STMicroelectronics FlexSPIN: SPI configurable stepper and DC multi motor driver evaluation board EVAL6460 EVAL6460 Fiche De Données

Doc ID 17713 Rev 1

61/139

   

   

   

Bridges 1, 2, 3 and 4 can be configured to be used two by two (1 plus 2, 3 plus 4) as one 
super bridge thus enabling the driving of loads (motors) requiring high currents. In this 
configuration the half bridges will be paralleled and will work as one phase of the super-
bridge just created: the two phases + will become phase + of the newly created super-
bridge while the two phases - will become phase –.

When this configuration is chosen for bridges 1 (3) and 2 (4), the resulting bridge will use the 
driving logic of bridge 1 (3) so for programming it must be used the bridge 1 (3) control and 
status bits (direction, PWM, ...): i.e. the used PWM signal will be chosen by 
Mtr1SideAPwmSel[1:0] (Mtr3SideAPwmSel[1:0]) bits in SPI.

If the bridges are not configured to be used in parallel, each side of the bridge will use the 
PWM selected by the respective MtrXPWMYSel[1:0] bits in the SPI, but if one of the two 
drivers is configured as a full bridge only one of the two selected PWM will be used to drive 
the motor and this is the PWM chosen for side A.

In order to avoid any problem coming from different propagation times of PWM signals the 
anti-crossover dead times are slightly increased when the bridges are paralleled.

Each bridge can be configured to be used as 2 independent half bridges or as 1 super half 
bridge (see 

). It is also possible to parallel more than one bridge and use all of 

them as a single super half bridge.

 

PH

-

 

PH

+

 

 

PH

+

 

PH

-

 

 

M  

Bridge 2 (4) 

Super Bridge 

Bridge 1 (3) 

 

PH

-

 

PH

+

 

 

PH

+

 

PH

-

 

 

M  

Bridge 2 (4) 

Super Bridge 

Bridge 1 (3) 

 

Parallel Full Bridge