LED driver IC: sink current using PCA9685?
Good day, all
New being here, I'm using a PCA9685 with a pinout board like Adafruit's. I'm trying to run a bunch of LEDs at 20 mA, and the chip is supposed to be able to source 10mA and sink 25mA. I understand that to have it Source, connect the LED between the PWM and GND pins and sink it between V+ and PWM.
I've tried both ways and using a multimeter and a red LED I get 12.5mA. Why is it not 25 in Sink? Also, why do I get 12.5 on source mode as well?
Any idea of it? so if possible a simple explanation would be nice, thanks a lot.