Hi Tuan,
I went through the below TIe2e thread as it is matching my query.
As it is mentioned that by using 249K Ohm the external PWM voltage threshold will be set to 2.49V.
In our case the uC have the minimum High-level output voltage VOH(low) of 2.4V for the PWM controlling GPIO which is lower than 2.49V PWM threshold level. I suspect there will be chances of missing the PWM dimming events due to this mismatch.
I want to know the relationship b/w Rramp and the EXT. PWM voltage threshold and the method to calculate exact resistor value to decrease this threshold as per our requirement. Also please specify what will be the impact of Iramp tolerance over the HI and LO level of the input ?
