Kenwood KDV-MP4339 Service Manual page 16

KDV-3241Y/MP4339
/MP4439/MP5032
OILNRPY004B (FRONT UNIT IC901)
• BLOCK DIAGRAM
• PIN DESCRIPTION
Pin No. Pin Name
1 ~ 12 SG1/P1 ~ SG12/P12
13 ~ 51 SG13 ~ SG51
52 ~55 COM1 ~ COM4
56 VDD
57 VDD1
58 VDD2
59 VSS
60 OSC
61 INH
62 CE
63 CLK
64 DI
16
CIRCUIT DESCRIPTION
COM1 COM2 COM3 COM4
V DD1
COMMON
DRIVE R
V DD2
/INH
CLOCK
OS C
GEN ERATOR
V DD
VSS
I/O
O Segment Driver Output/General Purpose Output Ports
O Segment Driver Output Pins
O Common Driver Output Pins
- Power Supply
Power Supply.
- This pin is used to apply a 2/3 LCD Drive Bias Voltage.
If the 1/2 Bias Drive Technique is used, this pin must be short to VDD2.
Power Supply.
- This pin is used to apply a 1/3 LCD Drive Bias Voltage.
If the 1/2 Bias Drive Technique is used, this pin must be short to VDD1.
- Ground
I/O Oscillation Input / Output Pin
Display OFF Control Pin.
If this pin is set to "LOW" (VSS), the display is forced to turn OFF. Output driver pins -- SG1/P1 to
I
SG12/P12, SG13 to SG51, COM1 to COM4 are set to "LOW". If this pin is set to "HIGH" (VDD), the
display is turned ON. (see Note)
I Chip Enable Pin
I Clock Input Pin
I Data Input Pin
S G51 S G50 S G 13 S G12/P12
SE GME NT DR IV ER & LATCH
S HIFT REGIST ER
ADD RESS
DETECTOR
D I CLK CE
Pin Description
SG2/P2 SG1/P1