The LM95214 is an 11-bit digital temperature sensor with a 2-wire System Management Bus
(SMBus) interface that can very accurately monitor the temperature of four remote diodes as well as
its own temperature. The four remote diodes can be external devices such as microprocessors,
graphics processors that target the ideality of a 2N3904 transistor or diode-connected 2N3904s.
The LM95214 reports temperature in two different formats for +127.875°C/–128°C range and
0°C/255°C range. The LM95214 TCRIT1, TCRIT2 and
TCRIT3 outputs are triggered when any unmasked channel exceeds its
corresponding programmable 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
TCRIT1, TCRIT2 and TCRIT3 pins
can be read back from the status registers. Mask registers are available for further control of the
Two LM95214 remote temperature channels have programmable digital filters while the
other two remote channels utilize a fault-queue to minimize unwanted TCRIT
events when temperature spikes are encountered.
For optimum flexibility and accuracy, each LM95214 channel includes registers for offset
correction. A three-level address pin allows connection of up to 3 LM95214s to the same SMBus
master. The LM95214 includes power saving functions such as: programmable conversion rate, shutdown
mode, and disabling of unused channels.
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