General Description

The MIC281 is a digital thermal sensor capable of measuring the temperature of a remote PN junction. It is optimized for applications favoring low cost and small size. The remote junction may be an inexpensive commodity transistor, e.g., 2N3906, or an embedded thermal diode such as found in Intel Pentium* II/III/IV CPUs, AMD Athlon* CPUs, and Xilinx Virtex* FPGAs.

Features

• Remote temperature measurement using embedded thermal diodes or commodity transistors

• Accurate remote sensing ±3°C max., 0°C to 100°C

• Excellent noise rejection

• I2C and SMBus 2.0 compatible serial interface

• SMBus timeout to prevent bus lockup

• Voltage tolerant I/Os

• Low power shutdown mode

• Failsafe response to diode faults

• 3.0V to 3.6V power supply range

• IttyBitty™ SOT23-6 Package

Applications

• Desktop, server and notebook computers

• Set-top boxes

• Game consoles

• Appliances