The operating range of i.MX8M-Mini USB1_VBUS/USB2_VBUS

[james_wu]

According to the i.MX8M-Mini Datasheet, the operating range of USB1_VBUS and USB2_VBUS is from 0.8V to 3.6V.
And the absolute maximum rating is 3.95V.

• https://www.nxp.com/docs/en/data-sheet/IMX8MMCEC.pdf 

But the voltage level of USB1_VBUS and USB2_VBUS on the i.MX8M-Mini EVK Base Board is still 5V.

• https://www.nxp.com/downloads/en/design-support/8MMINILPD4-EVK-DESIGNFILES.zip

Any impact or side effect if we use 5V on USB1_VBUS/USB2_VBUS for a long term usage?

[igorpadykov · Accepted solution]

Hi James

on i.MX8M Mini EVK schematic (SPF-31399) processor USBn_VBUS is connected

through R108/109 30K. According to Table 11-76. External Signals i.MX8MMini Reference Manual
https://www.nxp.com/docs/en/reference-manual/IMX8MMRM.pdf

The PHY VBUS0 pin must not connect directly to the 5v VBUS voltage
on the USB2.0 link. The PHY VBUS0 pin must be isolated by an external resistor
(REXT1) so that the PHY VBUS0 pin sees a lower voltage.

Design Tool
i.MX 8M Mini Evaluation Kit Design Files
i.MX 8M Mini Evaluation Kit | NXP 

Best regards
igor
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