What is the Function of VC bit from OTGSC register of LPC4350 controller?

[soorajkumar]

Hi,

I am interested in knowing the detailed working of VC bit in OTGSC register. I would like to know whether it can provide internal VBUS signal without any additional peripheral circuitry being added to the controller.?

Please respond soon.

Thanks ,

Sooraj.

[soledad]

Hello Sooraj,

For self-powered USB products that only use USB0 and that do not run in OTG mode,USB0_VBUS can be left disconnected as long as the VC bit in the OTGSC register is set.When this bit is set a voltage is applied to the USB0_VBUS pin internally which is theequivalent of connecting the pin to a 5 V VBUS supply. Keeping the USB0_VBUSdisconnected, ensures that OTG VBUS line pulsing does not go towards the cable.

Have a great day,
Sol

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[soorajkumar]

Hi,

The device we have developing will be deployed in field application. So, if

there is any removal or re insertion of USB cable, it might have affect on

this bit. The entire USB communication will be disturbed if due to some

event the VC bit gets reset which inturn will turn off the VBUS supply.

So, is this a recommended solution (because it is not a hobby project ,but

will be a product)? or implementing the VBUS_SIGNAL through the hardware

will be a better and durable solution????

please respond as soon as possible.

thanks,

Sooraj.

Siemens

-Sooraj.

[soorajkumar]

Hi,

The device we have developing will be deployed in field application. So, if there is any removal or re-insertion of USB cable, it might have affect on this bit. The entire USB communication will be disturbed if due to some event the VC bit gets reset which inturn will turn off the VBUS supply.

So, is this a recommended solution? or implementing the VBUS_SIGNAL through the hardware will be a better and durable,robust solution????

please respond as soon as possible.

thanks,

Sooraj

Siemens