And then datasheet suggests that all ground pins have to be connected, which, if followed, makes PCB design harder. How come the guy designing the silicon is more important than the PCB guy?
I did not intend to imply that anyone was more important than anyone else.
Maybe it is a good idea to provide supplies to both sides of the chip, rather than having the supplies for one side flow through the other side.
I don't know, just supposition* on my part.
JimB
* Supposition = A guess that has been to university.
I think you're right JimB. It's probably down to distributing clean power "across" the chip. Look at something like the i7 900 series processors, there are in the region of 200 of each supply and ground pins.
I think you're right JimB. It's probably down to distributing clean power "across" the chip. Look at something like the i7 900 series processors, there are in the region of 200 of each supply and ground pins.
some pics have analogue and digital supplies! I forget the naming convention but for example the ADC's on some pics have there own supply pin's, even if you use the internal ref etc you still have to power the ADC pins
Thanks JimB. I'm new to uControllers and I just assumed that the multiple Power & Ground pins were to allow the Chips to carry more current. So I guess I was wrong.
Thanks JimB. I'm new to uControllers and I just assumed that the multiple Power & Ground pins were to allow the Chips to carry more current. So I guess I was wrong.
In some ways your right, if the pic had to internally connect from one side to the other, then surely the current available would drop? Not too sure now Ive said it! to me what goes on inside is the pics business unless it smokes! . The bit that annoys me though is they tend to cross the VDD and GND pins on each side! they never seem to be opposite.
In some ways your right, if the pic had to internally connect from one side to the other, then surely the current available would drop? Not too sure now Ive said it! to me what goes on inside is the pics business unless it smokes! . The bit that annoys me though is they tend to cross the VDD and GND pins on each side! they never seem to be opposite.
I'm still reading books and learning how to use my new Arduino so I haven't looked into the Chips internal structure.
Having more Pow/ Grd pins may also help keep the Chip cooler instead of trying to send all of the current through 2 pins. I usually get yelled at around here for using common sense. Perhaps I'm a glutton for punishment?