LC75857E Datasheet, PDF (7/39 Pages) Sanyo Semicon Device – CMOS IC 1/3, 1/4 Duty LCD Display Drivers with Key Input Function

LC75857E, LC75857W
Pin Functions
Pin
Pin No.
Function
Active
S1/P1 to
Segment outputs for displaying the display data transferred by serial data input.
S4/P4
1 to 4
The S1/P1 to S4/P4 pins can be used as general-purpose output ports under serial
—
S5 to S38
5 to 38 data control.
COM1
Common driver outputs
to
COM3
42 to 40
The frame frequency is fo [Hz]
The COM4/S39 pin can be used as a segment output in 1/3 duty.
—
COM4/S39
39
Key scan outputs
KS1/S40
43
Although normal key scan timing lines require diodes to be inserted in the timing lines
KS2/S41
44
to prevent shorts, since these outputs are unbalanced CMOS transistor outputs, these
—
KS3/S42
45
outputs will not be damaged by shorting when these outputs are used to form a key
KS4 to KS6 46 to 48 matrix. The KS1/S40 to KS3/S42 pins can be used as segment outputs when so
specified by the control data.
KI1 to KI5
OSC
CE
CL
DI
DO
TEST
V_LCD1
V_LCD2
V_DD
V_LCD
V_SS
Key scan inputs
49 to 53 _{These pins have built-in pull-down resistors.}
H
The OSC pin can be used to form an oscillator circuit with an external resistor and an
60
external capacitor. If external clock mode is selected with the control data, this pin is
—
used to input an external clock signal.
62
Serial data interface connections to the controller. Note that DO, being an open-drain
H
output, requires a pull-up resistor.
63
CE :Chip enable
64
CL :Synchronization clock
—
DI :Transfer data
61
DO :Output data
—
59
This pin must be connected to ground.
—
Used for applying the LCD drive 2/3 bias voltage externally. Must be connected to
56
V_LCD2 when a 1/2 bias drive scheme is used.
—
Used for applying the LCD drive 1/3 bias voltage externally. Must be connected to
57
V_LCD1 when a 1/2 bias drive scheme is used.
—
54
Logic block power supply connection. Provide a voltage of between 2.7 and 6.0V.
—
LCD driver block power supply connection. A voltage in the range 0.75 × VDD to 6.0 V
55
must be provided when VDD is in the range 3.6 to 6.0 V, and a voltage in the range
—
2.7 V to 6.0 V must be provided when VDD is in the range 2.7 to 3.6 V.
58
Power supply connection. Connect to ground.
—
I/O
Handling
when unused
O
OPEN
O
OPEN
O
OPEN
I
GND
I/O
V_DD
I
I
GND
I
O
OPEN
I
—
I
OPEN
I
OPEN
—
—
—
—
—
—
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