Datasheet

33.6 System and Reset Characteristics
Table 33-6. Reset, Brown-out and Internal Voltage Characteristics
(1)
Symbol Parameter Condition Min. Typ Max Units
V
POT
Power-on Reset Threshold Voltage (rising) 1.1 1.5 1.7 V
Power-on Reset Threshold Voltage (falling)
(2)
0.6 1.0 1.7 V
SR
ON
Power-on Slope Rate 0.01 - 9 V/ms
V
RST
RESET Pin Threshold Voltage 0.2 V
CC
- 0.9 V
CC
V
t
RST
Minimum pulse width on RESET Pin - - 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 1.0 1.1 1.2 V
t
BG
Bandgap reference start-up time V
CC
=2.7
T
A
=25°C
- 40 70 μs
I
BG
Bandgap reference current consumption V
CC
=2.7
T
A
=25°C
- 10 - μA
Note:
1. Values are guidelines only.
2. The Power-on Reset will not work unless the supply voltage has been below VPOT (falling)
Table 33-7. BODLEVEL Fuse Coding
(1)(2)
BODLEVEL [2:0] Fuses Min. V
BOT
Typ. V
BOT
Max V
BOT
Units
111 BOD Disabled
110 1.7 1.8 2.0 V
101 2.5 2.7 2.9
100 4.1 4.3 4.5
011 - 000 Reserved
Note: 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.
Note: V
BOT
tested at 25°C and 85°C in production
ATmega328PB
Electrical Characteristics
© 2018 Microchip Technology Inc.
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