Hey guys, i have a problem with a circuit assembled for my PIC18f2455 MCU.
I have made the circuit twice now and seem to have some issues when i power it with with my assembled supply circuits.
The MCU ceases to function and playing with the power plug often fixes the issue. I have a dc jack connected to the board which is connected to a 24V SMPS - if i unplug and re-plug the connector cleanly it works, though if i wiggle the connector (disconnecting and reconnecting power rapidly i imagine) it seems to have issues.
Sometimes it stops functioning all together i have to power it with the pickit3 to get it to work again, sometimes re-flashing it.
I did notice this issue on the first circuit i assembled which was powered with a 9v battery going through a 7805 5v regulator ( as is the 24V supply). I found that quickly shorting out the battery fixed the issue also.
This along with the fact the MCU also stops functioning leads me to believe that the power supply is causing some issues on VDD and VSS?
I have a cap across Vdd and Vss as per the datasheet though none of my unused pins are hooked up to anything.
Is it likely that it is my circuit construction that is causing the issue? I dont believe it to be software as i can use simple example code and get the same issue.
Cheers!
I have made the circuit twice now and seem to have some issues when i power it with with my assembled supply circuits.
The MCU ceases to function and playing with the power plug often fixes the issue. I have a dc jack connected to the board which is connected to a 24V SMPS - if i unplug and re-plug the connector cleanly it works, though if i wiggle the connector (disconnecting and reconnecting power rapidly i imagine) it seems to have issues.
Sometimes it stops functioning all together i have to power it with the pickit3 to get it to work again, sometimes re-flashing it.
I did notice this issue on the first circuit i assembled which was powered with a 9v battery going through a 7805 5v regulator ( as is the 24V supply). I found that quickly shorting out the battery fixed the issue also.
This along with the fact the MCU also stops functioning leads me to believe that the power supply is causing some issues on VDD and VSS?
I have a cap across Vdd and Vss as per the datasheet though none of my unused pins are hooked up to anything.
Is it likely that it is my circuit construction that is causing the issue? I dont believe it to be software as i can use simple example code and get the same issue.
Cheers!