PWM MAX MR (Modulation Ratio)?
Ethan Zeman 3 years ago • updated by Gustav Widén (System support) 3 years ago • 2
The valid range for the PWM Max MR is 100. Does this mean the PWM be 100% on and 0% off (essentially a digital out)? or is this a percentage value applied to the actual max (i.e. MAX MR = 100 is equivalent to a PWM wave form that is 95% on 5% off)?
Customer support service by UserEcho
The PWM out has a maximum pulse width that differs between the different modules.
So even with the PMW out set to 100, you still have a PWM.
I assume the question is about MC4x / XC4x modules?
You find the max pulse width in the Appendix A info:
If your PWM frequency is 100 Hz, the MC4x will give 99% pulse with
Period time = 1/100 = 10 ms
Max pulse with = 1/100 -100 μs = 10 ms - 100 μs = 9.9 ms
Max MR% = 9.9 ms /10 ms = 99%