lc75804e Sanyo Semiconductor Corporation, lc75804e Datasheet - Page 7

• Manufacturer Part Number: lc75804e
• Description: 1/3, 1/4 Duty Lcd Display Drivers With Key Input Function
• Manufacturer: Sanyo Semiconductor Corporation

Pin Functions
KS3 to KS6
COM4/S74
S9 to S73
KI1 to KI5
S1/P1 to
KS1/S75
KS2/S76
S8/P8
COM1
COM2
COM3
V
V
TEST
V
OSC
RES
V
V
Pin
DO
LCD
LCD
CE
CL
DI
LCD
DD
SS
1
2
LC75804E
11 to 75
3 to 10
82 to 85
86 to 90
79
78
77
76
100
80
81
97
99
98
96
93
94
91
92
95
1
2
Pin No.
LC75804W
9 to 73
80 to 83
84 to 88
1 to 8
77
76
75
74
100
78
79
95
98
99
97
96
94
91
92
89
90
93
Segment outputs for displaying the display data transferred by serial
data input.
The S1/P1 to S8/P8 pins can be used as general-purpose output ports
under serial data control.
Common driver outputs
The frame frequency fo is given by : fo = (f
The COM4/S74 pin can be used as a segment output in 1/3 duty.
Key scan outputs
Although normal key scan timing lines require diodes to be inserted in
the timing lines to prevent shorts, since these outputs are unbalanced
CMOS transistor outputs, these outputs will not be damaged by shorting
when these outputs are used to form a key matrix. The KS1/S75 and
KS2/S76 pins can be used as segment outputs when so specified by
the control data.
Key scan inputs
These pins have built-in pull-down resistors.
Oscillator connection
An oscillator circuit is formed by connecting an external resistor and
capacitor at this pin.
Serial data interface connections to the controller. Note that DO, being
an open-drain output, requires a pull-up resistor.
CE :Chip enable
CL :Synchronization clock
DI :Transfer data
DO :Output data
Reset signal input
RES = low ..... Display off
RES = high .... Display on
However, serial data can be transferred when RES is low.
Used for applying the LCD drive 2/3 bias voltage externally. Must be
connected to V
Used for applying the LCD drive 1/3 bias voltage externally. Must be
connected to V
Logic block power supply connection. Provide a voltage of between 4.5
and 6.0V.
LCD driver block power supply connection. Provide a voltage of
between V
This pin must be connected to ground.
Power supply connection. Connect to ground.
DD
Key scan disabled
All key data is reset to low
Key scan enabled
– 0.5 and 6.0V.
LCD
LCD
LC75804E, LC75804W
2 when a 1/2 bias drive scheme is used.
1 when a 1/2 bias drive scheme is used.
Function
OSC
/384)Hz.
Active
—
—
—
—
—
—
—
—
—
—
—
—
H
H
L
I/O
I/O
—
—
—
O
O
I
I
I
I
I
I
I
I
when unused
No. 6266-7/37
Handling
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
GND
GND
V
V
—
—
—
—
DD
DD