LM83,datasheet,pdf(Triple-Diod

The LM83 is a digital temperature sensor with a 2 wire serial
interface that senses the voltage and thus the temperature of
three remote diodes using a Delta-Sigma analog-to-digital
converter with a digital over-temperature detector. The LM83
accurately senses its own temperature as well as the temperature
of three external devices, such as Pentium II® Processors
or diode connected 2N3904s. The temperature of
any ASIC can be detected using the LM83 as long as a dedicated
diode (semiconductor junction) is available on the die.
Using the SMBus interface a host can access the LM83’s
registers at any time. Activation of a T_CRIT_A output occurs
when any temperature is greater than a programmable
comparator limit, T_CRIT. Activation of an INT output occurs
when any temperature is greater than its corresponding programmable
comparator HIGH limit.