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PSoC 5, 3 & 1 MCU

Anonymous
Not applicable

Hi,

   

I´m trying to power the CY8C5267-AXI-LP051 from a 5V Supply, but i have the problem, that the internal 1.8V regulator somehow does not regulate to 1.8V, when a voltage higher than 3V is applied to the VDDD-pins of the micro. If I apply 5V the internal regulator output is 3.3V or 3.4V. I looked and looked at the design of my PCB, but I was not able to find the source of the problem.

   

Otherwise, the chip seems to work (somehow) with the higher core voltage (at least for a few seconds), I even managed to program it.

   

I attached two pictures of the PCB to the post, could someone please tell me what I did wrong?

   

Thanks in advance

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1 Solution
Esteemed Contributor II

Well, I am a system designer, not an electronic engineer. So might it be that you tied VCCA to VCC.

   

Datasheet states (pg 27) do not apply power to the VCCx pins,

   

This is also shown in the schematic on pg 10.

   

 

   

Bob

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4 Replies
Esteemed Contributor II

Welcome in the forum, Otto 😉

   

I think it would be more helpful when you post the schematic, I assume that your router would be able to create a corresponding board.

   

 

   

Bob

   

PS: And where in Germany are you located, I live near Bremen.

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Anonymous
Not applicable

Hi Bob,

   

thank you for your answer, I live in southern Germany, near Stuttgart.

   

I attached a PDF of the schematics and the KiCad file to the post.

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Esteemed Contributor II

Well, I am a system designer, not an electronic engineer. So might it be that you tied VCCA to VCC.

   

Datasheet states (pg 27) do not apply power to the VCCx pins,

   

This is also shown in the schematic on pg 10.

   

 

   

Bob

View solution in original post

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Anonymous
Not applicable

Many thanks, that was the problem. I did cut the trace to the VCCA pin and now the internal regulator puts out the correct voltage.