LC75808W Datasheet, PDF (6/38 Pages) Sanyo Semicon Device – LCD Display Driver with Key Input Function

Pin Functions
Symbol
Pin No.
S1 to S60
COM1 to
COM10
1 to 60
70 to 61
KS1 to KS6
71 to 76
KI1 to KI5
P1 to P4
OSC
CE
CL
DI
DO
77 to 81
82 to 85
95
98
99
100
97
INH
96
TEST
94
VLCD0
88
VLCD1
89
VLCD2
90
VLCD3
91
VLCD4
92
VDD
86
VLCD
87
VSS
93
LC75808W
Segment driver outputs.
Common driver outputs.
Function
Handling
Active I/O
when
unused
-
O
OPEN
-
O
OPEN
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.
Key scan inputs.
H
These pins have built-in pull-down resistors.
General-purpose output ports.
-
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-
H
drain output, requires a pull-up resistor.
CE: Chip enable
CL: Synchronization clock
-
DI: Transfer data
DO: Output data
-
Input that turns the display off, disables key scanning, and forces the
general-purpose output ports low.
• When INH is low (VSS):
• Display off
S1 to S60 = “L” (VLCD4).
COM1 to COM10 = “L” (VLCD4).
• General-purpose output ports P1 to P4 = low (VSS)
• Key scanning is disabled: KS1 to KS6 = low (VSS)
L
• All the key data is reset to low.
• When INH is high (VDD):
• Display on
• The states of the general-purpose output ports can be set by the PC1 to PC4
control data.
• Key scanning is enabled.
However, serial data can be transferred when the INH pin is low.
This pin must be connected to ground.
-
LCD drive 4/4 bias voltage (high level) supply pin. The level on this pin can be
changed by the display contrast adjustment circuit.
However, (VLCD0 - VLCD4) must be greater than or equal to 4.5V.
-
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 the 3/4 (VLCD0 - VLCD4) voltage level externally.
-
LCD drive 2/4 bias voltage (middle level) supply pin. This pin can be used to
-
supply the 2/4 (VLCD0 - VLCD4) voltage level externally.
LCD drive 1/4 bias voltage (middle level) supply pin. This pin can be used to
-
supply the 1/4 (VLCD0 - VLCD4) voltage level externally.
LCD drive 0/4 bias voltage (low level) supply pin. Fine adjustment of the display
contrast can be implemented by connecting an external variable resistor to this pin.
-
However, (VLCD0 - VLCD4) must be greater than or equal to 4.5V, and VLCD4
must be in the range 0 V to 1.5V, inclusive.
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 7.0 and
11.0V when the display contrast adjustment circuit is used and provide a voltage of
-
between 4.5 and 11.0V when the circuit is not used.
Power supply connection. Connect to ground.
-
O
OPEN
I
GND
O
OPEN
I/O
VDD
I
I
GND
I
O
OPEN
I
VDD
I
-
O
OPEN
I
OPEN
I
OPEN
I
OPEN
I
GND
-
-
-
-
-
-
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