ATmega32U2 datasheet(223/314 Pages) ATMEL

Part #	ATmega32U2

Description	8-bit Microcontroller with 8/16/32K Bytes of ISP Flash and USB Controller

PDF	314 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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223 / 314 page

223

7799B–AVR–07/09

ATmega8U2/16U2/32U2

22. Analog Comparator

22.1

Overview

The Analog Comparator compares the input values on the positive pin AIN0 and negative pin

AIN1. When the voltage on the positive pin AIN0 is higher than the voltage on the negative pin

AIN1, the Analog Comparator output, ACO, is set. The comparator’s output can be set to trigger

the Timer/Counter1 Input Capture function. In addition, the comparator can trigger a separate

interrupt, exclusive to the Analog Comparator. The user can select Interrupt triggering on com-

parator output rise, fall or toggle. A block diagram of the comparator and its surrounding logic is

shown in Figure 22-1. User can also replace by software the AIN0 input by the internal Bandgap

reference.

Figure 22-1. Analog Comparator Block Diagram

(1)

Notes:

1. Refer to Figure 1-1 on page 2 and Table 12-9 on page 79 for Analog Comparator pin

placement.

ACBG

BANDGAP

REFERENCE

AIN2

AIN3

AIN4

AIN5

AIN6

AIN0

ACMUX

ATmega32U2 Datasheet(PDF) 223 Page - ATMEL Corporation