LC75847T Datasheet, PDF (5/27 Pages) Sanyo Semicon Device – 1/3, 1/4 Duty General-Purpose LCD Driver

LC75847T
Pin Functions
Symbol
Pin No.
Function
S1/P1 to S8/P8
S9 to S105
1 to 8 ^{Segment outputs for displaying the display data transferred by serial data input. The}
pins S1/P1 to S8/P8 can be used as general-purpose output ports when so set up by
9 to 105 _{the control data.}
COM1 to COM3
COM4/S106
Common driver outputs.
109 to 107
106 ^{The frame frequency is fO Hz.}
The COM4/S106 pin can be used as a segment output in 1/3 duty.
OSC
Oscillator connection.
116 _{An oscillator circuit is formed by connecting an external resistor and capacitor to this}
pin.
CE
CL
DI
INH
V_LCD0
V_LCD1
118 _{Serial data transfer inputs. These pins are connected to the control microprocessor.}
119 ^{CE: Chip enable}
CL: Synchronization clock
120 ^{DI: Transfer data}
Display off control input
• INH = low (V_SS) ....Off
S1/P1 to S8/P8 = low (V_SS)
(These pins are forcibly set to the segment output port function
and fixed at the V_SS level.)
117
S9 to S105 = low (V_SS)
COM1 to COM3 = low (V_SS)
COM4/S106 = low (V_SS)
• INH = high (V_DD) ..On
Note that serial data transfers can be performed when the display is forced off by this
pin.
LCD drive 3/3 bias voltage (high level) supply. This level can be modified using the
112
display contrast adjustment circuit. However, note that V_LCD0 must be greater than or
equal to 2.7 V. Also, since this IC provides the built-in display contrast adjustment
circuit, applications must not attempt to provide this level from external circuits.
113
LCD drive 2/3 bias voltage (middle level) supply. It is possible to supply the 2/3 V_LCD0
voltage to this pin externally. This pin must be shorted to V_LCD2 if 1/2 bias is used.
V_LCD2
V_DD
V_LCD
V_SS
114
LCD drive 1/3 bias voltage (middle level) supply. It is possible to supply the 1/3 V_LCD0
voltage to this pin externally. This pin must be shorted to V_LCD1 if 1/2 bias is used.
110 Logic block power supply. Provide a voltage in the range 2.7 to 6.0 V.
LCD driver block power supply. When V_LCD0 is between 0.70 V_LCD and 0.95 V_LCD,
111 supply a voltage in the range 4.0 to 6.0 V. When V_LCD0 and V_LCD will be equal, supply
a voltage in the range 2.7 to 6.0 V.
115 Ground pin. Connect to ground.
Active
—
—
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H
—
L
—
—
—
—
—
—
Handling
I/O _{when unused}
O
Open
O
Open
I/O
V_DD
I
I
GND
I
I
GND
O
Open
I
Open
I
Open
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No. 7389-5/27