Datasheet

334
ATmega169A/PA/329A/PA/649A/P/3290A/PA/6490A/P [DATASHEET]
8284E–AVR–02/2013
29.5 System and reset characteristics
Note: 1. The Power-on Reset will not work unless the supply voltage has been below V
POT
(falling).
29.6 Brown-out Detection
Note: 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.
29.7 External Interrupts Characteristics
Table 29-14. Reset, Brown-out, and Internal Voltage characteristics.
Symbol Parameter Condition Min. Typ. Max. Units
V
POT
Power-on Reset Threshold Voltage (rising) T
A
= -40°C to 85°C 1.1 1.4 1.6
V
Power-on Reset Threshold Voltage (falling)
(1)
T
A
= -40°C to 85°C 0.6 1.3 1.6
V
PSR
Power-on Reset Slope Rate 0.1 4.5 V/ms
V
RST
RESET Pin Threshold Voltage V
CC
= 3V 0.2 V
CC
0.9 V
CC
V
t
RST
Minimum pulse width on RESET Pin V
CC
= 3V 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
= 2.7V, T
A
= 25°C 1.0 1.1 1.2 V
t
BG
Bandgap reference start-up time V
CC
= 2.7V, T
A
= 25°C 40 70 µs
I
BG
Bandgap reference current consumption V
CC
= 2.7V, T
A
= 25°C 15 µA
Table 29-15. 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
V101 2.5 2.7 2.9
100 4.1 4.3 4.5
011
Reserved
010
001
000
Table 29-16. Asynchronous external interrupt characteristics.
Symbol Parameter Condition Min. Typ. Max. Units
t
INT
Minimum pulse width for asynchronous external interrupt 50 ns