any Pin Relative to Ground ....................................-0.3V to +6.0V
Operating Temperature Range ...........-40°C to +85°C; Extended Industrial
Programming Temperature Range........................................... 0°C to +85°C
Storage Temperature Range ..............................................-55°C to +125°C
Soldering Temperature .......................................See J-STD-020A Specification
* This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.


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. 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.