4 Replies Latest reply on Oct 4, 2018 8:15 AM by user_306160653

    PWM  / Glitch Filter

    user_306160653

      Hello, I have attached a project where I am interfacing with an SI 7023 https://www.silabs.com/documents/public/data-sheets/Si7023-A20.pdf humidity/temperature sensor and capturing the PWM signal.

       

      I have encountered two issues that I am seeking assistance with. I am using the CY8CKIT-059 prototyping kit.

       

      Without the glitch filter, I am seeing what appears to be a behavior such as capturing on an incorrect rising/falling edge. I do not experience this problem when using an on-board PWM. I have viewed the signal both through an oscilloscope, Saleae Logic 16 Pro (Analog and Digital) and do not see evidence of any glitches after manual review. I notice this happens consistently with any external PWM source.

       

      Normally in the project, my input comes from a digital input, but have disabled that for the example and used a PWM instead.

       

      Any assistance is greatly appreciated.

       

      Thanks,

      Karl