ATmega48PA/88PA/168PA/328P
28.5
System and Reset Characteristics
Reset, Brown-out and Internal Voltage Characteristics
Parameter
Power-on Reset Threshold Voltage (rising)
V
POT
SR
ON
V
RST
t
RST
V
HYST
t
BOD
V
BG
t
BG
I
BG
Notes:
Power-on Reset Threshold Voltage (falling)
Power-on Slope Rate
RESET Pin Threshold Voltage
Minimum pulse width on RESET Pin
Brown-out Detector Hysteresis
Min Pulse Width on Brown-out Reset
Bandgap reference voltage
Bandgap reference start-up time
Bandgap reference current consumption
V
CC
=2.7
T
A
=25°C
V
CC
=2.7
T
A
=25°C
V
CC
=2.7
T
A
=25°C
1.0
50
2
1.1
40
10
1.2
70
Min
1.1
0.6
0.01
0.2 V
CC
Typ
1.4
1.3
Max
1.6
1.6
10
0.9 V
CC
2.5
Units
V
V
V/ms
V
µs
mV
µs
V
µs
µA
Table 28-3.
Symbol
1. Values are guidelines only.
2. The Power-on Reset will not work unless the supply voltage has been below V
POT
(falling)
Table 28-4.
BODLEVEL Fuse Coding
BODLEVEL 2:0 Fuses
111
110
101
100
011
010
Reserved
001
000
1.7
2.5
4.1
Min V
BOT
Typ V
BOT
BOD Disabled
1.8
2.7
4.3
2.0
2.9
4.5
V
Max V
BOT
Units
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.
318
8161D–AVR–10/09
ATMEL [ ATMEL CORPORATION ]
