I already soldered the LEDs together and all cathodes of a layer a connected to turn on and off the layer.So the anodes of the LEDs will be connected to the IC.In the example the cathodes are connected to the IC and the anodes go to 5V.
The TLC5940 _cannot_ drive common cathode LEDs, it is a current sink driver. The 74HC595 has push-pull outputs so can source or sink.
Quote from: MarkT on Oct 21, 2012, 01:31 amThe TLC5940 _cannot_ drive common cathode LEDs, it is a current sink driver. The 74HC595 has push-pull outputs so can source or sink.so the 595 is push/pull? so it can drive an Anode AND Cathode RGB leds? (How?)
It's not constant current so using it to drive LEDs is a bad idea.
Will lighting 16 LEDs at a time with a 7HC595 damage the Arduino?Because if it is limited to 40mA it could probably only take two LEDs (with 20mA each)?
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