Rainbow-electronics ATtiny43U Bedienungsanleitung PDF herunterladen (Seite 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

= V

BOT

during the production test. This guarantees that a Brown-out Reset will occur before V

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

POT

Power-on Reset Threshold Voltage (rising) T

= -40 - 85°C1.11.41.6V

Power-on Reset Threshold Voltage (falling)

(1)

= -40 - 85°C0.61.31.6V

PSR

Power-On Slope Rate T

= -40 - 85°C0.01 V/ms

RST

RESET Pin Threshold 0.2 V

0.9 V

RST

Minimum pulse width on RESET Pin

= 1.8V

= 3V

= 5V

2000

700

400

HYST

Brown-out Detector Hysteresis 50 mV

BOD

Min Pulse Width on Brown-out Reset 2 µs

Internal bandgap reference voltage

= 2.7V

=25°C

1.0 1.1 1.2 V

Internal bandgap reference start-up time

= 2.7V

=25°C

40 70 µs

Internal bandgap reference current consumption

= 2.7V,

=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

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

INT

Minimum pulse width for asynchronous external interrupt 50 ns

1 2 ... 153 154 155 156 157 158 159 160 161 162 163 ... 181 182

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