njw4350 New Japan Radio Co.,Ltd, njw4350 Datasheet - Page 5

• Manufacturer Part Number: njw4350
• Description: Njw4350 Unipolar Stepper Motor Driver
• Manufacturer: New Japan Radio Co.,Ltd

Function description
Logic input
winding.
combined with a pulse generator.
being exceeded, which is a common problem with unipolar winding systems and also simplifies the design of
power control circuits during phase turn off.
level. The NJW4350 has built-in phase logic for optimum control of the stepping motor.
STEP – Stepping pulse
DIR – direction
HSM – half/full step mode switching
The NJW4350 is a high-performance low-voltage driver system for driving stepping motors with unipolar
Employing a general-purpose STEP&DIR motion controller, it can easily control a stepping motor when
The phase output is as high as 55 V max. This prevents the phase output voltage margin of the motor from
All inputs are LS-TT compatible. When the logic input is open, the circuit recognizes any open logic inputs as H
mode, the pulse turns the stepping motor at the basic step angle. In half step mode, two pulses are required to
turn the motor at the basic step angle.
therefore be established before the start of the negative edge. Note the setup time ts in Figure 3.
NJW4350 is connected to the motor. Although DIR can be modified this should be avoided since a misstep of
1 pulse increment may occur if it is set simultaneous with the negative edge. See the timing chart in Figure 3.
logic is set to the half step mode when HSM is low level. Although HSM can be modified this should be
avoided since a misstep of 1 pulse increment may occur if it is set simultaneous with the negative edge. See
the timing chart in Figure 3.
OPTIONAL SENSOR
The built-in phase logic sequencer goes UP on every negative edge of the STEP signal (pulse). In full step
The DIR (direction) signal and HSM (half/full mode) are latched to the STEP negative edge and must
The DIR signal determines the step direction. The direction of the stepping motor depends on how the
This signal determines whether the stepping motor turns at half step or full step mode. The built-in phase
VM
GND(VDD)
IO Device
5V
NORMAL/INHBIT
CMOS
HALF/FULL
CW/CCW
GND
RESET
STEP
MO
STEP
DIR
HSM
RESET
INH
SGND
NJW4350
Fig.4 Application Circuit
VDD
C 10ƒΚF
-
GND(VMM)
PGND
PA2
PB2
PB1
PA1
NJW4350
R1
MOTOR
D1-D4
Nihon Inter Ele.
11DF2or31DF2
R2
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