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    controller not wark proper in power on

    Hello All;
    I have Ned help in given Schematic control program properly every time but in power on controller not wark, every alternet time wark power on,
    What his problem.
    I am assemble 35 Qty PCB only 5 PCB Wark every time power on remening 30 PCB have same problem;

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    Re: controller not wark proper in power on

    Just telling us “they don’t work” is meaningless. Do they explode? Do they make strange noises? Give us SOMETHING. Maybe it’s your reset circuit. Maybe not.



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    Re: controller not wark proper in power on

    Every Power ON Bi color LED is Blink but in this 30 QTY PCB alternate time wark

    - - - Updated - - -

    Every Power ON Bi color LED is Blink but in this 30 QTY PCB alternate time wark.
    continuous every alternate time will be wark.



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    Re: controller not wark proper in power on

    Maybe not a good idea to share the same crystal between two ICs, try disconnecting the OSC output from U6 or you have two conflicting outputs connected together. Ideally, use two crystals.

    What does R54 do? The -INT pin is an open-drain output from U6 and seems not to be used anyway. I would remove R54 and make R53 100K if you are worried about leaving the pin floating.

    I'm not familiar with the STM32L422CBT6 but I would consider adding a diode across R33 to speed up discharge of C19 when power is removed.

    Brian.
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    Re: controller not wark proper in power on

    Hello;
    I am sum experiment NRST Circuit not proper work, But change value R33 1K to 2M Resistor and Capacitor 1nF to 1uF issue not solve
    Any one sages me what was do



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    Re: controller not wark proper in power on

    Power no reset problem in PCB



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    Re: controller not wark proper in power on

    hello all;
    Decoupling capacitor of controller used 100nF but in controller datasheet 1uf and 10nF this capacitor required analog VDD Supply


    Thank you



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    Re: controller not wark proper in power on

    I don't think this is a reset signal timing or power supply problem. By paralleling two oscillator circuits you run the risk of them randomly not starting and at best not being efficient.

    Brian.
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    Re: controller not wark proper in power on

    but i have used controller internal RTC U6 IC not mount only provision



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