JVC KS-FX742R, Service Manual

Page: 25 / 54

KS-FX742R
(No.49816)1-25
4.5 LC75823W (IC651) : LCD driver
• Pin Layout
• Pin function
Pin No. Symbol I/O Functions
1 to 52 S1 to S52 O Segment output pins used to display data transferred by serial data input.
53 to 55 COM1 to COM3 O Common driver output pins. The frame frequency is given by : t0=(fosc/384)Hz.
56 VDD -- Power supply connection. Provide a voltage of between 4.5 and 6.0V.
57 INH I Display turning off input pin.
INT="L" (Vss) ----- off (S1 to S52, COM1 to COM3="L"
INT="H" (VDD)----- on
Serial data can be transferred in display off mode.
58 VDD1 I Used for applying the LCD drive 2/3 bias voltage externally.
Must be connected to VDD2 when a 1/2 bias drive scheme is used.
59 VDD2 I Used for applying the LCD drive 1/3 bias voltage externally.
Must be connected to VDD1 when a 1/2 bias drive scheme is used.
60 Vss -- Power supply connection. Connect to GND.
61 OSC I/O Oscillator connection.
An oscillator circuit is formed by connecting an external resistor and capacitor at this pin.
62 CE I Serial data interface connection to the controller. CE : Chip enable
63 CL I Serial data interface connection to the controller. CL : Sync clock
64 DI I Serial data interface connection to the controller. DI : Transfer data
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
S14
S15
S16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
S48
S47
S46
S45
S44
S43
S42
S41
S40
S39
S38
S37
S36
S35
S34
S33
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
S17 S18 S19 S20 S21 S22 S23 S24 S25 S26 S27 S28 S29 S30 S31 S32
DI CL CE OSC Vss VDD2 VDD1 INH VDD COM3 COM2 COM1 S52 S51 S50 S49
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