Em 6/6/2012 20:41, Marcel Duchamp escreveu:
> Looking for a 1-to-8 mux that will run from a 3.3V PIC32.  It will be=20
> driving servo signals. It looks like a '595 is just out of range to=20
> reliably work.
>
>
> Any suggestions?


You are in the right path. You can use a 74HCT or 74AHCT device powered
by 5V. Its inputs will understand the 3.3V CMOS outputs
Fill a shift-register with zeros then walk a single '1' across all the
outputs, waiting the necessary pulse width for each output. Repeat every
20ms.
It takes just 2 I/Os, clock and data. The chain can have up to 10
outputs and yet ensure correct timing for all the servos (2ms x 10 =3D 20ms=
).

Isaac

--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.