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why the fault output of TMC6200 is pulsed waveform instead of high (continuous)?

Category: Hardware
Product Number: TMC6200

We are using TMC6200 driver IC for motor control to run the Permanent Magnet Synchronous motor. PWM pulses are generated from Digital signal processor. after running for some time we are getting this kind of waveform (as attached). But when we try to read the fault registers few times we are getting the flag - under voltage for charge pump but some times there is no fault. Let us know in what condition fault pin shows this kind of signal.