Datasheet

104
XMEGA A4U [DATASHEET]
Atmel-8387H-AVR-ATxmega16A4U-34A4U-64A4U-128A4U-Datasheet_09/2014
36.2.10 Brownout Detection Characteristics
Table 36-49. Brownout detection characteristics.
36.2.11 External Reset Characteristics
Table 36-50. External reset characteristics.
36.2.12 Power-on Reset Characteristics
Table 36-51. Power-on reset characteristics.
Note: 1. V
POT-
values are only valid when BOD is disabled. When BOD is enabled V
POT-
= V
POT+
.
Symbol Parameter Condition Min. Typ. Max. Units
V
BOT
BOD level 0 falling V
CC
1.60 1.62 1.72
V
BOD level 1 falling V
CC
1.8
BOD level 2 falling V
CC
2.0
BOD level 3 falling V
CC
2.2
BOD level 4 falling V
CC
2.4
BOD level 5 falling V
CC
2.6
BOD level 6 falling V
CC
2.8
BOD level 7 falling V
CC
3.0
t
BOD
Detection time
Continuous mode 0.4
µs
Sampled mode 1000
V
HYST
Hysteresis 1.2 %
Symbol Parameter Condition Min. Typ. Max. Units
t
EXT
Minimum reset pulse width 95 1000 ns
V
RST
Reset threshold voltage (V
IH
)
V
CC
= 2.7 - 3.6V 0.60*V
CC
V
V
CC
= 1.6 - 2.7V 0.60*V
CC
Reset threshold voltage (V
IL
)
V
CC
= 2.7 - 3.6V 0.50*V
CC
V
CC
= 1.6 - 2.7V 0.40*V
CC
R
RST
Reset pin Pull-up Resistor 25 kΩ
Symbol Parameter Condition Min. Typ. Max. Units
V
POT-
(1)
POR threshold voltage falling V
CC
V
CC
falls faster than 1V/ms 0.4 1.0
V
V
CC
falls at 1V/ms or slower 0.8 1.0
V
POT+
POR threshold voltage rising V
CC
1.3 1.59 V