Sanyo DC-TS780 Service Manual page 26

IC BLOCK DIAGRAM & DESCRIPTION
IC601 MPD16315GB-3BS(VFD Driver)
DIN 7
Serial
DOUT 6
Data
CLK 8
Interface
STB 9
OSC 5 OSC
LED1 1
LED
2
LED2
Driver
3
LED3
LED4 4
LED1 to LED4
(Schmitt Trigger)
(Schmitt Trigger)
(Schmitt Trigger)
SG1/KS1 to SG16/KS16
SG17/GR12 to SG24/GR5
GR4 to GR1
Control
Display Memory
(24 bits x 17 Words)
TI~inc Generator
Key Moter Memory
10 11
K1 K2
Pin Name I/O
O
OSC I
Data Output Pin (N-Channel, Open-Drain)
DOUT O
cdge of the shift clock (starting from the lower bit)
DIN
I This pin inputs serial data at the rising cdge
of the shift clock (starting from the lower bit)
CLK I This pin reads serial data at the rising cdge
STB The data input after the STB has fallen is
I
K1 to K2 I The data inputted to these pins are fatched
VSS -
VDD -
O
VEE -
O
O
Driving Circuit
13 30
VDD GND VEE
Description
LED Output Pin
Oscillator Input Pin
A resistor is connected to this pin to
determinc the oscillation frequency
This pin outputs scrial data at the falling
Data Input Pin
Clock Input Pin
and outputs data at the falling cdge.
Serial Interface Strobe Pin
processed as a command.
When this pin "HIGH",CLK is ignored,
Key Data Input Pins
at the end of the display cycle.
Logic Ground Pin
Logic Power Supply
High-Voltage Segment Output Pins
Also acts as the Key Source
Pull-Down Level
High Voltage Segment/Grid Output Pins
High-Voltage Grid Output Pins
- 25 -
14 SG1/KS1
15 SG2/KS2
16 SG3/KS3
17 SG4/KS4
18
SG5/KS5
19 SG6/KS6
20 SG7/KS7
Segment
Driver
21
SG8/KS8
22
SG9/KS9
Grid
23
Driver SG10/KS10
24 SG11/KS11
Key Scan
25 SG12/KS12
Output
26
SG13/KS13
27
SG14/KS14
28
SG15/KS15
30
SG16/KS16
31 SG17/GR12
32
SG18/GR11
33
SG19/GR10
34
SG20/GR9
35 SG21/GR8
36
SG22/GR7
37 SG23/GR6
38
SG24/GR5
42 GR1
41
GR2
Grid
Driver
40 GR3
GR4
39
Pin No.
1 to 4
5
6
7
8
9
10, 11
12, 44
13, 43
14 to 29
30
31 to 38
39 to 42