PWM driver accuracy

RE: PWM driver accuracy

Gustavo Corrente — Sun, 13 May 2018 10:57:36 GMT

Hello,

So for the 15bits resolution what is the max pwm frequency?

And for 8bits?

Regards,

Gustavo

RE: PWM driver accuracy

ovrebekk — Fri, 27 Apr 2018 12:51:28 GMT

You welcome 🙂

RE: PWM driver accuracy

MaximeMylle — Wed, 25 Apr 2018 14:40:36 GMT

It is indeed to control some leds, thanks for the detailed answer!

RE: PWM driver accuracy

ovrebekk — Wed, 25 Apr 2018 14:17:45 GMT

Hi Maxime

The PWM duty cycle is configured by a 16-bit register, where 15-bits are used for the value and the last bit is used to set the polarity.

This limits the top value of the PWM module to 32767 (or 2^15 - 1)

Keep in mind that increasing the top value of the PWM will reduce the PWM frequency, which can be a problem depending on what you are planning to use it for.

If you are using it to control LED's you might get away with a PWM frequency as low as 60Hz, but if you are controlling something else (like a motor) you might want to have a significantly higher PWM frequency.

Best regards
Torbjørn