2 Replies Latest reply on Jul 19, 2019 6:36 AM by user_2747286

    startup SAR_ADC soc after 10µs

    user_2747286

      Hello,

      in the description of soc-Input of SAR_ADC, there is following sentence in the datasheet:

      The first soc rising edge should be generated at least 10 us after the Component is started to guarantee reference and pump voltage stability.

       

      How is this to understand? If I'd like to sample with 200Hz, I have to proved the first edge after 10µs? (following edges are not concern?)

      Is also possible to do this first conversion via SW control to be sure to have this 10µs?

       

      Thx,

        Stefan

        • 1. Re: startup SAR_ADC soc after 10µs
          BoTa_264741

          Stefan,

          You should have no problem sampling SAR_ADC at 200Hz. What 10us means that after ADC_Start() command, it will take 10us to stabilize reading. Typically you start ADC on startup among many other initialization commands, so by the time in it sequence is complete, the ADC is ready.

          This parameter may be important only if you turn ADC only for short time to take a sample and then immediately turn it off to save power. It such case adding a delay may be proper

          ADC_Start();

          CyDelyUs(10);

          ADC_StartConvert();

          ....

          ADC_Stop();

           

          /odissey1

          1 of 1 people found this helpful
          • 2. Re: startup SAR_ADC soc after 10µs
            user_2747286

            Hello,

            thank you for explaination.

            I have misunderstood the sentence and thought SOC must come at the latest 10µs after start. So it makes more sense...

            Thx,

              Stefan