Issue with MFS2613AMDA4AD Custom PCB - Incorrect LDO Voltages and Board Resetting

[alagar]

Hi Community,

I’ve developed a custom PCB using the MFS2613AMDA4AD IC, which I got soldered and assembled by JLCPCB. When I power on the module with 12V, I’m observing the following issues:

• LDOout1 is outputting 5V instead of the expected 3.3V.
• LDOout2 is correctly outputting 3.3V.
• The board resets every 8 seconds.

I have followed the schematic from the MRCANHub344 module, but I am unsure how to change LDOout1 to 3.3V.

Could anyone suggest a solution to set the LDOout1 to 3.3V via SPI? I plan to use an STM32 microcontroller to configure these voltages.

Looking forward to your suggestions.

Thank you!

[guoweisun]

Hi alagar

Please refer to below picture about SBC OTP result,LDO1 is fixed as 5V no problem.

Unfortunately it only be set during OTP,for  MFS2613AMDA4AD  has done OTP which can't be done again.

[alagar]

so ,i won't be able to set via spi communication ? to 3.3v ?

[guoweisun]

Yes!