Data Sheet

973
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
36.11.3 Digital Frequency Locked Loop (DFLL48M) Characteristics
Table 36-49. DFLL48M Characteristics - Open Loop Mode
(1)
Note: 1. DFLL48M in Open loop after calibration at room temperature.
Table 36-48. 32kHz Crystal Oscillator Characteristics, Device Variant B
Symbol Parameter Conditions Min. Typ. Max. Units
f
OUT
Crystal oscillator frequency
I
- 32768 - Hz
t
STARTUP
Startup time ESR
XTAL
= 39.9kΩ, C
L
= 12.5pF - 28K 30K cycles
C
L
Crystal load capacitance
I
- - 12.5
pF
C
SHUNT
Crystal shunt capacitance
I
- 0.1 -
C
XIN32
Parasitic capacitor load
TQFP64/48/32 packages
- 3.2 -
C
XOUT32
Parasitic capacitor load - 3.7 -
I
XOSC32K
Current consumption - 1.22 2.19 µA
ESR
Crystal equivalent series
resistance f=32.768kHz
Safety Factor = 3
C
L
=12.5pF - - 100 kΩ
Symbol Parameter Conditions Min. Typ. Max. Units
f
OUT
Output frequency
I DFLLVAL.COARSE =
DFLL48M COARSE CAL
DFLLVAL.FINE = 512
47 48 49 MHz
I
DFLL
Power consumption on V
DDIN
I DFLLVAL.COARSE =
DFLL48M COARSE CAL
DFLLVAL.FINE = 512
- 403 453 µA
t
STARTUP
Startup time
DFLLVAL.COARSE =
DFLL48M COARSE CAL
DFLLVAL.FINE = 512
f
OUT
within 90% of final value
7 8 9 µs