Atmel ATmega328 User Manual

324
8271D–AVR–05/11
ATmega48A/PA/88A/PA/168A/PA/328/P
29.5 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 V
POT
(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 V
CC
= V
BOT
during the production test. This guarantees that a Brown-Out Reset will occur before V
CC
drops to
a voltage where correct operation of the microcontroller is no longer guaranteed. The test is performed using
BODLEVEL = 110, 101 and 100.
2. V
BOT
tested at 25°C and 85°C in production
Table 29-12. Reset, Brown-out and Internal Voltage Characteristics
(1)
Symbol Parameter Min. Typ Max Units
V
POT
Power-on Reset Threshold Voltage (rising) 1.1 1.4 1.6 V
Power-on Reset Threshold Voltage (falling)
(2)
0.6 1.3 1.6 V
SR
ON
Power-on Slope Rate 0.01 10 V/ms
V
RST
RESET Pin Threshold Voltage 0.2 V
CC
0.9 V
CC
V
t
RST
Minimum pulse width on RESET Pin 2.5 µs
V
HYST
Brown-out Detector Hysteresis 50 mV
t
BOD
Min. Pulse Width on Brown-out Reset 2 µs
V
BG
Bandgap reference voltage
V
CC
=2.7
T
A
=25°C
1.0 1.1 1.2 V
t
BG
Bandgap reference start-up time
V
CC
=2.7
T
A
=25°C
40 70 µs
I
BG
Bandgap reference current consumption
V
CC
=2.7
T
A
=25°C
10 µA
Table 29-13. BODLEVEL Fuse Coding
(1)
(2)
BODLEVEL 2:0 Fuses Min. V
BOT
Typ V
BOT
Max V
BOT
Units
111 BOD Disabled
110 1.7 1.8 2.0
V101 2.5 2.7 2.9
100 4.1 4.3 4.5
011
Reserved
010
001
000

Atmel ATmega328 Specifications

General

Brand	Atmel
Model	ATmega328
Category	Microcontrollers
Language	English