ATmega48PA/88PA/168PA/328P
28.5 System and Reset Characteristics
Table 28-3. Reset, Brown-out and Internal Voltage Characteristics(1)
Symbol
Parameter
Min
1.1
Typ
1.4
1.3
Max
1.6
Units
V
Power-on Reset Threshold Voltage (rising)
Power-on Reset Threshold Voltage (falling)(2)
Power-on Slope Rate
VPOT
0.6
1.6
V
SRON
VRST
tRST
0.01
0.2 VCC
10
V/ms
V
RESET Pin Threshold Voltage
Minimum pulse width on RESET Pin
Brown-out Detector Hysteresis
Min Pulse Width on Brown-out Reset
0.9 VCC
2.5
µs
VHYST
tBOD
50
2
mV
µs
VCC=2.7
TA=25°C
VBG
tBG
IBG
Bandgap reference voltage
1.0
1.1
40
10
1.2
70
V
VCC=2.7
Bandgap reference start-up time
Bandgap reference current consumption
µs
µA
TA=25°C
VCC=2.7
TA=25°C
Notes: 1. Values are guidelines only.
2. The Power-on Reset will not work unless the supply voltage has been below VPOT (falling)
Table 28-4. BODLEVEL Fuse Coding(1)
BODLEVEL 2:0 Fuses
Min VBOT
Typ VBOT
BOD Disabled
Max VBOT
Units
111
110
101
100
011
010
001
000
1.7
2.5
4.1
1.8
2.7
4.3
2.0
2.9
4.5
V
Reserved
Notes: 1. VBOT may be below nominal minimum operating voltage for some devices. For devices where this is the case, the device is
tested down to VCC = VBOT during the production test. This guarantees that a Brown-Out Reset will occur before VCC 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 ]
