MAX1618
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MAX1618

Remote Temperature Sensor with SMBus Serial Interface

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

warning : NOT RECOMMENDED FOR NEW DESIGNS tooltip
warning : NOT RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
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
Additional Details
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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.

Applications

  • Central Office Telecom Equipment
  • Computers: Desktop, Workstation, Server
  • Industrial Controls
  • LAN Servers
  • Multichip Modules
  • Smart Battery Packs/Chargers
  • Test and Measurement Equipment
Complete documentation is available upon completion of a Non-Disclosure Agreement (NDA). To request an NDA, click here.

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