In SX Microcontrollers, SX/B Compiler and SX-Key Tool, william wrote:

Hi Guys,

Ok I agree that my single 470nF bypass cap is nearer to the regulator than the SX.
Is 470nF multilayer better than 100nF ceramic as a bypass capacitor?
I will try to put it nearer in the next board iteration.


However I would like to dispute the notion that all the 4 Gnd and all the 4 Vdd pins on the SX48/52 needs to be connected.
Is there any mention of such requirements in the official SX Datasheet?
I also don't agree that you need 4 bypass caps for the SX48/52....   sounds like an overkill.

I believe the QFP design with a pair of Gnd-Vdd pins on each side is to allow easier PCB routing.
If we were to connect all the Gnd and all the Vdd pins together, there would be no space left to route the other pins !

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