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Hi all,
I am stuck with a problem with the ADC14.
When the PSOC gets warm, the reading of the ADC14 suddenly drops down a significant number and stays down until the chip has cooled down again. I have a simple PT1000 with a resistor attached to the input, nothing should happen there. The voltage should be stable at 5.00V.
I could prove this several times by heating the PSOC with hot air and cooling it down again.
I am talking about a start temperature of 20 degrees centigrade (normal room temperature) and a top temperature of 50 degrees centigrade (not too hot). The jump happens at around 40 degrees centigrade.
Until now I can not exclude that there is another design problem on my board, but I think this may be a problem with the ADC or its settings.
Could you please let me know what problem I might have run into?
Best regards,
Turtle
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PSoC 1
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Hi, have you solved this problem yet?
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Terrence!
COuld You please explain what You mean?
regards
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@robertseczkowski,
The post is a week old, perhaps he has already found a solution.
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The problem is still there.
But in the mean time I found out that the affected board takes significantly more current than another board that does not show this effect although it should be identical.
Still investigating. I will post when I found the solution.
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long time ago...,
but the problem is still there.
On the board I wrote about last year, there was one IC misplaced that lead to the higher current.
But even after fixing that, the measurement was still temperature dependent.
In the mean time, I have tested about 30 boards, 3 of them show the phenomenon that the reading drops when the board reaches about 40 degrees centigrade.
I have also tested "normal" boards. They show a drop of the readings when the board temperature goes up to more than approx 75 degrees centigrade, which I think is acceptable.