ATMEGA1280 datasheet(60/449 Pages) ATMEL

Il numero della parte	ATMEGA1280

Spiegazioni elettronici	8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash

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ATmega640/1280/1281/2560/2561

2549K–AVR–01/07

Brown-out Detection

ATmega640/1280/1281/2560/2561 has an On-chip Brown-out Detection (BOD) circuit

for monitoring the V

CC level during operation by comparing it to a fixed trigger level. The

trigger level for the BOD can be selected by the BODLEVEL Fuses. The trigger level

has a hysteresis to ensure spike free Brown-out Detection. The hysteresis on the detec-

tion level should be interpreted as V

BOT+ = VBOT + VHYST/2 and VBOT- = VBOT - VHYST/2.

Note:

1. VBOT may be below nominal minimum operating voltage for some devices. For

devices where this is the case, the device is tested down to V

CC = VBOT during the

production test. This guarantees that a Brown-Out Reset will occur before VCC drops

to a voltage where correct operation of the microcontroller is no longer guaranteed.

The

test

is

performed

using

BODLEVEL = 110

for

4

MHz

operation

of

ATmega640V/1280V/1281V/2560V/2561V, BODLEVEL = 101 for 8 MHz operation of

ATmega640V/1280V/1281V/2560V/2561V

and

ATmega640/1280/1281,

and

BODLEVEL = 100 for 16 MHz operation of ATmega640/1280/1281/2560/2561.

When the BOD is enabled, and V

CC decreases to a value below the trigger level (VBOT-

in Figure 28), the Brown-out Reset is immediately activated. When V

CC increases above

the trigger level (V

BOT+ in Figure 28), the delay counter starts the MCU after the Time-

out period t

TOUT has expired.

The BOD circuit will only detect a drop in V

CC if the voltage stays below the trigger level

for longer than t

BOD given in Table 26.

Figure 28. Brown-out Reset During Operation

Table 27. BODLEVEL Fuse Coding

(1)

BODLEVEL 2:0 Fuses

Min VBOT

Typ VBOT

Max VBOT

Units

111

BOD Disabled

110

1.7

1.8

2.0

V

101

2.5

2.7

2.9

100

4.1

4.3

4.5

011

Reserved

010

001

000

Table 28. Brown-out Characteristics

Symbol

Parameter

Min

Typ

Max

Units

VHYST

Brown-out Detector Hysteresis

50

mV

t

BOD

Min Pulse Width on Brown-out Reset

ns

VCC

RESET

TIME-OUT

INTERNAL

RESET

VBOT-

VBOT+

tTOUT

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