2 Replies Latest reply on Sep 18, 2018 5:59 AM by PhDi_1589426

    Start-up time until active mode

    PhDi_1589426

      Hello everyone,

       

      I have a project where it is nessesary to know the start-up time. Meant is the time between connection to a power supply and reaching the main loop in active mode.

       

      Does any body know how long this takes?

      Try to avoid the super cap.

       

      Thanks and best regards

      Philipp

        • 1. Re: Start-up time until active mode
          AchimE_41

          Hi Philipp,

           

          I did measurement from Reset to main (not loop!) some time ago and measured 2.12ms for M0+ and an additional 0.36ms for the M4.

          Keep in mind that the startup also configures the clocks and waits for them to settle, as well as initializes the RAM, so there might be some variation in your project. I was using the WCO and IMO with FLL at 50MHz.

           

          For reaching the main loop you have to consider your peripheral init, every peripheral initialization will add time (some more, some less), so this is a highly project specific value.

           

          May I ask what application this is meant for?

          • 2. Re: Start-up time until active mode
            PhDi_1589426

            Hi Aceh,

             

            thank you very much for the reply and sorry for the delay.

            It is a locker application.

             

            regards

            Philipp