USB-C audio port and charging

[VIJAY212]

HI 

USB-C Input (5–20 V PD) + USB-C Data (USB2.0 D+/D– to STM32H745) + charging phone at same time + Audio data transfer

Problem: 

When I connect the USB-C input supply (PD 5–20 V), the phone only charges and the audio USB port does NOT appear.
But when I do NOT provide PD input power, the audio USB port appears correctly.
And if the audio port is already active, then when I connect the PD input afterwards, the phone does NOT charge — only the audio stays active 

 

 

[FBL]

Hi @VIJAY212 

First, schematics in the screenshot are not clear!

Second, STM32H745 doesn't embed UCPD controller to manage power delivery. You need external PD IC or different MCU supporting UCPD controller to handle power delivery and transfer data.