Features and Benefits

  • 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

Product Details

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.


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

Product Lifecycle icon-not-recommended Not Recommended for New Designs

This designates products ADI does not recommend broadly for new designs.

Evaluation Kits (5)

Documentation & Resources

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  • Data Sheets (1)
  • Reliability Data (1)
  • Application Notes (2)
  • Design Notes (8)
  • Technical Articles (9)
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