ST7558
H=”1”
Booster stages
The ST7558 incorporates a software configurable voltage multiplier. After reset (RESB), the default voltage multiplier is set
to 2*VDD2. Other voltage multiplier factors are set via the command “Set Booster stages”.
A0
0
D7
0
D6
0
D5
0
D4
0
D3
1
D2
0
D1
PC1
D0
PC0
WR(R/W)
0
Flag
Description
PC1 PC0
0
0
1
1
0
1
0
1
2*voltage multiplier
3*voltage multiplier
4*voltage multiplier
5*voltage multiplier
PC1, PC0
S/W initial Internal register
The 1st Instruction
A0
D7
D6
D5
D4
D3
D2
D1
D0
WR(R/W)
0
0
0
0
0
0
1
1
1
0
The 2nd Instruction
A0
D7
0
D6
0
D5
0
D4
1
D3
0
D2
0
D1
1
D0
0
WR(R/W)
0
0
System Bias
Select LCD bias ratio of the voltage required for driving the LCD.
A0
D7
D6
D5
D4
D3
0
D2
BS2
D1
BS1
D0
BS0
WR(R/W)
0
0
0
0
0
1
BS2
BS1
BS0
0
1
0
1
0
1
0
1
Bias
11
10
9
8
7
6
5
4
Recommend Duty
1:100
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
1:80
1:65/1:68
1:48
1/40:1/34
1/24
1:18/1:16
1:10/1:9/1:8
LCD bias voltage
Symbol
VLCDIN
V1
Bias voltage for 1/8 bias
VLCDIN
7/8 X VLCDIN
6/8 X VLCDIN
Symbol
V3
V4
VSS
Bias voltage for 1/8 bias
2/8 X VLCDIN
1/8 X VLCDIN
VSS
V2
Ver 2.3
31/56
2005/10/05
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
