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DS1845
Dual NV Potentiometer and Memory

Overview

Technical Documents

Ordering Info

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Status

Active: In Production.

Data Sheet

FULL DATA SHEET Download Rev 3 (PDF, 204kB) E-Mail

Description

The DS1845 Dual NV Potentiometer and 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 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. Access to this EEPROM is via an industry standard 2-wire bus. The wiper position of the DS1845, as well as EEPROM data, can be hardware write-protected using the Write Protect (WP) input pin. Up to eight DS1845s can be installed on a single 2-wire bus. Access to an individual device is achieved by using a device address that is determined by the logic levels of address pins A0 though A2. Additionally, the DS1845 will operate from 3 volt or 5 volt supplies. Three package options are available: Flip Chip Package, 16-ball CSBGA and 14-pin TSSOP.

Key Features

Two linear taper potentiometers DS1845-010 one 10k, 100 position & one 10k, 256 position DS1845-050 one 10k, 100 position & one 50k, 256 postition DS1845-100 one 10k, 100 position & one 100k, 256 position 256 bytes of EEPROM memory Access to data and potentiometer control via an I2C compatible 2-wire interface External Write Enable pin to protect data and potentiometer settings Nonvolatile wiper storage Operates from 3V or 5V supplies Packaging: Flip Chip Package, 16-ball CSBGA, 14-pin TSSOP Industrial operating temperature: -40°C to +85°C

Diagram

Pin Assignment

Application Notes
Application Note 207	DS1845/DS1855 Temperature Coefficient Analysis
Application Note 215	2-Wire Communication Using LabVIEW
Application Note 226	Step-Up DC-DC Converter Calibration and Adjustment Using a Digital Potentiometer
Application Note 1010	Methods of Controlling Laser Drivers: POTs and DACs
Application Note 1769	Behind the Light Show in Optical Transceivers
Application Note 3230	How to use a PC's parallel port to communicate with 2-wire devices
Application Note 3315	Writing Parallel-Port 2-Wire Software in C
Application Note 3317	Adding Windows NT/2000/XP Support to the AN3315 Parallel-Port 2-Wire Software
Application Note 3377	Maxim Wafer-Level Package Assembly Guide
Application Note 4002	Understanding Flip-Chip and Chip-Scale Package Technologies and Their Applications
Application Note 4051	Using an Analog Voltage to Control a Digital Potentiometer
Application Note 4298	Constructing a Pushbutton Interface for the DS1845/DS1855 Digital Potentiometers

Design Guides

Digital Potentiometers (PDF)

Reliability Reports
Reliability Report:	DS1845.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; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product 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.

Filters

Part Number: Package: Any -------- CSBGA TSSOP FCHIP Temperature: Any -------- -40°C to +85°C Tape and Reel

DS1845	Notes	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1845B-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
DS1845B-100+	10k/100kohms			Active	CSBGA;16 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1845B-050+	10k/50kohms			Active	CSBGA;16 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1845B-050/T&R				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
DS1845B-010/T&R	10k/100kohms			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
DS1845B-010+T&R	10k/100kohms			Active	CSBGA;16 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1845B-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
DS1845B-010	10k/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
DS1845B-100	10k/100kohms			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
DS1845B-050+T&R				Active	CSBGA;16 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1845B-010+	10k/10kohms			Active	CSBGA;16 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1845X-100/T&R				Active	FCHIP; Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1845X-010/T&R				Active	FCHIP; Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1845X-050/T&R				Active	FCHIP; Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1845E-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
DS1845E-010+	10k/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
DS1845E-010/T&R	10k/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
DS1845E-020				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
DS1845E-010+T&R	10k/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
DS1845E-100+T&R	10k/100kohms			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
DS1845E-100+	10k/100kohms			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
DS1845E-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
DS1845E-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
DS1845E-010	10k/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
DS1845E-100	10k/100kohms			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
DS1845E-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
DS1845E-100/T&R	10k/100kohms			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

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More Information
New Product Press Release	[ 2001-05-08 ]

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Rev 3; 2006-01-11
This page last modified: 2009-10-28