Overview:
The USB HUB is connected between the Host and the Device, and multiple USB device interfaces can be expanded, so that a Host can simultaneously perform data connection with multiple Devices.
Note: Generally speaking, one HUB expansion chip can expand 4 USB downstream interfaces. The 1 to 7 HUBs on the market generally use two HUB expansion chips, and the upstream port of one HUB expansion chip is connected to the other. The downlink port of the HUB expansion chip.
Solution introduction:
Under normal circumstances, both the USB HUB and the downstream port device need to be powered by the Host to work. If the laptop has only one Type-C interface, the computer cannot be charged when using the USB HUB, which will greatly damage the laptop. The standby time is long, so it is necessary to develop a USB HUB with charging function.
The solution is as follows (not only has the charging function, but also supports PD and QC fast charging):
The USB HUB fast charging solution is mainly used for the function expansion of the Type-C interface, which can conveniently implement Type-C expansion USB2.0/3.0 interface, DP/VGA/HDMI display interface, Type-C charging port and other applications.
The USB HUB fast charging solution uses the single-chip microcomputer LDR6020 integrated with the PD protocol for PD communication negotiation, video Alt Mode/USB peripheral function switching and coordination, etc. The USB HUB expansion chip LDR334 is used for USB coordination and expansion of multiple USB2.0 downstream port.