LC75838W Datasheet, PDF (7/36 Pages) ON Semiconductor – Duty General-Purpose LCD Driver

LC75838W
Pin Functions
Symbol
S1 to S38
S39/COM10
S40/COM9
COM1 to
COM8
P1 to P3
Pin No.
Function
1 to 38
39
40
48 to 41
49 to 51
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.
Handling
Active I/O
when
unused
-
O
OPEN
-
O
OPEN
-
O
OPEN
OSC
CE
CL
DI
INH
VLCD0
VLCD1
VLCD2
VLCD3
VLCD4
Oscillator connection.
60
An oscillator circuit is formed by connecting an external resistor and capacitor at
this pin.
-
I/O
VDD
62
Serial data transfer inputs.
These pins are connected to the microcontroller.
H
I
63
CE: Chip enable
I
GND
CL: Synchronization clock
64
DI: Transfer data
-
I
Input that turns the display off and forces the general-purpose output ports low.
• When INH is low (VSS)
• Display off
S1 to S38 = “L” (VLCD4).
S39/COM10, S40/COM9 = “L” (VLCD4)
61
COM1 to COM8 = “L” (VLCD4).
• General-purpose output ports P1 to P3 = low (VSS)
• When INH is high (VDD)
• Display on
L
I
GND
• 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.
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, (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
-
O
OPEN
contrast adjustment circuit.
LCD drive 3/4 bias voltage (middle level) supply pin. This pin can be used to supply
55
-
the 3/4 (VLCD0 - VLCD4) voltage level externally.
I
OPEN
LCD drive 2/4 bias voltage (middle level) supply pin. This pin can be used to supply
56
-
the 2/4 (VLCD0 - VLCD4) voltage level externally.
I
OPEN
LCD drive 1/4 bias voltage (middle level) supply pin. This pin can be used to supply
57
-
the 1/4 (VLCD0 - VLCD4) voltage level externally.
I
OPEN
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.
58
-
However, (VLCD0 – VLCD4) must be greater than or equal to 4.5V, and VLCD4
must be in the range 0V to 1.5V, inclusive.
I
GND
VDD
VLCD
VSS
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
53
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.
59
Power supply connection. Connect to ground.
-
-
-
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