LC75838E Datasheet, PDF (7/32 Pages) Sanyo Semicon Device – 1/8 to 1/10 Duty General-Purpose LCD Display Drivers

LC75838E, 75838W
Pin Functions
Pin
Pin No.
Function
S1 to S38
S39/COM10
S40/COM9
COM1 to COM8
P1 to P3
OSC
CE
CL
DI
1 to 38
39
40
48 to 41
49 to 51
60
62
63
64
Segment driver outputs.
The S39/COM10 and S40/COM9 pins can be used as common
driver outputs under the control data DT1, DT2.
Common driver outputs.
General-purpose output ports.
Oscillator connection.
An oscillator circuit is formed by connecting an external resistor and capacitor at this
pin.
Serial data transfer inputs.
These pins are connected to the microcontroller.
CE :Chip enable
CL :Synchronization clock
DI :Transfer data
Input that turns the display off and forces the general-purpose output ports low.
• When INH is low (V_SS)
• Display off
S1 to S38 = “L” (V_LCD4).
S39/COM10, S40/COM9 = “L” (V_LCD4)
COM1 to COM8 = “L” (V_LCD4).
INH
61
• General-purpose output ports P1 to P3 = low (V_SS)
• When INH is high (V_DD)
• Display on
• The states of the general-purpose output ports can be set by the PC1 to
PC3 control data.
However, serial data can be transferred when the INH pin is low.
Active
—
—
—
—
H
v
—
L
V_LCD0
V_LCD1
V_LCD2
V_LCD3
LCD drive 4/4 bias voltage (high level) supply pin. The level on this pin can be changed
by the display contrast adjustment circuit.
54
However, (V_LCD0 – V_LCD4) must be greater than or equal to 4.5 V. Also,external power
—
must not be applied to this pin since the pin circuit includes the display contrast
adjustment circuit.
LCD drive 3/4 bias voltage (middle level) supply pin. This pin can be used to supply
55
the 3/4 (V_LCD0 – V_LCD4) voltage level externally.
—
LCD drive 2/4 bias voltage (middle level) supply pin. This pin can be used to supply
56
the 2/4 (V_LCD0 – V_LCD4) voltage level externally.
—
LCD drive 1/4 bias voltage (middle level) supply pin. This pin can be used to supply
57
the 1/4 (V_LCD0 – V_LCD4) voltage level externally.
—
I/O
Handling
when unused
q
Open
q
Open
q
Open
I/O
V_DD
I
I
GND
I
I
GND
O
Open
I
Open
I
Open
I
Open
V_LCD4
LCD drive 0/4 bias voltage (low level) supply pin. Fine adjustment of the display
58
contrast can be implemented by connecting an external variable resistor to this pin.
However, (V_LCD0 – V_LCD4) must be greater than or equal to 4.5 V, and V_LCD4 must be
—
I
in the range 0 V to 1.5 V, inclusive.
GND
V_DD
52
Logic block power supply connection. Provide a voltage of between 2.7 and 6.0V.
—
—
—
LCD driver block power supply connection. Provide a voltage of between 7.0 and 11.0 V
V_LCD
53
when the display contrast adjustment circuit is used and provide a voltage of between
—
—
—
4.5 and 11.0 V when the circuit is not used.
V_SS
59
Power supply connection. Connect to ground.
—
—
—
No. 6902-7/39