Reference Voltage Generation Circuit - Epson LQ-510 Technical Manual

REV.-A

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.
LQ-510
Figure 2-52. Reference Voltage Generation Circuit
Table 2-3. Reference Voltages
PBO PB1
H
H
H
L
L H
H
H
PRINCIPLES OF OPERATION
Reference Voltage
PB2
0.322 V
L
0.267 V
H
0.223
H V
H 0.071 v
2-43