Datasheet

353
8284D–AVR–6/11
ATmega169A/PA/329A/PA/3290A/PA/649A/P/6490A/P
29.5 System and Reset Characteristics
The following characteristics apply only to ATmega169A/169PA
Note: 1. The Power-on Reset will not work unless the supply voltage has been below V
POT
(falling)
29.6 Power-on Reset
29.6.1 ATmega169A/169PA/329A/329PA/3290A/3290PA/649A/649P/6490A/6490PA
revision C and later
Notes: 1. The Power-on Reset will not work unless the supply voltage has been below V
POT
(falling)
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
2µs
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. Reset, Brown-out and Internal Voltage Reference Characteristics,
T
A
= -40°C to 85°C
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)
(1)
0.6 1.3 1.6
SR
ON
Power-on Slope Rate 0.01 10 V/ms