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參數(shù)資料
| 型號： | M38039GCH-XXXKP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8.4 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | 14 X 14 MM, 0.80 MM PITCH, PLASTIC, LQFP-64 |
| 文件頁數(shù)： | 83/103頁 |
| 文件大小： | 1412K |
| 代理商： | M38039GCH-XXXKP |
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REJ03B0166-0113 Rev.1.13
Aug 21, 2009
Page 80 of 100
3803 Group (Spec.H QzROM version)
(2) Connection of bypass capacitor across VSS line and VCC
line
In order to stabilize the system operation and avoid the latch-up,
connect an approximately 0.1
F bypass capacitor across the VSS
line and the VCC line as follows:
Connect a bypass capacitor across the VSS pin and the VCC pin
at equal length.
Connect a bypass capacitor across the VSS pin and the VCC pin
with the shortest possible wiring.
Use lines with a larger diameter than other signal lines for VSS
line and VCC line.
Connect the power source wiring via a bypass capacitor to the
VSS pin and the VCC pin.
Fig. 78 Bypass capacitor across the VSS line and the VCC line
(3) Oscillator concerns
In order to obtain the stabilized operation clock on the user
system and its condition, contact the oscillator manufacturer and
select the oscillator and oscillation circuit constants. Be careful
especially when range of voltage and temperature is wide.
Also, take care to prevent an oscillator that generates clocks for a
microcomputer operation from being affected by other signals.
1. Keeping oscillator away from large current signal lines
Install a microcomputer (and especially an oscillator) as far as
possible from signal lines where a current larger than the
tolerance of current value flows.
Reason
In the system using a microcomputer, there are signal lines for
controlling motors, LEDs, and thermal heads or others. When a
large current flows through those signal lines, strong noise
occurs because of mutual inductance.
2. Installing oscillator away from signal lines where potential
levels change frequently
Install an oscillator and a connecting pattern of an oscillator
away from signal lines where potential levels change
frequently. Also, do not cross such signal lines over the clock
lines or the signal lines which are sensitive to noise.
Reason
Signal lines where potential levels change frequently (such as the
CNTR pin signal line) may affect other lines at signal rising edge
or falling edge. If such lines cross over a clock line, clock
waveforms may be deformed, which causes a microcomputer
failure or a program runaway.
Fig. 79 Wiring for a large current signal line/Wiring of
signal lines where potential levels change
frequently
(4) Analog input
The analog input pin is connected to the capacitor of a voltage
comparator. Accordingly, sufficient accuracy may not be
obtained by the charge/discharge current at the time of A/D
conversion when the analog signal source of high-impedance is
connected to an analog input pin. In order to obtain the A/D
conversion result stabilized more, please lower the impedance of
an analog signal source, or add the smoothing capacitor to an
analog input pin.
(5) Difference of memory size
When memory size differ in one group, actual values such as an
electrical characteristics, A/D conversion accuracy, and the
amount of proof of noise incorrect operation may differ from the
ideal values.
When these products are used switching, perform system
evaluation for each product of every after confirming product
specification.
VSS
VCC
VSS
VCC
N.G.
O.K.
XIN
XOUT
VSS
M
Microcomputer
Mutual inductance
Large
current
GND
XIN
XOUT
VSS
CNTR
Do not cross.
N.G.
1. Keeping oscillator away from large current signal lines
2. Installing oscillator away from signal lines where potential
levels change frequently
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
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