MIC384-3YM Microchip

MIC384 Micrel MIC384 Three-Zone Thermal Supervisor General Description Features The MIC384 is a versatile digital thermal supervisor capable Measures Local and Two Remote Temperatures of measuring temperature using its own internal sensor and 2-Wire SMBus-compatible Interface two inexpensive external sensors or embedded silicon diodes Programmable Thermostat Settings for All Three Zones such as those found in the Intel Pentium III* CPU. A 2-wire Open-Drain Interrupt Output Pin serial interface is provided to allow communication with either Interrupt Mask and Status Bits 2 I C** or SMBus* masters. The open-drain interrupt output Fault Queues to Prevent Nuisance Tripping pin can be used as either an over-temperature alarm or a Low Power Shutdown Mode thermostatic control signal. Failsafe response to diode faults 2.7V to 5.5V Power Supply Range Interrupt mask and status bits are provided for reduced soft- 8-Lead SOIC and MSOP Packages ware overhead. Fault queues prevent nuisance tripping due to thermal or electrical noise. A programmable address pin Applications permits two devices to share the bus. (Alternate base ad- Desktop, Server and Notebook Computers dresses available contact Micrel.) Superior performance, Power Supplies low power and small size makes the MIC384 an excellent Test and Measurement Equipment choice for multiple zone thermal management applications. Wireless Systems *SMBus and Pentium III are trademarks of Intel Corporation. Networking/Datacom Hardware 2 **I 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 -55C to +125C 8-Lead SOIC MIC384-1BM MIC384-1YM 100 101x -55C to +125C 8-Lead SOIC Contact Factory MIC384-2BM MIC384-2YM 100 110x -55C to +125C 8-Lead SOIC Contact Factory MIC384-3BM MIC384-3YM 100 111x -55C to +125C 8-Lead SOIC Contact Factory MIC384-0BMM MIC384-0YMM 100 100x -55C to +125C 8-Lead MSOP MIC384-1BMM MIC384-1YMM 100 101x -55C to +125C 8-Lead MSOP Contact Factory MIC384-2BMM MIC384-2YMM 100 110x -55C to +125C 8-Lead MSOP Contact Factory MIC384-3BMM MIC384-3YMM 100 111x -55C to +125C 8-Lead MSOP Contact Factory * The least-signicant bit of the slave address is determined by the state of the A0 pin. Typical Application 3.3V 0.1F 3 10k pull-ups MIC384 DATA VDD FROM SERIAL BUS CLK T1 REMOTE DIODE HOST /INT T2 2200pF GND A0 REMOTE DIODE 2200pF 3-Channel SMBus Temperature Measurement System Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 MIC384 Micrel Pin Conguration DATA 1 8 VDD CLK 2 7 A0 /INT 3 6 T1 GND 4 5 T2 Pin Description Pin Number Pin Name Pin Function 1 DATA Digital I/O: Open-drain. Serial data input/output. 2 CLK Digital Input: The host provides the serial bit clock on this input. 3 /INT Digital Output: Open-drain. Interrupt or thermostat output. 4 GND Ground: Power and signal return for all IC functions. 5 T2 Analog Input: Connection to remote temperature sensor (diode junc- tion) 6 T1 Analog Input: Connection to remote temperature sensor (diode junc- tion) 7 A0 Digital Input: Slave address selection input. See Table 1. MIC384 Slave Address Settings. 8 VDD Analog Input: Power supply input to the IC. MIC384 2 September 2005