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.The MIC281 is 100% software and hardware backward compatible with the MIC280 and features the same industry-leading noise performance and small size. The advanced integrating A/D converter and analog front-end reduce errors due to noise for maximum accuracy and minimum guardbanding.A 2-wire SMBus 2.0-compatible serial interface is provided for host communication. The clock and data pins are 5V-tolerant regardless of the value of VDD. They will not clamp the bus lines low even if the device is powered down.Superior performance, low power, and small size make the MIC281 an excellent choice for cost-sensitive thermal management applications.

  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