CONNECTING AND SETUP
YKUSH 3
Yepkit USB 3.1 Switchable Hub
For most use cases the External Powered mode is preferable to avoid instabilities due to insufficient power due to
upstream port power constrains on the host side. Use Bus Powered mode when only low consumption USB devices
are to be connected to the downstream ports of the YKUSH 3.
4
Selecting power input mode (Bus/Externally Powered)
Power Input Mode
Select Jumper
The power input mode is selected through
the on-board jumper indicated in this
picture.
The boards are set at factory with the
jumper in the Bus Powered position
(
VBUS
). If the board is intended to be
powered by an external 5V power supply
the user should move the jumper to the
Externally Powered position (
VEXT
).
Bus Powered (VBUS)
Self/Externally Powered (VEXT)
In Bus Powered mode (jumper at VBUS position), all power necessary to source the
YKUSH 3 internal circuitry and the power demands from the USB devices connected to
to YKUSH 3 downstreams is sourced from the Upstream VBUS. This has obvious
limitations imposed by the current sourcing capability of the Host port to which the
YKUSH 3 upstream is connected, and should only be used when just low powered
devices are to be connected to the YKUSH 3.
In Externally Powered mode (jumper at VEXT position), all power is sourced from an
external 5V power supply. This external power supply must have enough current
capacity to source the internal YKUSH 3 circuitry and all USB devices attach to the
downstream ports.
Ensure the external power supply output voltage
does not exceed 5.4VDC
.
