I am using a PIC18f14K50 to source current to 4 LEDS. The data sheet says that each I/O pin can source/sink 25mA. However, all the ports combined can not source more than 95mA. I am using current limiting resistors to limit each LED to a max of 15mA per I/O. Well within the pin as well as entire PIC specs.

Anyway, after programming and testing the PIC, I am only receiving approx 2V from two of the pins and 0V at the other two. Right now, I am thinking I may have messed up the pin addressing for the two pins at 0V, but as for the other two pins I am not sure why their output is only 2V. The data sheet says when running a high output, Vdd will be at that pin.

Am I missing something here? Any suggestions/troubleshooting for the 2V out of a high (Vdd) output pin?

 

O yeah, my Vdd is 4.5V. Forgot to mention. Thanks in advance for any suggestions.

 

Post your schematic.

 

Also the code you are using. Even if it only put a constant on some port. Then we can check if your register setting is correct

 

you should try only 2 LEDs and then 3....see if there is a cut-off point.