Datasheet

102
XMEGA A3U [DATASHEET]
Atmel-8386D-AVR-ATxmega64A3U-128A3U-192A3U-256A3U–03/2014
36.2.14.3 Calibrated and tunable 32MHz internal oscillator characteristics
Table 36-56. 32MHz internal oscillator characteristics.
36.2.14.4 32kHz Internal ULP Oscillator characteristics
Table 36-57. 32kHz internal ULP oscillator characteristics.
36.2.14.5 Internal Phase Locked Loop (PLL) characteristics
Table 36-58. Internal PLL characteristics.
Note: 1. The maximum output frequency vs. supply voltage is linear between 1.8V and 2.7V, and can never be higher than four times the maximum CPU frequency.
Symbol Parameter Condition Min. Typ. Max. Units
Frequency range
DFLL can tune to this frequency over
voltage and temperature
30 55 MHz
Factory calibrated frequency 32 MHz
Factory calibration accuracy T = 85C, V
CC
= 3.0V -1.5 1.5 %
User calibration accuracy -0.2 0.2 %
DFLL calibration step size 0.23 %
Symbol Parameter Condition Min. Typ. Max. Units
Output frequency 32 kHz
Accuracy -30 30 %
Symbo
l Parameter Condition Min. Typ. Max. Units
f
IN
Input Frequency Output frequency must be within f
OUT
0.4 64 MHz
f
OUT
Output frequency
(1)
V
CC
= 1.6 - 1.8V 20 48
MHz
V
CC
= 2.7 - 3.6V 20 128
Start-up time 25 µs
Re-lock time 25 µs