AM623: Short circuits on CAP_VDDSx pins

Josh Green

Part Number: AM623

Hi,

I have a batch of PCBAs that have been manufactured with short circuits (caused by solder bridges) on some of the CAP_VDDSx pins to GND.

This was noticed as the unprogrammed boards are drawing an extra 100mA on top of expected consumption.

If possible, I'd like to know more about the internal paths between the CAP_VDDSx pin and the VDDSHV pins, and if any damage could be caused to the processor as a result of these shorts?

Thanks, Josh

over 2 years ago

0 Josh Green over 2 years ago

Prodigy 90 points

I have just found this similar question:
https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1254617/am623-decoupling-caps-on-cap_vddsx

Is it possible to know if the internal LDOs have over-current protection or a max Iout prior to damage?

Thanks, Josh

+1 peaves over 2 years ago in reply to Josh Green

TI__Guru 63145 points

The LDOs were not designed to accommodate a short since the only external connectivity is the capacitor. You should assume the associated LDOs were compromised even if they are working after removing the shorts.

Regards,
Paul

0 Josh Green over 2 years ago in reply to peaves

Prodigy 90 points

Hi Paul,

I suspected as much, thank you for confirming this.

Thanks

0 Kallikuppa Sreenivasa over 2 years ago in reply to Josh Green

TI__Guru**** 193169 points

Hello Josh,

Thank you for the note.

Regards,

Sreenivasa

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AM623: Short circuits on CAP_VDDSx pins