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