I am trying to make my own USB hub using USB7216 IC, and trying to understand how should I power the 'VCORE' pin.
Based on the datasheet, it should receive a ~1.15V power:
But it looks odd to me that:
- the schematic they posted at page 7 and page 26 does not show the voltage of VCORE:
Usually, the ICs that I use like 232rl and USB isolators, create the voltage to power their internal logic from the main power (3.3V or 5V) on their own, and do not need a second, separate power.
Powering ICs at 1.15V is something I hear for the first time. Usually I see power specifications as low as 3.3V.
But since the datasheet says I need to use an external Power of 1.15V, I will.
I just want to hear your thoughts I want to know if there is any hint I missed, or someone with more experience on usb hubs can tell me that powering such ICs with voltage lower to 3.3V is common. After all, there are not many tutorials on USB hubs.
When I use the IC, I will also check powering it only at 3.3V, and see its VCORE pin, if it generates this 1.15V on its own.