ATmega328P datasheet(318/448 Pages) ATMEL

318 / 448 page

318

8161D–AVR–10/09

ATmega48PA/88PA/168PA/328P

28.5

System and Reset Characteristics

Notes:

1. Values are guidelines only.

2. The Power-on Reset will not work unless the supply voltage has been below VPOT (falling)

Notes:

1. V

BOT may be below nominal minimum operating voltage for some devices. For devices where this is the case, the device is

tested down to VCC = 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, 101 and 100.

Table 28-3.

Reset, Brown-out and Internal Voltage Characteristics(1)

Symbol

Parameter

Min

Typ

Max

Units

VPOT

Power-on Reset Threshold Voltage (rising)

1.1

1.4

1.6

Power-on Reset Threshold Voltage (falling)(2)

0.6

1.3

1.6

SRON

Power-on Slope Rate

0.01

V/ms

VRST

RESET Pin Threshold Voltage

0.2 VCC

0.9 VCC

tRST

Minimum pulse width on RESET Pin

2.5

µs

HYST

Brown-out Detector Hysteresis

tBOD

Min Pulse Width on Brown-out Reset

µs

VBG

Bandgap reference voltage

VCC=2.7

A=25°C

1.0

1.1

1.2

tBG

Bandgap reference start-up time

VCC=2.7

TA=25°C

µs

IBG

Bandgap reference current consumption

CC=2.7

TA=25°C

µA

Table 28-4.

BODLEVEL Fuse Coding(1)

BODLEVEL 2:0 Fuses

Min V

BOT

Typ V

BOT

Max V

BOT

Units

111

BOD Disabled

110

1.7

1.8

2.0

101

2.5

2.7

2.9

100

4.1

4.3

4.5

011

Reserved

010

001

000

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