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MIC284-3BM Datasheet(PDF) 1 Page - Micrel Semiconductor |
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MIC284-3BM Datasheet(HTML) 1 Page - Micrel Semiconductor |
1 / 20 page September 29, 2000 1 MIC284 MIC284 Micrel MIC284 Two-Zone Thermal Supervisor Advance Information Typical Application CLK FROM SERIAL BUS HOST OVER-TEMP SHUTDOWN REMOTE DIODE 2200pF 0.1 µF MIC284 /INT /CRIT 3.3V DATA 4 × 10k pull-ups VDD T1 A0 GND 2-Channel SMBus Temperature Measurement System 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 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 Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • 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 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 Part Number Base Address(*) Junction Temp. Range Package Notes MIC284-0BM 100 100x –55 °C to +125°C 8-Lead SOP MIC284-1BM 100 101x –55 °C to +125°C 8-Lead SOP Contact Factory MIC284-2BM 100 110x –55 °C to +125°C 8-Lead SOP Contact Factory MIC284-3BM 100 111x –55 °C to +125°C 8-Lead SOP Contact Factory MIC284-0BMM 100 100x –55 °C to +125°C 8-Lead MSOP MIC284-1BMM 100 101x –55 °C to +125°C 8-Lead MSOP Contact Factory MIC284-2BMM 100 110x –55 °C to +125°C 8-Lead MSOP Contact Factory MIC284-3BMM 100 111x –55 °C to +125°C 8-Lead MSOP Contact Factory * The least-significant bit of the slave address is determined by the state of the A0 pin. |
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