JVC KD-LH7R Service Manual page 31

LC75873NW(IC601):LCD Driver
1.Pin layout
60 41
61 40
80 21
1 20
3.Pin function
Pin name
Pin No.
DIMMER
79
S1/P1 TO S4/P4
80
S5 to S68
1,2,3
to 66
COM1
67
COM2
68
COM3
69
OSC
74
76 CE
77 CL
78 DI
INH
75
VDD1
71
VDD2
72
VDD
70
73 VSS
2.Block diagram
VDD1
COMON
DRIVER
VDD2
INH
CLOCK
OSC
GENERATOR
VDD
VSS
I/O
Dimmer function control output
O
H:Dimmer off
L:Dimmer on
Segment outouts for displaying the display data
transferred by serial data input.
O
The S1/P1 to S4/P4 pins can be used as general-
purpose output ports under serial data control.
Common driver outputs.
O
The frame frequency f0 is given by :
f0 = (FOSC/384)Hz.
Oscillator connection
I/O
An oscillator circuit is formed by connecting an
external resistor and capacitor to this pin.
Serial data transfer inputs.
I
Connected to the controller.
I
CE:Chip enable
I
CL:Synchronization clock
DI:Transfer data
Display off control input
INH= "L"(VSS)
I
INH = "H"(HDD)
However, serial data transfer is possible when
the display is forced off by this pin.
Used for applying the LCD drive 2/3 bias voltage
externally. Must be connected to VDD2 when a
I
1/2 bias drive scheme is used.
Used for applying the LCD drive 1/3 bias voltage
I
externally. Must be connected to VDD1 when a
1/2 bias drive scheme is used.
Power supply connection.
-
Provide a voltage of between 3.0 and 6.0V.
Power supply connection. Connect to ground.
-
SEGMENT DRIVER
SHIFT REGISTOR
ADDRESS
DETECTOR
Description
Display forced off
S1/P1 to S4/P4 = "L"
(These pins are forcibly set to the
segment output port function and held
at the low level.)
S5 to S68 = "L"
COM1 to COM3"L"
Display on
KD-LH7R
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