NT7502H-BDT Ver la hoja de datos (PDF) - Novatek Microelectronics
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NT7502H-BDT Datasheet PDF : 54 Pages
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NT7502
The Power Supply Circuit
The power supply circuits are low-power consumption power supply circuits that generate the voltage levels required for the
liquid crystal drivers. They comprise Booster circuits, voltage regulator circuits, and voltage follower circuits. They are only
enabled in master operation.
The power supply circuits can turn the Booster circuits, the voltage regulator circuits, and the voltage follower circuits ON or
OFF independently through the use of the Power Control Set command. Consequently, it is possible to make an external power
supply and the internal power supply function somewhat in parallel. Table 7 shows the Power Control Set Command 3-bit data
control function, and Table 8 shows reference combinations.
Table. 8 The Control Details of Each Bit of the Power Control Set Command
Item
D2 Booster circuit control bit
D1 Voltage regulator circuit (V regulator circuit) control bit
D0 Voltage follower circuit (V/F circuit) control bit
Status
“1”
“0”
ON OFF
ON OFF
ON OFF
Table. 9
Use Settings
D2 D1 D0
Step-up
circuit
1.Only the internal power supply
is used
1 11
O
2.Only the V regulator circuit and
the V/F circuit are used
0
1
1
X
3.Only the V/F circuit is used
0 01
X
4.Only the external power supply
is used
0
0
0
X
Voltage
regulator
circuit
V/F circuit
External
voltage input
O
O
VDD2
O
O
VOUT, VDD2
X
O
V0, VDD2
X
X
V0 to V4
Step-up
voltage
system
terminal
Used
Open
Open
Open
*The “step-up system terminals” refer CAP1+, CAP1-, CAP2+, CAP2-and CAP3+.
*While other combinations, not shown above, are also possible, these combinations are not recommended because they have
no practical use.
The Step-up Voltage Circuits
Using the step-up voltage circuits within the NT7502 chips it is possible to product 4X, 3X, 2X step-ups of the VDD2-VSS voltage
levels
17
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