DS1857

Dual Temperature-Controlled Resistors with External Temperature Input and Monitors

Data Sheet (Rev. 2)
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Overview

  • Four Total Monitored Channels (Temperature, VCC, MON1, MON2)
  • Two External Analog Inputs (MON1, MON2)
  • Interface to External Temperature Sensor (LM50)
  • Two 50kΩ, 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

The DS1857 dual temperature-controlled nonvolatile (NV) variable resistors with external temperature input and monitors consists of two 50kΩ 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.

Applications

  • Diagnostic Monitoring
  • Instrumentation and Industrial Controls
  • Optical Transceivers
  • Optical Transponders
  • RF Power Amps
DS1857
Dual Temperature-Controlled Resistors with External Temperature Input and Monitors
DS1857: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 5

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Digital Potentiometers (DigiPOTs) 2
DS1845
NOT RECOMMENDED FOR NEW DESIGNS Dual NV Potentiometer and Memory
DS1855
NOT RECOMMENDED FOR NEW DESIGNS Dual Nonvolatile Digital Potentiometer and Secure Memory
Interface Transceivers & Isolators 1
DS1852
Optical Transceiver Diagnostic Monitor
Matched Resistors & Transistors 2
DS1847
NOT RECOMMENDED FOR NEW DESIGNS Dual Temperature-Controlled NV Variable Resistor
DS1848
NOT RECOMMENDED FOR NEW DESIGNS Dual Temperature-Controlled NV Variable Resistor & Memory
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Evaluation Kits

eval board
schematic 1
DS1859EVKIT

Evaluation Kit for the DS1854, DS1857, DS1858, and DS1859 Fiber Optic Monitor and Control Evaluation Kit

Buy Now View Details

Features and Benefits

  • Supports DS1854, DS1857, DS1858, and DS1859
  • Windows Software Allows Easy Access to Device Functionality and Handles 2-Wire Communication
  • ZIF Socket Allows All Four Device Types to be Evaluated from a Single Board
  • Software Allows User to Program Variable Resistors from a Text File
  • Real-Time Monitoring Software Continuously Monitors Temperature, VCC, Monitor Inputs, and Status Bytes
  • External Temperature Sensor Footprint for Evaluating the DS1857
  • EV Kit's Software can be Used to Configure or Monitor the Device in a Customer's Application Circuit

Product Details

The fiber optic monitor and control evaluation kit (EV kit) provides a hardware and software interface for evaluating the DS1854, DS1857, DS1858, and DS1859. The kit includes Microsoft Windows®-compatible software that performs the 2-wire functions required to change the device settings and monitor the device registers. In addition to the general communications functions provided by the software, it allows the resistors' temperature-addressed look-up tables to be programmed from a text file. The kit hardware includes test points that allow inputs to be connected to the external stimuli and outputs to be monitored by test equipment; jumpers can be used to configure the device for the customer's application.

Applications

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

eval board
schematic 2
DS185XEVKIT

Evaluation Kit for the DS1854, DS1857, DS1858, and DS1859 Fiber Optic Monitor and Control Evaluation Kit

Buy Now View Details

Features and Benefits

  • Supports DS1854, DS1857, DS1858, and DS1859
  • Windows Software Allows Easy Access to Device Functionality and Handles 2-Wire Communication
  • ZIF Socket Allows All Four Device Types to be Evaluated from a Single Board
  • Software Allows User to Program Variable Resistors from a Text File
  • Real-Time Monitoring Software Continuously Monitors Temperature, VCC, Monitor Inputs, and Status Bytes
  • External Temperature Sensor Footprint for Evaluating the DS1857
  • EV Kit's Software can be Used to Configure or Monitor the Device in a Customer's Application Circuit

Product Details

The fiber optic monitor and control evaluation kit (EV kit) provides a hardware and software interface for evaluating the DS1854, DS1857, DS1858, and DS1859. The kit includes Microsoft Windows®-compatible software that performs the 2-wire functions required to change the device settings and monitor the device registers. In addition to the general communications functions provided by the software, it allows the resistors' temperature-addressed look-up tables to be programmed from a text file. The kit hardware includes test points that allow inputs to be connected to the external stimuli and outputs to be monitored by test equipment; jumpers can be used to configure the device for the customer's application.

