General Description

The DS1856 dual, temperature-controlled, nonvolatile (NV) variable resistors with three monitors consists of two 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 Linear, 256-Position, Nonvolatile Temperature Controlled Variable Resistors

♦Resistor Settings Changeable Every 2°C

♦Three Levels of Security

♦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

♦-40°C to +95°C Operating Temperature Range