POWERSTEP01, When in external step mode, how does KVAL get calculated for VOLTAGE MODE?

[CBeif.1]

I know that Vout = Vs * Kval

I know that

Kval = [(Kval_x * BEMF_COMP) * VSCOMP * K_THERM]*microstep

In the datasheet KVal_x is either KVAL_ACC, KVAL_DEC, KVAL_RUN, or KVAL_HOLD

depending on the state of the motion planner.

But, I am not using the internal motion planner, I am providing an external

step pin. So how do I control the Kval in this situation?

[Cristiana SCARAMEL]

In Step-clock mode the SPEED register is set to zero and motor status is considered stopped regardless of the STCK signal frequency.

So you need to consider the KVAL_HOLD.

[CBeif.1]

Thanks, Does that also mean BEMF compensation does not work in external STEP MODE?

[Cristiana SCARAMEL]

Acceleration compensation curve is applied when the motor runs.

No BEMF compensation is applied when the motor is stopped as is in fact considered the motor in step-clock mode.