StigOfTheDump
Senior Member
Referring to the following question
Googling some other electronics forums seemed to suggest that all should be connected. Most posts suggested that each should be decoupled individually, one even suggesting that separate power supplies could be used on sensitive applications, as different power pins supply different parts of the chip circuitry.
Could somebody please explain what is the correct procedure.
In particular:
If using 2 power supplies, how closely would they need to be matched?
Linking the 2 power pins underneath the chip, inside the socket on stripboard, when operating from a single supply, is very convenient. As this would short together the separate decoupling caps, should it be avoided?
No particular project planned. Just thought I would get it fixed in my head whilst it is at the front of my mind.
Thanks
Stig
on thread http://www.picaxeforum.co.uk/showthread.php?25280-READADC10-Bias I looked into what was necessary. I've got some 40x2s but haven't used any yet on a project. I couldn't find any info on the forum, the picaxe website or scanning through Microchip's 560 page datasheet. It must be there somewhere, just that I can't find it. Page 35 of manual 3 shows the minimum circuit for 28 pin, with both the 0v connections made, but there isn't a similar diagram for the 40 pin devices.
- If it is a PICAXE with more than one power pin per rail, are they all connected?
Googling some other electronics forums seemed to suggest that all should be connected. Most posts suggested that each should be decoupled individually, one even suggesting that separate power supplies could be used on sensitive applications, as different power pins supply different parts of the chip circuitry.
Could somebody please explain what is the correct procedure.
In particular:
If using 2 power supplies, how closely would they need to be matched?
Linking the 2 power pins underneath the chip, inside the socket on stripboard, when operating from a single supply, is very convenient. As this would short together the separate decoupling caps, should it be avoided?
No particular project planned. Just thought I would get it fixed in my head whilst it is at the front of my mind.
Thanks
Stig