General 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.

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)
♦ 3µA (typ) Standby Supply Current
♦ 900µA (max) Supply Current in Autoconvert Mode
♦ +3V to +5.5V Supply Range
♦ Small 10-Pin µMAX Package

Applications
    Desktop and Notebook Computers
    Smart Battery Packs
    LAN Servers
    Industrial Controls
    Central Office Telecom Equipment
    Test and Measurement
    Multichip Modules