SAM7X128_14 Datasheet, PDF (587/662 Pages) ATMEL Corporation – ARM-based Flash MCU

38.4.2 Main Oscillator Characteristics
Table 38-9. Main Oscillator Characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
1/(t_CPMAIN)
C_L1, C_L2
Crystal Oscillator Frequency
Internal Load Capacitance (C_L1 = C_L2)
Integrated Load Capacitance
((XIN or XOUT))
3
16
20
MHz
34
40
46
pF
C_L ⁽⁶⁾
Equivalent Load Capacitance
Integrated Load Capacitance
(XIN and XOUT in series)
17
20
23
pF
Duty Cycle
30
50
70
%
t_ST
I_DDST
P_ON
Startup Time
Standby Current Consumption
Drive level
I_{DD ON}
Current dissipation
V_DDPLL = 1.2 to 2V
C_S = 3 pF⁽¹⁾ 1/(t_CPMAIN) = 3 MHz
C_S = 7 pF⁽¹⁾ 1/(t_CPMAIN) = 16 MHz
C_S = 7 pF⁽¹⁾ 1/(t_CPMAIN) = 20 MHz
Standby mode
@3 MHz
@8 MHz
@16 MHz
@20 MHz
@3 MHz ⁽²⁾
@8 MHz ⁽³⁾
@16 MHz ⁽⁴⁾
@20 MHz ⁽⁵⁾
14.5
ms
1.4
1
1
µA
15
30
µΩ
50
50
150
250
150
250
µA
300
450
400
550
C_LEXT ⁽⁶⁾
Maximum external capacitor
on XIN and XOUT
10
pF
Notes:
1. C_S is the shunt capacitance.
2. R_S = 100-200 Ω; C_SHUNT = 2.0 - 2.5 pF; C_M = 2 – 1.5 fF (typ, worst case) using 1 K ohm serial resistor on xout.
3. R_S = 50-100 Ω; C_SHUNT = 2.0 - 2.5 pF; C_M = 4 - 3 fF (typ, worst case).
4. R_S = 25-50 Ω; C_SHUNT = 2.5 - 3.0 pF; C_M = 7 -5 fF (typ, worst case).
5. R_S = 20-50 Ω; C_SHUNT = 3.2 - 4.0 pF; C_M = 10 - 8 fF (typ, worst case).
6. C_L and C_LEXT →
AT91SAM7X
C_L
XIN
XOUT
C_LEXT
C_LEXT
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
587