Datasheet

Figure 54-6. Oscillator Connection
XIN
CLEXT
CLEXT
CM
RM
LM
CSHUNT
XOUT
DEVICE
Crystal
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 datasheet. The capacitance of the external
capacitors (C
LEXT
) can then be computed as follows:
C
LEXT
= 2 * (C
L
- C
PARA
- C
PCB
- C
SHUNT
)
Where:
• C
PARA
is the internal load capacitor parasitic between XIN and XOUT and can be computed as
following:
Equation 54-1.


=


* 



+ 

• C
PCB
is the capacitance of the PCB
• C
SHUNT
is the shunt capacitance of the crystal as specified by the crystal manufacturer
Table 54-44. Multi-Crystal Oscillator Electrical Characteristics
Symbol
Parameter Conditions Min. Typ. Max. Units
F
OUT
Crystal oscillator frequency 8 - 48 MHz
C
L
Crystal Load F = 8 MHz - - 20 pF
F = 16 MHz - - 20
F = 32 MHz - - 13
F = 48 MHz - - 13
ESR Crystal Equivalent Series Resistance - SF=3 F = 8 MHz, C
L
=20 pF - IMULT = 0x3 - - 181 Ω
F = 16 MHz, C
L
= 20 pF - IMULT = 0x4 - - 180
F= 24 MHz, C
L
= 20 pF - IMULT = 0x5 - - 70
F = 48 MHz, C
L
= 13 pF - IMULT = 0x6 - - 70
C
XIN
Parasitic load capacitor - - 6.3 - pF
C
XOUT
- - 5.9 -
D
L
Drive Level
(1)
ENALC = ON - - 100 μW
T
START
Startup time F = 8 MHz, C
L
= 20 pF, C
SHUNT
= 2 pF - IMULT = 0x3 - 39700 72200 Cycles
F = 16 MHz, C
L
= 20 pF, C
SHUNT
= 1.5 pF - IMULT = 0x4 - 37550 62000
F = 24 MHz, C
L
= 20 pF, C
SHUNT
= 2.5 pF - IMULT = 0x5 - 32700 68500
F = 48 MHz, C
L
= 13 pF, C
SHUNT
= 5 pF - IMULT = 0x6 - 18400 38500
SAM D5x/E5x Family Data Sheet
Electrical Characteristics at 85°C
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 2013