Question about ADC versus GPIO Analog

[richard239955_stm1]

Posted on April 03, 2015 at 04:23

In STM32CubeMX, when I click on a pin, the following are two of the choices amongst others are presented to me.

I want to understand what the difference is between ADC1_IN0 versus GPIO_Analog. I have looked through numerous manuals and all over the Internet and all through ST Microelectronics website and cannot find a definitive answer. What is the difference, if any, why would I use one over the other, it at all? #gpio-analog-adc #mx-gpio-analog

[ENGIN TANRIKULU]

Hi @richard239955_s tm1
Could you please explain the difference between GPIO Analog pin and ADC?

[AScha.3]

The GPIO analogue option is not to be confused with an ADC input, but in principle has two functions:

• Disconnecting the external pin from the digital function. This is useful, for example, to disconnect the Schmitt trigger present at the digital input from a floating input, because this can lead to high-frequency switching of this trigger with associated current consumption.
• Connecting any analogue peripherals (e.g. opamp, comparator, ADC) that may be present, but do not necessarily have to be in the respective case.

from

https://community.st.com/t5/stm32-mcus-products/use-gpio-analog-for-adc-read-value-on-stm32h735/td-p/75324