STMicroelectronics Fully integrated stepper motor driver mounting the L6472 in a high power PowerSO package EVAL6472PD EVAL6472PD Fiche De Données

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On exiting standby mode the bridges are disabled (HiZ flag high) and whichever motion 
command causes the device to exit High Z state (HardStop and SoftStop included).

The SW input is internally pulled-up to V

DD 

and detects if the pin is open or connected to 

ground (see 

The SW_F bit of the STATUS register indicates if the switch is open (‘0’) or closed (‘1’) (see 

); the bit value is refreshed at every system clock cycle (125 ns). 

The SW_EVN flag of the STATUS register is raised when a switch turn-on event (SW input 
falling edge) is detected (see 

). A GetStatus command releases the SW_EVN 

flag (see 

).

By default a switch turn-on event causes a HardStop interrupt (SW_MODE bit of the 
CONFIG register set to ‘0’). Otherwise (SW_MODE bit of the CONFIG register set to ‘1’), 
switch input events do not cause interrupts and the switch status information is at the user’s 
disposal (see 

).

The switch input can be used by the GoUntil and ReleaseSW commands as described in 

 and 

If the SW input is not used, it should be connected to VDD.

Using the POW_SR parameter in the CONFIG register, it is possible to set the commutation 
speed of the power bridge output (see 

).