ML9445 Datasheet, PDF (65/84 Pages) List of Unclassifed Manufacturers – 180-Channel LCD Driver with Built-in RAM for LCD Dot Matrix Displays

FEDL9445-02
ML9445
Electronic Potentiometer (2-byte command)
This command is used for controlling the LCD drive voltage V1 output by the voltage adjustment circuit of the
internal LCD power supply and for adjusting the intensity of the LCD display. This is a two-byte command
consisting of the Electronic potentiometer mode set command and the Electronic potentiometer register set
command, both of which should always be issued successively as a pair.
• Electronic potentiometer mode set (Write)
When this command is issued, the electronic potentiometer register set command becomes effective.
Once the electronic potentiometer mode is set, it is not possible to issue any command other than the Electronic
potentiometer register set command. This condition is released after data has been set in the register using the
Electronic potentiometer register set command.
A0
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
1
0
0
0
0
0
0
1
• Electronic potentiometer register set (Write)
By setting a 7-bit data in the electronic potentiometer register using this command, it is possible to set the LCD
drive voltage V1 to one of the 128 voltage levels.
The electronic potentiometer mode is released after some data has been set in the electronic potentiometer register
using this command.
α
⊿V
A0 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
127
0
0
0
0
0
0
0
0
0
126
0
0
0
0
0
0
0
0
1
125
0
0
0
0
0
0
0
1
0
124
small
0
0
0
0
0
0
0
1
1
1
0
0
1
1
1
1
1
1
0
0
0
0
1
1
1
1
1
1
1
127
0
1
0
0
0
0
0
0
0
126
0
1
0
0
0
0
0
0
1
125
0
1
0
0
0
0
0
1
0
124
large
0
1
0
0
0
0
0
1
1
1
0
1
1
1
1
1
1
1
0
0
0
1
1
1
1
1
1
1
1
Sequence of setting the electronic potentiometer register:
Electronic potentiometer mode set
Electronic potentiometer register set
The electronic potentiometer mode is released
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