Rockbox.org home
release
dev builds
extras
themes manual
wiki
device status forums
mailing lists
IRC bugs
patches
dev guide



Rockbox mail archive

Subject: Re: BMW IBUS <-> Archos Jukebox (as CD Changer)

Re: BMW IBUS <-> Archos Jukebox (as CD Changer)

From: [IDC]Dragon <idc-dragon_at_gmx.de>
Date: Mon, 15 Mar 2004 12:55:17 +0100 (MET)

> >>>Another explaination could be that the pullup is very strong, so the
> Archos
> >>>fails to pull it low. How much current do you measure when you short
> source
> >>>to ground (or bus to ground)? The SH is specified to sink max. 10 mA.
>
> I think this is the problem. When I tried to measure the necessary current
> to bring the bus to 0V (by shorting IBUS and GND with the multimeter) my
> multimeter displayed 0.2 in the 200mA range. However when I switched to
> the
> 20mA range it displayed 0.02. So I'm not trusting the readings.

Do you have access to a different meter?

> If my assumption is correct, what can be done to my circuit? I'm using the
> one pictured here: http://ctp.di.fct.unl.pt/~fpb/ibus-archos.jpg as it
> seems to be the one that works the best...

Why do you have 2 transistors? Can this work? My suggestion was to do it
like the left part.

Jörg

-- 
+++ NEU bei GMX und erstmalig in Deutschland: TÜV-geprüfter Virenschutz +++
100% Virenerkennung nach Wildlist. Infos: http://www.gmx.net/virenschutz
_______________________________________________
http://cool.haxx.se/mailman/listinfo/rockbox
Received on 2004-03-15

Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy