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May 2006
1
MIC184
MIC184
Micrel
MIC184
Local/Remote Thermal Supervisor
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
provided to allow communication with either I
2
C or SMBus
masters. This device is a pin-for-pin and software compatible
upgrade for the industry standard LM75.
Additional features include remote temperature measurement
capability, and interrupt status and mask bits in the chips
conguration register for software polling. The open-drain
interrupt output pin can be used as either an overtemperature
alarm or thermostatic control signal. Three programmable ad-
dress 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 demand-
ing thermal management applications.
Typical Application
DATA
1
2
3
8
4
5
6
7
FROM
ERIAL BUS
OPTIONAL
REMOTE
TEMPERATURE
SENSOR
2200pF
MIC184
CLK
INT
Data
3.0V to 3.6V
V
DD
Clock
Interrupt
VDD
3 ?/DIV>
10k
A2/T1
A1
A0
GND
0.1礔
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
" 2-wire I
2
C/SMBus compatible interface
" 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
Pb-FREE
MIC184BM
-55癈 to +125癈
8-lead SOIC
MIC184BMM
-55癈 to +125癈
8-lead MSOP
MIC184YM
-55癈 to +125癈
8-lead SOIC
X
MIC184YMM
-55癈 to +125癈
8-lead MSOP
X
Micrel, Inc. " 2180 Fortune Drive " San Jose, CA 95131 " USA " tel + 1 (408) 944-0800 " fax + 1 (408) 474-1000 " http://www.micrel.com
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