參數(shù)資料
型號(hào): M34502M2-XXXFP
元件分類(lèi): 微控制器/微處理器
英文描述: 4-BIT, MROM, 4.4 MHz, MICROCONTROLLER, PDSO24
封裝: 0.300 INCH, 0.80 MM PITCH, PLASTIC, SSOP-24
文件頁(yè)數(shù): 125/215頁(yè)
文件大小: 3358K
代理商: M34502M2-XXXFP
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4502 Group User’s Manual
APPENDIX
3-39
3.4 Notes on noise
3.4.3 Wiring to analog input pins
Connect an approximately 100
to 1 k resistor
to an analog signal line which is connected to an
analog input pin in series. Besides, connect the
resistor to the microcomputer as close as possible.
Connect an approximately 1000 pF capacitor across
the VSS pin and the analog input pin. Besides,
connect the capacitor to the VSS pin as close as
possible. Also, connect the capacitor across the
analog input pin and the VSS pin at equal length.
q
Reason
Signals which is input in an analog input pin
(such as an A-D converter/comparator input
pin) are usually output signals from sensor.
The sensor which detects a change of event
is installed far from the printed circuit board
with a microcomputer, the wiring to an analog
input pin is longer necessarily. This long wiring
functions as an antenna which feeds noise
into the microcomputer, which causes noise
to an analog input pin.
Fig. 3.4.7 Analog signal line and a resistor and a
capacitor
Analog
input pin
VSS
Noise
Thermistor
Microcomputer
N.G.
O.K.
(Note)
Note : The resistor is used for dividing
resistance with a thermistor.
3.4.4 Oscillator concerns
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.
q 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.
Fig. 3.4.8 Wiring for a large current signal line
XIN
XOUT
VSS
M
Microcomputer
Mutual inductance
Large
current
GND
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