Datasheet

SAM9G45 [DATASHEET]
Atmel-6438O-ATARM-SAM9G45-Datasheet_08-Dec-15
1162
45.5.2 XIN Clock Characteristics
45.6 32 kHz Oscillator Characteristics
Notes: 1. R
S
is the equivalent series resistance.
2. C
LEXT32
is determined by taking into account internal, parasitic and package load capacitance.
Figure 45-3. 32 kHz Oscillator Schematic
Table 45-9. 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
Main oscillator in Bypass mode (i.e., when
MOSCEN = 0 and OSCBYPASS = 1 in
CKGR_MOR). See “PMC Clock Generator Main
Oscillator Register” .
–25pF
R
IN
XIN Pulldown Resistor – 500 kΩ
V
IN
XIN Voltage V
DDOSC
V
DDOSC
V
Table 45-10. 32 kHz Oscillator Characteristics
Symbol Parameter Conditions Min Typ Max Unit
1/(t
CP32KHz
) Crystal Oscillator Frequency – – 32 768 – kHz
C
CRYSTAL32
Load Capacitance Crystal @ 32.768 kHz 6 – 12.5 pF
C
LEXT32
(2)
External Load Capacitance
C
CRYSTAL32
= 6 pF – 6 – pF
C
CRYSTAL32
= 12.5 pF – 19 – pF
Duty Cycle – 40 – 60 %
t
START
Startup Time
R
S
= 50 kΩ
(1)
C
CRYSTAL32
= 6 pF – – 400 ms
C
CRYSTAL32
= 12.5 pF – – 900 ms
R
S
= 100 kΩ
(1)
C
CRYSTAL32
= 6 pF – – 600 ms
C
CRYSTAL32
= 12.5 pF – – 1200 ms
XIN32 XOUT32 GNDBU
C
LEXT32
C
LEXT32
C
CRYSTAL32
SAM9G45