STM32H573 CUSTOM BOARD VCAP PIN NOT OUTPUTING VOLTAGE

[Silexman]

I have designed a custom board using STM32H573IIT3Q MCU. when I connected it with st link, the st link not recognize it. After I check the voltage on power pin, all the power pin is normal except the VCAP pin (not outputing voltage). According to the AN5711, I am using the LDO configuration and here is the schematic of MCU's power.

 the BOOT pin pulled down with 10K resistor, and the reset pin is on high state when the board powered.

I have tried bypass the vcap pin with buck and the board is connected with st link and haven't found any problem but I want to use the internal LDO configuration. does someone knows what the issue is ? thank you

[LCE]

I don't know the H5s, but for the H7s the LDO must be activated in software, have you done that?

It's usually a line in the clock configuration function.

[Silexman]

thank you for the reply. According to AN5711 2.1.5 Voltage regulator, "Linear voltage regulator (LDO) is enabled on power-on reset." . which means I don't have to enable the LDO by software.

[MHoll.2]

Checking the reference manual rm0481 page 404/405, it seams that the parts with SMPS regulator don't have the LDO!
So if You don't want to use the SMPS, you have to deliver directly the Vcore voltage on the VCAP pins as shown in page 407.
This is different from other STM32 chips with SMPS, and an important disadvantage of the STM32H5.

[LCE]

Another documentation nightmare...

The H573 datasheet says "LDO and/or SMPS (depending on package)", but I haven't found a simple table or whatever to show which package actually has what.

[Silexman]

Ok thank you for the replay. let me know if you have any information. thank you

[Silexman]

UPDATE :

 

I have tried to read the PWR_SCCR, the result is 0x200 which means the supply configuration is using SMPS. but based on my schematic, the SMPS should be disable. Am I right ?.
NOTE : 
I bypass the VCAP pin so I can connect the MCU with ST-LINK.