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AENC_DECODER_COUNT_N not triggering

Category: Hardware
Product Number: TMC4671

Can't get N-pulse to trigger on TMC4671. Signal level on N-pulse is between 1V (untriggered) to 4V (triggered). Trying to change the threshold value (AENC_DECODER_N_THRESHOLD) has no effect, the pulse count AENC_DECODER_COUNT_N doesn't change from zero.

Thanks in advance for your help!