SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 1405

• Manufacturer Part Number: SAM3X8E
• Manufacturer: Atmel Corporation

45.4.3
Table 45-15. 32.768 kHz Crystal Oscillator Characteristics
Notes:
Where
45.4.4
Table 45-16. Crystal Characteristics
11057A–ATARM–17-Feb-12
Symbol
F
I
P
R
C
C
Symbol
ESR
C
C
DDST
req
ON
f
LEXT
para
M
SHUNT
C
1. R
PCB
32.768 kHz Crystal Oscillator Characteristics
32.768 kHz Crystal Characteristics
is the capacitance of the printed circuit board (PCB) track layout from the crystal to the SAM3 pin.
S
is the series resistor.
Parameter
Operating Frequency
Supply Ripple Voltage (on VDDBU)
Duty Cycle
Startup Time
Current consumption
Standby Current Consumption
Drive level
Internal resistor
Maximum external capacitor
on XIN32 and XOUT32
Internal Parasitic Capacitance
Parameter
Equivalent Series Resistor Rs
Motional capacitance
Shunt capacitance
C
LEXT
XIN32
C
LEXT
= 2x(
C
CRYSTAL
Conditions
Normal mode with crystal
Rms value, 10 KHz to 10 MHz
Rs < 50K
Rs < 100K
(1)
Rs < 50K
Rs < 100K
(1)
Standby mode @ 3.6V
between XIN32 and XOUT32
Conditions
Crystal @ 32.768 KHz
Crystal @ 32.768 KHz
Crystal @ 32.768 KHz
SAM3
–
C
para
–
C
CL = 12.5 pF
CL = 6 pF
CL = 12.5 pF
CL = 6 pF
CL = 12.5 pF
CL = 6 pF
CL = 12.5 pF
CL = 6 pF
PCB
C
XOUT32
LEXT
).
Min
0.6
0.6
Min
1.2
40
Typ
650
450
900
650
1.4
Typ
50
10
50
32.768
1200
1400
1200
1600
1400
Max
900
300
500
0.1
1.6
30
60
20
5
SAM3X/A
Max
100
3
2
Unit
KHz
mV
μW
M
ms
nA
nA
pF
pF
%
Unit
K
pF
fF
1405