DRV8350: DIfferent charge pump configuration

In our design the capacitor  1µF is connected to VCP-Pin 4 and th other side  to PIN 2 VM instead to Pin 4 VDRAIN. THE result is the distortion with the 4 distortion pulses, which are described in

"Internal charge pump generate spikes (distortion)in the power distribution". With a rework we changed the connection from the capacitor to Pin 2 VM to the connection as defined in the data sheet to Pin 4 VDRAIN. THe result is that the four distortion pulses  were eliminated, but we have now ground jumps on the plane. Currently we have not found a way how to eliminate the groud jumps.  We can say that these ground jumps comming from the motor driver (charge pump).

Note in the previouse configuration where the capacitor was connected to VM pIN 2, we had a common mode choke, which had split  the ground between Power GND and GND_IO (digital Ground). WE find out, that when we short  POwer GND With GND_IO at the common mode shoke, the four distortions are gone.

TO understand the charge pump inside the motor driver, it is helpful to get more details about the internal realization of the motor driver.

i asked me, what happened when the capacitor at VCP -PIN is connected to VM instead to Vdrain. Is that a configuration which TI can accept ?

THANK you to all.

Norbert