A31 Datasheet, PDF (40/42 Pages) DB Lectro Inc – SCA CONNECTOR IDC TYPE(FEMALE)

VCC-RTC
Power Supply For RTCLDO/LOSC/RCOSC
2.7
3.0
VDD-RTC
Power Supply For RTC/Alarm
0.7
1.1
VDD-SYS
Power supply for VDD_SYS
0.7
1.1
VDD-CPU
Power Supply for CPU
0.7
1.1
VDD-GPU
Power supply for GPU
0.7
1.1
Table 6-2 Recommended Operating Conditions
A31
Datasheet
3.3
V
1.32
V
1.32
V
1.32
V
1.32
V
6.3. DC ELECTRICAL CHARACTERISTICS
Table 6-3 summarizes the DC electrical characteristics of A31.
Symbol
VIH
VIL
RPU
RPD
IIH
IIL
VOH
VOL
IOZ
CIN
COUT
Parameter
Min
Typ
High-Level Input Voltage
0.7*VCC
-
Low-Level Input Voltage
-0.3
0
Input pull-up resistance
50
100
Input pull-down resistance
50
100
High-Level Input Current
/
10
Low-Level Input Current
/
10
High-Level Output Voltage
VCC-0.2
/
Low-Level Output Voltage
/
/
Tri-State Output Leakage Current
-10
/
Input Capacitance
/
/
Output Capacitance
/
/
Table 6-3 DC Electrical Characteristics
Max
Unit
VCC+0.3
V
0.3*VCC
V
150
KΩ
150
KΩ
/
uA
/
uA
/
V
0.2
V
10
uA
5
pF
5
pF
6.4. OSCILLATOR ELECTRICAL CHARACTERISTICS
The A31 clock control module includes 11PLLs, a main oscillator, an on-chip RC oscillator of 466.9KHz
~867.1KHz, and a 32768Hz low power oscillator.
The 24.000MHz frequency is used to generate the main source clock for PLL and the main digital blocks, and
the 32768Hz oscillator is used only to provide a low power accurate reference for RTC.
24MHz Oscillator Characteristics
Table 6-4 lists the 24MHz crystal specifications.
Symbol
1/(tCPMAIN)
tST
PON
CL
CL1,CL2
RS
CM
Parameter
Crystal Oscillator Frequency Range
Startup Time
Frequency Tolerance at 25 °C
Oscillation Mode
Maximum change over temperature range
Drive level
Equivalent Load capacitance
Internal Load capacitance(CL1=CL2)
Series Resistance(ESR)
Duty Cycle
Motional capacitance
Min
Typ
-
24.000
–
–
-40
–
Fundamental
-50
–
–
–
–
–
–
30
50
–
–
Max
-
+40
+50
50
–
–
–
70
Unit
MHz
ms
ppm
–
ppm
uW
pF
pF
Ω
%
pF
A31 Datasheet (Revision 1.4)
Copyright © 2013 Allwinner Technology. All Rights Reserved.
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