STM32G0 Minimum EXTI Pulse Width

[gdbeatl]

Hi Folks,

I'm working with an STM32G0B1MCT6. In my application I need to be able to react to pulses with a width of about 5 ns. It seems the only way I could pull this off is with the rising edge detection in the EXTI controller, or some additional external hardware.

Datasheets for other products include a tEXTIpw parameter. I don't see a spec in either the reference manual or datasheet for the G0 series though.

Help me ST - please can I have an official spec for this parameter on this series. Alternatively, do you have any recommendations for detecting short pulses without the EXTI peripheral?

Cheers!

[mƎALLEm]

Hello @gdbeatl and welcome to the ST community,

I will ask internally if we have the value of that parameter.

[mƎALLEm · Accepted solution]

Hello,

According to an internal feedback: tEXTIpw is around 10ns.

[RobK1]

A sufficiently fast D-latch (74AUP series for example), wired as a T-flipflop, would extend the time available for detection tremendously. You can use this in combination with EXTI, if you enable both rising- and falling edges.

[AScha.3]

Hi,

just put a simple gate at the pin, making any positive pulse longer (1 us or so):

...and problem solved.