About STM32WLE4C8 demo board (MB1789-HP) question

[CY_Tsai]

Recently, I studied STM32WL series and want to design board by myself, so I reference MB1789-HP files to design. I have some questions about sch and pcb files, I know MCU pin 21 (RFI_N) is connect to C30 capacitor, but in PCB file, MCU pin 20 and pin 21 connect components doesn't match to sch. Whitch one is correct ? 

Below is MB1789-HP Link : https://www.st.com/resource/en/board_manufacturing_specification/mb1789_hp_bdp.zip

 

Any feedback is appreciated.

 

 

 

[Sarra.S]

Hello @CY_Tsai ,
Thank you for bringing up this issue, I reported this issue internally ( Internal Ticket number: 165876)
I suspect this issue is related to an update of one of the concerned documents.
I will keep you updated!

Sarra

[CY_Tsai]

Hi Sarra

I hope to get good news from you soon.

[Sarra.S]

Hello again @CY_Tsai, 

Please find attached the updated schematic aligned with the PCB.

 

 

[CY_Tsai]

Hi @Sarra.S

I got the file, but I have a question confused me, I compare others demo board files, such as MB1720, MB1791, MB1792, MB1842. Their schematic and PCB file are macth to each other, and they don't need to change MCU PIN20(RFI_P) and PIN21(RFI_N) to connect balun equivalent circuit. Why is there such a different?

 

Below are MB1720, MB1791, MB1792, MB1842 link :

MB1720 : https://www.st.com/resource/en/board_manufacturing_specification/mb1720_bdp.zip
MB1791 : https://www.st.com/resource/en/board_manufacturing_specification/mb1791_bdp.zip

MB1792 : https://www.st.com/resource/en/board_manufacturing_specification/mb1792_bdp.zip

MB1842 : https://www.st.com/resource/en/board_manufacturing_specification/mb1842_bdp.zip