NJW4351 데이터 시트보기 (PDF) - Japan Radio Corporation

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NJW4351

Unipolar Stepper Motor Driver

Japan Radio Corporation  

NJW4351

FUNCTION DESCRIPTION

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

combined with a pulse generator.

The maximum value of the phase output is 55 V that keeps the voltage margin of the motor from exceeding the

limit, which is a common problem with unipolar winding systems. It simplifies the design of power control circuits

during phase turn-off.

LOGIC INPUT BLOCK

All inputs are LS-TTL compatible. Input Block1 (STEP) has Schmitt Comparator to keep the thresh voltage

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.

Inputs are internally connected to GND by pull-down resistances, being open, the device recognizes to be low.

• STEP – Stepping Pulse

The Translator starts counting on every positive edge of the STEP. In full step mode, the pulse turns the

stepper motor at the basic step angle. In half step mode, two pulses are required to turn the motor at the basic

step angle.

The DIR (direction) signal and HSM (half/full mode) are latched to the STEP positive edge and must therefore

be established before the start of the positive edge.

• DIR – Direction

The DIR signal determines the step direction. The direction of the stepper motor depends on how the

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

This signal determines whether the stepper motor runs at half step or full step mode. The Translator is set to

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

All phase outputs are turned off when ENABLE goes high reducing power consumption.

• RESET

A two-phase stepper motor repeats the same winding energizing sequence every angle that is a multiple of

four of the basic step. The Translator is repeated every four pulses in full step mode and every eight pulses in

half step mode.

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.

• PD-Power Down

When PD goes low, it forces all settings to initialize and be in stand-by mode.

AND MO is to be low.

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