Epson SQ-B50/2550 Technical Manual page 100

REV.-A
• Excitation Signal Send Circuit Section
In a normal stepping motor controller IC, 4-phase data is directly input into the IC, but with the
SLA7020M, special phase data must be input. In the main unit, motor drive control is 2-2 phase only.
Figure 2-31 shows the excitation signal send circuit. The SLA7020M has only one A phase side
excitation signal input. The output is divided into the A phase output and the A phase output that
passes through the converter. For this reason, when the excitation signal input IN goes HIGH, the
A phase output side goes ON, and when input IN is LOW, the A phase output goes ON. The B phase
works in the same way. Figure 2-32 shows the 2-2 phase excitation timing chart.
PhaseA·
Output
INA
PhaseA
Output
I - - - - - - - . - - - - i
Ch
0
pp in 9
_ _...J
Control
Figure 2-31. Excitation Signal Input Circuit
INA
I
Input
Tda
Iput
PhaseA
PhaseA
2 3
4
2 3 4
Figure 2-32. 2-2 Phase Excitation Timing Chart
2-32