September 2005
1
MIC384
MIC384
Micrel
MIC384
Three-Zone Thermal Supervisor
Typical Application
CLK
FROM
ERIALBUS
HOST
REMOTE
DIODE
2200pF
0.1礔
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. " 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 MIC384 is a versatile digital thermal supervisor capable
of measuring temperature using its own internal sensor and
two inexpensive external sensors or embedded silicon diodes
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. The open-drain interrupt 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 soft-
ware 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 ad-
dresses available contact Micrel.) Superior performance,
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.
**I
2
C is a trademark of Philips Electronics, N.V.
Ordering Information
Part Number
Base Address (*)  Junction Temp. Range
Package
Availability
Standard
Pb-Free
MIC384-0BM
MIC384-0YM
100 100x
-55癈 to +125癈
8-Lead SOIC
MIC384-1BM
MIC384-1YM
100 101x
-55癈 to +125癈
8-Lead SOIC    Contact Factory
MIC384-2BM
MIC384-2YM
100 110x
-55癈 to +125癈
8-Lead SOIC    Contact Factory
MIC384-3BM
MIC384-3YM
100 111x
-55癈 to +125癈
8-Lead SOIC    Contact Factory
MIC384-0BMM
MIC384-0YMM
100 100x
-55癈 to +125癈
8-Lead MSOP
MIC384-1BMM
MIC384-1YMM
100 101x
-55癈 to +125癈
8-Lead MSOP    Contact Factory
MIC384-2BMM
MIC384-2YMM
100 110x
-55癈 to +125癈
8-Lead MSOP    Contact Factory
MIC384-3BMM
MIC384-3YMM
100 111x
-55癈 to +125癈
8-Lead MSOP    Contact Factory
* The least-signicant bit of the slave address is determined by the state of the A0 pin.