Datasheet

37.13.2 External 32 kHz Crystal Oscillator (XOSC32K) Characteristics
37.13.2.1 Digital Clock Characteristics
The following table describes the characteristics for the oscillator when a digital clock is applied on XIN32
pin.
Table 37-49. Digital Clock Characteristics
Symbol Parameter Conditions Min. Typ. Max. Units
f
CPXIN32
XIN32 clock frequency - 32.768 - kHz
XIN32 clock duty cycle - 50 - %
37.13.2.1.1 Crystal Oscillator Characteristics
Figure 37-6 and the equation in also applies to the 32 kHz oscillator connection. The user must choose a
crystal oscillator where the crystal load capacitance C
L
is within the range given in the table. The exact
value of C
L
can be found in the crystal data sheet.
Table 37-50. 32kHz Crystal Oscillator Characteristics (Device Variant A)
Symbol Parameter Conditions Min. Typ. Max. Units
f
OUT
Crystal oscillator frequency - 32768 - Hz
t
STARTUP
Startup time ESR
XTAL
= 39.9 kΩ, C
L
= 12.5 pF
- 28K 30K cycles
C
L
Crystal load capacitance - - 12.5 pF
C
SHUNT
Crystal shunt capacitance - 0.1 -
C
XIN32
Parasitic capacitor load - 3.1 -
C
XOUT32
Parasitic capacitor load - 3.3 -
I
XOSC32K
Current consumption - 1.22 2.19 µA
ESR Crystal equivalent series resistance
f=32.768kHz
, Safety Factor = 3
C
L
=12.5pF - - 141 kΩ
Table 37-51. 32kHz Crystal Oscillator Characteristics (Device Variant B,C, D, and L)
Symbol Parameter Conditions Min. Typ. Max. Units
f
OUT
Crystal oscillator frequency - 32768 - Hz
t
STARTUP
Startup time ESR
XTAL
= 39.9 kΩ, C
L
= 12.5 pF
- 28K 30K cycles
C
L
Crystal load capacitance - - 12.5 pF
C
SHUNT
Crystal shunt capacitance - 0.1 -
C
XIN32
Parasitic capacitor load - 3.2 -
C
XOUT32
Parasitic capacitor load - 3.7 -
I
XOSC32K
Current consumption - 1.22 2.19 µA
SAM D21 Family
Electrical Characteristics
© 2018 Microchip Technology Inc.
Datasheet Complete
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