Post by thread:[PICLIST] Wich is better?

Hi Everyone, Do you know wich is better, configured unesed pins as outputs and left them with no conecction, or configure them as inputs with a fix voltage (5 or 0)... better in all senses, consuption, noise, etc... Thanks in advance, Gonzalo P.S. sorry for my bad English :) -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

Gonzalo Jiménez Yamasaki wrote: > > Hi Everyone, > > Do you know wich is better, configured unesed pins as outputs and left > them with no conecction, or configure them as inputs with a fix voltage (5 > or 0)... better in all senses, consuption, noise, etc... > > Thanks in advance, > > Gonzalo > > P.S. sorry for my bad English :) > It is not wise to leave unused pins set as unconnected (floating) inputs. It is easy and cheap to leave them as unconnected outputs, possibly with a connection pad to each of them for later use if need be. You can leave them as inputs but probably better to use pullups rather than tie directly to a supply rail in case the TRIS state changes to an output and causes a short. Plus, by removing the pullups you have connection pads for future pin use. -- Best regards Tony ICmicro's http://www.picnpoke.com spam_OUTsalesTakeThisOuTpicnpoke.com -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

In-Reply-To: <002401c000a6$9be4ad00$0100a8c0@gonzalo> .....gonzalo.jimenezKILLspam@spam@CONTROLMATIC.COM wrote: > Do you know wich is better, configured unesed pins as outputs and left > them with no conecction, or configure them as inputs with a fix > voltage (5 or 0)... better in all senses, consuption, noise, etc... I always leave them unconnected and set them as outputs. I figure that if I tie them to 0V or +5V and the program crashes and sets them as output it could cause damage. Of course you could tie them via a resistor. Also sometimes an unused output can be useful for debugging - it would be no use to you if it were wired to 0V or 5V. Anyway I don't think it makes much difference either way. Brian Gregory. briangKILLspamcix.co.uk -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.