Atmel Evaluation Kit AT91SAM9G25-EK AT91SAM9G25-EK Data Sheet
Product codes
AT91SAM9G25-EK
1105
SAM9G25 [DATASHEET]
11032D–ATARM–10-Mar-2014
Figure 46-2. Main Oscillator Schematics
Note:
A 1K resistor must be added on XOUT pin for crystals with frequencies lower than 8 MHz.
46.5.1 Crystal Oscillator Characteristics
The following characteristics are applicable to the operating temperature range: T
A
= -40°C to 85°C and worst case of power sup-
ply, unless otherwise specified.
46.5.2 XIN Clock Characteristics
Note:
1. These characteristics apply only when the Main Oscillator is in bypass mode (i.e., when MOSCEN = 0 and OSCBY-
PASS = 1) in the CKGR_MOR. See “PMC Clock Generator Main Oscillator Register” in the PMC section.
1K
XIN
XOUT
GNDPLL
C
LEXT
C
LEXT
C
CRYSTAL
Table 46-8. Crystal Characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
ESR
Equivalent Series Resistor Rs
@16 MHz
@12 MHz C
CRYSTAL
Max
@12 MHz C
CRYSTAL
Min
80
90
110
Ω
C
M
Motional Capacitance
5
9
fF
C
S
Shunt Capacitance
7
pF
Table 46-9. XIN Clock Electrical Characteristics
Symbol
Parameter
Conditions
Min
Max
Unit
1/(t
CPXIN
)
XIN Clock Frequency
50
MHz
t
CPXIN
XIN Clock Period
20
ns
t
CHXIN
XIN Clock High Half-period
0.4
× t
CPXIN
0.6
× t
CPXIN
ns
t
CLXIN
XIN Clock Low Half-period
0.4
× t
CPXIN
0.6
× t
CPXIN
ns
C
IN
XIN Input Capacitance
25
pF
R
IN
XIN Pulldown Resistor
500
k
Ω
V
IN
XIN Voltage
V
DDOSC
V
DDOSC
V