Read Sharp HT-CN410DVH (serv.man2) Service Manual online
HT-CN410DVH
64
IC251, VFD Driver (PT6311)
Pin Description:
Pin Name
I/O
Function
Pin No.
SW1 to SW4
I
General Purpose Input pins
1 to 4
DOUT
O
Data Output Pin (N-Channel, Open-Drain)
This pin outputs serial data at the falling edge of the shift clock (starting from the
lower bit)
This pin outputs serial data at the falling edge of the shift clock (starting from the
lower bit)
5
DIN
I
Data Input Pin
This pin inputs serial data at the rising edge of the shift clock
(starting from the lower bit)
This pin inputs serial data at the rising edge of the shift clock
(starting from the lower bit)
6
NC
-
No Connection
7
CLK
I
Clock Input pin
This pin reads serial data at the rising edge and
outputs data at the falling edge.
This pin reads serial data at the rising edge and
outputs data at the falling edge.
8
STB
I
Serial Interface Strobe pin
The data input after the STB has fallen is
processed as a command.
When this pin is “HIGH”, CLK is ignored.
The data input after the STB has fallen is
processed as a command.
When this pin is “HIGH”, CLK is ignored.
9
K1 to K4
I
Key Data Input Pins
The data inputted to these pins are latched at
the end of the display cycle.
The data inputted to these pins are latched at
the end of the display cycle.
10 to 13
VDD
-
Logic Power Supply
14, 33, 45
SG1/KS1 to SG12/KS12
O
High-Voltage Segment Output Pins
Also acts as the Key Source
Also acts as the Key Source
15 to 26
SG20/GR9 to SG19/GR10
SG18/GR11 to SG13/GR16
O
High Voltage Segment / Grid Output Pins
36 to 35
32 to 27
32 to 27
VEE
-
Pull-Down Level
34
GR1 to GR8
O
High- Voltage Grid Output Pins
44 to 37
LED1 to LED5
O
LED Output Pin
50 to 46
GND
-
Ground Pin
51
OSC
I
Oscillator Input Pin
A resistor is connected to this pin to determine
the oscillation frequency
A resistor is connected to this pin to determine
the oscillation frequency
52
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