LC75812PT Datasheet, PDF (9/54 Pages) Sanyo Semicon Device – 1/8, 1/9 Duty Dot Matrix LCD Display Controllers/Drivers with Key Input Function

Continued from preceding page.
Pin
Pin No.
VLCD3
91
VLCD4
92
VDD
86
VLCD
87
VSS
93
LC75812PT
Function
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 0V to 1.5V, inclusive.
Logic block power supply connection. Provide a voltage of
between 2.7 to 3.6V.
LCD driver block power supply connection. Provide a voltage of
between 7.0 to 10.0V when the display contrast adjustment circuit
is used and provide a voltage of between 4.5 to 10.0V when the
circuit is not used.
Power supply connection. Connect to ground.
Active
-
-
-
-
-
Handling
I/O
when unused
I
OPEN
I
GND
-
-
-
-
-
-
Block Functions
• AC (address counter)
AC is a counter that provides the addresses used for DCRAM and ADRAM.
The address is automatically modified internally, and the LCD display state is retained.
• DCRAM (data control RAM)
DCRAM is RAM that is used to store display data expressed as 8-bit character codes. (These character codes are
converted to 5×7 or 5×8 dot matrix character patterns using CGROM or CGRAM.) DCRAM has a capacity of
52×8 bits, and can hold 52 characters. The table below lists the correspondence between the 6-bit DCRAM address
loaded into AC and the display position on the LCD panel.
• When the DCRAM address loaded into AC is 00H.
Display digit
1
2
3
4
5
6
7
8
9 10 11 12 13
DCRAM address (hexadecimal) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C
However, when the display shift is performed by specifying MDATA, the DCRAM address shifts as shown below.
Display digit
DCRAM address (hexadecimal)
1
2
3
4
5
6
7
8
9 10 11 12 13
01 02 03 04 05 06 07 08 09 0A 0B 0C 0D
(shift left)
Display digit
1
2
3
4
5
6
7
8
9 10 11 12 13
(shift right)
DCRAM address (hexadecimal) 33 00 01 02 03 04 05 06 07 08 09 0A 0B
Note: *3. The DCRAM address is expressed in hexadecimal.
Least significant bit
↓
LSB
Most significant bit
↓
MSB
DCRAM address
DA0 DA1 DA2 DA3 DA4 DA5
Hexadecimal
Hexadecimal
Example: When the DCRAM address is 2EH.
DA0
DA1
DA2
DA3
DA4
DA5
0
1
1
1
0
1
Note: *4. 5×7 dots • • • • • 13th digit display 5×7 dots
5×8 dots • • • • • 13th digit display 4×8 dots
No.A1417-9/54