ST7522 Sitronix, ST7522 Datasheet - Page 27

• Manufacturer Part Number: ST7522
• Description: 17 x 96 Dot Matrix LCD Controller
• Manufacturer: Sitronix

ST7522
This command makes it possible to adjust the brightness of the liquid crystal display by controlling the liquid crystal drive voltage
V5. This command is a two byte command used as a pair with the electronic volume mode set command and the electronic
volume register set command, and both commands must be issued one after the other. That command can operate in master
chip for master + slave mode.
When this command is input, the electronic volume register set command becomes enabled. Once the electronic volume mode
has been set, no other command except for the electronic volume register command can be used. Once the electronic
volume register set command has been used to set data into the register, then the electronic volume mode is released.
By using this command to set six bits of data to the electronic volume register, the liquid crystal drive voltage V
the 64 voltage levels.
When this command is input, the electronic volume mode is released after the electronic volume register has been set.
Default value=“35H”
The Electronic Volume Register Set Sequence
Ver 1.0c
A0
A0
0
0
The Electronic Volume (Double Byte Command)
The Electronic Volume Mode Set
Electronic Volume Register Set
―
―
RD
RD
1
1
WR
WR
―
―
0
0
D7
0
0
0
D6
0
0
0
D7
D7
1
0
NO
D5
0
0
1
Electronic volumn register set
D6
D6
Electronic volumn mode set
0
0
D4
0
0
1
.
.
.
.
complete
D5
D5
0
Change
D3
0
0
1
27/45
D2
D4
D4
YES
0
0
1
0
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Electronic volume
D1
0
0
1
D3
D3
0
D0
0
1
1
D2
D2
0
V5 level
Large
Small
D1
D1
.
.
.
.
.
.
0
D0
D0
1
5
assumes one of
2002/07/10
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