Dual Nonvolatile Digital Potentiometer and Secure Memory

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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.

DS1855: Block Diagram DS1855: Block Diagram Enlarge+

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


  • 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

See parametric specs for Digital Potentiometers (118)

Part NumberTaperPOTsControl InterfaceWiper MemoryStepsREND-TO-END
Res. Tol.
Temp. Coeff.
Wiper Resistance
typtypmaxSee Notes
DS1855 Linear22-Wire AddressableNon-Volatile100+256
$2.14 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Product Reliability Reports: DS1855.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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