Searching \ for '[EE]: anyone used a Holtek HT9200?' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/index.htm?key=anyone+used+holtek
Search entire site for: 'anyone used a Holtek HT9200?'.

Exact match. Not showing close matches.
PICList Thread
'[EE]: anyone used a Holtek HT9200?'
2005\12\19@224446 by alan smith

picon face
Ive got a PIC driving a HT9200 DTMF generator, and I have it generating tones OK, but I don't see anything in the data sheet about controlling the duration of the tones itself?
 ie....how long the tone is actually active on the output before generating the next one.

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around
http://mail.yahoo.com

2005\12\19@230741 by David Van Horn

picon face


> Ive got a PIC driving a HT9200 DTMF generator, and I have it
> generating tones OK, but I don't see anything in the data
> sheet about controlling the duration of the tones itself?
>   ie....how long the tone is actually active on the output
> before generating the next one.


ME :)

IIRC there's an enable pin or some such.
I did some interface code for it
http://www.dvanhorn.org/Downloads/HT9200.ASM

It's AVRish, but you shouldn't have any trouble reading it.


2005\12\20@072844 by Mark Jordan

flavicon
face
On 19 Dec 2005 at 23:17, David Van Horn wrote:

>  
>
> > Ive got a PIC driving a HT9200 DTMF generator, and I have it
> > generating tones OK, but I don't see anything in the data
> > sheet about controlling the duration of the tones itself?
> >   ie....how long the tone is actually active on the output
> > before generating the next one.
>
>
> ME :)
>
> IIRC there's an enable pin or some such.
> I did some interface code for it
> http://www.dvanhorn.org/Downloads/HT9200.ASM
>
> It's AVRish, but you shouldn't have any trouble reading it.
>

       Have you observed a very annoying DC glitch at the HT9200 audio output
when enabling/disabling the tones?

       Mark Jordan


2005\12\20@091132 by David Van Horn

picon face


>        Have you observed a very annoying DC glitch at the
> HT9200 audio output when enabling/disabling the tones?
>
>        Mark Jordan


Yes. They just turn on the output.  AC couple into a node that's biased
to half vcc, and that should minimize the problem. I think it would be
nice if they would start on the zero crossings, but since it's DTMF I'm
not sure they can really do that.


2005\12\20@094032 by alan smith
picon face
Thanks Dave...I'll have a look and see how it compares with mine.


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around
http://mail.yahoo.com

2005\12\20@100421 by David Van Horn

picon face


> Thanks Dave...I'll have a look and see how it compares with mine.

Is the speedup algorithm of any use to you?


2005\12\20@104416 by alan smith

picon face
I'm not sure yet....but probably not, if anything I will want to run it slower, for audible feedback to the user that the tones are going out.  The "fuzzy feeling" they get knowing they pressed a button and something happened.  Consumers....you know?

David Van Horn <spam_OUTdvanhornTakeThisOuTspammicrobrix.com> wrote:  

> Thanks Dave...I'll have a look and see how it compares with mine.

Is the speedup algorithm of any use to you?


More... (looser matching)
- Last day of these posts
- In 2005 , 2006 only
- Today
- New search...