The LM99 is an 11-bit remote diode temperature sensor with a 2-wire System Management Bus
(SMBus) serial interface. The LM99 accurately measures: (1) its own temperature and (2) the
temperature of a remote diode-connected transistor such as the 2N3904 or a thermal diode commonly
found on Graphics Processor Units (GPU), Computer Processor Units (CPU or other ASICs. The LM99
remote diode temperature sensor shifts the temperature from the remote sensor down 16°C and
operates on that shifted temperature:
TACTUAL DIODE JUNCTION =
TLM99 + 16°C
The local temperature reading requires no offset.
The LM99 has an Offset Register which provides a means for precise matching to various
The LM99 and LM99-1 have the same functions but different SMBus slave addresses. This
allows for one of each to be on the same bus at the same time.
Activation of the ALERT output occurs when any temperature goes
outside a preprogrammed window set by the HIGH and LOW temperature limit registers or exceeds the
T_CRIT temperature limit. Activation of the T_CRIT_A occurs when any
temperature exceeds the T_CRIT programmed limit.