Epson Stylus C110 - Motor Driver Circuit

EPSON Stylus C110/C120/D120 Revision B
OPERATING PRINCIPLE Electrical Circuit Operating Principles 39
2.3.2.3 Motor Driver Circuit
CR/PF MOTOR DRIVE CIRCUIT
The motor driver IC (IC5) on the main board drives CR/PF motors. The both motors
are DC motor and are controlled by constant current PWM drive method.
Based on the output pulse (signal) from the CR encoder or PF encoder, the CPU (IC8)
sets the appropriate drive voltage for the current operation and outputs the value as a
special control signal to the motor driver (IC5). Then, based on the signal output from
the CPU, the motor driver applies the corresponding motor drive voltage to the CR/PF
motor.
When no data has been received for 5 minutes, the CPU sets the motor driver voltage to
0, and turn the motor driver Off to save power.
Figure 2-21. Motor Driver Circuit Block Diagram
CPU
(IC8)
Motor driver
(IC5)
SCLK1_DCMCU
SDATA1_DCMCU
SLD1_DCMCU
SCLK2_DCMCU
SDATA2_DCMCU
SLD2_DCMCU
ENB1_DCMCU
ENB2_DCMCU
CLK4M
RST_DCMCU
C15
B14
C14
A15
A14
B15
D16
A16
D14
C16
OUT1A
OUT1B
OUT2A
OUT2B
VOUT1
SW1
FB1
VOUT2
SW2
FB2
SENSE1
SENSE2
SENSE3
SENSE4
GND
GND
GND
GND
44
47
42
39
29
30
28
33
32
34
45
41
20
16
7
18
27
43
VDD
VBB1
VBB2
VBB3
VBB4
CLK1
DATA1
STB1
CLK2
DATA2
STB2
VREF1
VREF2
VREF3
ENB1
ENB2
OSC
SLEEP
VBBSW
VCP
CP1
CP2
GATEREG
9
46
40
21
15
1
3
2
12
10
11
5
6
8
48
13
36
35
31
26
24
25
37
1
2
CR-A
CR-B
1
2
PF-A
PF-B
CN8
CN9
CR Motor
+5V
+1.5V
+1.5V_BS
+3.3V+42V+3.3V
+42V
PF Motor