MCF8329A: Motor driver power supply current pulses in idle mode.

Tool/software:

Hi there,

I am designing a board with MCF8329A. When I look with a current probe on the power supply line I see current pulses with frequency around 1.6 kHz (slightly jittering) and amplitude abovef 300 mA without any motor connected/running. This is the same with my custom board and with the standard demo board that I bought initially from TI. I an sending a screen shot from my oscilloscope for reference.

Can you let me know what is creating this behavior and how I can influence the frequency and amplitude of those current pulses, please?

With kind regards,

Alexander.