About remaining the VDDUSB_CAP voltage in i.MX6DQ.

[keitanagashima]

Dear All,

On custom board, VDDUSB_CAP connected 10uF and 0.1uF capacitors.

(On SABRE-SD, VDDUSB_CAP connected 10uF [C627] and 0.22uF [C633] capacitors.)

Because the discharge time of VDD_USB_CAP is too late, there is possibility of remaining the 0.6V voltage at the next Power ON.

Is there a problem in this voltage (0.6V)?

If the voltage cause the problem, could you tell me the workaround?

Best Regards,

Keita

[igorpadykov · Accepted solution]

Hi Keita

there is no problem in this voltage since it produced from

USB_OTG_VBUS (or USB_H1_VBUS) and they are not part

of the power supply sequence and can be powered at any time,

as stated in sect.4.2.1 Power-Up Sequence i.MX6DQ Datasheet (rev.4, 7/2015)

http://cache.freescale.com/files/32bit/doc/data_sheet/IMX6DQCEC.pdf

Best regards

igor

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[keitanagashima]

Dear Igor,

Hello.

Thank you for your quick reply.

OK. I got it.

Best Regards,

Keita