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LC75818PT Folha de dados(PDF) 9 Page - ON Semiconductor

Nome de Peças LC75818PT
Descrição Electrónicos  1/8 to 1/10 Duty Dot Matrix LCD Display Controllers/Drivers
Download  43 Pages
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Fabricante Electrônico  ONSEMI [ON Semiconductor]
Página de início  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

LC75818PT Folha de dados(HTML) 9 Page - ON Semiconductor

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LC75818PT
No.A0964-9/43
Continued from preceding page.
Pin
Pin No.
Function
Active
I/O
Handling
when unused
VLCD3
111
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.
-
I
OPEN
VLCD4
112
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.
-
I
GND
VDD
106
Logic block power supply connection. Provide a voltage of
between 2.7to 3.6V.
-
-
-
VLCD
107
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.
-
-
-
VSS
113
Power supply connection. Connect to ground.
-
-
-
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, 5×8, or 5×9 dot matrix character patterns using CGROM or CGRAM.) DCRAM has a capacity of
64
×8 bits, and can hold 64 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
14
15
16
DCRAM address (hexadecimal)
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
However, when the display shift is performed by specifying MDATA, the DCRAM address shifts as shown below.
Display digit
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
DCRAM address (hexadecimal)
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
10
(shift left)
Display digit
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
DCRAM address (hexadecimal)
3F
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
(shift right)
Note: *3. The DCRAM address is expressed in hexadecimal.
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
Most significant bit
MSB
Least significant bit
LSB


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