Part # LM89 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM89 ±0.75°C Accurate, Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface

Part Details:

Interface LM89 December 2004 ±0.75°C LM89 ±0.75°C Accurate, Remote Diode and Local Digital Accurate, Temperature Sensor with Two-Wire InterfaceGeneral Description n Offset register allows sensing a variety of thermal diodes accurately The LM89 is an 11-bit digital temperature sensor with a n On-board local temperature sensing 2-wire System Management Bus (SMBus) serial interface. n 10 bit plus sign remote diode temperature data format, The LM89 accurately measures its own temperature as well 0.125 °C resolution Remote as the temperature of an external device, such as processorthermal diode or diode-connected transistor such as the n T_CRIT_A output useful for system shutdown 2N3904. The temperature of any ASIC can be accurately n ALERT output supports SMBus 2.0 protocol determined using the LM89 as long as a dedicated diode n SMBus 2.0 compatible interface, supports TIMEOUT (semiconductor junction) is available on the target die. The n 8-pin MSOP and SOIC packages LM89 remote sensor accuracy of ±0.75°C is factory trimmed Diode for the series resistance and 1.0021 typical non-ideality fac- Key Specifications tor of the Intel® PentiumTM 4 and the Mobile Pentium 4Processor-M thermal diode. The LM89 has an Offset j Supply Voltage 3.0 V to 3.6 V register to allow measuring other diodes without j Supply Current 0.8 mA (typ) requiring continuous software management. Contact and j Local Temp Accuracy (includes quantization error) [email protected] to obtain the latest data fornew processors. T =25°C to 125°C ±3.0 °C (max) A The LM89 and the LM89-1 have the same functions but j Remote Diode Temp Accuracy (includes quantization Local

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LM89.pdf Datasheet