Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors

The DS1859 dual, temperature-controlled, nonvolatile (NV) variable resistors with three monitors consists of two 50kΩ or two 20kΩ, 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.

Applications

* Diagnostic Monitoring * Instrumentation and Industrial Controls * Optical Transceivers * Optical Transponders * RF Power Amps

* 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 50kΩ or Two 20kΩ, 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