MIC284 Datasheet, PDF (1/20 Pages) Micrel Semiconductor – Two-Zone Thermal Supervisor Advance Information

MIC284
MIC284
Two-Zone Thermal Supervisor
Advance Information
Micrel
General Description
Features
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
I²C** or SMBus* masters. Features include an open-drain
over-temperature output with dedicated registers for imple-
menting fan control or over-temperature shutdown circuits.
Interrupt status and mask bits are provided for reduced
software 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.
*SMBus and Pentium III are trademarks of Intel Corporation.
**I²C is a trademark of Philips Electronics, N.V.
Ordering Information
• 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
Control 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
Part Number
Base Address⁽*⁾
Junction Temp. Range
Package
MIC284-0BM
100 100x
–55°C to +125°C
8-Lead SOP
MIC284-1BM
100 101x
–55°C to +125°C
8-Lead SOP
MIC284-2BM
100 110x
–55°C to +125°C
8-Lead SOP
MIC284-3BM
100 111x
–55°C to +125°C
8-Lead SOP
MIC284-0BMM
100 100x
–55°C to +125°C
8-Lead MSOP
MIC284-1BMM
100 101x
–55°C to +125°C
8-Lead MSOP
MIC284-2BMM
100 110x
–55°C to +125°C
8-Lead MSOP
MIC284-3BMM
100 111x
–55°C to +125°C
8-Lead MSOP
* The least-significant bit of the slave address is determined by the state of the A0 pin.
Notes
Contact Factory
Contact Factory
Contact Factory
Contact Factory
Contact Factory
Contact Factory
Typical Application
3.3V
4 × 10k
pull-ups
FROM
SERIAL BUS
HOST
OVER-TEMP
SHUTDOWN
MIC284
DATA
VDD
CLK
T1
/INT
A0
/CRIT
GND
0.1µF
2200pF
REMOTE
DIODE
2-Channel SMBus Temperature Measurement System
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
September 29, 2000
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MIC284