5 Replies Latest reply on Sep 8, 2015 3:33 AM by user_14586677

    Monitoring Data Coming Into DMA in Real Time

    ben.s.

      I have a shunt monitor using an A7840 isolating amplifier to monitor the current of a DC load.

         

      I want the Sigma Delta data converter to double as a device that records current and acts as a circuit breaker.

         

      Currently, I have the Sigma Delta putting the current (amps) samples into memory using the DMA. When the numbers exceed a certain value, I want an interrupt to fire triggering a GPIO flag that will light an LED. The interrupt will also remove current from the load.

         

      What is the best way to code this? I could use a comparator but I am using the A7840 which has a small offset that I am using code to calibrate out. Also, its output is differential. For optimum accuracy, I think code is the best way, unless someone has another idea.