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The problem of  flash data rewriting after IC S9S12ZVL does  unpowered ESD

Question asked by Pete Pan on May 25, 2020
Latest reply on Jun 2, 2020 by Pete Pan

    IC S9S12ZVL32FOMLF LQFP-48 does unpowered ESD,the Flash data is rewritten,The data is shown in the figure below,red is abnormal code, green is normal code, all are read from IC.

    After the circuit board is powered on for about 10 minutes, the PWM output waveform of one channel of the IC is abnormal.

    Why Unpowered ESD causes this phenomenon? Can flash not be rewritten through software enhancement.