Hi list.

I have an application where I need to generate a relatively large number of
(slow) PWM signals. I'm not sure how many at the moment, but we could assume
this number would far exceed the number of available IO on a PIC. Actually,
the fact that it is PWM is probably not relevant. Let's just say that I need
to expand the IO of my PIC. I don't need bi-directional IO. All I want to do
is generate a large number of PWM signals, which will be low-pass filtered
to get some crude analogue control voltages.

The most obvious solution to me at the moment is through the use of a number
of octal / hex latch ICs, such as the 40174. On the other end of the scale,
I could use a Xilinx CPLD if I wanted to go mad (and needed the speed, which
I don't).

Can anyone suggest their own favourite solution for expanding IO on a PIC,
to get a large number of digital outputs? Any particular device I should
consider looking at?

Thanks in advance,

Trevor.

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