On 6/25/2012 7:46 AM, alan smith wrote:
> I have a 15.5KHz PWM being provided to me, where of course the duty cycle=
 will adjust the "dc" value ranging over the 3.3V output of the device.  So=
 what is the optimum values for the RC filter....calculate at a 50% duty cy=
cle, or does it even matter?  Just use 64.5uSec (roughly) and find some val=
ues to fit that ?
>
>
This being the PIC list and all... why don't you just use a PIC timer to=20
measure the incoming pulsewidth?  Non-PIC solutions might include the=20
using the pulse to gate a clock signal into a counter which will count=20
up.  Or an integrator to ramp up to the equivalent analog value. Any of=20
these is probably preferable to filtering the pulse.  But that depends=20
on what you are really doing.  There is no optimal solution until all=20
necessary constraints are discussed.

--=20
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