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USB Superspeed Peripherals

NaMo_1534561
Contributor II

Hello,

Is there a recommended power supply circuit diagram when using fx3S with self power?

Please tell me about the processing of the VBUS and VBATT terminals.

Best Regards,

Naoaki Morimoto

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1 Solution
HirotakaT_91
Moderator
Moderator

Hi Morimoto-san,

Thank you for sharing detailed information.

Your suggestion seems good except VBATT setting.

In case of the VBATT usage, CYUSB3KIT-001 schematic might be helpful.

On your suggested power supply, FX3 is not supplied any power when USB (VBUS) is not connected to it.

In case of self-powered device, VBATT can use for resolving above issue.

Following graphics are excerpts of CYUSB3KIT-001 schematic.

pastedImage_0.png

pastedImage_1.png

pastedImage_2.png

Best regards,

Hirotaka Takayama

View solution in original post

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4 Replies
HirotakaT_91
Moderator
Moderator

Hello Morimoto-san,

In terms of basic hardware design, please follow AN70707 - EZ-USBR FX3/FX3S Hardware Design Guidelines and Schematic Checklist.

- CYUSB3KIT-003 is helpful as example circuit design, but as you know, it is not self-powered design, but bus-powered design.

- Although we attached FX3S DVK which supports self-powered on FX3S web page, this board created by Pactron Inc. If they do not offer it, we cannot access to their schematic.

- CYUSB3KIT-001 can work as self-powered device. As you know, however, this product has obsoleted. Cypress does not recommend it officially.

Best regards,

Hirotaka Takayama

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NaMo_1534561
Contributor II

Takayama-san,

Thank you for your answer.

I will suggest to customer the connection of power supply domains for self-powerd application.

Please check below.

VBAT --> Leave open

VBUS --> Connect to VBUS of USB Type-A Plug.

VIO_1 (GPIF)    --> connect to system power supply(1.8V to 3.3V)

VIO_2 (S0 port) --> connect to system power supply(1.8V to 3.3V)

VIO_3 (S1 port) --> connect to system power supply(1.8V to 3.3V)

VIO_4 (S1 port and Low Speed Peripherals (UART/SPI/I2S)) --> connect to system power supply(1.8V to 3.3V)

VIO_5 (I2C) --> connect to system power supply(1.8V to 3.3V)

VDD  --> connect to system power supply(1.2V)

AVDD --> connect to system power supply(1.2V)

CVDDQ--> connect to system power supply(1.8V or 3.3V which clock required to)

U3RXVDDQ --> connect to system power supply(1.2V)

U3TXVDDQ --> connect to system power supply(1.2V)

OTG_ID --> Leave open if application does not support On-the-Go.

Best Regards,

Naoaki Morimoto

0 Likes
HirotakaT_91
Moderator
Moderator

Hi Morimoto-san,

Thank you for sharing detailed information.

Your suggestion seems good except VBATT setting.

In case of the VBATT usage, CYUSB3KIT-001 schematic might be helpful.

On your suggested power supply, FX3 is not supplied any power when USB (VBUS) is not connected to it.

In case of self-powered device, VBATT can use for resolving above issue.

Following graphics are excerpts of CYUSB3KIT-001 schematic.

pastedImage_0.png

pastedImage_1.png

pastedImage_2.png

Best regards,

Hirotaka Takayama

View solution in original post

0 Likes
NaMo_1534561
Contributor II

Takayama-san,

Thnak you for checking my suggestion and giving a feedback.

I'm clear on this question by your answer.

Best Regards,

Naoaki Morimoto

0 Likes