Hello support team,
I would like to know about the HD3SS3212 SEL pin usage.
Two inputs for USB-type C are selected by SEL, but I will ask about how to use this SEL pin.
I am trying to switch the SEL by connecting or not connecting the CC pin of the USB cable.
On the cable side, CC1 pin is pulled up to VBUS (5 V) through 56 kΩ.
Therefore, it's pull down at 100 kΩ to connect it to the CC2 pin on the IC mounting side.
- When CC2 pin and SEL are connected: 3.2 V divided from 5 V at 56 kΩ and 100 kΩ appears as SEL and High is recognized.
- Conversely, when CC1 pin and SEL are connected: Low is recognized in SEL with PullDown of 100 kΩ.
As described above, I think that it is possible to switch the SEL pin High or Low by connecting 100 kΩ pull down and one side CC pin on the IC mounting side.
Could you let me know if there is any problem on this way?
Thank you and best regards,
Kaizawa