LC75886PW Datasheet, PDF (7/36 Pages) ON Semiconductor – 1/4 and 1/3-Duty LCD Display Driver

LC75886PW
Pin Functions
Handling
Symbol
Pin No.
Function
Active
I/O
when
unused
Segment outputs for displaying the display data transferred by serial data
S1/P1 to S4/P4
79,80,1,2
input. The S1/P1 to S4/P4 pins can be used as general-purpose output ports
-
S5 to S53
3 to 51
under serial data control.
O
OPEN
COM1 to COM3
COM4/S54
52 to 54
55
Common driver outputs.
The frame frequency is fO[Hz].
The COM4/S54 pin can be used as a segment output in 1/3 duty.
-
O
OPEN
Key scan outputs. Although normal key scan timing lines require diodes to
KS1/S55
KS2/S56
KS3 to KS6
be inserted in the timing lines to prevent shorts, since these outputs are
56
unbalanced CMOS transistor outputs, these outputs will not be damaged by
57
-
shorting when these outputs are used to form a key matrix. The KS1/S55
58 to 61
and KS2/S56 pins can be used as segment outputs when so specified by the
O
OPEN
control data.
KI1 to KI5
62 to 66
Key scan inputs.
These pins have built-in pull-down resistors.
H
I
GND
General-purpose output port.
P5/S57
67
This pin can be used as clock output port or segment output port under
-
O
OPEN
serial data control.
Oscillator connections. An oscillator circuit is formed by connecting an
OSC
external resistor and capacitor at this pin. This pin can also be used as the
73
external clock input pin if the external clock operating mode is selected with
-
I/O
VDD
the control data.
CE
76
Serial data interface connections to the controller. Note that DO, being an
H
I
open-drain output, requires a pull-up resistor.
CL
77
CE: Chip enable
I
GND
DI
78
CL: Synchronization clock
DI: Transfer data
DO
75
DO: Output data
-
I
-
O
OPEN
Reset signal input
• RES=Low ····· Display off
- S1/P1 to S4/P4, KS1/S55, KS2/S56=Low
(These pins are forcibly set to the segment output port function and
fixed at the low level.)
- S5 to S53=Low
- COM1 to COM3=Low
- COM4/S54=Low
(This pin is forcibly set to the common output function and fixed at the
low level.)
- P5/S57=Low
(This pin is forcibly set to the general-purpose output port function and
RES
74
fixed at the low level.)
- KS3 to KS6=Low
L
I
VDD
- Key scanning disabled
- All the key data is reset to low.
- OSC=”Z”(High impedance)
- RC oscillation stopped
- Inhibits external clock input
• RES=High ···· Display on
- General-purpose output port state setting is enabled
- Key scanning is enabled.
- RC oscillation enabled (RC oscilltator operating mode)
- Enables external clock input (external clock operating mode)
However, serial data can be transferred when the RES pin is low
TEST
72
This pin must be connected to ground.
-
I
-
VDD1
VDD2
VDD
VSS
69
Used to apply the LCD drive 2/3 bias voltage externally.
70
Used to apply the LCD drive 1/3 bias voltage externally.
68
Power supply connections. Provide a voltage of between 4.5 to 6.0V.
71
Power supply connections. Connect to ground.
-
I
OPEN
-
I
OPEN
-
-
-
-
-
-
No.A1391-7/36