If 3 hardware pwm output needed and we have to choose between a 16F737 ( 3 ccp pwm ) and a 18F2431 ( 6 channel/ 3 pair power control pwm )
Which one is better ? Why ?
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If 3 hardware pwm output needed and we have to choose between a 16F737 ( 3 ccp pwm ) and a 18F2431 ( 6 channel/ 3 pair power control pwm )
Which one is better ? Why ?
The 18F2431 has a specialiced PWM-modul for motor-control. 3 PWMs can control 6 Output-Pins for high- and low-side.
The PWM can produce normal PWMs or center-justified-PWMs. The frequency of the device can be very high to produce fine PWMs...
The 18F2431 has very fast ADC !
The 18F-devices have a better RAM-organisation.
The POWER CONTROL PWM MODULE can have ... "Up to 14-bit resolution, depending upon the PWM period."Quote:
Originally Posted by luminas
That makes it "better" to me.
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What are your requirements for the PWM signal?
Will it be used for motor control or something else?
Thanks guys :)
I am experimenting with both PICs , both system run well as expected
Beside those hardware specific features, is the CPU utilization lower with power control pwm compared to ccp pwm ?
Is there something like " windows task manager " for PIC to see the CPU load ?
Bruce:
It is a motor control with 20 kHz pwm freq.
PWM is hardware based so once it's configured & enabled it doesn't require CPU overhead
to continue. Only when you make changes to duty-cycle or frequency.
For motor control I would definitely prefer the 18F2431 with additional built-in safety
options like fault inputs and dead-band. The 16F737 only has standard CCPx type PWM
outputs. The 2431 would be a lot better choice in my opinion.
Thanks Bruce, I will go with 2431. Have a nice day !