November 2000

1

MIC184

MIC184

Micrel

MIC184

Local/Remote Thermal Supervisor

Advance Information

General Description

The MIC184 is a versatile digital thermal supervisor capable

of measuring temperature using either its own internal sensor

or an inexpensive external sensor. A 2-wire serial interface is

masters. This device is a pin-for-pin and software compatible

upgrade for the industry standard LM75.

Additional features include remote temperature measure-

ment capability, and interrupt status and mask bits in the

chip’s configuration register for software polling. The open-

drain interrupt output pin can be used as either an overtem-

perature alarm or thermostatic control signal. Three program-

mable address pins permit users to multidrop up to 8 devices

along the 2-wire bus, allowing simple distributed temperature

sensing networks. Superior performance, low power and

small size makes the MIC184 an excellent choice for the most

demanding thermal management applications.

Typical Application

DATA

1

2

3

8

4

5

6

7

FROM

SERIAL BUS

HOST

OPTIONAL

REMOTE

TEMPERATURE

SENSOR

2200pF

MIC184

CLK

INT

Data

3.0V to 3.6V

Clock

Interrupt

VDD

3

×

10k

A2/T1

A1

A0

GND

0.1

µF

ceramic

2-Channel SMBus Temperature Measurement System

Features

• Measures local and remote temperatures

• Pin and software backward compatible to LM75

• 9-bit sigma-delta ADC

• Programmable thermostatic settings for either internal or

external zone

• Open-drain comparator/interrupt output pin

• Interrupt mask and status bits

• Low-power shutdown mode

• Fail-safe response to diode faults

• 2.7V to 5.5V power supply range

• Up to 8 devices may share the same bus

• 8-Lead SOP and MSOP Packages

Applications

• Desktop, Server and Notebook Computers

• Printers and Copiers

• Test and measurement equipment

• Consumer electronics

Ordering Information

Part Number

Temperature Range

Package

MIC184BM

–55

°C to +125°C

8-lead SOP

MIC184BMM

–55

°C to +125°C

8-lead MSOP

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