POWERSTEP01TR datasheet(62/92 Pages) STMICROELECTRONICS

Part #	POWERSTEP01TR

Description	System-in-package integrating microstepping controller and 10 A power MOSFETs

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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62 / 92 page

Programming manual

powerSTEP01

62/92

DocID025022 Rev 5

STEP_SEL selects one of eight possible stepping modes:

Every time the step mode changes, the electrical position (i.e.: the point of microstepping

sinewave that is generated) resets at the first microstep.

It is important to note that every time STEP_SEL changes, the value in ABS_POS register

loses meaning and then it should be reset.

When sync clock is disabled, BUSY/SYNC output is used as BUSY (command state

machine busy signaling), otherwise BUSY/SYNC output provides a clock signal according

to SYNC_SEL parameter.

Any attempt to write to the register, when the motor is running, causes the command to be

ignored and the CMD_ERROR to rise (see Section 11.1.28 on page 71).

Table 29. Step mode selection

STEP_SEL[2 … 0]

Step mode (CM_VM = 0)

Step mode (CM_VM = 1)

000

Full-step

0

1

Half-step

0

1

0

1/4 microstep

0

1

1/8 microstep

1

0

1/16 microstep

1

0

1

1/32 microstep

1/16 microstep

1

0

1/64 microstep

1/16 microstep

1

1/128 microstep

1/16 microstep

Table 30. Sync clock enable

SYNC_EN

Sync clock

0

Disabled

1

Enabled

Table 31. Sync clock selection

SYNC_SEL[2 … 0]

Step information (CM_VM = 0)

Step information (CM_VM = 1)

0

Full-step

0

1

Half-step

0

1

0

1/4 microstep

0

1

1/8 microstep

1

0

1/16 microstep

1

0

1

1/32 microstep

Always low

1

0

1/64 microstep

Always low

1

1/128 microstep

Always low

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