MAX6682

Thermistor-to-Digital Converter


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Description

The MAX6682 converts an external thermistor's temperature-dependent resistance directly into digital form. The thermistor and an external fixed resistor form a voltage-divider that is driven by the MAX6682's internal voltage reference. The MAX6682 measures the voltage across the external resistor and produces a 10-bit + sign output code dependent on that voltage.

The MAX6682 does not linearize the highly nonlinear transfer function of a typical negative temperature coefficient (NTC) thermistor, but it does provide linear output data over limited temperature ranges when used with an external resistor of the correct value. Over the 0°C to +50°C temperature range, the MAX6682 produces output data that is scaled to 8 LSBs/°C (for 0.125°C resolution), provided that the correct thermistor and external resistor values are used. Other temperature ranges can be easily accommodated, but do not necessarily yield data scaled to an even number of LSBs per degree.

The 3-wire SPI™-compatible interface can be readily connected to a variety of microcontrollers.

The MAX6682 is a read-only device, simplifying use in systems where only temperature data is required.

Power-management circuitry reduces the average thermistor current, minimizing self-heating. Between conversions, supply current is reduced to 21µA (typ). The internal voltage reference is shut down between measurements.

The MAX6682 is available in a small, 8-pin µMAX package and is specified over the -55°C to +125°C temperature range.
MAX6682: Typical Operating Circuit MAX6682: Typical Operating Circuit Enlarge+

Key Features

  • Converts Thermistor Temperature to Digital Data
  • Low Average Thermistor Current Minimizes Self-Heating Errors
  • Low Supply Current, 21µA (typ) Including 10kΩ Thermistor Current
  • Internal Voltage Reference Isolates Thermistor from Power-Supply Noise
  • 10-Bit Resolution
  • Accommodates Any Thermistor Temperature Range
  • Output Data Scaled for Direct Temperature Readings from 0°C to +50°C
  • Simple SPI-Compatible Interface
  • Small, 8-Pin µMAX Package
  • Applications/Uses

    • Battery Packs/Chargers
    • Home Appliances
    • HVAC
    • Medical Devices
    Part NumberSensor TypeFunctionsInterfaceChannelsParasite Pwr.Temp. Resolution
    (bits)
    Oper. Temp.
    (°C)
    Package/PinsBudgetary
    Price
    See Notes
    MAX6682 RemoteThermistor-to-Digital Converter3-Wire/SPIOneNo10-55 to +125
    UMAX/8
    $2.23 @1k
    See All Temperature Sensors (111)
    Pricing Notes:
    This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    Technical Documents

    Tutorial 4699 Overview of Sensor Signal Paths
    Tutorial 4679 Thermal Management Handbook

    Quality and Environmental Data

    Request Reliability Report for: MAX6682 
    Lead-Free Package Tin (Sn) Whisker Reports

    Additional Resources

    Temperature Family by Product Type

    Choosing the Best Type of Temperature Sensor


    CAD Symbols and Footprints

  • MAX6682MUA
  • MAX6682MUA+
  • MAX6682MUA+T
  • MAX6682MUA-T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
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