LC75879PT_13 Datasheet, PDF (7/35 Pages) ON Semiconductor – LCD Display Driver

LC75879PT
Pin Functions
Pin
S1/P1 to
S8/P8
S9 to S66
S68
COM1 to COM3
COM4/S67
S69/OSCI
CE
CL
DI
INH
VDD1
VDD2
VDD
VSS
Pin No.
Function
Active
79, 80,
Segment outputs for displaying the display data transferred by serial data
-
1 to 6
input. The S1/P1 to S8/P8 pins can be used as general-purpose output
7 to 64
ports under serial data control.
69
65 to 67 Common driver outputs
-
68
The frame frequency is fo[Hz].
The COM4/S67 pin can be used as a segment output in 1/3 duty.
74
Segment output. This pin can also be used as the external clock input pin
-
when the external clock operating mode is selected by control data.
76
Serial data transfer inputs. Must be connected to the controller.
H
CE: Chip enable
77
CL: Synchronization clock
DI: Transfer data
78
-
75
Display off control input
L
•INH=low(VSS)….Display forced off S1/P1 to S8/P8=low (VSS)
(These pins are forcibly set to the general-purpose output
port function and held at the VSS level.)
S9 to S66,S68=low(VSS)
COM1 to COM3=low(VSS)
COM4/S67=low(VSS)
S69/OSCI=low(VSS)
(This pin is forcibly set to the segment output port function
and held at the VSS level.)
Stops the internal oscillator. Inhibits external clock input.
Display contrast adjustment circuit stopped.
•INH=high(VDD)…Display on
Enables the internal oscillator circuit.
(Internal oscillator operating mode)
Enables external clock input.
(External clock operating mode)
Display contrast adjustment circuit operation is enabled.
However, serial data transfer is possible when the display is forced off.
71
Used to apply the LCD drive 2/3 bias voltage externally.
-
72
Used to apply the LCD drive 1/3 bias voltage externally.
-
70
Power supply pin. A power voltage of 4.5 to 6.3V must be applied to this pin.
-
73
Ground pin. Must be connected to ground.
-
Handling
I/O
when
unused
O
OPEN
O
OPEN
I/O
OPEN
I
GND
I
I
I
GND
I
OPEN
I
OPEN
-
-
-
-
No.A1687-7/35