General Description
The MIC280 is a digital thermal supervisor capable of measuring its own internal temperature and that of a remote PN junction. 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* FPGA's. A 2-wire SMBus* 2.0 compatible serial interface is provided for host communication. Remote temperature is measured with ±1°C accuracy and 9-bit to 12-bit resolution (programmable). Independent high, low, and over-temperature thresholds are provided for each zone.

FEATUREs
•  Measures local and remote temperature
•  Highly accurate remote sensing
 ±1°C max., 60°C to 100°C
•  Superior noise immunity for reduced temperature guard
bands
•  9-bit to 12-bit temperature resolution for remote zone
•  Fault queues to further reduce nuisance tripping
•  Programmable high, low, and over-temperature thresh olds for each zone
•  SMBus 2 compatible serial interface including device timeout to prevent bus lockup
•  Voltage tolerant I/O’s
•  Open-drain interrupt output pin - supports SMBus Alert Response Address protocol
•  Low power shutdown mode
•  Locking of critical functions to insure failsafe operation
•  Failsafe response to diode faults
•  Enables ACPI compliant thermal management
•  3.0V to 3.6V power supply range
•  IttyBitty™ SOT23-6 package