What is the minimal voltage the DAC can output?
When I read the Datasheet for the stm32f301 I can see a min of 0.2V with buffer ON.
However when the buffer is OFF the manual says 0.5mV.
I use the DAC internally as input for the comparator. When I set the DAC to 0x0000 I can read ~50mV on the output pin.
If I plot a linear ramp I get the first beginning from 50mV up to ~150mV very slow rising and then from there to VCC with the normal and linear slope.
Why is that? Why does the DAC only give me a minimum voltage of 50mV and not 0mV? Why is the first part of the ramp with a different slope?
I tested a stm32f301 on my custom PCB and also the STM32F303 on the stm32f3 discovery.