Datasheet

39.8 Oscillators Characteristics
39.8.1 Crystal Oscillator (XOSC) Characteristics
39.8.1.1 Digital Clock Characteristics
The following table describes the characteristics for the oscillator when a digital clock is applied on XIN.
Table 39-31. Digital Clock Characteristics
Symbol Parameter Conditions Min. Typ. Max. Units
f
CPXIN
XIN clock frequency - - 32 MHz
39.8.1.2 Crystal Oscillator Characteristics
The following table describes the characteristics for the oscillator when a crystal is connected between
XIN and XOUT . 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. The
capacitance of the external capacitors (C
LEXT
) can then be computed as follows:
C
LEXT
= 2 C
L
+  C
STRAY
 C
SHUNT
where C
STRAY
is the capacitance of the pins and PCB, C
SHUNT
is the shunt capacitance of the crystal.
Table 39-32. Crystal Oscillator Characteristics (Device Variant A)
Symbol Parameter Conditions Min. Typ. Max. Units
f
OUT
Crystal oscillator frequency 0.4 - 32 MHz
ESR Crystal Equivalent Series
Resistance
Safety Factor = 3
The AGC doesn’t have any
noticeable impact on these
measurements.
f = 0.455 MHz, C
L
= 100pF
XOSC.GAIN = 0
- - 5.6K Ω
f = 2MHz, C
L
= 20pF
XOSC.GAIN = 0
- - 416
f = 4MHz, C
L
= 20pF
XOSC.GAIN = 1
- - 243
f = 8 MHz, C
L
= 20pF
XOSC.GAIN = 2
- - 138
f = 16 MHz, C
L
= 20pF
XOSC.GAIN = 3
- - 66
f = 32MHz, C
L
= 18pF
XOSC.GAIN = 4
- - 56
C
XIN
Parasitic capacitor load - 5.9 - pF
C
XOUT
Parasitic capacitor load - 3.2 - pF
SAM D21 Family
Electrical Characteristics at 125°C
© 2018 Microchip Technology Inc.
Datasheet Complete
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