ST7781
11.1.14 Power Control 3 (R12h)
Power Control 3 (R12h)
D1
5
D1
4
D1
3
D1
2
D1
D1
RS
/WR
/RD
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
1
0
VCIR
VRH
VRH
VRH
VRH
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
↑
1
E
1
3
0
2
0
1
0
0
0
Default value
VCIRE: Select the external reference voltage VDD or internal reference voltage VCIR.
When VCIRE=”0” using external reference voltage
When VCIRE=”1” using internal reference voltage 2.5V
VRH [3:0]:Set the amplifying rate (1.6 ~ 2.4) of VDD applied to output the GVDD level, which is a reference level for
the VCOM level and the grayscale voltage level.
VCIRE=0
GVDD
VCIRE=1
GVDD
VRH[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
VRH[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Halt
Halt
2.5V X 2
VDDX 2.00
VDDX 2.05
VDDX 2.10
VDDX 2.20
VDDX 2.30
VDDX 2.40
VDDX 2.40
VDDX 1.60
VDDX 1.65
VDDX 1.70
VDDX 1.75
VDDX 1.80
VDDX 1.85
VDDX 1.90
VDDX 1.95
2.5V X 2.05
2.5V X 2.1
2.5V X 2.2
2.5V X 2.3
2.5V X 2.4
2.5V X 2.4
2.5V X 1.6
2.5V X1.65
2.5V X 1.7
2.5V X 1.75
2.5V X 1.8
2.5V X 1.85
2.5V X 1.9
2.5V X 1.95
Description
Note1: When VDD<2.5V, internal reference voltage will be same as VCI.
Note2: Make sure VDD >= 2.6V, when using VCIRE =1.
Note3: Make sure that VC and VRH setting restriction: GVDD <=(AVDD-0.5)V
Ver. 1.7
56
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