Owners manual

Electrical Characteristics
H3 Datasheet(Revision1.2) Copyright© 2015 Allwinner Technology Co.,Ltd.All Rights Reserved. Page 610
9.4. Oscillator Electrical Characteristics
H3 contains two external input clocks:X24MIN and X32KIN, two output clocks:X24MOUT and X32KOUT.The 24.000MHz
frequency is used to generate the main source clock for PLL and the main digital blocks，the clock is provided through
X24MIN.Table 9-4 lists the 24MHz crystal specifications.
Table 9-4. 24MHz Oscillator Characteristics
Symbol
Parameter
Min
Typ
Max
Unit
1/(t
CPMAIN
)
Crystal Oscillator Frequency Range
–
24.000
–
MHz
t
ST
Startup Time
–
–
–
ms
Frequency Tolerance at 25 °C
-50
–
+50
ppm
Oscillation Mode
Fundamental
–
Maximum change over temperature range
-50
–
+50
ppm
P
ON
Drive level
–
–
300
uW
C
L
Equivalent Load capacitance
12
18
22
pF
R
S
Series Resistance(ESR)
–
25
–
Ω
Duty Cycle
30
50
70
%
C
M
Motional capacitance
–
–
–
pF
C
SHUT
Shunt capacitance
5
6.5
7.5
pF
R
BIAS
Internal bias resistor
0.4
0.5
0.6
MΩ
The 32768Hz frequency is used for low frequency operation. It supplies the wake-up domain for operation in lowest
power mode. The clock is provided through X32KIN.Table 9-5 lists the 32768Hz crystal specifications.
Table 9-5. 32768Hz Oscillator Characteristics
Symbol
Parameter
Min
Typ
Max
Unit
1/(t
CPMAIN
)
Crystal Oscillator Frequency Range
–
32768
–
Hz
t
ST
Startup Time
–
–
-
ms
Frequency Tolerance at 25 °C
-40
–
+40
ppm
Oscillation Mode
Fundamental
–
Maximum change over temperature range
-50
–
+50
ppm
P
ON
Drive level
–
–
50
uW
C
L
Equivalent Load capacitance
–
–
–
pF
R
S
Series Resistance(ESR)
–
–
–
Ω
Duty Cycle
30
50
70
%
C
M
Motional capacitance
–
–
–
pF
C
SHUT
Shunt capacitance
–
–
–
pF
R
BIAS
Internal bias resistor
–
–
–
MΩ
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