MIC280 MICREL [Micrel Semiconductor], MIC280 Datasheet

MIC280

Manufacturer Part Number

MIC280

Description

Precision IttyBitty Thermal Supervisor

Manufacturer

MICREL [Micrel Semiconductor]

Datasheet

1.MIC280.pdf (23 pages)

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Download datasheet (229Kb)

General Description

The MIC280 is a digital thermal supervisor capable of measur-

ing its own internal temperature and that of a remote PN junc-

tion. 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.

The advanced integrating A/D converter and analog front-end

reduce errors due to noise for maximum accuracy and mini-

mum guardbanding. The interrupt output signals temperature

events to the host, including data-ready and diode faults.

Critical device settings can be locked to prevent changes and

insure failsafe operation. The clock, data, and interrupt pins

are 5V-tolerant regardless of the value of V

clamp the bus lines low even if the device is powered down.

Superior accuracy, failsafe operation, and small size make

the MIC280 an excellent choice for the most demanding

thermal management applications.

Typical Application

IttyBiity is a trademark of Micrel, Inc.

*All trademarks are the property of their respective owners.

November 2004

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

SERIAL BUS

HOST

3V to 3.6V

10k

3 ×

. They will not

MIC280 Typical Application

DATA

CLK

/INT

MIC280

GND

VDD

Features

• Measures local and remote temperature

• Highly accurate remote sensing

• Superior noise immunity for reduced temperature guard-

• 9-bit to 12-bit temperature resolution for remote zone

• Fault queues to further reduce nuisance tripping

• Programmable high, low, and over-temperature thresh-

• SMBus 2 compatible serial interface including device

• Voltage tolerant I/O’s

• Open-drain interrupt output pin - supports SMBus Alert

• 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

Applications

• Desktop, server and notebook computers

• Printers and copiers

• Test and measurement equipment

• Thermal supervision of Xilinx Virtex FPGA's

• Wireless/RF systems

• Intelligent power supplies

• Datacom/telecom cards

bands

olds for each zone

timeout to prevent bus lockup

Response Address protocol

Precision IttyBitty™ Thermal Supervisor

±1°C max., 60°C to 100°C

0.1µF

ceramic

1800pF

2N3906/�

CPU DIODE

MIC280

REV. 11/04

MIC280

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