AnsweredAssumed Answered

i.MX6DualLite : USB_H1_VBUS  behavior on unpowered processor

Question asked by koichi sakagami on Jan 19, 2015
Latest reply on Feb 3, 2015 by Zongbiao Liao

Dear community,

 

We are investigating the USB_H1_VBUS  behavior on custom board.

 

We know that
In i.MX6 USB VBUS can be powered any time,even to unpowered processor
from IMX6DLIEC sect.4.2.1 Power-Up Sequence.
USB_OTG_VBUS and USB_H1_VBUS are not part of the power supply
sequence and can be powered at any time.

 

[Background]
In the case of the i.MX6 powers off ,while the USB_OTG_VBUS is added with 5V,
the USB_H1_VBUS remains about 5 V.

When the i.MX6 powers off, on impressing a 5V to  the USB_OTG_VBUS,
the USB_H1_VBUS remains about 5 V.

 

Meantime,
in the case of  i.MX6 never power on ,
even if the USB_OTG_VBUS is added with 5V,
the USB_H1_VBUS does not appear 5 V.

 

[Question]
We think that this behavior is caused for the description in the datasheet IMX6SDLIEC 4.3.2.3 LDO_USB.
Is my understanding right ?

 

Best Regards,
Koichi Sakagami

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