ATmega325P datasheet(308/364 Pages) ATMEL

308 / 364 page

308

8023F–AVR–07/09

ATmega325P/3250P

26.5

System and Reset Characterizations

26.6

Standard Power-on Reset

This implementation of power-on reset existed in early versions of ATmega325P/3250P. The

table below describes the characteristics of this power-on reset and it is valid for the following

devices, only:

• ATmega325P revision B and older

• ATmega3250P revision B and older

Note:

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

26.7

Enhanced Power-on Reset

This implementation of power-on reset exists in newer versions of ATmega325P/3250P. The

table below describes the characteristics of this power-on reset and it is valid for the following

devices only:

• ATmega325P revision C and newer

• ATmega3250P revision C and newer

Table 26-3.

Reset, Brown-out, and Internal Voltage Reference Characteristics

Symbol

Parameter

Condition

Min

Typ

Max

Units

VRST

RESET Pin Threshold Voltage

VCC = 3V

0.2 VCC

0.85 VCC

tRST

Minimum pulse width on RESET Pin

CC = 3V

800

VHYST

Brown-out Detector Hysteresis

tBOD

Min Pulse Width on Brown-out Reset

µs

VBG

Bandgap reference voltage

CC = 2.7V,

TA = 25°C

1.0

1.1

1.2

tBG

Bandgap reference start-up time

VCC = 2.7V,

A = 25°C

µs

IBG

Bandgap reference current consumption

VCC = 2.7V,

TA = 25°C

µA

Table 26-4.

Reset, Brown-out, and Internal Voltage Reference Characteristics,

TA = -40°C to 85°C

Symbol

Parameter

Min

Typ

Max

Units

VPOT

Power-on Reset Threshold Voltage (rising)

0.7

1.0

1.4

Power-on Reset Threshold Voltage (falling)(1)

0.05

0.9

1.3

SRON

Power-on Slope Rate

0.01

4.5

V/ms

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