Hi Torsten,
What you are seeing is the internal logic being powered down. The datasheet discusses this when exiting sleep:
When exiting sleep mode, the nFAULT pin will be briefly driven active low as the internal power supplies turn on.
nFAULT will return to inactive high once the internal power supplies (including charge pump) have stabilized.
This process takes some time (up to 1 ms), before the motor driver becomes fully operational.
Examining VINT may meet your desire. It is disabled when entering sleep. The time may vary based on the variation of the recommended 2.2uF capacitor.
What you are seeing is the internal logic being powered down. The datasheet discusses this when exiting sleep:
When exiting sleep mode, the nFAULT pin will be briefly driven active low as the internal power supplies turn on.
nFAULT will return to inactive high once the internal power supplies (including charge pump) have stabilized.
This process takes some time (up to 1 ms), before the motor driver becomes fully operational.
Examining VINT may meet your desire. It is disabled when entering sleep. The time may vary based on the variation of the recommended 2.2uF capacitor.