Is it possible to generate PWM signal 1V full range (4096) step using PCA9685 or full range voltage PWM in this module is always equal VCC (3.3V in my project)?
PWM peak voltage of a digital output is about the same as VCC of the chip.
A voltage divider could lower 3.3volt PWM to 1volt PWM, but only if the load impedance stays constant.
What is your project, and why 1volt PWM.
Leo..