I have a board on which is USB powered. But after enumeration, the VID and PID is 0, not
the default values.
I dout that 5509A can't be used in USB powered application. Is that right?

Thx

Chao Xiang

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USB provides for low power device (<100mA@5v) and high power device 
(<500mA@5v). But even for high power device, enumeration starts as low 
power device. Whether a device can be USB powered is majorly decided by 
your board design, the total power consumered by the board. I have 
device designed with 5506 working as low power device without any 
problem. I believe 5509A's power comsumption is also in the same range. 
If your device failed, it's not because of 5509A but rather some power 
hunger IC on the board.

Wei

--- In c...@yahoogroups.com, Xiang Chao <xiangchao891@...> wrote:
>
> I have a board on which is USB powered. But after enumeration, the 
VID and PID is 0, not the default values.
> I dout that 5509A can't be used in USB powered application. Is that 
right?
> 
> Thx
> 
> Chao Xiang
>

______________________________
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Li Wei-

> USB provides for low power device (<100mA@5v) and high power device
> (<500mA@5v). But even for high power device, enumeration starts as low
> power device. Whether a device can be USB powered is majorly decided by
> your board design, the total power consumered by the board. I have
> device designed with 5506 working as low power device without any
> problem. I believe 5509A's power comsumption is also in the same range.
> If your device failed, it's not because of 5509A but rather some power
> hunger IC on the board.

That's a great answer, due to your experience.  One question -- if the board would
consume 500 mA, would the 550x have to wait for acknowledgement of high power device
enumeration before allowing the board to consume 500 mA?  I.e. should there be some
type of dynamic power control circuitry on the board under 550x control?

Thanks.

-Jeff

> --- In c...@yahoogroups.com, Xiang Chao <xiangchao891@...> wrote:
> >
> > I have a board on which is USB powered. But after enumeration, the
> VID and PID is 0, not the default values.
> > I dout that 5509A can't be used in USB powered application. Is that
> right?
> >
> > Thx
> >
> > Chao Xiang

______________________________
New Year Gift for Members of DSPRelated.com.  Details here.

Thank you for your advice. I used a 5V power supplier to the board without =
USB cable connect.
My board consumes about 170mA. After pluging the cable in, the current read=
 0 and the problem remains.
Should I cut off the USB +5V power line when a standalone power supplier is=
 used?

----- =D4=AD=CA=BC=D3=CA=BC=FE ----
=B7=A2=BC=FE=C8=CB=A3=BA iewil2000 <l...@gmail.com>
=CA=D5=BC=FE=C8=CB=A3=BA c...@yahoogroups.com
=D2=D1=B7=A2=CB=CD=A3=BA 2008/1/7(=D6=DC=D2=BB), =C9=CF=CE=E710:42:18
=D6=F7=CC=E2=A3=BA [c55x] Re: Can 5509A be used in USB powered application?

=20=20
=20=20=20=20
            USB provides for low power device (<100mA@5v) and high power de=
vice=20

(<500mA@5v). But even for high power device, enumeration starts as low=20

power device. Whether a device can be USB powered is majorly decided by=20

your board design, the total power consumered by the board. I have=20

device designed with 5506 working as low power device without any=20

problem. I believe 5509A's power comsumption is also in the same range.=20

If your device failed, it's not because of 5509A but rather some power=20

hunger IC on the board.

Wei

--- In c55x@yahoogroups. com, Xiang Chao <xiangchao891@ ...> wrote:

>

> I have a board on which is USB powered. But after enumeration, the=20

VID and PID is 0, not the default values.

> I dout that 5509A can't be used in USB powered application. Is that=20

right?

>=20

> Thx

>=20

> Chao Xiang

>

=20
______________________________
New Year Gift for Members of DSPRelated.com.  Details here.

Xiang Chao,

No, you shouldn't cut off +5V power line. But instead you should=20
change the device discriptor in firmware from USB powered to wall=20
powered. I think you have to read the schematics to get a whole=20
picture of the problem. I don't understand why wall power comsumption=20
drops to 0 when you plug in.

