SSD1730 Solomon, SSD1730 Datasheet - Page 14

• Manufacturer Part Number: SSD1730
• Description: SSD1730 MLA Power Chip CMOS
• Manufacturer: Solomon

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VDD_PWR
11. EXPLANATION OF FUNCTIONS
This SSD1730 is a power chip for operating four-line MLA LCD drivers. It consists of a CMOS charge pump-type
voltage generator which can produce all of the bias voltages for a four-line MLA driven. SSD1730 power chip can
be used as a voltage generator to a display system formed by column driver such as SSD1870 and row driver such
as SSD1881. In SSD1730, all output voltages are generated or reference from supply power VDD_PWR. The volt-
age levels at 5X or 6X step-up mode can be calculated by the logical formulas that are summarized in Table 14.
Where is a variable and it must greater than or equal to 0 (
SOLOMON
+V1=-(-V1)
=4 x (VDD_PWR-VSS) -
V3=VDD_PWR-VSS
V2=0.5 x (VDD_PWR-VSS)
VC=VSS
-V2=-0.5 x (VDD_PWR-VSS)
-V3=-V3B=-(VDD_PWR-VSS)
VEM=-2 x (VDD_PWR-VSS)
VDD_ROW=-3 x (VDD_PWR-
VSS) +
-V1=-4 x (VDD_PWR-VSS) +
VEE=-4 x (VDD_PWR-VSS)
VSS
Logical Formula
Figure 5 - Voltage levels relationship between power chip, column driver and row driver
SSD1730
Power Chip
External
components
VDD_ROW
VDD_PWR
5X Step-up Mode
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VSS
VEE
+V1
-V2
-V3
-V1
V2
Table 14 - Logical formula for SSD1730 (VSS = 0.0V)
(VDD_PWR=3.3V)
Voltage Level
-13.2 +
13.2 -
-9.9 +
-1.65
-13.2
1.65
-3.3
-6.6
3.3
0.0
V3
V2
VSS
-V2
-V3
SSD1870
Column Driver
. In practice, it represents contrast adjustment value.
+V1=-(-V1)
=5 x (VDD_PWR-VSS) -
V3=VDD_PWR-VSS
V2=0.5 x (VDD_PWR-VSS)
VC=VSS
-V2=-0.5 x (VDD_PWR-VSS)
-V3=-V3B=-(VDD_PWR-VSS)
VEM=-3 x (VDD_PWR-VSS)
VDD_ROW=-4 x (VDD_PWR-
VSS) +
-V1=-5 x (VDD_PWR-VSS) +
VEE=-5 x (VDD_PWR-VSS)
Logical Formula
Rev 2.0
04/2002
+V1
VC
VDD_ROW
-V1
SSD1881
Row Driver
6X Step-up Mode
SSD1730
(VDD_PWR=3.3V)
Voltage Level
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-13.2 +
-16.5 +
16.5 -
-1.65
-16.5
1.65
-3.3
-9.9
3.3
0.0
12
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