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What if your mentor does not know the answer to your question?

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dastructhm:
Like I recently managed to draw a schematic of my desired circuit for FT232RL. I followed other vendor's schematic and studied their hardware and then presented my schematic to my mentor. He was like, I never used FT232RL before and your schematic looks ok to me.

only "looks ok.”  :'(

I wonder how I can be sure my schematic is 100% correct, without using Multisim or the like.

 

ataradov:
"It looks ok" is a good answer for a simple schematic. There is nothing that stands out as outright wrong and if you followed manufacturer's recommendations, you are likely fine.

The way you know it works is by assembling it and testing. There is no need to overthink this. If you run into some issue, you will debug it and next time will know. That's how you learn.

WattsThat:
You left reset floating which is active low input.  Best to tie it to +5 volts to avoid flakey operation.

While it will not affect operation, the 10uf bypass seems to be overkill for the unused 3V3 output. That cap would be better used on the +5 line where higher currents are being used.

ataradov:
Reset has internal pull-up, the datasheet is explicit on that - "If not required can be left unconnected".

tooki:

--- Quote from: dastructhm on September 19, 2022, 04:38:35 am ---Like I recently managed to draw a schematic of my desired circuit for FT232RL. I followed other vendor's schematic and studied their hardware and then presented my schematic to my mentor. He was like, I never used FT232RL before and your schematic looks ok to me.

only "looks ok.”  :'(

I wonder how I can be sure my schematic is 100% correct, without using Multisim or the like.

--- End quote ---
Honest question: what kind of answer were you expecting? I mean, nobody can have experience with every part in existence. And if he’d found an obvious problem, he would have mentioned it.

FWIW, the challenge will be more when you get to the PCB layout. USB is picky, so you have to lay it out properly. (That looks like Altium, right? You can tell it to make your USB data lines a differential pair, then assign it a controlled impedance of 90 ohms. Then Altium will ensure the traces are compliant.)

Also, I’d add ESD protection to the USB data and power lines, e.g. with a Bourns CD143A-SR05 or equivalent.

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