at91sam9g20-cu ATMEL Corporation, at91sam9g20-cu Datasheet - Page 767

• Manufacturer Part Number: at91sam9g20-cu
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

41.5.5
Table 41-13. Main Oscillator Characteristics
Notes:
6384B–ATARM–15-Dec-08
Symbol
1/(t
C
C
t
I
P
I
ST
DDST
DD ON
ON
CRYSTAL
LEXT
CPMAIN
(7)
1. C
2. R
3. R
4. R
5. R
6. Additional user load capacitance should be subtracted from C
7. C
)
Main Oscillator Characteristics
S
S
S
S
S
LEXT
Parameter
Crystal Oscillator Frequency
Crystal Load Capacitance
External Load Capacitance
Duty Cycle
Startup Time
Standby Current Consumption
Drive Level
Current Dissipation
is the shunt capacitance.
= 100 to 200 Ω; C
= 50 to 100 Ω; C
= 25 to 50 Ω; C
= 20 to 50 Ω; C
is determined by taking into account internal, parasitic and package load capacitance.
S
S
S
= 2.5 to 3.0 pF; C
= 3.2 to 4.0 pF; C
S
= 2.0 to 2.5 pF; C
= 2.0 to 2.5 pF; C
C
LEXT
Conditions
C
C
V
C
C
C
C
Standby mode
@ 3 MHz
@ 8 MHz
@ 16 MHz
@ 20 MHz
@ 3 MHz
@ 8 MHz
@ 16 MHz
@ 20 MHz
DDOSC
CRYSTAL
CRYSTAL
S
S
S
S
M
M
AT91SAM92G20
M
= 3 pF
= 7 pF
= 7 pF
= 7 pF
= 7 to 5 pF (typ, worst case).
= 10 to 8 pF (typ, worst case).
M
= 4 to 3 pF (typ, worst case).
XIN
= 2 to 1.5 pF (typ, worst case) using 1 kΩ serial resistor on XOUT.
= 3 to 3.6V
C
= 12.5 pF
= 17.5 pF
(2)
(3)
(1)
(1)
(1)
(1)
CRYSTAL
(4)
(5)
1/(t
1/(t
1/(t
1/(t
CPMAIN
CPMAIN
CPMAIN
CPMAIN
C
(6)
(6)
LEXT
1K
) = 3 MHz
) = 8 MHz
) = 16 MHz
) = 20 MHz
XOUT
LEXT
.
AT91SAM9G20 Preliminary
GNDPLL
12.5
Min
40
3
Typ
280
380
500
580
16
16
26
50
Max
17.5
14.5
380
510
630
750
1.4
20
60
15
30
50
50
4
1
1
MHz
Unit
µW
ms
µA
µA
pF
pF
pF
%
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