The LM83 is a digital temperature sensor with a 2 wire serialinterface that senses the voltage and thus the temperature ofthree remote diodes using a Delta-Sigma analog-to-digitalconverter with a digital over-temperature detector. The LM83accurately senses its own temperature as well as the temperatureof three external devices, such as Pentium II® Processorsor diode connected 2N3904s. The temperature ofany ASIC can be detected using the LM83 as long as a dedicateddiode (semiconductor junction) is available on the die.Using the SMBus interface a host can access the LM83’sregisters at any time. Activation of a T_CRIT_A output occurswhen any temperature is greater than a programmablecomparator limit, T_CRIT. Activation of an INT output occurswhen any temperature is greater than its corresponding programmablecomparator HIGH limit.
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