What is the difference in power consumption between these two RGB LED circuits, one common cathode, the other common andode?
Electrical – Common Cathode vs. Common Anode (RGB LED)
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Related Solutions
As long as you've got some transistors to drive the LEDs, then you can source your 16-bit PWM from a PSoC3. A single PSoC microcontroller should be able to give you 8x3 16-bit PWM channels. You'll then have to multiplex them.
The PSoC should even be able to handle the multiplexing in hardware, using DMA to stream the image data from memory, and deliver it to the PWM channels. This leaves the CPU to do other important tasks like generating the display data
The PSoC5 has an ARM Cortex M3 core. The good thing about the PSoC chips, though, is that they have re-configurable digital peripherals. This means you can choose to have loads of PWM, or loads of SPI, UARTS, or any combinations. You can wire up all of these peripherals internally, with gates, timers, flip flops, etc.
This means that you can probably make the hardware in the PSoC manage the screen without any intervention by the CPU, giving a good solid image.
This is only a problem if you think in terms of SOURCING a current from an output. Outputs also SINK current.
When the output is set LOW current will flow INTO the pin to ground (SINKING).
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Best Answer
Is it right? No it is not
It is utter nonsense stated by someone who obviously knows nothing about LEDs and/or electronics.
From the LED's point of view, they don't even "know" how they're connected.
Maybe the person who made the statement compared a 20 years old common cathode to a brand new common anode. Sure in 20 years LED efficiency has improved but that is unrelated to the way the LEDs are connected.