September 2005
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MIC284
MIC284
Micrel, Inc.
MIC284
Two-Zone Thermal Supervisor
Typical Application
CLK
FROM
SERIAL BUS
HOST
OVER-TEMP
SHUTDOWN
REMOTE
DIODE
2200pF
0.1F
MIC284
/INT
/CRIT
3.3V
DATA
4 ?10k
pull-ups
VDD
T1
A0
GND
2-Channel SMBus Temperature Measurement System
SilentSense"
Features
" Optimized for CPU Thermal Supervision in Computing
Applications
" Measures Local and Remote Temperature
" Sigma-Delta ADC for 8-Bit Temperature Results
" 2-Wire SMBus-compatible Interface
" Programmable Thermostat Settings for both Internal and
External Zones
" Open-Drain Interrupt Output Pin
" Open-Drain Over Temperature Output Pin for Fan Con-
trol or Hardware Shutdown
" Interrupt Mask and Status Bits
" 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. " 2180 Fortune Drive " San Jose, CA 95131 " USA " tel + 1 (408) 944-0800 " fax + 1 (408) 474-1000 " http://www.micrel.com
General Description
The MIC284 is a versatile digital thermal supervisor capable of
measuring temperature using its own internal sensor and an
inexpensive external sensor or embedded silicon diode such
as those found in the Intel Pentium III" CPU. A 2-wire serial
interface is provided to allow communication with either I
2
C"
or SMBus" masters. Features include an open-drain over-
temperature output with dedicated registers for implementing
fan control or over-temperature shutdown circuits.
Interrupt status and mask bits are provided for reduced soft-
ware overhead. The open-drain interrupt output pin can be
used as either an overtemperature alarm or a thermostatic
control signal. A programmable address pin permits two
devices to share the bus. (Alternate base addresses avail-
able-contact Micrel.) Superior performance, low power and
small size makes the MIC284 an excellent choice for the most
demanding thermal management applications. The MIC284
is part of the SilentSense" family of thermal supervisors.
Data sheets and support documentation can be found on
Micrels web site at www.micrel.com.
SMBus and Pentium III are trademarks of Intel Corporation.
I
2
C is a trademark of Philips Electronics, N.V.
SilentSense is a trademark of Micrel, Inc.