Multi slow speed PWM

[Darrel Taylor]

Sure, you could use the CCP modules. But you'd need to run the pic at 4mhz to get it down to a minimum frequency of 245hz. And then you would only have 2 channels. So it would take 3 PICs to get all 5 channels.

You could use 12F683's that have one CCP module each. Used along with timer1 they can produce 16-bit PWM. But it would take 5 - 12F683's to get your required 5 PWM's.

You might take a look at the PIC18F4331.

It has 4-14bit pwm's and 2 normal CCP modules. The chip is supported by PBP, but the 14-bit PWM modules are not. So you would need to manipulate the registers manualy. But at least you could get all 5 PWM's from the same chip.

DT

[Darrel Taylor]

Another good chip is the 18F6720 which has 5 CCP modules

DT

[mister_e]

Darrel.. FYI, Microchip says...Please consider using device PIC18F6722

Nice PIC so far... probably enough to fade 5 leds and 2-3 other task

[willem]

Dear Darrel, Steve,

Thanks again for your info and suggestions!
It maybe good for me to have a look at the problem from the other side; i.e.
the PWM requirements for my dimming device.
If I can make a setup accepting PWM over the full 5ms for a 0-100% light control it would be perfect to and Multi-SPWM could do the job.

I'll keep you informed.

Willem