Looking at driving a custom LED sign, basically consisting of 12 letters with multiple LEDs making up each letter. Each letter will have a maximum of 18 LEDs, and with these connected up in parallel sets of three in series, each letter will draw approximately 120mA.

Looking at driving this with a PIC16C63A. My question is.. Can I drive the inputs to the ULN2605 (DIP pins 3, 6, 11 and 14) directly from the PIC outputs?

Tried reading over the technical notes on the ULN2605, but I am at a loss interpreting it.

I would apply GND to the ULN2605 pins 4, 5, 12, 13 and +12v to pins 1 and 8.

Appreciate any feedback and thoughts...

 

Updated: I had the wrong part number listed for the ULN chip - fixed..

Looking at driving a custom LED sign, basically consisting of 12 letters with multiple LEDs making up each letter. Each letter will have a maximum of 18 LEDs, and with these connected up in parallel sets of three in series, each letter will draw approximately 120mA.

Looking at driving this with a PIC16C63A. My question is.. Can I drive the inputs to the ULN2065 (DIP pins 3, 6, 11 and 14) directly from the PIC outputs?

Tried reading over the technical notes on the ULN2065, but I am at a loss interpreting it.

I would apply GND to the ULN2065 pins 4, 5, 12, 13 and +12v to pins 1 and 8.

Appreciate any feedback and thoughts...

 

AT 100 % duty cycle, 120mA should be safe. Limit PIC output current with about 2.2k resistors to B.

 

Suggest closing this post as it has been re-posted with corrected information.

 

Actually, I chose to merge them instead. Have fun.