5V input to STM32 ADC ?

antonius · ‎2019-08-11

Dear Member,

I have a sensor with 5V output,

Does STM32 work with it ?

Thanks

oleksandr.karbivsky · ‎2019-08-12

Hi. STM32 ADC does not work with 5V. Maximal voltage for ADC you can find in datasheet (Vref or Vdda depends of uC). In most cases it is 3.6 V.

antonius · ‎2019-08-12

How can I use this sensor

with STM32 ?

thanks

S.Ma · ‎2019-08-12

Remember that most resistor type sensor are heated alloy base which typically need 100mA. Cheap and high power...

oleksandr.karbivsky · ‎2019-08-12

You can use resistor voltage divider.

antonius · ‎2019-08-12

put voltage divider 5V to 3.3V on analog output to STM32 ADC input ? good idea, what value do you suggest ? 10K and 20K ? 2/3*5V=3.3V

thanks