參數(shù)資料
型號： LH7A400N0B000
廠商： Sharp Corporation
英文描述： 32-Bit System-on-Chip
中文描述： 32位系統(tǒng)級芯片
文件頁數(shù)： 47/53頁
文件大?。?/td> 446K
代理商： LH7A400N0B000
32-Bit System-on-Chip
LH7A400
Preliminary Data Sheet
12/8/03
47
Figure 20. Signal Timing After Reset
Figure 21. 32.768 kHz External Oscillator Components and Schematic
≤
7.8125 ms
7.8125 ms
START UP
WAKEUP
(asynchronous)
CLKEN
HCLK
STABLE CLOCK
LH7A400-175
ENABLE
XTALIN
XTALOUT
GND
NOTES:
1. Y1 is a parallel-resonant type crystal. (See table)
2. The nominal values for C1 and C2 shown are for
a crystal specified at 12.5 pF load capacitance (CL).
3. The values for C1 and C2 are dependent upon
the cystal's specified load capacitance and PCB
stray capacitance.
4. R1 must be in the circuit.
5. Ground connections should be short and return
to the ground plane which is connected to the
processor's core ground pins.
6. Tolerance for R1, C1, C2 is
≤
5%.
GND
32.768 kHz
18 M
LH7A400-187
PARAMETER
DESCRIPTION
32.768 kHz Crystal
Tolerance
Aging
Load Capacitance
ESR (MAX.)
Drive Level
Recommended Part
Parallel Mode
±30 ppm
±3 ppm
12.5 pF
50 k
1.0 μW (MAX.)
MTRON SX1555 or equivalent
C1
15 pF
C2
18 pF
R1
Y1
INTERNAL TO
THE LH7A400
EXTERNAL TO
THE LH7A400
RECOMMENDED CRYSTAL SPECIFICATIONS
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