Datasheet

68
8069R–AVR–06/2013
XMEGA A4
Not recommended for new designs -
Use XMEGA A4U series
34.11 POR Characteristics
34.12 Reset Characteristics
34.13 Oscillator Characteristics
Table 34-12. Power-on Reset Characteristics
Symbol Parameter Condition Min Typ Max Units
V
POT-
POR threshold voltage falling V
CC
V
CC
falls faster than 1V/ms 0.4 0.8
V
CC
falls at 1V/ms or slower 0.8 1.3
V
V
POT+
POR threshold voltage rising V
CC
1.3 1.59
Table 34-13. Reset Characteristics
Symbol Parameter Condition Min Typ Max Units
Minimum reset pulse width 90 ns
Reset threshold voltage
V
CC
= 2.7 - 3.6V 0.45*V
CC
V
V
CC
= 1.6 - 2.7V 0.42*V
CC
Table 34-14. Internal 32.768 kHz Oscillator Characteristics
Symbol Parameter Condition Min Typ Max Units
Accuracy
T = 85
C, V
CC
= 3V,
After production calibration
-0.5 0.5 %
Table 34-15. Internal 2 MHz Oscillator Characteristics
Symbol Parameter Condition Min Typ Max Units
Accuracy
T = 85
C, V
CC
= 3V,
After production calibration
-1.5 1.5
%
DFLL Calibration step size T = 25
C, V
CC
= 3V 0.15
Table 34-16. Internal 32 MHz Oscillator Characteristics
Symbol Parameter Condition Min Typ Max Units
Accuracy
T = 85
C, V
CC
= 3V,
After production calibration
-1.5 1.5
%
DFLL Calibration stepsize T = 25
C, V
CC
= 3V 0.2
Table 34-17. Internal 32 kHz, ULP Oscillator Characteristics
Symbol Parameter Condition Min Typ Max Units
Output frequency 32 kHz ULP OSC T = 85C, V
CC
= 3.0V 26 kHz