Hello Team,
I am using the STUSB4500 USB Power Delivery controller in my design.
I have designed my board by strictly following the reference schematic provided in the STUSB4500 datasheet. However, the board is not working as expected.
I have already tried the following:
Tested multiple firmware / configuration codes
Verified all register values according to the datasheet
Checked I²C communication and configuration writes
Despite this, the device does not negotiate higher PD voltages.
Issue Details:
VBUS_READY always remains false
Only default 5V is available on VBUS
Higher voltages (9V / 12V / 15V, etc.) are not being triggered
I want to trigger a higher PD voltage, but the negotiation does not complete successfully.
Could you please help me understand:
Possible reasons why VBUS_READY stays false
Any common hardware/firmware or configuration mistakes to check
Additional requirements for enabling higher PD voltage negotiation
Any guidance or suggestions would be highly appreciated.
Thank you for your support.
Best regards,
Noore Mujjasam
