The tmc idx 7505 is a very small power end stage for stepper motors with phase currents of up to 7 a peak or 5 a rms control is through stroke and direction signals opto decoupled 5 24 v in order to prevent unnecessary overheating of the motor a dynamic current matching facility with standby current reduction is used to provide the motor with only as much current as is necessary parameterisation of the idx 7505 is performed over the rs 485 interface with an ascii protocol on a pc fo