TUSB321: Connecting VDD to VBUS

Sadanori Kato

Guru 36540 points

Part Number: TUSB321
Other Parts Discussed in Thread: TUSB542EVM

Hi,

Is it possible to use TUSB321, connecting VDD to VBUS with UFP mode?

Best regards,
Kato

0 Brian Zhou over 5 years ago

it is not recommended. It' better to use separate power supply

0 Sadanori Kato over 5 years ago in reply to Brian Zhou

Guru 36540 points

Hi Brian-san,

Thank you for your quick response.

Could you please tell me that reason why it isn't recommended to use TUSB321, connecting VDD to VBUS?

Best regards,
Kato

0 Sadanori Kato over 5 years ago in reply to Sadanori Kato

Guru 36540 points

Hi Brian-san,

It seems that VDD is directly connected to VBUSB_B in TUSB542EVM. So, could you please tell me this reason?

Best regards,
Kato

0 Brian Zhou over 5 years ago in reply to Sadanori Kato

for TUSB542EVM, for TUSb321, VDD and VBUS_det use differnet power, VDD is using VBUS_B, VBUS_DET is using VBUS_C

0 Sadanori Kato over 5 years ago in reply to Brian Zhou

Guru 36540 points

Hi Brian-san,

Thank you for your comment.

I understand.

Best regards,
Kato

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