Epson LQ-510 - Reference Voltage Generation Circuit

REV.-A
PRINCIPLES OF OPERATION
Reference Voltage Generation Circuit
Figure 2-52 shows the reference voltage generation circuit, and Table 2-3 shows the reference voltages.
The SLA7020M drives the stepper motor based on current proportional to the reference voltages set here.
There are four stages of reference voltage values (motor drive current values), and these are switched to
correspond to the drive speed of the motor.
Figure 2-52. Reference Voltage Generation Circuit
PBO
H
H
L
H
Table 2-3. Reference Voltages
PB1
PB2
Reference Voltage
H L
0.322 V
L H 0.267 V
H H 0.223 V
H H 0.071 v
LQ-510
2-43