STMicroelectronics FlexSPIN: SPI configurable stepper and DC multi motor driver evaluation board EVAL6460 EVAL6460 Data Sheet

   

   

   

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 Doc ID 17713 Rev 1

         

The allowable control modes are as follows:

1.

Stepping sequence left to external microcontroller: in this mode the current level in 
each motor winding is set by the microcontroller via the serial interface.

2. 

Full step: in this mode the electrical angle will change by 90° steps at each StepReq 
signal transition. There are two possibilities:

–

Normal step (two phases on): in normal step mode both windings are energized 
simultaneously and the current will be alternately reversed. The resulting electrical 
angles will be 45°, 135°, 225° and 315°.

–

Wave drive (one phase on): In wave drive mode each winding is alternately 
energized and reversed. The resulting electrical angles will be 90°, 180° and 270° 
and 360°.

3. 

Half step: in this mode, one motor winding is energized and then two windings 
alternately so the electrical angles the motor will do when rotating in clockwise direction 
and using the same current limit in both the phases are: 45°, 90°, 135°, 180°, 225°, 
270°, 315° and 360°.

4. 

Microstepping: in this mode the current in each motor winding has a quasi sinusoidal 
profile. The increment between each step is obtained at each transition of StepCmd bit 
in StepCmd register. The difference between each step could be chosen (4, 8 or 16 
levels for each phase) according to following table:

         

When internal stepping sequence generation is used, the stepping direction is set by the 
StepDir bit according to the 

. 

0

StepCmd bit in StepCmd register.

1

GPIO12 input pin.

000 or 111

No Control

Stepping sequence control left to the external 
controller

001

Half Step

Half step

010

Normal Step

Full step (two phases on)

011

Wave Drive

Full step (one phase on)

100

1/4 Step

Four micro steps

101

1/8 Step

Eight micro steps

110

1/16 Step

Sixteen micro steps