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General Description

The DS1859 dual, temperature-controlled, nonvolatile (NV) variable resistors with three monitors consists of two 50k? or two 20k?, 256-position, linear, variable resistors; three analog monitor inputs (MON1, MON2,MON3); and a direct-to-digital temperature sensor. 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

? SFF-8472 Compatible

? Five Monitored Channels (Temperature, VCC, MON1, MON2, MON3)

? Three External Analog Inputs (MON1, MON2, MON3) That Support Internal and External Calibration

? Scalable Dynamic Range for External Analog Inputs

? Internal Direct-to-Digital Temperature Sensor

? Alarm and Warning Flags for All Monitored Channels

? Two 50k? or Two 20k?, 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

? 2-Wire Serial Interface

? Two Buffers with TTL/CMOS-Compatible Inputs and Open-Drain Outputs

? Operates from a 3.3V or 5V Supply

? Operating Temperature Range of -40°C to +95°C

Applications

Optical Transceivers

Optical Transponders

Instrumentation and Industrial Controls

RF Power Amps

Diagnostic Monitoring