'PIC controlling PWM'
Norayr S. Elmayan
I have been testing the PWM module inside the pic & the period accuracy is
not more than 8 bits (PR2). For the range I am working in 1500 HZ to 3500
hz, each step increment for the frequency generated by the PIC is 35 to 50
HZ on the high side. Crystal=4 Mhz
When you plug the numbers in excel worksheet we notice that period starts
pretty linear & then sharply increases & becomes non linear. My
application is being very critical on frequencies close to 3 khz range &
sudden jumps is not acceptable. (A/D controls the period while duty cycle
What is your experience? Suggestion, can we get a hold of a digitally
controlled (10 bit period) PWM resolution IC, who has it & what is the
internet address for me to check out the datasheets. I think I will get
use a 10 bit resolution PIC A/D & interface to such 10 bit PWM IC.
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