I am starting to use the TMP512, and have a question on the remote temp sensors... The datasheet specifies that a remote PNP transistor can be connected as a diode or with the collector grounded. What is the difference? Other than an extra wire for ground, is there any performance or noise tradeoff?
I plan to use a TO-92 2N3906 via 10-20 inches of wire, at least twisted pair, probably shielded.
Thanks for any discussion,
Chris.
Hello Chris,
My apologies for not being able to answer your question earlier. I would recommend using the diode configuration (Collector and Base shorted) in your application, primarily because of 2 reasons.
1. Since you are using 10-12 inches of wire you will just need 2 wires in this case where as in the collector ground case you will need an additional wire for ground.
2. Diode connected configuration provides better settling time compared to the collector ground configuration.
Please make sure that your series resistance doesn't exceed the data sheet recommendations (refer to the above diagram).
Best Regards,
Abhi Muppiri
Applications Engineer
AIP- Sensing Products
Texas Instruments
