Sanyo AVD-8501, Service Manual

Page: 48 / 110

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IC BLOCK DIAGRAM & DESCRIPTION
IC601 uPD16311GC-AB6 (1/8 to 1/16-Duty FIP(VFD) Controller/Driver
-FRONT SECTION-
6
5
8
9
52
10~13
27~32
35,36
1~4
50 46 14,33,45 51 34
37
44
26
15
D
IN
CLK
STB
OSC
Key
1
to
Key
4
SW
1
to
SW
4
D
OUT
LED
1
LED
5
V
DD
(+5V)
V
SS
(0V)
V
EE
(-30V)
Seg
1
Seg
12
Seg
13
/Grid
16
Seg
20
/Grid
9
Grid
1
Grid
8
OSC
Serial
I/F
Command decoder
Dimming
circuit
Display memory
20 bitx16 word
Timing generator
key scan
Key data
memory (4x12)
5-bit latch
18-bit shift register
20-bit outpur latch
4-bit latch
Segment dr
iv
er
Segment/g
ri
d
dr
iv
er
Gr
id dr
iv
er
Data selector
1
2
3
4
5
6
7
8
9
10
11
12
13
39
38
37
36
35
34
33
32
31
30
29
28
27
51 52 50 49 48 47 46 45 44 43 42 40 41
14 15 16 17 18 19 20 21 22 23 24 26 25
SW
1
SW
2
SW
3
SW
4
D
OUT
D
IN
IC
CLK
STB
KEY
1
KEY
2
KEY
3
KEY
4
Grid
6
Grid
7
Grid
8
Seg
20
/Grid
9
Seg
19
/Grid
10
V
EE
V
DD
Seg
18
/Grid
11
Seg
17
/Grid
12
Seg
16
/Grid
13
Seg
15
/Geig
14
Seg
14
/Grid
15
Seg
13
/Grid
16
OSC V
SS
LED
1
LED
2
LED
3
LED
4
LED
5
V
DD
Gr
id
1
Gr
id
2
Gr
id
3
Gr
id
4
Gr
id
5
V
DD
Seg
1
/KS
1
Seg
2
/KS
2
Seg
3
/KS
3
Seg
4
/KS
4
Seg
5
/KS
5
Seg
6
/KS
6
Seg
7
/KS
7
Seg
8
/KS
8
Seg
9
/KS
9
Seg
10
/KS
10
Seg
11
/KS
11
Seg
12
/KS
12
Pin No. Pin Name Symbol Description
6
5
9
8
52
15 to 26
44 to 37
27 to 32
35 to 36
50 to 46
10 to 13
1 to 4
14,33,45
51
34
7
D
IN
D
OUT
STB
CLK
OSC
Seg
13
/Grid
16
to
Seg
20
/Grid
9
Seg
1
/KS
1
to
Seg
12
/KS
12
Grid
1
to Grid
8
SW
1
to SW
4
Key
1
to Key
4
LED
1
to LED
5
V
DD
V
SS
V
EE
IC
Data input
Data output
Strobe
Clock input
LED output
Key data intput
Switch intput
Logic power
Internally connected
Logic ground
Pull-down level
Oscillator pin
High-voltage output
(segment)
High-voltage output
(segment/grid)
High-voltage output (grid)
Inputs serial data at rising edge of shift clock, starting from lower
bit.
Outputs serial data at falling edge of shift clock, starting from lower
bit. This is N-ch open-drain output pin.
Initializes serial interface at rising or falling edge to make
µ
PD16311 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 initialized.While STB is high, CLK is ignored.
Reads serial data at rising edge, and outputs data at falling edge.
Connect resistor for determining oscillation frequency to this pin.
Segment output pins (Dual function as key source).
Grid output pins.
These pins are selectable for segment or grid output.
CMOS output. +20 mA max.
Data input to these pins is latched at end of display cycle.
These pins constitute 4-bit general-purpose input port.
5V–10%
Connect this pin to GND of system.
V
DD
- 35V max.
Be sure to leave this pin open (this pin is at V
DD
level).