Datasheet

1303
SAM9M10 [DATASHEET]
6355F–ATARM–12-Mar-13
47.6 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.
47.6.1 32 kHz Crystal Characteristics
Table 47-10. 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
ST
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
Table 47-11. 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 3 fF
C
S
Shunt Capacitance Crystal @ 32.768 kHz 2 pF
XIN32 XOUT32 GNDBU
C
LEXT32
C
LEXT32
C
CRYSTAL32
SAM9M10