Wei=20

--- In c...@yahoogroups.com, Xiang Chao <xiangchao891@...> wrote:
>
> Thank you for your advice. I used a 5V power supplier to the board=20
without USB cable connect.
> My board consumes about 170mA. After pluging the cable in, the=20
current read 0 and the problem remains.
> Should I cut off the USB +5V power line when a standalone power=20
supplier is used?
>=20
> ----- =D4=AD=CA=BC=D3=CA=BC=FE ----
> =B7=A2=BC=FE=C8=CB=A3=BA iewil2000 <liwei2000@...>
> =CA=D5=BC=FE=C8=CB=A3=BA c...@yahoogroups.com
> =D2=D1=B7=A2=CB=CD=A3=BA 2008/1/7(=D6=DC=D2=BB), =C9=CF=CE=E710:42:18
> =D6=F7=CC=E2=A3=BA [c55x] Re: Can 5509A be used in USB powered applicatio=
n?
>=20
>=20
>=20
>=20
>=20
>=20
>=20
>=20
>=20
>=20
>=20
>=20
>=20
>             USB provides for low power device (<100mA@5v) and high=20
power device
>=20
> (<500mA@5v). But even for high power device, enumeration starts as=20
low
>=20
> power device. Whether a device can be USB powered is majorly=20
decided by
>=20
> your board design, the total power consumered by the board. I have
>=20
> device designed with 5506 working as low power device without any
>=20
> problem. I believe 5509A's power comsumption is also in the same=20
range.
>=20
> If your device failed, it's not because of 5509A but rather some=20
power
>=20
> hunger IC on the board.
>=20
>=20
>=20
> Wei
>=20
>=20
>=20
> --- In c55x@yahoogroups. com, Xiang Chao <xiangchao891@ ...> wrote:
>=20
> >
>=20
> > I have a board on which is USB powered. But after enumeration, the
>=20
> VID and PID is 0, not the default values.
>=20
> > I dout that 5509A can't be used in USB powered application. Is=20
that
>=20
> right?
>=20
> >
>=20
> > Thx
>=20
> >
>=20
> > Chao Xiang
>=20
>

=20
______________________________
New Year Gift for Members of DSPRelated.com.  Details here.

Wei-

> USB port on PC will not give 500mA until enumeration as high power
> device finished. I will try to keep auxiliary circuitry, such as A/D
> and D/A, powered down until enumeration finished. If 55x itself plus
> boot flash need more than 100mA, which is very rare to my knowledge,
> then I guess we have to run 55x at very low clock rate in the
> beginning to save power.

Ok I get it.  Use every trick to stay under 100 mA until permission granted.  Thanks.

Sounds to me like you have mastered C550x + USB design :-)

-Jeff

> --- In c...@yahoogroups.com, Jeff Brower <jbrower@...> wrote:
> >
> > Li Wei-
> >
> > > USB provides for low power device (<100mA@5v) and high power
> device
> > > (<500mA@5v). But even for high power device, enumeration starts
> as low
> > > power device. Whether a device can be USB powered is majorly
> decided by
> > > your board design, the total power consumered by the board. I have
> > > device designed with 5506 working as low power device without any
> > > problem. I believe 5509A's power comsumption is also in the same
> range.
> > > If your device failed, it's not because of 5509A but rather some
> power
> > > hunger IC on the board.
> >
> > That's a great answer, due to your experience.  One question -- if
> the board would
> > consume 500 mA, would the 550x have to wait for acknowledgement of
> high power device
> > enumeration before allowing the board to consume 500 mA?  I.e.
> should there be some
> > type of dynamic power control circuitry on the board under 550x
> control?
> >
> > Thanks.
> >
> > -Jeff
> >
> > > --- In c...@yahoogroups.com, Xiang Chao <xiangchao891@> wrote:
> > > >
> > > > I have a board on which is USB powered. But after enumeration,
> the
> > > VID and PID is 0, not the default values.
> > > > I dout that 5509A can't be used in USB powered application. Is
> that
> > > right?
> > > >
> > > > Thx
> > > >
> > > > Chao Xiang

______________________________
New Year Gift for Members of DSPRelated.com.  Details here.

Jeff,

USB port on PC will not give 500mA until enumeration as high power 
device finished. I will try to keep auxiliary circuitry, such as A/D 
and D/A, powered down until enumeration finished. If 55x itself plus 
boot flash need more than 100mA, which is very rare to my knowledge, 
then I guess we have to run 55x at very low clock rate in the 
beginning to save power.

