Sanyo DVD-SL33 Service Manual page 18

IC BLOCK DIAGRAM & DESCRIPTION
IC201 TL431(REGULATOR)
(Top view)
Cathode Anode Reference
1 2 3
IC501 TP6312F(VFD DRIVE)
D 6
IN
D 5
OUT
CLK 8
STB 9
OSC 44
Key1
to
10~13
Key4
SW1
to
1~4
SW4
Pin No
6
5
9
8
44
15 to 20 Seg
21 to 25 Seg
37 to 32 Grid
26,28 to Seg
31 Seg
42 to 39 LED
10 to 13 KEY
1 to 4 SW
14,38
7,43
27
SO8
(Top view)
8 7 6
1 2 3
Command decoder
Display memory
Serial I/F
16bit x 11 word
Timing generator key
OSC
scan
Key data memory
(4x6)
4
4 bit latch
4
42~39
LED ~LED
1 4
Symbol Pin Name
D Data input Input serial data at rising edge of shift clock,startong from
IN
the lower bit.
D Data output Outputs serial data at falling edge of shift clock,starting
OUT
from the lower bit. This is N-ch open-drain output pit.
STB Strobe Initializes the serial interface at rising or falling edge to
make TP6312E waiting for reception of command.
Data input after STB has fallen is processed as command.
While command data is processed,current processing is
stopped,and serial interface is initialzed.
While STB is high,CLK is ignored.
CLK Clock input Reads serial data at rising edge,and outputs data at
falling edge.
OSC Oscillator pin Connect a resistor to this pin to determine the oscillation
frequency to this pin.
/KS to High-voltage output Segment output pins
1 1
Seg /KS (Dual function as key source)
6 6
to Seg High-voltage output Segment output pins
7 11
(segment)
to Grid High-voltage output Grid output pins
1 6
(grid)
/Grid to High-voltage output These pins are selectable for segment or grid driving.
11 11
/Grid (segment/grid)
16 7
to LED LED output CMOS output. +20 mA max
1 4
to KEY Key data input Data input to these pins is latched at the end of display
1 4
cycle.
to SW Switch input These pins constitute 4-bit general-purpose input port.
1 4
V Logic power 5V – 10%
DD
V Logic ground Connect this pin to system GND.
SS
V Pull-down level V
EE
5
1- Cathode
2- Anode 2-
3- Anode.
4- N.C.
5- N.C.
6- Anode
7- Anode.
8- Reference
4
Dimming circuit
16 11
15~25
5
5
28~31
5
11 6
37~32
14,38 7,43 27
V V V
DD SS EE
(+5V) (0V) (-30V)
Description
-35V max
DD
- 17 -
Seg
1
to
Seg
11
Seg /Gird
12 11
26,
to
Seg /Gird
16 7
Grid
1
to
Grid
6