Hello,
In order to meet specs, minimum VBUS is 4.75 V; maximum is 5.25V.
Generally, i.MX7 can work in device mode without VBUS, but it is needed to modify
software to disable VBUS detection.
But the following impacts should be taken in consideration:
1) i.MX7 may NOT detect plug in/out events, because the interrupt is triggered
by the VBUS level;
2) i.MX7 USB may NOT work at low power mode, because VBUS functions as the
wake-up source.
Have a great day,
Yuri
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------
Hello,
In order to meet specs, minimum VBUS is 4.75 V; maximum is 5.25V.
Generally, i.MX7 can work in device mode without VBUS, but it is needed to modify
software to disable VBUS detection.
But the following impacts should be taken in consideration:
1) i.MX7 may NOT detect plug in/out events, because the interrupt is triggered
by the VBUS level;
2) i.MX7 USB may NOT work at low power mode, because VBUS functions as the
wake-up source.
Have a great day,
Yuri
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------
We see that the 3.3V input and even lower to 1.8V, it can still work
unless we connect nothing. So, NXP can still accept the 4.75 as the
minimum?
Franky Hsu
Sercomm Corp.
2F, No.3-1, YuanQu St., Nankang, Taipei 115, Taiwan
+886-2-26553988 #2552
寄件者: "Yuri" <admin@community.nxp.com>
收件者: "Franky Hsu" <franky_hsu@sercomm.com>,
日期: 2017/12/14 下午 12:04
主旨: Re: - Re: IMX7D USB_OTG_VBUS allowed enable power
level?
NXP Community
Re: IMX7D USB_OTG_VBUS allowed enable power level?
reply from Yuri Muhin in i.MX Community - View the full discussion
Hello,
In order to meet specs, minimum VBUS is 4.75 V; maximum is 5.25V.
Generally, i.MX7 can work in device mode without VBUS, but it is needed
to modify
software to disable VBUS detection.
But the following impacts should be taken in consideration:
1) i.MX7 may NOT detect plug in/out events, because the interrupt is
triggered
by the VBUS level;
2) i.MX7 USB may NOT work at low power mode, because VBUS functions as the
wake-up source.
Have a great day,
Yuri