Applications

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

eval board
schematic 3
DS1858EVKIT

Evaluation Kit for the DS1854, DS1857, DS1858, and DS1859 Fiber Optic Monitor and Control Evaluation Kit

Buy Now View Details

Features and Benefits

  • Supports DS1854, DS1857, DS1858, and DS1859
  • Windows Software Allows Easy Access to Device Functionality and Handles 2-Wire Communication
  • ZIF Socket Allows All Four Device Types to be Evaluated from a Single Board
  • Software Allows User to Program Variable Resistors from a Text File
  • Real-Time Monitoring Software Continuously Monitors Temperature, VCC, Monitor Inputs, and Status Bytes
  • External Temperature Sensor Footprint for Evaluating the DS1857
  • EV Kit's Software can be Used to Configure or Monitor the Device in a Customer's Application Circuit

Product Details

The fiber optic monitor and control evaluation kit (EV kit) provides a hardware and software interface for evaluating the DS1854, DS1857, DS1858, and DS1859. The kit includes Microsoft Windows®-compatible software that performs the 2-wire functions required to change the device settings and monitor the device registers. In addition to the general communications functions provided by the software, it allows the resistors' temperature-addressed look-up tables to be programmed from a text file. The kit hardware includes test points that allow inputs to be connected to the external stimuli and outputs to be monitored by test equipment; jumpers can be used to configure the device for the customer's application.

Applications

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

eval board
schematic 4
DS1857EVKIT

Evaluation Kit for the DS1854, DS1857, DS1858, and DS1859 Fiber Optic Monitor and Control Evaluation Kit

Buy Now View Details

Features and Benefits

  • Supports DS1854, DS1857, DS1858, and DS1859
  • Windows Software Allows Easy Access to Device Functionality and Handles 2-Wire Communication
  • ZIF Socket Allows All Four Device Types to be Evaluated from a Single Board
  • Software Allows User to Program Variable Resistors from a Text File
  • Real-Time Monitoring Software Continuously Monitors Temperature, VCC, Monitor Inputs, and Status Bytes
  • External Temperature Sensor Footprint for Evaluating the DS1857
  • EV Kit's Software can be Used to Configure or Monitor the Device in a Customer's Application Circuit

Product Details

The fiber optic monitor and control evaluation kit (EV kit) provides a hardware and software interface for evaluating the DS1854, DS1857, DS1858, and DS1859. The kit includes Microsoft Windows®-compatible software that performs the 2-wire functions required to change the device settings and monitor the device registers. In addition to the general communications functions provided by the software, it allows the resistors' temperature-addressed look-up tables to be programmed from a text file. The kit hardware includes test points that allow inputs to be connected to the external stimuli and outputs to be monitored by test equipment; jumpers can be used to configure the device for the customer's application.

Applications

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

eval board
schematic 5
DS1854EVKIT

Evaluation Kit for the DS1854, DS1857, DS1858, and DS1859 Fiber Optic Monitor and Control Evaluation Kit

Buy Now View Details

Features and Benefits

  • Supports DS1854, DS1857, DS1858, and DS1859
  • Windows Software Allows Easy Access to Device Functionality and Handles 2-Wire Communication
  • ZIF Socket Allows All Four Device Types to be Evaluated from a Single Board
  • Software Allows User to Program Variable Resistors from a Text File
  • Real-Time Monitoring Software Continuously Monitors Temperature, VCC, Monitor Inputs, and Status Bytes
  • External Temperature Sensor Footprint for Evaluating the DS1857
  • EV Kit's Software can be Used to Configure or Monitor the Device in a Customer's Application Circuit

Product Details

The fiber optic monitor and control evaluation kit (EV kit) provides a hardware and software interface for evaluating the DS1854, DS1857, DS1858, and DS1859. The kit includes Microsoft Windows®-compatible software that performs the 2-wire functions required to change the device settings and monitor the device registers. In addition to the general communications functions provided by the software, it allows the resistors' temperature-addressed look-up tables to be programmed from a text file. The kit hardware includes test points that allow inputs to be connected to the external stimuli and outputs to be monitored by test equipment; jumpers can be used to configure the device for the customer's application.

Applications

  • Diagnostic Monitoring
  • Instrumentation and Industrial Controls
  • Optical Transceivers
  • Optical Transponders
  • RF Power Amps
DS1859EVKIT
Evaluation Kit for the DS1854, DS1857, DS1858, and DS1859 Fiber Optic Monitor and Control Evaluation Kit
DS185XEVKIT: Typical Application Circuit
DS185XEVKIT
Evaluation Kit for the DS1854, DS1857, DS1858, and DS1859 Fiber Optic Monitor and Control Evaluation Kit
DS185XEVKIT: Typical Application Circuit
DS1858EVKIT
Evaluation Kit for the DS1854, DS1857, DS1858, and DS1859 Fiber Optic Monitor and Control Evaluation Kit
DS185XEVKIT: Typical Application Circuit
DS1857EVKIT
Evaluation Kit for the DS1854, DS1857, DS1858, and DS1859 Fiber Optic Monitor and Control Evaluation Kit
DS185XEVKIT: Typical Application Circuit
DS1854EVKIT
Evaluation Kit for the DS1854, DS1857, DS1858, and DS1859 Fiber Optic Monitor and Control Evaluation Kit
DS185XEVKIT: Typical Application Circuit

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