ATXMEGA32D4-CU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATXMEGA32D4-CU

8/16-bit Atmel XMEGA D4 Microcontroller

Atmel Corporation 

XMEGA D4

26. AC – Analog Comparator

26.1 Features

26.2 Overview

• Two Analog Comparators

• Selectable hysteresis

– No

– Small

– Large

• Analog comparator output available on pin

• Flexible input selection

– All pins on the port

– Bandgap reference voltage

– A 64-level programmable voltage scaler of the internal VCC voltage

• Interrupt and event generation on:

– Rising edge

– Falling edge

– Toggle

• Window function interrupt and event generation on:

– Signal above window

– Signal inside window

– Signal below window

• Constant current source with configurable output pin selection

The analog comparator (AC) compares the voltage levels on two inputs and gives a digital out-

put based on this comparison. The analog comparator may be configured to generate interrupt

requests and/or events upon several different combinations of input change.

The analog comparator hysteresis can be adjusted in order to achieve the optimal operation for

each application.

The input selection includes analog port pins, several internal signals, and a 64-level program-

mable voltage scaler. The analog comparator output state can also be output on a pin for use by

external devices.

A constant current source can be enabled and output on a selectable pin. This can be used to

replace, for example, external 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 analog 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.

48

8135L–AVR–06/12

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