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The LM90 is an 11-bit digital temperature sensor with a2-wire System Management Bus (SMBus) serial interface.The LM90 accurately measures its own temperature as wellas the temperature of an external device, such as processorthermal diode or diode connected transistor such as the2N3904. The temperature of any ASIC can be accuratelydetermined using the LM90 as long as a dedicated diode(semiconductor juncTIon) is available on the target die. TheLM90 remote sensor accuracy of ±3°C is factory trimmed forthe 1.008 typical non-ideality factor of the mobile PenTIum™III thermal diode. The LM90 has an Offsetregister to allow measuring other diodes withoutrequiring conTInuous software management. Contact to obtain the latest data fornew processors.
