Slide 1 Slide 2 Slide 3 Slide 4 Slide 5 Slide 6 Slide 7 Slide 8 Slide 9 Slide 10 Slide 11 Slide 12 Slide 13 Slide 14 Slide 15 Slide 16 Product List
Topic 5 The Analog Subsystem Slide 15

As shown on this slide, developers can take a look at the comparator outputs. As it is on Piccolo, comparator outputs 1, 2, and 3 can trip the PWM. So users can apply the on-board comparators to set the threshold to trip the PWMs whether it is cycle by cycle or one-shot tripping modes. One exception to ADC1, ADC2 being identical is that comparators 4, 5, and 6 cannot be used to trip the PWMs. The reason is that the ePWM was not redesigned to be able to accept 4, 5, and 6. All six of the comparator outputs go to GPIO pins, and all six comparators can compare against the DAC value, with comparators 2 and 5 being unique because they can compare two analog signals. Those two compare values are being used with the new comparator output signal on Concerto. Comparator 2 can go into the NOR gates, comparator 5 goes into the NOR gates, and based on the logic table shown on this slide, when Comparator 5 output is low and Comparator 2 output is high, the CAC output will be low. Conversely, if Comparator 5 output is high, comparator 2 output is low, then the CAC output is high. This is a new signal that is available, in addition to the six comparator outputs going to GPIO pins, the CAC output is going to GPIO output also.

PTM Published on: 2012-02-23