Kinetis Microcontrollers中的主题 Re: K81 USB

K81 USB

abhishektiwari — Tue, 19 Sep 2017 08:58:06 GMT

We are trying to design a custom board for access control using K81 secure controller. Here I wish to add two USB interfaces,One as MicroUSB (for device,can be used to power the board) and other as Type A USB(for Host). Plz. suggest how it can be done as I observes only single USB connection in controller.
Looking forward for early inputs.

Re: K81 USB

mjbcswitzerland — Wed, 20 Sep 2017 11:04:54 GMT

The K81 has one LS/FS USB controller.

You could use a dummy device connector just for charging and connect an OTG connector for host/device operations.

Alternatively you may be able to connect the USB wires to two connectors as long as only one is connected at a time - in this case you may need a configuration to switch between device and host modes.

Regards

Mark

Re: K81 USB

abhishektiwari — Thu, 21 Sep 2017 03:59:50 GMT

Thankyou Mark.

Plz. clarify ;

1-- If I want to use use microUSB for power and debugging. And Type A USB for Host, how can it be done. Both may be used simultaneous too.

2- Can u please help me understand your above reply with any reference design available at your end.

3-I am not bale to find USB pins in K81,can you plz. point it out.

Thanks to you.

Re: K81 USB

mjbcswitzerland — Thu, 21 Sep 2017 23:20:19 GMT

Maybe you could put an OpenSDA K20 on the board to give it debugging capability and USB device - then use the K81's USB as host on the other connector?

The USB pins are called USB0_DP and USB0_DM.

Regards

Mark

http://www.utasker.com/kinetis.html
http://www.utasker.com/kinetis/FRDM-K82F.html
http://www.utasker.com/kinetis/TWR-K80F150M.html