MIC184 Micrel MIC184 Local/Remote Thermal Supervisor General Description Features The MIC184 is a versatile digital thermal supervisor capable Measures local and remote temperatures of measuring temperature using either its own internal sensor Pin and software backward compatible to LM75 or an inexpensive external sensor. A 2-wire serial interface is 9-bit sigma-delta ADC 2 2 provided to allow communication with either I C or SMBus 2-wire I C/SMBus compatible interface masters. This device is a pin-for-pin and software compatible Programmable thermostatic settings for either internal or upgrade for the industry standard LM75. external zone Open-drain comparator/interrupt output pin Additional features include remote temperature measurement Interrupt mask and status bits capability, and interrupt status and mask bits in the chips Low-power shutdown mode conguration register for software polling. The open-drain Fail-safe response to diode faults interrupt output pin can be used as either an overtemperature 2.7V to 5.5V power supply range alarm or thermostatic control signal. Three programmable ad- Up to 8 devices may share the same bus dress pins permit users to multidrop up to 8 devices along the 8-Lead SOP and MSOP Packages 2-wire bus, allowing simple distributed temperature sensing networks. Superior performance, low power and small size Applications makes the MIC184 an excellent choice for the most demand- Desktop, Server and Notebook Computers ing thermal management applications. Printers and Copiers Test and measurement equipment Consumer electronics Ordering Information Part Number Temperature Range Package Pb-FREE MIC184BM -55C to +125C 8-lead SOIC MIC184BMM -55C to +125C 8-lead MSOP MIC184YM -55C to +125C 8-lead SOIC X MIC184YMM -55C to +125C 8-lead MSOP X Typical Application 3.0V to 3.6V V DD MIC184 3 8 5 10k VDD A2/T1 Data 1 6 OPTIONAL DATA A1 0.1F REMOTE 2200pF TEMPERATURE 2 7 ceramic Clock CLK A0 SENSOR 3 4 Interrupt INT GND FROM SERIAL BUS HOST 2-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 MIC184 Micrel Pin Conguration DATA 1 8 VDD CLK 2 7 A0 INT 3 6 A1 GND 4 5 A2/T1 Pin Description Pin Number Pin Name Pin Function 1 DATA Data (Digital I/O): Open-drain. Serial data input/output. 2 CLK Clock (Digital Input): The host provides the serial bit clock on this input. 3 INT Interrupt (Digital Output): Open-drain. Interrupt or thermostat output. 4 GND Ground: Power and signal return for all IC functions. 5 A2/T1 Address Bit 2 (Digital Input): Slave address selection input. See Slave Ad- dress Truth Table. Temperature Sensor 1 (Analog Input): Input from remote temperature sensor (diode junction). 6 A1 Address Bit 1 (Digital Input): Slave address selection input. See Slave Ad- dress Truth Table. 7 A0 Address Bit 0 (Digital Input): Slave address selection input. See Slave Ad- dress Truth Table. 8 VDD Supply (Analog Input): Power supply input to the IC. MIC184 2 May 2006