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4 pwm output suggestions - dsPIC33

 
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fvnktion



Joined: 27 Jun 2006
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4 pwm output suggestions - dsPIC33
PostPosted: Fri Jul 17, 2009 4:01 pm     Reply with quote
I am getting ready for a project that will require 4 pwm outputs. I have up to this point been using the PIC18 series MCU's.

I don't see any option for PWM outputs up to 4 in the pic18's, but do see that it is available with a device such as: dsPIC33FJ128MC202 (QFN) package.


I am wondering what exactly I am getting into with goint to this new device. To begin with it seems a few downfalls would be: It appears that if i go this this PIC33 pic i will have to complete redesigns, (due to different pinouts), if i wish to use it anywhere i would have been using the PIC18.

I am also wondering about learning curve in getting things to work code wise - how transparent is the coding between code that i already have written for the PIC18.

Can anyone recommend a good book that may be directed towards these dsPIC beasts. Any thoughts, opinons and suggestion would be greatly appreciated.
PCM programmer



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PostPosted: Fri Jul 17, 2009 4:28 pm     Reply with quote
Quote:
I don't see any option for PWM outputs up to 4 in the pic18's

18F4431 and related PICs have 6 channels. Sample code:
http://www.ccsinfo.com/forum/viewtopic.php?t=37206
Two channels are ordinary PWM. Four channels are power PWM, but
they can emulate ordinary PWM, as shown in the link above.

You can use this page to find more 18F PICs:
http://www.microchip.com/maps/microcontroller.aspx
Set the Prefix for "PIC18F". The two columns are called "From" and
"Thru", buts it's really "Min" and "Max".

Set the PWM Channels to 4, and leave the 2nd column at "All".
The results show 18F8520 and 18F6520. But when you look at
the data sheet for those PICs, it shows there are six PICs in that
series that have 5 PWM channels. So the "PIC Finder" page isn't
perfect.

Also, there's no direct way to search for "Total number of independent
PWM channels (of any type) in a PIC".

You can find PICs in the 18F4431 series by setting "PWM channels" to 2,
and "Motor Control" PWM channels to 4. Then it shows many more PICs,
including the 18F4431.
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