STK672-050-E

No.5228-10/19

• M1, M2, and M3 (Excitation mode and CLK input edge timing selection)

1) Pin circuit type: Built-in pull-up resistor (20k

Ω, typical) CMOS Schmitt trigger structure

2) Function:

M2

0

0

1

1

M1

M3

0

1

0

1

Phase switching clock edge timing

1

2 phase excitation

1-2 phase excitation

W1-2 phase excitation

2W1-2 phase excitation

Rising edge only

0

1-2 phase excitation

W1-2 phase excitation

2W1-2 phase excitation

4W1-2 phase excitation

Rising and falling edges

3) Valid mode setting timing: Applications must not change the mode in the period 5

μs before or after a CLK signal

rising or falling edge.

Mode Setting Acquisition Timing

• M4 and M5 (Microstepping mode rotation vector locus setting)

M4

1

0

1

0

M5

1

0

0

1

Mode

Circular

1

2

3

See page 10 for details on the current division ratio.

• RESET (Resets all parts of the system.)

1) Pin circuit type: Built-in pull-up resistor (20k

Ω, typical) CMOS Schmitt trigger structure

2) Function:

- All circuit states are set to their initial values by setting the RESET pin low. (Note that the pulse width must be

at least 10

μs.)

At this time, the A and B phases are set to their origin, regardless of the excitation mode. The output current

goes to about 71% after the reset is released.

3) Notes: When power is first applied to this hybrid IC, Vref must be established by applying a reset. Applications

must apply a power on reset when the VCC2 power supply is first applied.

• Vref (Sets the current level used as the reference for constant-current detection.)

1) Pin circuit type: Analog input structure

2) Function:

- Constant-current control can be applied to the motor excitation current at 100% of the rated current by applying a

voltage less than the control system power supply voltage VCC2 minus 2.5V.

- Applications can apply constant-current control proportional to the Vref voltage, with this value of 2.5V as the

upper limit.

Mode switching timing

Excitation counter up/down

CLK input

System clock

Mode setting

M1 to M3

Mode switching clock

Hybrid IC internal setting state

Phase excitation clock

A06851

1

Phase B

Circular

Phase A

2

3

ITF02399