LM95234 Datasheet | National Semiconductor

Description LM95234 is an 11-bit digital temperature sensor with a 2-wire System Management Bus (SMBus) interface that can monitor 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 diodeconnected 2N3904s. The LM95234’s Tru Therm 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 triggered when any unmasked channel exceeds its corresponding 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 programmable 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. n Tru Therm 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...