LM3S6965 Microcontroller

17 Analog Comparators

An analog comparator is a peripheral that compares two analog voltages, and provides a logical output that signals the comparison result.

Note: Not all comparators have the option to drive an output pin.

The comparator can provide its output to a device pin, acting as a replacement for an analog comparator on the board, or it can be used to signal the application via interrupts or triggers to the ADC to cause it to start capturing a sample sequence. The interrupt generation and ADC triggering logic is separate. This means, for example, that an interrupt can be generated on a rising edge and the ADC triggered on a falling edge.

The Stellaris® Analog Comparators module has the following features:

■Two independent integrated analog comparators

■Configurable for output to drive an output pin, generate an interrupt, or initiate an ADC sample sequence

■Compare external pin input to external pin input or to internal programmable voltage reference

■Compare a test voltage against any one of these voltages

–An individual external reference voltage

–A shared single external reference voltage

–A shared internal reference voltage

Preliminary