Sequencer value

Phase A

Phase B

Reference voltage

Current direction

Reference

voltage

Current

direction

0

0

X X

X

X

X

X

X

X

A1 → A2

B1 → B2

0

1 X

X

X

X

X

X

X

X

A1 → A2

B1 ← B2

1

0 X

X

X

X

X

X

X

X

A1 ← A2

B1 ← B2

1

1 X

X

X

X

X

X

X

X

A1 ← A2

B1 → B2

When the step mode is different from the full-step mode the values listed in Table 10. Target reference and current

direction according to sequencer value (not full-step mode) are used.

Sequencer value

Phase A

Phase B

Reference voltage

Current

direction

Reference voltage

Current

direction

0 0 0 0 0 0 0 0 0 0

Zero

(power bridge disabled)

-

B1 → B2

0 0

N

A1 → A2

B1 → B2

0 1 0 0 0 0 0 0 0 0

A1 → A2

Zero

(power bridge disabled)

-

0 1

N

Sin(π/2 + N/256 × π/2) ×

A1 → A2

Cos(π/2 + N/256 × π/2) ×

B1 ← B2

1 0 0 0 0 0 0 0 0 0

Zero

(power bridge disabled)

-

B1 ← B2

1 0

N

A1 ← A2

B1 ← B2

1 1 0 0 0 0 0 0 0 0

A1 ← A2

Zero

(power bridge disabled)

-

1 1

N

Sin(π/2 + N/256 × π/2) ×

A1 ← A2

Cos(π/2 + N/256 × π/2) ×

B1 → B2

The following table shows the target reference and sequencer values for 1/2-, 1/4- and 1/8-step operation. Higher

microstepping resolutions follow the same pattern. The reset state (home state) for all stepping mode is entered

at power-up or when the device exits the standby status.

1/2 step

1/4 step

1/8 step

VREF phase A

VREF phase B

Sequencer value

1

1

1

0%

100%

0000000000

home state

2

19.509%

98.079%

0000100000

2

3

38.268%

92.388%

0001000000

4

55.557%

83.147%

0001100000

STSPIN220

Microstepping sequencer

DS11633 - Rev 4

page 11/27