Hello Everyone,
first of all I wanted to thank you all for your help and time responding to my help request.
The situation:
I'm building a LED interface testing boards. And I have to test LED boars that can have various numbers of LED ( from 4 to 25 ) so I thought to use the following structure:
Arduino --> TLC5940s ( multiple chip chained to reach enough lines to drive Leds. In my case this number is 25 so I will connect 2 chips to have 32 lines [16 +16 ] --> Led lines.
The Problem:
TLC5940 is a chip that drives Leds with constant current sinking which works for common anode Leds but I have to test boards with common cathode leds and I have to test some boars with both CA Leds and CC mixed configuration boards.
Is it possible to create this solution?
I would need a configuration with Arduino + 2 chained TLC5940 chips that on each output line can drive both CA Leds and CC Leds on same configuration and I can program the chip base on my needs when I connect different boards to be tested by the system.
I know I need some hardware design to implement in the system and I would like to know how to do it.
These are the three configurations I need:
Common Anode:
Common Cathode:
Mixed configuration: CC & CA
Thank you all so much for helping me out with this!
Best,
Federico
first of all I wanted to thank you all for your help and time responding to my help request.
The situation:
I'm building a LED interface testing boards. And I have to test LED boars that can have various numbers of LED ( from 4 to 25 ) so I thought to use the following structure:
Arduino --> TLC5940s ( multiple chip chained to reach enough lines to drive Leds. In my case this number is 25 so I will connect 2 chips to have 32 lines [16 +16 ] --> Led lines.
The Problem:
TLC5940 is a chip that drives Leds with constant current sinking which works for common anode Leds but I have to test boards with common cathode leds and I have to test some boars with both CA Leds and CC mixed configuration boards.
Is it possible to create this solution?
I would need a configuration with Arduino + 2 chained TLC5940 chips that on each output line can drive both CA Leds and CC Leds on same configuration and I can program the chip base on my needs when I connect different boards to be tested by the system.
I know I need some hardware design to implement in the system and I would like to know how to do it.
These are the three configurations I need:
Common Anode:
Common Cathode:
Mixed configuration: CC & CA
Thank you all so much for helping me out with this!
Best,
Federico