3 replies to this topic

[bill.french]

I my quest to solve my analog input issues, I have dug out my somewhat decent "12V" regulated power supply that I have had luck with in the past -- which actually puts out 13.8V. Anyway, the netduino's specs call for 12V, but can it handle 13.8V? It would be good to know for this application as well as automotive applications since most 12V auto systems run around 13.8V, too. Come to think of it, it seems most 12V supplies I have come across put out a bit more than 12V. Thanks!

[Chris Walker]

bill, The DC input range is designed for unregulated power supplies...so we've taken this into account. No worries. [The LDO power regulators are actually rated up to 20VDC...but they could get _really_ warm if you input that much voltage.] Chris

[bill.french]

Great, thanks for the reply. Am I safe to assume all the grounds on the netduino are the same? And that the Vin is tied directly to the inner pin of the power input? Also, is is safe to have external power and be hooked up to usb for debugging? Thanks!

[Chris Walker]

The grounds on the Netduino are all the same. And the VIN on the power barrel and the VIN header are both tied to the input on the 5VDC power regulator (after passing through a reverse protection circuit). Yes, you can hook up external power and use USB at the same time. The Netduino will automatically switch its power input to the AC adapter and the USB circuitry has a resettable fuse to help keep too much power from flowing to/from the USB port. Chris