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