Am Mittwoch, 13. Juni 2007 06:50 schrieb Vortex:
> Hello!
>
> I investigated the setup again at last weekend.
>
> Somebody on linux-usb Mailinglist explaind the "failed with status
> 50" message. And so i decided to check the waveforms on D+ and D-.
> I've discovered that there is a complete im
Hi,
Vortex:
> I've discovered that there is a complete impedance missmatch between
> the ds2490 and the usb-port of this laptop.
> In the datasheet from dallas there are 30pF capacitors recomended
> on D+ and D-. But on the Notebook side there are at least 300pf
> expected. So i have added capacit
Hello!
I investigated the setup again at last weekend.
Somebody on linux-usb Mailinglist explaind the "failed with status
50" message. And so i decided to check the waveforms on D+ and D-.
I've discovered that there is a complete impedance missmatch between
the ds2490 and the usb-port of this
Am Dienstag, 5. Juni 2007 09:48 schrieb Vortex:
> > Increasing the capacitors make things *worse*, not better! Empty
> > capacitors are like short circuits. You have to limit the current flowing
> > into empty capacitors by applying a resistor or (better) a choke coil to
> > the supply lines.
>
> B
Hello Jan!
> OP: original posting/poster.
Okok, i see :-).
> Increasing the capacitors make things *worse*, not better! Empty capacitors
> are like short circuits. You have to limit the current flowing into empty
> capacitors by applying a resistor or (better) a choke coil to the supply
> line
Am Montag, 4. Juni 2007 15:42 schrieb Vortex:
>
> > The OP tried that already, and it worked. Therefore my advice.
>
> OP? Does that mean it's a known issue?
>
OP: original posting/poster.
> But i can't imagine that this
> usb-port which is capable of 500mA should have a problem with a few
> mA.
> I think "OP" is you. Since this is your circuit, it would be hard to have
> prior
> reports.
Oh, i see. Thought you are talking about somebody else :-).
> OWFS certainly doesn't know or care about hubs -- it just uses libusb to
> enumerate USB devices and libusb for all communication.
Yes tha
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of
Vortex
Sent: Monday, June 04, 2007 9:43 AM
To: owfs-developers@lists.sourceforge.net
Subject: Re: [Owfs-developers] Usb problem with DS2490
OP? Does that mean it's a known issue? But i can't imagine that this
usb-port which is
On Mon, 4 Jun 2007 15:27:13 +0200
Jan Kandziora <[EMAIL PROTECTED]> wrote:
> Am Montag, 4. Juni 2007 14:29 schrieb Sven Geggus:
> > Jan Kandziora <[EMAIL PROTECTED]> wrote:
> > > Your interface may drain too much power on power-on from your notebook's
> > > USB port. Try inserting choke coils into
On Mon, 4 Jun 2007 12:29:07 + (UTC)
Sven Geggus <[EMAIL PROTECTED]> wrote:
> Jan Kandziora <[EMAIL PROTECTED]> wrote:
>
> > Your interface may drain too much power on power-on from your notebook's
> > USB port. Try inserting choke coils into the +5V and GND lines (a few µH).
>
> He might als
Am Montag, 4. Juni 2007 14:29 schrieb Sven Geggus:
> Jan Kandziora <[EMAIL PROTECTED]> wrote:
> > Your interface may drain too much power on power-on from your notebook's
> > USB port. Try inserting choke coils into the +5V and GND lines (a few
> > µH).
>
> He might also be able to work around this
Jan Kandziora <[EMAIL PROTECTED]> wrote:
> Your interface may drain too much power on power-on from your notebook's
> USB port. Try inserting choke coils into the +5V and GND lines (a few µH).
He might also be able to work around this Problem at least for testing
purposes using an active USB HUB.
Am Montag, 4. Juni 2007 11:07 schrieb Vortex:
>
> This is all very strange to me and i'm a bit helpless where to search the
> error. Hardware? Notebook? The DS2490 surrounding hardware? Kernel?
> libusb? owfs itself?
>
> Some ideas?
>
Your interface may drain too much power on power-on from your no
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