Hallo

I have a question regarding USB in the LPC2478.

Is it possible to use the USB as a host, if I done use the signal
USB_POWERx and USB_OVERCRx ?

Im planing on using those GPIO's for something else. Its not clearly in
the LPV2478 data sheet.

/Thomas
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USB_POWERx is the port power enable pin, you can always
apply power from the host port. However, USB_OVERCRx is an
over-current signal from the device, if you don't use it,
what would happen if you plug in a bad USB device?

Take a look at MIC2025 spec., normally, "EN" pin tied to
USB_POWERx while "FLG" pin tied to USB_OVERCRx.

Cheers,
Tom
--- In l..., "ostehaps01" wrote:
>
> Hallo
>
> I have a question regarding USB in the LPC2478.
>
> Is it possible to use the USB as a host, if I done use the signal
> USB_POWERx and USB_OVERCRx ?
>
> Im planing on using those GPIO's for something else. Its not clearly in
> the LPV2478 data sheet.
>
> /Thomas
>

Start a New Thread

Ok, I see

The USB has a USB_PPWR and a USB_PWRD/Vbus.
I guess the USB_PPWR supply power for the USB device, but the
USB_PWRD/Vbus. What thats for?

/Thomas
>
> USB_POWERx is the port power enable pin, you can always
> apply power from the host port. However, USB_OVERCRx is an
> over-current signal from the device, if you don't use it,
> what would happen if you plug in a bad USB device?
>
> Take a look at MIC2025 spec., normally, "EN" pin tied to
> USB_POWERx while "FLG" pin tied to USB_OVERCRx.
>
> Cheers,
> Tom
> --- In l..., "ostehaps01" wrote:
> >
> > Hallo
> >
> > I have a question regarding USB in the LPC2478.
> >
> > Is it possible to use the USB as a host, if I done use the signal
> > USB_POWERx and USB_OVERCRx ?
> >
> > Im planing on using those GPIO's for something else. Its not
clearly in
> > the LPV2478 data sheet.
> >
> > /Thomas
>
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USB_PPWR is used when port is configured as USB Host, it's
an output signal to drive the VCC charge pump. VBus is an
input signal when port is configured as Device, indicating when
power is present or not at the USB connector.

regards,
Tom
--- In l..., "ostehaps01" wrote:
>
> Ok, I see
>
> The USB has a USB_PPWR and a USB_PWRD/Vbus.
> I guess the USB_PPWR supply power for the USB device, but the
> USB_PWRD/Vbus. What thats for?
>
> /Thomas
> >
> > USB_POWERx is the port power enable pin, you can always
> > apply power from the host port. However, USB_OVERCRx is an
> > over-current signal from the device, if you don't use it,
> > what would happen if you plug in a bad USB device?
> >
> > Take a look at MIC2025 spec., normally, "EN" pin tied to
> > USB_POWERx while "FLG" pin tied to USB_OVERCRx.
> >
> > Cheers,
> > Tom
> >
> >
> > --- In l..., "ostehaps01" wrote:
> > >
> > > Hallo
> > >
> > > I have a question regarding USB in the LPC2478.
> > >
> > > Is it possible to use the USB as a host, if I done use the signal
> > > USB_POWERx and USB_OVERCRx ?
> > >
> > > Im planing on using those GPIO's for something else. Its not
> clearly in
> > > the LPV2478 data sheet.
> > >
> > > /Thomas
> > >
>
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