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LM95234CISD Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM95234CISD Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 5 page  LM95234 Quad Remote Diode and Local Temperature Sensor with SMBus Interface and TruTherm™ Technology General Description LM95234 is an 11-bit digital temperature sensor with a 2-wire System Management Bus (SMBus) interface that can moni- tor the temperature of four remote diodes as well as its own temperature. The LM95234 can be used to very accurately monitor the temperature of up to four external devices such as microprocessors, graphics processors or diode- connected 2N3904s. The LM95234’s TruTherm technology allows sensing of 90nm or 65nm process thermal diodes accurately. The LM95234 reports temperature in two different formats for +127.875˚C/–128˚C range and 0˚C/255˚C range. The LM95234 TCRIT1, TCRIT2 and TCRIT3 outputs are trig- gered when any unmasked channel exceeds its correspond- ing programmable limit and can be used to shutdown the system, to turn on the system fans or as a microcontroller interrupt function. The current status of the TCRIT1, TCRIT2 and TCRIT3 pins can be read back from the status registers. Mask registers are available for further control of the TCRIT outputs. Two LM95234 remote temperature channels have program- mable digital filters while the other two remote channels utilize a fault-queue to minimize unwanted TCRIT events when temperature spikes are encountered. For optimum flexibility and accuracy, each LM95234 channel includes registers for sub-micron process or 2N3904 diode model selection as well as offset correction. A three level address pin allows connection of up to 3 LM95234s to the same SMBus master. The LM95234 includes power saving functions such as: programmable conversion rate, shutdown mode, and turn off of unused channels. Features n Accurately senses die temperature of 4 remote ICs or diode junctions and local temperature n TruTherm technology accurately senses sub-micron process thermal diodes n Programmable digital filters and analog front end filter n 0.125˚C LSb temperature resolution n 0.03125˚C LSb remote temperature resolution with digital filter enabled n +127.875˚C/–128˚C and 0˚C/255˚C remote ranges n Remote diode fault detection, model selection and offset correction n Mask and status register support n 3 programmable TCRIT outputs with programmable shared hysteresis and Fault-Queue n Programmable conversion rate and shutdown mode one-shot conversion control n SMBus 2.0 compatible interface, supports TIMEOUT n Three-level address pin n 14-pin LLP package Key Specifications j Local Temperature Accuracy ±2.0 ˚C (max) j Remote Diode Temperature Accuracy ±0.75 ˚C (max) j Supply Voltage 3.0 V to 3.6 V j Average Supply Current (1Hz conversion rate) 0.5 mA (typ) Applications n Processor/Computer System Thermal Management (e.g. Laptop, Desktop, Workstations, Server) n Electronic Test Equipment n Office Electronics Connection Diagram LLP-14 20106301 TOP VIEW TruTherm™ is a trademark of National Semiconductor Corporation. ADVANCE INFORMATION August 2006 © 2006 National Semiconductor Corporation DS201063 www.national.com |
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