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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

.

Summary of Contents for YKUSH 3

Page 1: ...YKUSH 3 Yepkit USB 3 1 Switchable Hub User Manual Version 1 0 0...

Page 2: ...INDEX YKUSH 3 Yepkit USB 3 1 Switchable Hub CONNECTING AND SETUP 2 PRODUCT OVERVIEW 1 USING IT 3 CONTROL PROTOCOL 4 1 APPENDIX REVISION HISTORY A...

Page 3: ...us powered or Self Externally powered Full downstream ports switching both VBUS power and data lines ICSP programming interface for loading new firmwares Loaded with a Bootloader for firmware updates...

Page 4: ...connected then the Self External Powered mode external power supply is recommended To use the advanced board functionalities a software component must be installed in the host system or custom develo...

Page 5: ...ld 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...

Page 6: ...ber 1 Downstream port 1 2 Downstream port 2 3 Downstream port 3 a All downstream ports e Additional 5V switchable power output value Value to be written used The s serial_number parameter is optional...

Page 7: ...ykushcmd ykush3 d 1 Switch ON UP the downstream port 1 ykushcmd ykush3 u 1 Get status of downstream port 2 ykushcmd ykush3 g 2 List the serial numbers of the connected boards ykushcmd ykush3 l Switch...

Page 8: ...e downstream USB ports This in board microcontroller is visible to the host system as an HID USB device with the following details Vendor ID VID 0x04D8 Product ID PID 0xF11B The communication protocol...

Page 9: ...APPENDIX REVISION HISTORY YKUSH 3 Yepkit USB 3 1 Switchable Hub 8 Initial release Revision 1 0 0 10 2017...

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