Just a quick thought...
How about adding another small chip ... specifically a serial-in, paralle=
l-out=20
shift register.  Send serial data out from 2 pins and let the shift reg=20
perform the DAC function.

Cheers,
-Neil.


On Wednesday 07 May 2003 17:04, Dave VanHorn scribbled:
> At 11:58 PM 5/7/2003 +0200, Stef wrote:
> >hi All,
> >
> >I wondered if it was possible to create a DAC with just 1 ADC pin.
> >The reason is that I have just a few pins and pwm is too slow.
>
> With only one pin, AFAIK PWM is the only choice you have.

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