參數資料
型號： 38D5
廠商： Renesas Technology Corp.
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述： 單芯片8位CMOS微機
文件頁數： 96/141頁
文件大?。?/td> 2027K
代理商： 38D5
Rev.3.01
REJ03B0158-0301
Aug 08, 2007
Page 96 of 134
38D5 Group
(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. 94 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.
X
IN
X
OUT
V
SS
M
Microcomputer
Mutual inductance
Large
current
GND
X
IN
X
OUT
V
SS
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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PDF描述
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相關代理商/技術參數
參數描述
38D5_07 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Standard Characteristics Example
38D5_08 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
38D511G015FE6AD 制造商:Sprague/Vishay 功能描述:AL015X751
38D5-FMV 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Standard Characteristics (Flash Memory Version)
38DDP11B11M1QT 功能描述:SWITCH PUSH DPDT,O-N-O,N,SL,LF , 制造商:grayhill inc. 系列:* 零件狀態(tài):在售 標準包裝:1
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