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Remote Temperature Sensor with SMBus Serial Interface

Industry's Smallest Remote Diode Temperature Sensor - Measurement and Protection in a uMAX-10

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Single Channel: Measures Remote CPU Temperature
  • No Calibration Required
  • SMBus 2-Wire Serial Interface
  • Programmable Under/Overtemperature Alarms
  • Overtemperature Output for Fan Control (Thermostat Mode)
  • Supports SMBus Alert Response Accuracy
    • ±3°C (+60°C to +100°C)
    • ±5°C (-55°C to +120°C)
  • 3°A (typ) Standby Supply Current
  • 900°A (max) Supply Current in Autoconvert Mode
  • +3V to +5.5V Supply Range
  • Small 10-Pin °MAX Package

Applications/Uses

  • Central Office Telecom Equipment
  • Computers: Desktop, Workstation, Server
  • Industrial Controls
  • LAN Servers
  • Multichip Modules
  • Smart Battery Packs/Chargers
  • Test and Measurement Equipment

Description

The MAX1618 precise digital thermometer reports the temperature of a remote sensor. The remote sensor is a diode-connected transistor-typically a low-cost, easily mounted 2N3904 NPN type-that replaces conventional thermistors or thermocouples. Remote accuracy is ±3°C for multiple transistor manufacturers, with no calibration needed. The MAX1618 can also measure the die temperature of other ICs, such as microprocessors, that contain an on-chip, diode-connected transistor.

The 2-wire serial interface accepts standard System Management Bus (SMBus™) Write Byte, Read Byte, Send Byte, and Receive Byte commands to program the alarm thresholds and to read temperature data. The data format is 7 bits plus sign, with each bit corresponding to 1°C, in two's complement format. Measurements can be done automatically and autonomously, with the 16Hz conversion rate or programmed to operate in a single-shot mode.

The thermostat mode configures the active-low ALERT output as an interrupt or as a temperature reset that remains active only while the temperature is above the maximum temperature limit or below the minimum temperature limit. The active-low ALERT output polarity in thermostat mode can be configured for active high or active low. Fan control is implemented using this active-low ALERT output.

The MAX1618 is available in a small (1.1mm high) 10-pin µMAX package.

Simplified Block Diagram

MAX1618: Typical Operating Circuit MAX1618: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.