MIC280 Precision IttyBitty Thermal Supervisor General Description Features The MIC280 is a digital thermal supervisor capable of Measures local and remote temperature measuring its own internal temperature and that of a Highly accurate remote sensing: 1C max., 60C to remote PN junction. The remote junction may be an 100C inexpensive commodity transistore.g., 2N3906or an Superior noise immunity for reduced temperature embedded thermal diode such as those found in Intel guardbands Pentium II/III/IV CPUs, AMD Athlon CPUs, and Xilinx 9-bit to 12-bit temperature resolution for remote zone Virtex FPGAs. A 2-wire SMBus 2.0-compatible serial interface is provided for host communication. Remote Fault queues to further reduce nuisance tripping temperature is measured with 1C accuracy and 9-bit to Programmable high, low, and overtemperature 12-bit resolution (programmable). Independent high, low, thresholds for each zone and overtemperature thresholds are provided for each SMBus 2.0-compatible serial interface including device zone. timeout to prevent bus lockup The advanced integrating A/D converter and analog front- Voltage-tolerant I/Os end reduce errors due to noise for maximum accuracy and Open-drain interrupt output pin supports SMBus Alert minimum guardbanding. The interrupt output signals Response Address protocol temperature events to the host, including data-ready and Low power shutdown mode diode faults. Critical device settings can be locked to Locking of critical functions to ensure failsafe operation prevent changes and ensure failsafe operation. The clock, data, and interrupt pins are 5V-tolerant regardless of the Failsafe response to diode faults value of V . They will not clamp the bus lines low even if DD Enables ACPI-compliant thermal management the device is powered down. Superior accuracy, failsafe 3.0V to 3.6V power supply range operation, and small size make the MIC280 an excellent Available in IttyBitty SOT23-6 package choice for the most demanding thermal management applications. Applications Datasheets and support documentation are available on Desktop, server, and notebook computers Micrels web site at: www.micrel.com. Printers and copiers Test and measurement equipment Thermal supervision of Xilinx Virtex FPGAs Wireless/RF systems Intelligent power supplies Datacom/telecom cards Typical Application IttyBitty is a trademark of Micrel, Inc. All other trademarks are the property of their respective owners. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC280 Ordering Information Part Number Marking Slave Address Ambient Temp. Range Package MIC280-0YM6 TA00 100 1000 55 to +125C SOT23-6 b MIC280-1YM6 TA01 100 1001 55 to +125C SOT23-6 b MIC280-2YM6 TA02 100 1010 55 to +125C SOT23-6 b MIC280-3YM6 TA03 100 1011 55 to +125C SOT23-6 b MIC280-4YM6 TA04 100 1100 55 to +125C SOT23-6 b MIC280-5YM6 TA05 100 1101 55 to +125C SOT23-6 b MIC280-6YM6 TA06 100 1110 55 to +125C SOT23-6 b MIC280-7YM6 TA07 100 1111 55 to +125C SOT23-6 b Note: 1. Underbar ( ) may not be to scale. Pin Configuration SOT23-6 (M6) (Top View) Pin Description Pin Number Pin Name Pin Function 1 VDD Power supply input. 2 GND Ground. 3 T1 Analog input. Connection to remote diode junction. 4 CLK Digital input. Serial bit clock input. 5 DATA Digital input/output. Open-drain. Serial data input/output. 6 /INT Digital output. Open-drain. Interrupt output. Revision 2.0 May 5, 2014 2