JAJSAR0B March 2007 – October 2017 LM95214
PRODUCTION DATA.
To measure temperature external to the LM95214's die, incorporates remote diode sensing technology. This diode can be located on the die of a target IC, allowing measurement of the IC's temperature, independent of the LM95214's temperature. A discrete diode can also be used to sense the temperature of external objects or ambient air. Remember that a discrete diode's temperature will be affected, and often dominated, by the temperature of its leads. Most silicon diodes do not lend themselves well to this application. TI recommends that an MMBT3904 transistor base emitter junction be used with the collector tied to the base.
The LM95214 can measure a diode-connected transistor such as the MMBT3904 or the thermal diode found in an AMD processor. The LM95214 has been optimized to measure the MMBT3904 remote thermal diode the offset register can be used to calibrate for other thermal diodes easily. The LM95214 does not include TruTherm™ technology that allows sensing of sub-micron geometry process thermal diodes. For this application the LM95234 would be better suited.
The LM95234 has been specifically optimized to measure the remote thermal diode integrated in a typical Intel processor on 65 nm or 90 nm process or an MMBT3904 transistor. Using the Remote Diode Model Select register found in the LM95234 any of the four remote inputs can be optimized for a typical Intel processor on 65 nm or 90 nm process or an MMBT3904.