LC75843UGA
www.onsemi.com
7
Pin Functions
Symbol Pin No. Function Active
I/O
Handling
when unused
S1/P1 to S4/P4
S5 to S24
S28
1 to 4
5 to 24
29
Segment outputs for displaying the display data transferred by serial data
input. The S1/P1 to S4/P4 pins can be used as general-purpose output ports
under serial data control.
- O OPEN
COM1
COM2/S27
COM3/S26
COM4/S25
28
27
26
25
Common driver outputs
The frame frequency is fo[Hz].
The COM2/S27 to COM4/S25 pin can be used as a segment output by control
data.
- O OPEN
OSCI 32
This is input pin for the external clock.
Input the clock at external clock operating mode.
Furthermore, connect to GND at internal oscillator operating mode.
- I GND
CE 34
Serial data transfer inputs. Must be connected to the controller.
CE : Chip enable
CL : Synchronization clock
DI : Transfer data
H I
CL 35
I GND
DI 36 - I
INH
33
Display off control input
•
INH
=low(V
SS
)….Display forced off
S1/P1 to S4/P4=low (V
SS
)
(These pins are forcibly set to the general-purpose output
port function and held at the V
SS
level.)
S5 to S24, S28=low(V
SS
)
COM1=low(V
SS
)
COM2/S27 to COM4/S25=low(V
SS
)
Stops the internal oscillator.
Inhibits external clock input.
•
INH
=high(V
DD
)…Display on
Enables the internal oscillator circuit.
(Internal oscillator operating mode)
Enables external clock input.
(External clock operating mode)
However, serial data transfer is possible when the display is forced off.
L I GND
V
DD
30 Power supply pin. A power voltage of 4.5 to 6.3 V must be applied to this pin. - - -
V
SS
31 Ground pin. Must be connected to ground. - - -
