DS1855 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 from the DS1845. This device 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

Applications/Uses

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 CSBGA, flip-chip package
Industrial operating temperature: -40ºC to +85ºC

	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

Key Specifications: Digital Potentiometers

Part Number

Taper

POTs Per Pkg.

Control Interface

Wiper Memory

Number of Steps

End-to-End Resistance (kΩ)

Res. Tol. (%)

Temp. Coeff. (typ)(ppm/°C)

Wiper Resistance (typ) (Ω)

Max. Idle State Supply Current @5V (µA)

Applications

Features

Supply Voltage (V)

Package

Smallest Available Package (max w/pins) (mm²)

RoHS Available

Price^*

DS1855

Linear

2-Wire Addressable

Non-Volatile

100+256

10+10
10+100
10+20
10+50

750

250

•	Fiber Communications

•

GBIC

•	256-Byte User EEPROM

•	EEPROM Wiper Memory

•

GBIC

2.7 to 5.5

CSBGA/16
FCHIP/14
TSSOP/14

Yes

$1.56 @ 1k

See All Digital Potentiometers (121)

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 prices and delivery, please see the price and availability page or contact an authorized distributor.