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REV.-A
•
DCU Constant-Current Control
Table 2-3 shows the standard voltage Vref. According to the combination state of DCU (2A) ports
P 1 and P2, the potential ratio combination of resistors R23, R11, R12, and R29 switches, and the
applied standard voltage switches to RF terminals A and B of SLA7020M. The stepping motor is
powered by the current propor-tionalized to Vref voltage. Transistors Q7 and Q8 go ON by port P3
of the XDCU (2A) going LOW. Accordingly, if the Td terminal is ground level, the motor can be stepped
arbitrarily.
Table 2-3. Standard Voltages
P1
P
Standard Voltage
(V:Calculated Value)
H
H
0.054
H
L
0.914
L
H
0.055
H
H
1.268
2-30
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