Hi NXP team,
I have an issue with FS6520 VAUX output that need your help. The hardware schametics are attached.
The select pin-31 is connected a 24 kohm resistor. The DEBUG mode is enabled by connecting Pin-15 DEBUG to a voltage divided from VPRE 6.5V. SW_CORE is confirmed to output around 1.25V.
VCCA and VAUX are both connected to an external PNP transistor (BCP52-16,115). On output of VCCA, an 3.28V output voltage can be measured on Pin-43 VCCA, and it's around 5.9V on VCCA_B and 6.6V on VCCA_E. However, on pin-38 VAUX, it's close to 0V, and it's around 7.8V on VAUX_B and 8.2V on VAUX_E.It looks FS0B is also pulled down LOW.
Currently there's no SPI or software available. It will be appreciated if you can provide any suggestions to debug this issue. Thanks a lot in advance!
Regards,
Lync
