Seiko Instruments LTP F Series - Manual (Page 30)

3-12
Motor Current Control
The motor driving at a low speed may make noises during motor driving. Change the current value
supplied to the motor so that the noise can be reduced.
The current value supplied can be switched by controlling I0 and I1 as follows.
Table 3-5 Motor Current Value
Motor reference set current Im = Approx. 275 mA
I0 I1 Current Value
LOW LOW Im (Approx. 275mA)
HIGH LOW Im
LOW HIGH Im
HIGH HIGH Im 0mA
In each motor driving step, when the motor step time Tm (ms) is over 2.5 ms, drive the motor 4/10Im
up to the time of Tm-2.5 (ms) and switch it into Im (approx. 275mA).
Drive the motor at Im (approx. 275 mA) if the motor step time Tm (ms) is 2.5 ms or less. It is not
required to switch the current.
When the previous motor step time is 2.5 ms or less, drive the motor at Im (approx. 275 mA). Do not
switch the current even when the motor step time Tm (ms) is more than 2.5 ms.
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