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Status

Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 280kB) Download   E-Mail

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 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

Diagram

Block Diagram

Application Notes

Application Note 207: DS1845/DS1855 Temperature Coefficient Analysis - DS1855 Application Note 3230: How to Use a PC's Parallel Port to Communicate with 2-Wire Devices - DS1855 Application Note 3315: Writing Parallel-Port 2-Wire Software in C - DS1855 Application Note 3317: Adding Windows NT/2000/XP Support to the AN3315 Parallel-Port 2-Wire Software - DS1855 Application Note 3953: Side-by-Side Comparison of Fiber-Monitoring and Control ICs - DS1855 Application Note 4051: Using an Analog Voltage to Control a Digital Potentiometer - DS1855 Application Note 4077: How to Interface the DS1862 to a Laser Driver with an Integrated APC Loop - DS1855 Application Note 4298: Constructing a Pushbutton Interface for the DS1845/DS1855 Digital Potentiometers - DS1855

Design Guides

Digital Potentiometers (PDF)

Reliability Reports

Reliability Report: DS1855.pdf

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-19 of 19

DS1855	Notes	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1855B-020				Active	CSBGA;16 pin;16 mm² Outline Drawing: 21-0355 (PDF) Land Pattern: 90-0334 (PDF) Use pkgcode/variation: X16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1855B-010	10kohms			Active	CSBGA;16 pin;16 mm² Outline Drawing: 21-0355 (PDF) Land Pattern: 90-0334 (PDF) Use pkgcode/variation: X16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1855B-050	10k/50kohms			Active	CSBGA;16 pin;16 mm² Outline Drawing: 21-0355 (PDF) Land Pattern: 90-0334 (PDF) Use pkgcode/variation: X16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1855B-010/T&R	10kohms			Active	CSBGA;16 pin;16 mm² Outline Drawing: 21-0355 (PDF) Land Pattern: 90-0334 (PDF) Use pkgcode/variation: X16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1855B-100+				Active	CSBGA;16 pin;16 mm² Outline Drawing: 21-0355 (PDF) Land Pattern: 90-0334 (PDF) Use pkgcode/variation: X16+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1855B-010+T&R	10kohms			Active	CSBGA;16 pin;16 mm² Outline Drawing: 21-0355 (PDF) Land Pattern: 90-0334 (PDF) Use pkgcode/variation: X16+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1855B-050+	10k/50kohms			Active	CSBGA;16 pin;16 mm² Outline Drawing: 21-0355 (PDF) Land Pattern: 90-0334 (PDF) Use pkgcode/variation: X16+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1855B-010+	10kohms			Active	CSBGA;16 pin;16 mm² Outline Drawing: 21-0355 (PDF) Land Pattern: 90-0334 (PDF) Use pkgcode/variation: X16+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1855X-050/U				Active	FCHIP;14 pin;5.2 mm² Outline Drawing: 21-0285 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: BF1422-1*	-40°C to +85°C	See data sheet
DS1855X-050#T&R				Active	FCHIP;14 pin;5.2 mm² Outline Drawing: 21-0285 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: BF1422-1*	-40°C to +85°C	See data sheet
DS1855X-050/T&R				Active	FCHIP;14 pin;5.2 mm² Outline Drawing: 21-0285 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: BF1422-1*	-40°C to +85°C	See data sheet
DS1855E-010	10kohms			Active	TSSOP;14 pin;33.4 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0113 (PDF) Use pkgcode/variation: U14-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1855E-050	10k/50kohms			Active	TSSOP;14 pin;33.4 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0113 (PDF) Use pkgcode/variation: U14-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1855E-010/T&R	10kohms			Active	TSSOP;14 pin;33.4 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0113 (PDF) Use pkgcode/variation: U14-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1855E-050/T&R	10k/50kohms			Active	TSSOP;14 pin;33.4 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0113 (PDF) Use pkgcode/variation: U14-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1855E-010+	10kohms			Active	TSSOP;14 pin;33.4 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0113 (PDF) Use pkgcode/variation: U14+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1855E-010+T&R	10kohms			Active	TSSOP;14 pin;33.4 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0113 (PDF) Use pkgcode/variation: U14+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1855E-050+	10k/50kohms			Active	TSSOP;14 pin;33.4 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0113 (PDF) Use pkgcode/variation: U14+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1855E-050+T&R	10k/50kohms			Active	TSSOP;14 pin;33.4 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0113 (PDF) Use pkgcode/variation: U14+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

New Product Press Release 2001-11-13

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