SAMHOP Microelectronics Corp.
VFD CONTROLLER / DRIVER
SM6311
PIN DESCRIPTION
SYMBOL
S1 to S4
D
OUT
D
IN
GND
CLK
STB
K1 to K4
V
DD
Sg1/KS1~
Sg12/KS12
Sg12/G16~
Sg20/G9
V
EE
G1~G8
LED1~LED5
OSC
PIN NAME
Switch Input
Data Output
Data Input
Logic Ground
Clock Input
Strobe
Key data input
Logic Power
Segment/Key
Segment/Grid
Pull Down
Level
Grid
LED Output
Oscillator Pin
PIN NO.
1 to 4
5
6
7,51
8
9
10 to 13
14, 33, 45
15 to 26
27 to 32
35 to 36
34
37 to 44
46 to 50
52
FUNCITON DESCRIPTION
4 bit general-purpose input port.
Outputs serial data at falling edge of shift clock,
starting from lower bit.
Input serial data at rising edge of shift clock,
starting from lower bit.
Connect this pin to GND of system.
Reads serial data at rising edge, and outputs
data at falling edge.
While STB is low, Data is valid; while STB is
high, CLK is ignored.
Data input to these pins is latched at end of
display cycle.
5V+10%.
Segment output pins (Dual function as key
source).
These pins are selectable for segment or grid
output.
V
DD
-35V max.
Grid output pins
CMOS output. +20 mA max.
Connect resistor for determining oscillation
frequency to this pin.
Page 3
V.1.2, MAY,2003
SAMHOP [ SAMHOP MICROELECTRONICS CORP. ]
