JVC KS-FX722R Service Manual page 11

KS-FX722R
LC75823E (IC651) : LCD Driver
1. Pin Layout & Symbol
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
S1 1
S2 2
S3 3
S4 4
S5 5
S6 6
S7 7
S8 8
S9 9
S10 10
S11 11
S12 12
S13 13
S14 14
S15 15
S16 16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
2. Pin Function
Pin No. Symbol
1 to 52 S1 to S52
53 to 55 COM1 to COM3
56 VDD
57 INH
58 VDDD1
59 VDD2
60 Vss
61 OSC
62 CE
63 CL
64 DI
1-22
I/O
O Segment output pins used to display data transferred
by serial data input.
O Common driver output pins. The frame frequency is given
by : t0=(fosc/384)Hz.
-- Power supply connection. Provide a voltage of between
4.5 and 6.0V.
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.
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.
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.
-- Power supply connection. Connect to GND.
I/O Oscillator connection.
An oscillator circuit is formed by connecting an external
resistor and capacitor at this pin.
Serial data
interface connection
I to the controller.
48 S48
47
S47
46 S46
45 S45
44 S44
43 S43
42
S42
41 S41
40 S40
39 S39
38 S38
37
S37
36 S36
35 S35
34 S34
33 S33
Function
CE : Chip enable
CL : Sync clock
DI : Transfer data