ADC0 – Constant polarization

[Marcin_W]

Dear All,
My name is Marcin.
I noticed the following problem on my custom board.
Constant polarization above 1.8V (ADC0 = 4093). When I connect resistor 5k6 to GND, ADC0 shows 0.36V (ADC0 = 820).
I tested it on 2 copies of this version of the processor.
I also tested on a PCB made by another contractor – the same polarization.
SiP on Pocketbeagle – works well.
Please find attached detailed data of processors.

• This topic was modified 5 years, 7 months ago by Marcin_W.

Attachments:

1. 

   ADC0_problem.jpg
   

[Marcin_W]

For clarity and asking questions in this regard.
I cut off all signal paths or polarity to the ADC0 input

[Neeraj Dantu]

Hi Marcin,

We have followed up on this issue offline. Please look out for a schematic review providing input on the issue from our sales team.

Best,

Neeraj

[Author]

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