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VFD Driver/Controller IC
PT6315
PT6315 v2.0
Page 5
Sep. 2002
PIN DESCRIPTION
P i n N a m e
I / O
Description
P i n N o .
L E D 1 t o L E D 4
O
LED Output Pin
1 to 4
OSC
I
Oscillator Input Pin
A resistor is connected to this pin to
determine the oscillation frequency
5
D O U T
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).
6
DIN
(Schmitt Trigger)
I
Data Input Pin
This pin inputs serial data at the rising edge
of the shift clock (starting from the lower
bit)
7
C L K
(Schmitt Trigger)
I
Clock Input Pin
This pin reads serial data at the rising edge
and outputs data at the falling edge.
8
STB
(Schmitt Trigger)
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.
9
K 1 t o K 2
I
K e y D a t a I n p u t P i n s
The data inputted to these pins are latched
at the end of the display cycle.
10 ,11
VSS
-
Logic Ground Pin
12,44
V D D
-
Logic Power Supply
1 3 , 4 3
SG1/KS1 to SG16/KS16
O
High-Voltage Segment Output Pins
A l s o a c t s a s t h e K e y S o u r c e
1 4 t o
29
V E E
-
Pull-Down Level
30
S G 1 7 / G R 1 2 t o S G 2 4 / G R 5
O
High Voltage Segment/Grid Output Pins
31 to
38
G R 4 t o G R 1
O
High-Voltage Grid Output Pins
39 to
42
