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VFD DRIVER IC PIN FUNCTION (LC75725E) : IC74
Pin
Pin No.
V
1, 13
Driver block power supply connection. (Both pins must be connected.)
FL
V
60
Logic block power supply connection. Provide a voltage between 4.5 and 5.5 V.
DD
V
57
Power supply connection. Connect to the ground.
SS
OSCI
59
Oscillator connection. An oscillator circuit is formed by connecting an external resistor
and capacitor to these pins.
OSCO
58
Display off control input.
BLK = Low (V
BLK
61
BLK = High (V
Note that serial data can be transferred while the display is turned off.
Serial data transfer inputs. These pins must be connected to the system microcontroller.
CL
63
CL: Synchronization clock
DI
64
DI: Transfer data
CE
62
CE: Chip enable
G1 to G11
2 to 12
Digit outputs. These pins are P-channel open drain outputs with pull-down resistors.
Segment outputs for displaying the display data transferred by serial data input. These pins
S1 to S43
56 to 14
are P-channel open drain outputs with pull-down resistors.
BLOCK DIAGRAM
Function
) ... Display off. (S1 to S43 and G1 to G11 at V
SS
) ... Display on.
DD
I/O
level.)
FL
Handling when unused
—
—
—
—
—
—
I
GND
O
OPEN
I
GND
I
GND
O
OPEN
O
OPEN
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