njw4351 New Japan Radio Co.,Ltd, njw4351 Datasheet - Page 11

• Manufacturer Part Number: njw4351
• Description: Unipolar Stepper Motor Driver
• Manufacturer: New Japan Radio Co.,Ltd

combined with a pulse generator.
limit, which is a common problem with unipolar winding systems. It simplifies the design of power control circuits
during phase turn-off.
unchanged even if logic supply voltage applied to it varies. It produces hesteresis voltage for noise immunity. Input
Block2 (PD, DIR, HSM, RESET, ENABLE) has Schmitt Inverter for the main purpose of noise immunity.
FUNCTION DESCRIPTION
LOGIC INPUT BLOCK
The NJW4351 is designed for a high-performance constant-voltage unipolar stepper motor.
Using a general-purpose STEP&DIR motion controller, the device can easily control a stepper motor when
The maximum value of the phase output is 55 V that keeps the voltage margin of the motor from exceeding the
All inputs are LS-TTL compatible. Input Block1 (STEP) has Schmitt Comparator to keep the thresh voltage
Inputs are internally connected to GND by pull-down resistances, being open, the device recognizes to be low.
• STEP – Stepping Pulse
stepper motor at the basic step angle. In half step mode, two pulses are required to turn the motor at the basic
step angle.
be established before the start of the positive edge.
• DIR – Direction
NJW4351 is connected to the motor. DIR can be modified anytime, it miss-steps when it is simultaneous with the
positive edge.
• HSM – Half/full Step Mode Switching
half step mode when HSM is low. Like DIR, HSM can be modified anytime but not when its simultaneous with
the positive edge.
• ENABLE – Phase Output Off
• RESET
four of the basic step. The Translator is repeated every four pulses in full step mode and every eight pulses in
half step mode.
• PD-Power Down
The Translator starts counting on every positive edge of the STEP. In full step mode, the pulse turns the
The DIR (direction) signal and HSM (half/full mode) are latched to the STEP positive edge and must therefore
The DIR signal determines the step direction. The direction of the stepper motor depends on how the
This signal determines whether the stepper motor runs at half step or full step mode. The Translator is set to
All phase outputs are turned off when ENABLE goes high reducing power consumption.
A two-phase stepper motor repeats the same winding energizing sequence every angle that is a multiple of
When RESET is low, the Translator is initialized and the phase outputs turn-off.
When returning to high, the phase outputs are set to the initial energizing pattern output status.
When PD goes low, it forces all settings to initialize and be in stand-by mode.
AND MO is to be low.
NJW4351
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