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GENERAL DESCRIPTION

The TCM1617 is a serially programmable temperature sensor optimized for monitoring modern high performance CPUs with on-board integrated thermal diodes. Temperature data is converted from the CPU’s thermal diode outputs and made available as an 8-Bit digital word.

Communication with the TCM1617 is accomplished via the standard System Management Bus (SMBus) commonly used in modern computer systems. This permits reading the current internal/external temperature, programming the threshold setpoints, and configuring the device. Additionally, an interrupt is generated on the ALERT# pin when temperature moves outside the preset threshold windows in either direction.

FEATURES

■ Includes Internal External Sensing Capability

■ Outputs Temperature as 8-Bit Digital Word

■ Solid State Temperature Sensing; 1°C Resolution

■ 3.0 – 5.5V Operating Range

■ Independent Internal and External Threshold

Set-Points With ALERT# Interrupt Output

■ SMBus 2-Wire Serial Interface

■ Up To Nine TCM1617s May Share the Same Bus

■ Standby Mode for Low Standby Power

■ Low Power ............................70μA (max) Operating

...................................... 10μA (max) Standby Mode

■ 16-Pin Plastic QSOP Package

TYPICAL APPLICATIONS

■ Thermal Protection For Intel “Deschutes”

Pentium II? and Other High Performance CPUs

with Integrated On-Board Diode — No Sensor

Mounting Problems!

■ Accurate Thermal Sensing From Any Si Junction

Diode

■ Thermal Management in Electronic Systems:

Computers, Network Equipment, Power Supplies