Wei 

--- In c...@yahoogroups.com, Jeff Brower <jbrower@...> wrote:
>
> Li Wei-
> 
> > USB provides for low power device (<100mA@5v) and high power 
device
> > (<500mA@5v). But even for high power device, enumeration starts 
as low
> > power device. Whether a device can be USB powered is majorly 
decided by
> > your board design, the total power consumered by the board. I have
> > device designed with 5506 working as low power device without any
> > problem. I believe 5509A's power comsumption is also in the same 
range.
> > If your device failed, it's not because of 5509A but rather some 
power
> > hunger IC on the board.
> 
> That's a great answer, due to your experience.  One question -- if 
the board would
> consume 500 mA, would the 550x have to wait for acknowledgement of 
high power device
> enumeration before allowing the board to consume 500 mA?  I.e. 
should there be some
> type of dynamic power control circuitry on the board under 550x 
control?
> 
> Thanks.
> 
> -Jeff
> 
> > --- In c...@yahoogroups.com, Xiang Chao <xiangchao891@> wrote:
> > >
> > > I have a board on which is USB powered. But after enumeration, 
the
> > VID and PID is 0, not the default values.
> > > I dout that 5509A can't be used in USB powered application. Is 
that
> > right?
> > >
> > > Thx
> > >
> > > Chao Xiang
>

______________________________
New Year Gift for Members of DSPRelated.com.  Details here.

Wei,
Thx for your advice. It seems that when plugin the USB
cable, the +5V of my computer is connected with output
of power supplier. Then the computer provide the
necessary power for my board, and the supplier read 0.
I have found the cause of my problem, it is not about
the power supply, but a wrong pull-up resister.
btw, i got problem with interrupt interference. I
state it in a new thread, maybe you can read it and
give me some advice.

Xiang Chao
--- iewil2000 <l...@gmail.com>дµÀ:

> Xiang Chao,
> 
> No, you shouldn't cut off +5V power line. But
> instead you should 
> change the device discriptor in firmware from USB
> powered to wall 
> powered. I think you have to read the schematics to
> get a whole 
> picture of the problem. I don't understand why wall
> power comsumption 
> drops to 0 when you plug in.
> 
> Wei 
> 
> --- In c...@yahoogroups.com, Xiang Chao
> <xiangchao891@...> wrote:
> >
> > Thank you for your advice. I used a 5V power
> supplier to the board 
> without USB cable connect.
> > My board consumes about 170mA. After pluging the
> cable in, the 
> current read 0 and the problem remains.
> > Should I cut off the USB +5V power line when a
> standalone power 
> supplier is used?
> > 
> > ----- ԭʼÓʼþ ----
> > ·¢¼þÈË£º iewil2000 <liwei2000@...>
> > ÊÕ¼þÈË£º c...@yahoogroups.com
> > ÒÑ·¢ËÍ£º 2008/1/7(ÖÜÒ»), ÉÏÎç10:42:18
> > Ö÷Ì⣺ [c55x] Re: Can 5509A be used in USB powered
> application?
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> >             USB provides for low power device
> (<100mA@5v) and high 
> power device
> > 
> > (<500mA@5v). But even for high power device,
> enumeration starts as 
> low
> > 
> > power device. Whether a device can be USB powered
> is majorly 
> decided by
> > 
> > your board design, the total power consumered by
> the board. I have
> > 
> > device designed with 5506 working as low power
> device without any
> > 
> > problem. I believe 5509A's power comsumption is
> also in the same 
> range.
> > 
> > If your device failed, it's not because of 5509A
> but rather some 
> power
> > 
> > hunger IC on the board.
> > 
> > 
> > 
> > Wei
> > 
> > 
> > 
> > --- In c55x@yahoogroups. com, Xiang Chao
> <xiangchao891@ ...> wrote:
> > 
> > >
> > 
> > > I have a board on which is USB powered. But
> after enumeration, the
> > 
> > VID and PID is 0, not the default values.
> > 
> > > I dout that 5509A can't be used in USB powered
> application. Is 
> that
> > 
> > right?
> > 
> > >
> > 
> > > Thx
> > 
> > >
> > 
> > > Chao Xiang
> > 
> > >
> 
      ___________________________________________________________ 
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