The LM82 is a digital temperature sensor with a 2 wire serial
interface that senses the voltage and thus the temperature of
a remote diode using a Delta-Sigma analog-to-digital converter
with a digital over-temperature detector. The LM82
accurately senses its own temperature as well as the temperature
of external devices, such as Pentium II? Processors
or diode connected 2N3904s. The temperature of any
ASIC can be detected using the LM82 as long as a dedicated
diode (semiconductor junction) is available on the die.
Using the SMBus interface a host can access the LM82’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.