At 02:23 PM 7/14/97 EDT, you wrote:
>bunch (maybe a dozen) of these in it with serial control (ideally with a
>serial out so the data can be looped into more PWM controllers).  I'd
>like to be able to send a number into each of these PWM circuits and get
>a pulse whose width is proportional to the number.  Most PWM stuff I've
>seen has been single channel and pretty much an analog circuit (PWM out
>proportional to analog input).  Any digital PWM peripherals out there?

Harold,

My generic robotic controller does this, sort of.  It accepts commands via
RS-232 or 485 (or R/C PWM, depending upon software configuration).  It
outputs R/C PWM to up to 16 channels, each channel gets a 2mS slot with
data up to 2mS wide, on a rotating basis.  If you use a serial input, the
two PWMs through the 16 channels at the same time (one PWM module runs 8
channels, the other runs the other 8) for a complete refresh to each
channel every 16mS.  If you go with a R/C PWM input, the signal cycles
every 32mS.

Now if you're looking for real PWM like to generate an analog signal, I
can't help.

Andy

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Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
          Hardware & Software for Industry & R/C Hobbies
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