Data Sheet

1092
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
Table A-39. 32kHz Crystal Oscillator Characteristics (Device Variant A)
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 31K 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
- 3.1 -
C
XOUT32
Parasitic capacitor load - 3.3 -
I
XOSC32K
Current consumption - 1.22 2.44 µA
ESR
Crystal equivalent series
resistance f=32.768kHz
Safety Factor = 3
C
L
=12.5pF - - 141 kΩ
Table A-40. 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 2.2 µA
ESR
Crystal equivalent series
resistance f=32.768kHz
Safety Factor = 3
C
L
=12.5pF - - 100 kΩ