Seiko LTP F Series, Reference Manual

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3-9
3.4.2 Motor Timing
Refer to the time chart in Figure 3-7 when designing the control circuit or software for starting and
stopping the motor. Also, note the following precautions:
Precautions for Designing the Motor Control Circuit and Software
(1) Stop step
z To stop the motor, excite for 10 msec with the same phase as the last one in the
printing step.
(2) Pause state
z In the pause state, do not excite the step motor by having I0, I1 go high so as to prevent
the motor from heating. Even when the step motor is not excited, it maintains force to
prevent the paper from sliding by a torque operation.
(3) Start step
z To restart the motor from the stop step, immediately shift the motor into the print
sequence.
z
To restart the motor from the pause (no excitation) state, shift the motor into the print
step sequence after outputting the same phase as that of the stop step for the first step
time of the acceleration step.
Input signals for a sample drive circuit are shown in Figure 3-7 .
Figure 3-7 Motor Start/Stop Timing
PH1
PH2
I0,I1
H
L
H
L
H
L
Print step Pause
step
Pause
standby
Start
step
Print step