topic Re: USB peripheral circuit on i.MX RT in i.MX RT Crossover MCUs

USB peripheral circuit on i.MX RT

er_arpit_arora — Tue, 26 Feb 2019 07:34:16 GMT

Hello, I want to build an SD card reader using i.MX RT1060.

I am wondering if there are any application notes or reference designs for building USB peripheral devices for i.MX RT series or similar processors.

I want some guidance (reference designs) around what inductors, ferrite beads, ESD protection components need to placed to form a USB peripheral device with i.MX RT1060.

Re: USB peripheral circuit on i.MX RT

fangfang — Wed, 27 Feb 2019 02:08:36 GMT

Hello,

Please refer to the information as the below:

URL:https://ww.w.nxp.com/docs/en/nxp/data-sheets/IMXRT1060IEC.pdf .

And reference designs please refer to the schematic of imxrt1060 EVK as the link.

URL:i.MX RT1060 Evaluation Kit | NXP .

Hope it help you.
Have a great day,
TIC

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Re: USB peripheral circuit on i.MX RT

er_arpit_arora — Thu, 28 Feb 2019 02:53:44 GMT

Hi Fang, thank you for your reply. The links you provided are definitely a good starting point. I had been through them already. I have 2 questions.

Question #1: If I have to design an SD card reader which plugs into the computers USB port, is it the USB OTG circuitry below which is relevant for my use, since the computer is going to act as the host.

Question #2: Could you please describe what does the USB POWER circuitry do (in the attached schematic)?

Thank you for your reply. I really appreciate it.

Re: USB peripheral circuit on i.MX RT

fangfang — Thu, 28 Feb 2019 07:17:47 GMT

You are welcome.

A: Yes, you may refer to the schematic,

Question #2: Could you please describe what does the USB POWER circuitry do (in the attached schematic)?

A: When USB_OTG1_ID is high. Beacause of the role of 2SK3018 MOSFET. The EN interface of NX5P3090UK is low. And then there is not output of 5V_USB_OTG. So the RT1050EVKB is "DEVICE".

When USB OTG To Host is connected to the RT1050EVKB , the USB OTG1 ID is automatically switched to a low level, So the EN interface of the NX5P3090UK is high. At this time, there is a 5V_USB_OTG output voltage, so the RT1050EVKB can be used as“HOST” .

Hope it help you.

Re: USB peripheral circuit on i.MX RT

er_arpit_arora — Mon, 04 Mar 2019 21:03:42 GMT

Ok thanks Fang, I think this is a good start. I need to read up on USB basics to make more sense.