USB-C PD: STUSB4500 FTP_KEY changable?

[CWei .1]

Hello ST

I would like to ask about is it possible to change the STUSB4500 FTP_KEY default values through SMBUS interface? If its possible, could you suggest the appropriate step to do so?

[Didier HERROUIN]

Dear CWei.1,

I am not sure to understand your request.
Actually, when you need to access the STUSB4500 registers, as a first step, you must write the customer access key into the FTP_KEY register using the I2C bus.

This procedure is described in the document attached. Does it answer your request ?

[CWei .1]

Hello

I have reviewed the document. Could you please clarify whether the default values of FTP_KEY are fixed, or if they can be modified and configured to user-defined values?

[Didier HERROUIN · Accepted solution]

Dear CWei.1,

The procedure to write/read the registers is fixed, including the FTP_KEY values.