MIC281 Low-Cost IttyBitty Thermal Sensor General Description Features The MIC281 is a digital thermal sensor capable of Remote temperature measurement using embedded measuring the temperature of a remote PN junction. It is thermal diodes or commodity transistors optimized for applications favoring low cost and small size. Accurate remote sensing: 3C max., 0C to 100C The remote junction may be an inexpensive commodity Excellent noise rejection transistor, e.g., 2N3906, or an embedded thermal diode 2 such as found in Intel Pentium II/III/IV CPUs, AMD I C and SMBus 2.0-compatible serial interface Athlon CPUs, and Xilinx Virtex FPGAs. SMBus timeout to prevent bus lockup The MIC281 is 100% software and hardware backward Voltage tolerant I/Os compatible with the MIC280 and features the same industry-leading noise performance and small size. The Low power shutdown mode advanced integrating A/D converter and analog front-end Failsafe response to diode faults reduce errors due to noise for maximum accuracy and 3.0V to 3.6V power supply range minimum guardbanding. Available in IttyBitty SOT23-6 package A 2-wire SMBus 2.0-compatible serial interface is provided for host communication. The clock and data pins are 5V- Applications tolerant regardless of the value of V . They will not clamp DD the bus lines low even if the device is powered down. Desktop, server, and notebook computers Superior performance, low power, and small size make the Set-top boxes MIC281 an excellent choice for cost-sensitive thermal Game consoles management applications. Appliances Datasheets and support documentation are available on Micrels website at: www.micrel.com. 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. MIC281 Ordering Information (1) Part Number Marking Slave Address Ambient Temp. Range Package MIC281-0YM6 TB00 1001 000x 55 to +125C SOT23-6 b MIC281-1YM6 TB01 1001 001x 55 to +125C SOT23-6 b MIC281-2YM6 TB02 1001 010x 55 to +125C SOT23-6 b MIC281-3YM6 TB03 1001 011x 55 to +125C SOT23-6 b MIC281-4YM6 TB04 1001 100x 55 to +125C SOT23-6 b MIC281-5YM6 TB05 1001 101x 55 to +125C SOT23-6 b MIC281-6YM6 TB06 1001 110x 55 to +125C SOT23-6 b MIC281-7YM6 TB07 1001 111x 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 Analog input: Power supply input to the IC. 2 GND Ground return for all IC functions. 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 NC No connection: Must be left unconnected. Revision 2.0 April 23, 2014 2