September 2000

1

MIC384

MIC384

Micrel

MIC384

Three-Zone Thermal Supervisor

Advance Information

Typical Application

CLK

FROM

SERIAL BUS

HOST

REMOTE

DIODE

2200pF

0.1

µF

MIC384

/INT

GND

3.3V

DATA

3

× 10k

pull-ups

VDD

T1

T2

A0

REMOTE

DIODE

2200pF

3-Channel SMBus Temperature Measurement System

Features

• Measures Local and Two Remote Temperatures

• 2-Wire SMBus-compatible Interface

• Programmable Thermostat Settings for All Three Zones

• Open-Drain Interrupt Output Pin

• Interrupt Mask and Status Bits

• Fault Queues to Prevent Nuisance Tripping

• Low Power Shutdown Mode

• Failsafe response to diode faults

• 2.7V to 5.5V Power Supply Range

• 8-Lead SOIC and MSOP Packages

Applications

• Desktop, Server and Notebook Computers

• Power Supplies

• Test and Measurement Equipment

• Wireless Systems

• Networking/Datacom Hardware

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

General Description

The MIC384 is a versatile digital thermal supervisor capable

of measuring temperature using its own internal sensor and

two inexpensive external sensors or embedded silicon di-

odes such as those found in the Intel Pentium III* CPU. A 2-

wire serial interface is provided to allow communication with

output pin can be used as either an over-temperature alarm

or a thermostatic control signal.

Interrupt mask and status bits are provided for reduced

software overhead. Fault queues prevent nuisance tripping

due to thermal or electrical noise. A programmable address

pin permits two devices to share the bus. (Alternate base

addresses available – contact Micrel.)

Superior perfor-

mance, low power and small size makes the MIC384 an

excellent choice for multiple zone thermal management

applications.

*SMBus and Pentium III are trademarks of Intel Corporation.

Ordering Information

Part Number

Junction Temp. Range

Package

Notes

MIC384-0BM

100 100x

–55

°C to +125°C

8-Lead SOP

MIC384-1BM

100 101x

–55

°C to +125°C

8-Lead SOP

Contact Factory

MIC384-2BM

100 110x

–55

°C to +125°C

8-Lead SOP

Contact Factory

MIC384-3BM

100 111x

–55

°C to +125°C

8-Lead SOP

Contact Factory

MIC384-0BMM

100 100x

–55

°C to +125°C

8-Lead MSOP

MIC384-1BMM

100 101x

–55

°C to +125°C

8-Lead MSOP

Contact Factory

MIC384-2BMM

100 110x

–55

°C to +125°C

8-Lead MSOP

Contact Factory

MIC384-3BMM

100 111x

–55

°C to +125°C

8-Lead MSOP

Contact Factory

* The least-significant bit of the slave address is determined by the state of the A0 pin.