NPM AD1431 User Manual page 7

Stepper Motor Driver AD1431
*1 Auto current down
Auto current down is a function to prevent heat generation by adjusting to set lower current after pulse
signals stop.
This driver allows to lower the current to 25%, 50% and 75% of the normal current to drive the motor.
*2 One pulse mode and two pulse mode
One pulse mode
It is a method that the rotation direction CW/CCW is decided by whether the DIR photocoupler is
ON or OFF when pulses are input to the CLK terminal.
In the case that CLK(+) and
DIR(+) are connected to +5V.
CLK(-)
DIR(-)
Rotation
direction
Two pulse mode
It is a method that the rotation direction CW/CCW is decided by whether the pulse is input to the
CW terminal or that CCW terminal.
In the case that CW(+) and
CCW(+) are connected to +5V.
CW(-)
CCW(-)
Rotation
direction
- 5 -
Longer Longer
than than
1 μs 1 μs
CW Motor stops
rotation
Longer than 2 μs
CW Motor stops
rotation
CCW Motor stops
rotation
CCW Motor stops
rotation
YA7179-1/2
+5V
CLK(+)
CLK(-)
OFF
ON
DIR(+)
DIR(-)
OFF
AD1431
ON
+5V
CW(+)
CW(-)
OFF
ON
CCW(+)
CCW(-)
OFF
ON AD1431