Datasheet

SAM9263 [DATASHEET]
Atmel-6249N-ATARM-SAM9263-Datasheet_14-Mar-16
1030
Notes: 1. R
S
is the equivalent series resistance, C
L
is the equivalent load capacitance.
2. C
LEXT32
is determined by taking into account internal parasitic and package load capacitance.
3. Additional user load capacitance should be subtracted from C
LEXT32
.
Figure 46-2. 32 kHz Oscillator Schematic
46.6.2 32 kHz Crystal Characteristics
46.6.3 Main Oscillator Characteristics
t
START
Startup Time
R
S
= 50 kΩ, C
L
= 6 pF
(1)
400 ms
R
S
= 50 kΩ, C
L
= 12.5 pF
(1)
900 ms
R
S
= 100 kΩ, C
L
= 6 pF
(1)
600 ms
R
S
= 100 kΩ, C
L
= 12.5 pF
(1)
1200 ms
Table 46-9. 32 kHz Oscillator Characteristics (Continued)
Symbol Parameter Conditions Min Typ Max Unit
XIN32 XOUT32 GNDBU
C
LEXT32
C
LEXT32
SAM9263
C
CRYSTAL32
Table 46-10. 32 kHz Crystal Characteristics
Symbol Parameter Conditions Min Typ Max Unit
ESR Equivalent Series Resistor Rs Crystal @ 32.768 kHz 50 100 kΩ
C
m
Motional Capacitance Crystal @ 32.768 kHz 0.6 3 fF
C
SHUNT
Shunt Capacitance Crystal @ 32.768 kHz 0.6 2 pF
Table 46-11. Main Oscillator Characteristics
Symbol Parameter Conditions Min Typ Max Unit
1/(t
CPMAIN
) Crystal Oscillator Frequency 3 16 20 MHz
C
CRYSTAL
Crystal Load Capacitance 12.5 15 17.5 pF
C
LEXT
(6)
External Load Capacitance
C
CRYSTAL
= 12.5 pF
(5)
15 pF
C
CRYSTAL
= 15 pF
(5)
18 pF
C
CRYSTAL
= 17.5 pF
(5)
22 pF
Duty Cycle 40 50 60 %
t
START
Startup Time
V
DDPLL
= 3–3.6 V
C
SHUNT
= 3 pF 1/(t
CPMAIN
) = 3 MHz
C
SHUNT
= 7 pF 1/(t
CPMAIN
) = 8 MHz
C
SHUNT
= 7 pF 1/(t
CPMAIN
) = 16 MHz
C
SHUNT
= 7 pF 1/(t
CPMAIN
) = 20 MHz
20
4
2
2
ms