2024-10-18 01:40 AM - last edited on 2024-10-18 02:50 AM by SofLit
Wanted to confirm if the input/output voltage is 3.3V or 5V depending on the I/O structure of my pin .
I scoped a PWM signal with the board connected to the PC and on the dedicated pin I see the signal in mV. I would like to send a higher voltage through that pin by connecting an external power supply then scope it , but I believe is not possible due to its tolerance and perhaps the fact that I can't power the board anything more than 5V if i'm not wrong . I am a bit of confused on why on the scope I get the signal in mV when powered via USB.
Solved! Go to Solution.
2024-10-18 02:49 AM - edited 2024-10-18 03:16 AM
Hello @Marrkinho ,
@Marrkinho wrote:
Wanted to confirm if the input/output voltage is 3.3V or 5V depending on the I/O structure of my pin .
Most of the IO pins are Five volt tolerant (FT pins) as input but the voltage level could not exceed VDD as output (max 3.6 V).
Example:
For 5V output and according to your application, you need a voltage level shifter example: https://www.digikey.com/en/blog/logic-level-shifting-basics
2024-10-18 01:45 AM
Chip is not running at 5V
The pins can only sink/source relatively low amounts of current, you'll need a buffer for relays and motors, for example.
Check output voltage on pin without LOAD
2024-10-18 02:49 AM - edited 2024-10-18 03:16 AM
Hello @Marrkinho ,
@Marrkinho wrote:
Wanted to confirm if the input/output voltage is 3.3V or 5V depending on the I/O structure of my pin .
Most of the IO pins are Five volt tolerant (FT pins) as input but the voltage level could not exceed VDD as output (max 3.6 V).
Example:
For 5V output and according to your application, you need a voltage level shifter example: https://www.digikey.com/en/blog/logic-level-shifting-basics