when the CURRENTSOURCE Register is 0xFF then every single led gets 30mA, so 132 x 30mA = 3,96mA no?
THIS problem with the current is the last thing I have to know to build the circuit finally...
I'm really sorry that I'm still discussing with you
What do you mean with '1 Current Source'?
But in your first programm the current source register is 0xFF so 30mA per Led, and then you have 330mA and not 235?
But if the Current Source Register is 0xFF then all the LEDs together draw 11x30mA so 330mA and that three times (three screens) so 990mA!
Isn't there any solution to have max. 500mA for the three screens together?
Okay as I understand the PWM is responsible for the brightness (if they shine bright or dark) and because of that the leds need more or less current.And if I want now to know the current of every single led then I use that formula on the page 33 'LED Current Calculation' ?But if I only use that formula...then the fact that the other chips also need current is ignored? cause you told this: "Then you must add some for the chips themselves plus leakage, losses, blah blah blah...."
How can I be sure that the current of the LEDs is never too high that they burn? If I set the Current Source register the same value as the IMAX of the led?
I found some 10mA leds like these: (I want to use square leds, they look much cooler smiley-wink): http://www.eled.com/category.asp?catalog_name=leds&category_name=single+color+-+square+led&page=1There is written IF=10mA, but if you open the datasheet there is written 20mA! So are those leds now 10mA or 20mA for IF?Could I use them?
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