參數(shù)資料
型號(hào)： M37549G1FP
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO24
封裝： 5.30 X 10.10 MM, 0.80 MM PITCH, PLASTIC, SSOP-24
文件頁(yè)數(shù)： 58/86頁(yè)
文件大?。?/td> 1375K
代理商： M37549G1FP
Rev.2.02
Mar 31, 2009
Page 59 of 81
REJ03B0202-0202
7549 Group
2. Connection of bypass capacitor across VSS line
and VCC line
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 76. Bypass capacitor across the VSS line and the
VCC line
3. Wiring to analog input pins
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.
4. Oscillator concerns
Take care to prevent an oscillator that generates clocks for a mi-
crocomputer 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 toler-
ance 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 wave-
forms may be deformed, which causes a microcomputer failure
or a program runaway.
Fig 77.
Wiring for a large current signal line/Writing of signal
lines where potential levels change frequently
(3) Oscillator protection using VSS pattern
As for a two-sided printed circuit board, print a VSS pattern on
the underside (soldering side) of the position (on the component
side) where an oscillator is mounted.
Connect the VSS pattern to the microcomputer VSS pin with the
shortest possible wiring. Besides, separate this VSS pattern from
other VSS patterns.
Fig 78. VSS pattern on the underside of an oscillator
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
Oscillator wiring
pattern example
An example of VSS patterns on the
underside of a printed circuit board
Separate the VSS line for oscillation from other VSS lines
XIN
XOUT
VSS
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