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    參數(shù)資料
    型號: M38005M1-XXXHP
    廠商: Mitsubishi Electric Corporation
    元件分類: DC/DC變換器
    英文描述: 1 watt dc-dc converters
    中文描述: 1瓦的DC - DC轉(zhuǎn)換器
    文件頁數(shù): 126/173頁
    文件大?。?/td> 4203K
    代理商: M38005M1-XXXHP
    3800 GROUP USER’S MANUAL
    3-24
    APPENDIX
    3.4 Countermeasures against noise
    3.4 Countermeasures against noise
    Countermeasures against noise are described below. The following countermeasures are effective against noise in
    theory, however, it is necessary not only to take measures as follows but to evaluate before actual use.
    3.4.1 Shortest wiring length
    The wiring on a printed circuit board can be as an antenna which feeds noise into the microcomputer.
    The shorter the total wiring length (by mm unit), the less the possibility of noise insertion into a microcomputer.
    (1) Wiring for the RESET pin
    Make the length of wiring which is connected to the RESET pin as short as possible. Especially, connect a capacitor
    across the RESET pin and the V
    SS
    pin with the shortest possible wiring (within 20mm).
    Reason
    The reset works to initialize a microcomputer.
    The width of a pulse input into the RESET pin is determined by the timing necessary conditions. If noise having
    a shorter pulse width than the standard is input to the RESET pin, the reset is released before the internal state
    of the microcomputer is completely initialized. This may cause a program runaway.
    Fig. 3.4.1 Wiring for the RESET pin
    (2) Wiring for clock input/output pins
    G
    Make the length of wiring which is connected to clock I/O pins as short as possible.
    G
    Make the length of wiring (within 20mm) across the grounding lead of a capacitor which is connected to an
    oscillatorand the V
    SS
    pin of a microcomputer as short as possible.
    G
    Separate the V
    SS
    pattern only for oscillation from other V
    SS
    patterns.
    Reason
    A microcomputer's operation synchronizes with a clock generated by the oscillator (circuit). If noise enters clock
    I/O pins, clock waveforms may be deformed. This may cause a malfunction or program runaway.
    Also, if a potential difference is caused by the noise between the V
    SS
    level of a microcomputer and the V
    SS
    level
    of an oscillator, the correct clock will not be input in the microcomputer.
    RESET
    Reset
    circuit
    Noise
    V
    SS
    V
    SS
    Reset
    circuit
    V
    SS
    RESET
    V
    SS
    3800 group
    3800 group
    N.G.
    O.K.
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