Sanyo DCS-AVD8501 Service Manual page 48

IC BLOCK DIAGRAM & DESCRIPTION
-FRONT SECTION-
IC601 uPD16311GC-AB6 (1/8 to 1/16-Duty FIP(VFD) Controller/Driver
Command decoder
6
D
IN
D 5
OUT
Display memory
Serial
20 bitx16 word
I/F
CLK 8
STB 9
Timing generator
52
OSC OSC
key scan
Key data
memory (4x12)
Key
1
to 10~13
Key
4
5-bit latch
SW
1
1~4
to
SW
4
50
LED
1
Pin No. Symbol
6
5 D
9 STB
8 CLK
52 OSC
15 to 26
Seg
1
Seg
12
44 to 37 Grid
1
27 to 32
Seg /Grid
13
35 to 36 Seg
20
50 to 46 LED
1
10 to 13 Key
1
1 to 4 SW
1
14,33,45 V
51 V
34 V
7
Dimming
circuit
46 14,33,45 51
LED V V
5 DD SS
(+5V) (0V)
Pin Name
D Data input
IN
Data output
OUT
Strobe
Clock input
Oscillator pin
High-voltage output
/KS to
1
(segment)
/KS
12
to Grid High-voltage output (grid)
8
to High-voltage output
16
/Grid (segment/grid)
9
to LED
LED output
5
to Key
4 Key data intput
to SW Switch intput
4
Logic power
DD
Logic ground
SS
Pull-down level
EE
IC Internally connected
15 Seg
1 SW
SW
SW
SW
26 Seg
12
D
OUT
D
Seg /Grid
27~32
13 16
CLK
STB
Seg /Grid
35,36
20 9
KEY
KEY
KEY
44 Grid
1
KEY
37
Grid
8
34
V
EE
(-30V)
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
µPD16311 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 - 35V max.
DD
Be sure to leave this pin open (this pin is at V
- 63 -
52 51 50 49 48 47 46 45 44 43 42
1
1
2
2
3
3
4
4
5
6
IN
IC 7
8
9
10
1
11
2
12
3
13
4
14 15 16 17 18 19 20 21 22 23 24
Description
DD
41 40
39 Grid
6
Grid
38
7
Grid
37
8
Seg /Grid
36
20 9
35 Seg /Grid
19 10
V
34
EE
33 V
DD
32 Seg /Grid
18 11
31 Seg /Grid
17 12
30 Seg /Grid
16 13
29 Seg /Geig
15 14
28 Seg /Grid
14 15
27 Seg /Grid
13 16
25 26
level).