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C2802x/C2803x/C2806x/F28M3x COMP

Compare two input voltages on comparator pins

Description

Configure the comparator module to output the comparison result on the comparator pins of the processor.

  • C2802x/C2803x/C2806x/F28M3x COMP block

Parameters

Comparator module

Select the comparator module to configure. Use only one block per module.

Second input

Select COMPxB to compare the voltage of Input Pin A with Input Pin B

Select Internal DAC to compare the voltage of Input Pin A with the output of a DAC reference located in the comparator. For more information, see the “DAC Reference” section of the TMS320x2802x, 2803x Piccolo Analog-to-Digital Converter (ADC) and Comparator.

The comparator source outputs 1, if Input Pin A has a value greater than Input Pin B or the 10-bit DAC reference. Otherwise, it outputs 0.

Invert comparator output

Select this check box to apply a logical NOT to the output of the comparator source. For example, when the comparator source outputs 1, the circuit inverts it to 0.

Synchronization

Select Asynchronous to pass the asynchronous version of the comparator output. Select Synchronous to pass the synchronous version of the comparator output. Selecting Synchronous enables the Qualification period option.

Qualification period

Qualify changes in the comparator output before passing them along. The Passed through setting passes changes in the comparator value along without qualifying them. The consecutive clocks settings pass changes in the comparator value along after receiving the specified number of consecutive samples with the same value. Use this setting to prevent intermittent and spurious changes in the comparator output.

Sample time

Specify the time interval between samples. To inherit sample time from the upstream block, set this parameter to -1.

References

TMS320x2802x, 2803x Piccolo Analog-to-Digital Converter (ADC) and Comparator, Literature Number: SPRUGE5, from the Texas Instruments® Web site.