The LM95245 is an 11-bit digital temperature sensor with a 2-wire System Management Bus
(SMBus) interface and TruTherm technology that can monitor the temperature of a remote diode as
well as its own temperature. The LM95245 can be used to very accurately monitor the temperature of
external devices such as microprocessors. TruTherm technology allows the LM95245 to precisely
monitor thermal diodes found in 90 nm and smaller geometry processes. The LM95245 is specifically
targeted for Intel processors on 45nm process. LM95245 reports temperature in two different formats
for +127.875°C/-128°C range and 0°C/255°C range. The LM95245 T_CRIT and
OS outputs are asserted when either unmasked channel exceeds its programmed
limit and can be used to shutdown the system, to turn on the system fans, or as a microcontroller
interrupt function. The current status of the T_CRIT and
OS pins can be read back from the status registers via the SMBus interface.
All limits have a shared programmable hysteresis register.
The remote temperature channel of the LM95245 has a programmable digital filter. The
LM95245 is targeted for a typical Intel® processor on a 45 nm, 65 nm or 90nm process, and has an
offset register for maximum flexibility and best accuracy.
The LM95245 has a three-level address pin to connect up to 3 devices to the same SMBus
master, that is shared with the OS output. The LM95245 has a programmable
conversion rate register and a standby mode to save power. One conversion can be triggered in
standby mode by writing to the one-shot register.
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