Dear support,
I am using the TUSB2046B Hub in self-power mode (i.e., I have my power supply not using VBUS), and I am using 2 USB downstream to external stacked USB TypeA connectors, and one USB to talk to the Main Microcontroller on board. The microcontroller has its own VBUS_DETECT pin which is used to signal the micro a host is available. There is an note on the Micro that during booting the state of VBUS_DETECT should be low so that it doesn't enter a different boot sequence. If the hub provides a high on VBUS_DET the micro will hang there because it will never be enumerated by the upstream host.
To meet this requirement, I am trying logically AND the VBUS from the Upstream connector via voltage divider and PWRON3_N pin. However, I want to know:
Does PWRON3_N goes low always as soon as it the hub chip gets VCC, or does it go low only when the hub knows a peripheral is wiggling D+/D- lines attempting to enumerate?
There is no mention on the datasheet the behavior of PWRONX_N pins. So I don't want to assume anything. Please advise
