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STM32H573VIT3Q - Vcap pins have no voltage

Amit_En_C
Visitor

‎2024-10-10 05:56 AM - edited ‎2024-10-10 06:12 AM

Hello Everyone

I have designed a custom board using STM32H573VIT3Q MCU. when I connected it with st link, the st link didn't recognize it.
After I checked the voltages on the power pins, I saw all the power pins were normal except the VCAP pin (not outputing voltage at all..about 50mV).

The Vcap capacitors P.N is (Digikey) : 490-GRM155Z71A225KE01DCT-ND

 

Attached schematic for more information.
Please your help.

(Note, FB1506 is a mistake, and is not assembled). 

 

Thanks alot !

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Amit_En_C
Visitor

‎2024-10-10 08:13 AM

Update:

 

1. I disconnected R1502.

2. Assembled R1501.

3. Assembled L1500.

 

In other words - I choose the SMPS mode. (instead of the LDO).
Works like a charm.

 

If anyone has an idea why the LDO mode didn't work - please your advice (To help people who will have same question in the future

Thanks,

Amit.

 

 

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