ATXMEGA8E5 datasheet(61/153 Pages) MICROCHIP

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DS40002059A-page 61

ATxmega32E5/16E5/8E5

30. AC – Analog Comparator

30.1 Features



Two Analog Comparators



Selectable propagation delay



Selectable hysteresis



Small



Large



Analog Comparator output available on pin



Flexible Input Selection



All pins on the port



Output from the DAC



Bandgap reference voltage



A 64-level programmable voltage scaler of the internal AVCC voltage



Interrupt and event generation on

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Rising edge

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Falling edge

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Toggle



Window function interrupt and event generation on

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Signal above window

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Signal inside window

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Signal below window

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Constant current source with configurable output pin selection



Source of asynchronous event

30.2 Overview

The Analog Comparator (AC) compares the voltage level on two inputs and gives a digital output based on this compari-

son. The Analog Comparator may be configured to give interrupt requests and/or synchronous/asynchronous events upon

several different combinations of input change.

One important property of the Analog Comparator when it comes to the dynamic behavior, is the hysteresis. This parame-

ter may be adjusted in order to find the optimal operation for each application.

The input section includes analog port pins, several internal signals and a 64-level programmable voltage scaler. The ana-

log comparator output state can also be directly available on a pin for use by external devices. Using as pair they can also

be set in Window mode to monitor a signal compared to a voltage window instead of a voltage level.

A constant current source can be enabled and output on a selectable pin. This can be used to replace, for example, exter-

nal resistors used to charge capacitors in capacitive touch sensing applications.

The analog comparators are always grouped in pairs on each port. These are called analog comparator 0 (AC0) and ana-

log comparator 1 (AC1). They have identical behavior, but separate control registers. Used as pair, they can be set in

window mode to compare a signal to a voltage range instead of a voltage level.

PORTA has one AC pair. Notation is ACA.

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