From: David Brownell <david-b@pacbell.net>
To: linux-omap-open-source@linux.omap.com
Subject: Re: touchscreen on omap5912
Date: Fri, 22 Dec 2006 10:29:40 -0800 [thread overview]
Message-ID: <200612221029.41005.david-b@pacbell.net> (raw)
In-Reply-To: <e14857210612220618g1a1ce01evcd8df9c585050630@mail.gmail.com>
> I've no idea how I can connect the touchscreen signals(they are x+, x-, y+
> and y-) to omap5912.
> Is ADS7846 needed?
> Or should I connect them directly to CPU?
If you look at schematics for a board that uses a touchscreen, you'll
notice that x+/x- and y+/y- are differential signals, so you'll need
digital-to-analog conversion. OMAP doesn't integrate such stuff.
You don't need an ads7846, but you'll need _some_ chip. TSC2101 is
another option (from TI, and there are dozens of others.
prev parent reply other threads:[~2006-12-22 18:29 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-22 14:18 touchscreen on omap5912 柏青董
2006-12-22 18:29 ` David Brownell [this message]
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