--- In ts-7000@yahoogroups.com, "Yan Seiner" <yan@s...> wrote:
>
> --- In ts-7000@yahoogroups.com, Jim Jackson <jj@f...> wrote:
> >
> >
> >
> >
> > On Thu, 1 Dec 2005, Yan Seiner wrote:
> >
> > > The greater issue is that I need 5V TTL logic so I need a memory map
> > > for the K7V video board with the registers laid out....
> > >
> >
> > Why? What's wrong with just a couple of resistors or zener and
resistor?
> > Jim
> >
>
> Well, because the IR sensor I need runs off of 5V; if I can get 5V TTL
> then it's just a matter of hooking it up... Otherwise, I will need
> more components to provide 5V. I'm thinking one pin to power it, one
> pin to sense it. Simple....
>
> OTOH, if one of the hardware folks has any suggestions for connecting
> a Vishay TSOP 1738 or similar to the 3.3V GPIO on the tx7xx0 boards
> I'd love to hear them....
>
> --Yan
>


Yan,

It looks like the Vishay part is a remote control receiver/
demodulator. All you need to do to "condition" the signal is to use a
resistive divider. The part can handle an output current up to 5ma. So
if power consumption is not an issue, use a 1.8k and a 3.3k resistor
(1ma). Keep it simple. If power consumption is an issue, scale the
resistors up (18k/33k, 180k/330k, etc) Keep the ratio constant. The
resistive divider will limit the output voltage range into an area the
micro can handle.
----------------OUT
1.8k | 3.3k
IN>---/\/\/\/\/--o--/\/\/\/\/----GND

NJOY,
Jamey