Rainbow Electronics ATtiny43U - Manual (Page 158)

158
8048B–AVR–03/09
ATtiny43U
20.5 System and Reset Characteristics
Note: 1. The Power-on Reset will not work unless the supply voltage has been below V
POT
(falling)
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.
20.6 External Interrupt Characteristics
Table 20-4. 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 - 85
°
C 1.1 1.4 1.6 V
Power-on Reset Threshold Voltage (falling) (1) T
A
= -40 - 85
°
C 0.6 1.3 1.6 V
V
PSR
Power-On Slope Rate T
A
= -40 - 85
°
C 0.01 V/ms
V
RST
RESET Pin Threshold 0.2 V
CC
0.9 V
CC
V
t
RST
Minimum pulse width on RESET Pin
V
CC
= 1.8V
V
CC
= 3V
V
CC
= 5V
2000
700
400 ns
V
HYST
Brown-out Detector Hysteresis 50 mV
t
BOD
Min Pulse Width on Brown-out Reset 2 µs
V
BG
Internal bandgap reference voltage
V
CC
= 2.7V
T
A
= 25°C
1.0 1.1 1.2 V
t
BG
Internal bandgap reference start-up time
V
CC
= 2.7V
T
A
= 25°C
40 70 µs
I
BG
Internal bandgap reference current consumption
V
CC
= 2.7V,
T
A
= 25°C
15 µA
Table 20-5. 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
V
101 2.5 2.7 2.9
100 4.1 4.3 4.5
011
Reserved
010
001
000
Table 20-6. Characteristics of Asynchronous External Interrupt
Symbol Parameter Condition Min Typ Max Unit
t
INT
Minimum pulse width for asynchronous external interrupt 50 ns