Datasheet

Figure 39-4. Oscillator Connection
C
SH UNT
L
M
R
M
C
M
C
STR AY
C
LEX T
C
LEX T
Xin
Crystal
Xout
39.8.2 External 32 kHz Crystal Oscillator (XOSC32K) Characteristics
39.8.2.1 Digital Clock Characteristics
The following table describes the characteristics for the oscillator when a digital clock is applied on XIN32
pin.
Table 39-34. Digital Clock Characteristics
Symbol Parameter Conditions Min. Typ. Max. Units
f
CPXIN32
XIN32 clock frequency - 32.768 - kHz
XIN32 clock duty cycle - 50 - %
39.8.2.2 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 39-35. 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 31K cycles
C
L
Crystal load capacitance - - 12.5 pF
C
SHUNT
Crystal shunt capacitance - 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
SAM D21 Family
Electrical Characteristics at 125°C
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40001882D-page 1090