DRV8426PWPR datasheet(13/49 Pages) TI1

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Table 4. Microstepping Indexer Settings (continued)

MODE0

MODE1

STEP MODE

1/8 step

Hi-Z

1/16 step

Hi-Z

1/32 step

Hi-Z

330k

Ω to

GND

1/64 step

Hi-Z

1/128 step

Hi-Z

1/256 step

Table 5 shows the relative current and step directions for full-step (71% current), 1/2 step, 1/4 step and 1/8 step

operation. Higher microstepping resolutions follow the same pattern. The AOUT current is the sine of the

electrical angle and the BOUT current is the cosine of the electrical angle. Positive current is defined as current

flowing from the xOUT1 pin to the xOUT2 pin while driving.

At each rising edge of the STEP input the indexer travels to the next state in the table. The direction is shown

with the DIR pin logic high. If the DIR pin is logic low, the sequence is reversed.

NOTE

If the step mode is changed on the fly while stepping, the indexer advances to the next

valid state for the new step mode setting at the rising edge of STEP.

The initial excitation state is an electrical angle of 45°, corresponding to 71% of full-scale current in both coils.

This state is entered after power-up, after exiting logic undervoltage lockout, or after exiting sleep mode.

Table 5. Relative Current and Step Directions

1/8 STEP

1/4 STEP

1/2 STEP

FULL

STEP

71%

AOUT CURRENT

(% FULL-SCALE)

BOUT CURRENT

(% FULL-SCALE)

ELECTRICAL

ANGLE

(DEGREES)

100%

0.00

20%

98%

11.25

38%

92%

22.50

56%

83%

33.75

71%

45.00

83%

56%

56.25

92%

38%

67.50

98%

20%

78.75

100%

90.00

98%

-20%

101.25

92%

-38%

112.50

83%

-56%

123.75

71%

-71%

135.00

56%

-83%

146.25

38%

-92%

157.50

20%

-98%

168.75

-100%

180.00

-20%

-98%

191.25

-38%

-92%

202.50

-56%

-83%

213.75

-71%

225.00

-83%

-56%

236.25

-92%

-38%

247.50

-98%

-20%

258.75

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