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| AT91SAM9XE128_1 Datasheet, PDF (814/866 Pages) ATMEL Corporation – AT91 ARM Thumb Microcontrollers | |||
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43.5 Crystal Oscillator Characteristics
The following characteristics are applicable to the operating temperature range: TA = -40°C to 85°C and worst case of
power supply, unless otherwise specified.
43.5.1 32 kHz Oscillator Characteristics
Table 43-11. 32 kHz Oscillator Characteristics
Symbol
Parameter
Conditions
Min
1/(tCP32KHz) Crystal Oscillator Frequency
CCRYSTAL32
Load Capacitance
Crystal @ 32.768 kHz
6
CLEXT32(2)
External Load Capacitance
CCRYSTAL32 = 6 pF
CCRYSTAL32 = 12.5 pF
Duty Cycle
40
tST
Notes:
Startup Time
RS = 50 kΩ(1)
RS = 100 kΩ(1)
CCRYSTAL32 = 6 pF
CCRYSTAL32 = 12.5 pF
CCRYSTAL32 = 6 pF
CCRYSTAL32 = 12.5 pF
1. RS is the equivalent series resistance.
2. CLEXT32 is determined by taking into account internal, parasitic and package load capacitance.
Typ
32 768
4
17
Max Unit
kHz
12.5 pF
pF
pF
60
%
300 ms
900 ms
600 ms
1200 ms
AT91SAM9XE
XIN32
XOUT32 GNDBU
CCRYSTAL32
CLEXT32
CLEXT32
Table 43-12. Crystal Characteristics
Symbol
Parameter
ESR
Equivalent Series Resistor Rs
CM
Motional Capacitance
CS
Shunt Capacitance
Conditions
Crystal @ 32.768 kHz
Crystal @ 32.768 kHz
Crystal @ 32.768 kHz
Min
Typ
Max
Unit
50
100
kΩ
1
3
fF
0.8
1.7
pF
814 AT91SAM9XE128/256/512 Preliminary
6254BâATARMâ29-Apr-09
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