Author Topic: missing component  (Read 887 times)

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Offline Steps65Topic starter

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missing component
« on: July 02, 2023, 11:17:55 pm »
There is a missing component on this board at the AVCC pin of the microcontroller XMEGA128A4U, I'm not sure if it is a capacitor or something else, can you please help me.
Thanks
 

Offline ataradov

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Re: missing component
« Reply #1 on: July 02, 2023, 11:56:49 pm »
Check where the vias on the other side of the capacitor and that component go. There are two options:
1. They are shorted and go to the ground, in that case the other via is a power supply and the missing component is a capacitor.
2. Capacitor goes to the ground and the missing component goes to the power supply. In that case it is an inductor or a ferrite bead. In that case other via should go to other analog supply pins.

Edit: clearly wrong option removed.
« Last Edit: July 03, 2023, 02:35:46 am by ataradov »
Alex
 
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Offline mengfei

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Re: missing component
« Reply #2 on: July 03, 2023, 02:32:03 am »
just like the above either a cap or inductor according to some circuits of the ATX128A4U

https://www.mikrocontroller.net/topic/353330

https://www.elektroda.pl/rtvforum/topic2650441-30.html#12806588
 
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Offline Steps65Topic starter

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Re: missing component
« Reply #3 on: July 03, 2023, 02:57:12 pm »
Thanks, it's an inductor 10uH.
 

Offline SiliconWizard

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Re: missing component
« Reply #4 on: July 03, 2023, 06:44:46 pm »
Note that if it had been a capacitor, the MCU would still be working. While here, the missing inductor meant no power to AVCC, and then it probably didn't work that well.
 
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