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Regarding low Power USB2.0 Hub controller CY7C65631­56LTXI | Cypress Semiconductor

Regarding low Power USB2.0 Hub controller CY7C65631­56LTXI

Summary: 3 Replies, Latest post by Dinesh Katkar on 16 Jan 2016 07:54 AM PST
Verified Answers: 0
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Dinesh Katkar's picture
3 posts



Greetings of the Day!!!


I am Dinesh Katkar, I would like to share my product block diagram,where I have selected Cypress chip CY7C65631­56LTXI for USB hub.I would like to request you to provide the support for the same.

I have selected USB upstream port as 10118192-0001LF Micro-USB connector and USB downstream 4 ports as below..

1. 2 ports of hub for Dual USB connector-61400826021 port of hub for USB to ethernet controller chip-(LAN9500I­ABZJ) port of hub for thermocouple reading through USB to SPI converter...

I am bit confused with USB upstream port Micro-USB connector ? Can we use MicroUSB connector to connect this with RPi model B and will do controlling through Raspberry board.

Also I found reference design for USB2.0 hub ,where I found 2 VBUS power switches MIC2026-2YM from micrel.Is it necessary?

 Looking forward for your positive response regarding support for Micro-USB connector selection as USB upstream port and 2 VBUS power switch requirements and suggest me if any modifications is required in my end product...

kindly see the attached block diagram for the reference....

Thanks and Warm Regards,

Dinesh katkar

VAVC's picture
Cypress Employee
506 posts


If you want USb certification, you need to have power switches which turn off the power to the downstream port when it draws more than current(>100mA for self powered HUB and >500mA for bus powered HUB).


You can use micro- B connector on the upstream port of HUB.






Dinesh Katkar's picture
3 posts

Dear Vikas,


Thank you for your positive response!!!

I used Cypress USB hub 4 port CY7C65631 ,2 downstream port from usb hub is going to USB dual connector ,one downstream port to USB -Ethernet IC and one downstream port to USB -SPI for thermocuouple readings.

I have one doubt as  USB upstream port is coming from Rapsberry Pi...and how to program the USB hub and USB to ethernet hub as both having EEPROM and can program using ISP.My question is how to program whether on board any JTAG is required or SPI lines should required to interface with external microcontroller for programming the USB hub


Kindly see the attached block diagram


Dinesh Katkar's picture
3 posts


I tested the board,but when I connect port of the USB hub to my computer then there will be alert message saying ""power surge - usb is getting lower power than it normally requires"".

Please guide me in design of USB hub..


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