Occurring malfunction case in use of DRV8880

  Dear Motor Driver support team,

 I operate two-phase stepping motor by the driver of DRV8880 with the supply voltage of 24V and 2A full scale current at full step mode.

I changed DIR signal at every 2400 pulse of STEP signal as shown in Fig1.

When the DIR signal is Hi (CCW), I always confirmed normal rotation of the stepping motor motion and observing control signals shown in Fig.2.

Meanwhile, I often confirmed irregular stepping motor motion(the motor can not rotate but looks like trembling) at DIR signal is Low (CW) with observing the abnormal AOUT1/2 signals shown in Fig.3.

Please inform me what is the problem on my operation of the driver and how to solve it.

Sincerely yours,

Yohjiro Kawai,

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