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Status

Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 264kB) Download   E-Mail

Description

The DS1846 NV tri-potentiometer, memory, and MicroMonitor™ consists of two 10kohm 100-position linear taper potentiometers, one 100kohm 256-position linear taper potentiometer; 256 bytes of EEPROM memory; and a MicroMonitor. 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 and provides control of the potentiometer wiper settings. Any type of user information can reside in the first 248 bytes (00h to F7h) of this memory. The next three bytes of memory (F8h to FAh) are for potentiometer settings and the last five addresses of EEPROM memory (FBh to FFh) are reserved. These reserved and potentiometer registers should not be used for data storage. Access to this EEPROM is through an industry-standard 2-wire bus. The interface I/O pins consist of SDA and SCL. The wiper positions of the DS1846, as well as EEPROM data, can be hardware write-protected using the WP input pin. The MicroMonitor is a precision temperature-compensated reference and comparator that monitors certain vital status conditions for a microprocessor. When a sense input detects an out-of-tolerance (VCC) condition, a nonmaskable interrupt is generated. As the voltage at the device degrades, an internal powerfail signal is generated that can be used to reset the processor. When VCC returns to an in-tolerance level, the reset signal is kept in the active state for a minimum time of tRST to allow for the stabilization of the power supply and the microprocessor. The MicroMonitor also functions as a pushbutton reset control. The pushbutton input is debounced internally and generates an active pulse width of tRST minimum.

Key Features

Three linear taper potentiometers Two 10kΩ, 100-position One 100kΩ, 256-position 248 bytes of user EEPROM memory Monitors microprocessor power supply, voltage sense, and external override Access to data and potentiometer control through a 2-wire interface External write-protect (WP) pin to protect data and potentiometer settings Operates from a 5V supply Nonvolatile (NV) wiper storage Packaging: 20-pin TSSOP Programming temperature: 0ºC to +70ºC Industrial operating temperature: -40ºC to +85ºC

Diagram

Typical Application Circuit

Application Notes

Application Note 235: Using Spare NV Digital Pots as NV Digital Configuration Bits - DS1846 Application Note 1010: Methods of Controlling Laser Drivers: POTs and DACs - DS1846 Application Note 1769: Behind the Light Show in Optical Transceivers - DS1846 Application Note 3317: Adding Windows NT/2000/XP Support to the AN3315 Parallel-Port 2-Wire Software - DS1846 Application Note 4051: Using an Analog Voltage to Control a Digital Potentiometer - DS1846

Design Guides

Digital Potentiometers (PDF)

Reliability Reports

Reliability Report: DS1846.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: 1-4 of 4

DS1846	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1846E-010/T&R			Active	TSSOP;20 pin;45.2 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0116 (PDF) Use pkgcode/variation: U20-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1846E-010+			Active	TSSOP;20 pin;45.2 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0116 (PDF) Use pkgcode/variation: U20+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1846E-010+T&R			Active	TSSOP;20 pin;45.2 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0116 (PDF) Use pkgcode/variation: U20+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1846E-010			Active	TSSOP;20 pin;45.2 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0116 (PDF) Use pkgcode/variation: U20-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis

More Information

New Product Press Release 2002-04-23  DS1846 AD

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