Micrel MIC2358YLQ

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