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General Description

The DS1857 dual temperature-controlled nonvolatile (NV) variable resistors with external temperature input and monitors consists of two 50k? 256-position linear variable resistors, two analog monitor inputs (MON1, MON2), and an external temperature sensor input. The device provides an ideal method for setting and temperature-compensating bias voltages and currents in control applications using minimal circuitry. The variable resistor settings are stored in EEPROM memory and can be accessed over the 2-wire serial bus.

Features

? Four Total Monitored Channels (Temperature, VCC, MON1, MON2)

? Two External Analog Inputs (MON1, MON2)

? Interface to External Temperature Sensor (LM50)

? Two 50k?, Linear, 256-Position, Nonvolatile Temperature-Controlled Variable Resistors

? Resistor Settings Changeable Every 2°C

? Access to Monitoring and ID Information Configurable with Separate Device Addresses

? Resistor Disable (Open-Circuit) Function

? 2-Wire Serial Interface

? Three Address Lines for Multiple Devices

? Operates from a 3.3V or 5V Supply

? SFF-8472 Compatible

Applications

??? Optical Transceivers

??? Optical Transponders

??? Instrumentation and Industrial Controls

??? RF Power Amps

??? Diagnostic Monitoring