Tao_2199,
I believe the phenomenon is a device feature that reduces the reverse current during deceleration. For whatever reason, this feature isn't highlighted in the datasheet for TPIC2060.
I think that if the customer is changing VSPM from a high value to a lower value, the TPIC2060 considers the motor to be decelerating, so it sets all outputs to Hi-Z. During Hi-Z, the BEMF creates a current that dissipates the rotational energy in the body diodes and the parasitic resistance to slow the motor. This should last for about 26 ms, which I believe you said the customer observed.
Is your customer happy with the workaround of setting REG0x6B to 0x04 to eliminate this phenomenon?
I believe the phenomenon is a device feature that reduces the reverse current during deceleration. For whatever reason, this feature isn't highlighted in the datasheet for TPIC2060.
I think that if the customer is changing VSPM from a high value to a lower value, the TPIC2060 considers the motor to be decelerating, so it sets all outputs to Hi-Z. During Hi-Z, the BEMF creates a current that dissipates the rotational energy in the body diodes and the parasitic resistance to slow the motor. This should last for about 26 ms, which I believe you said the customer observed.
Is your customer happy with the workaround of setting REG0x6B to 0x04 to eliminate this phenomenon?