NT7502 datasheet(4/54 Pages) ETC1

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NT7502

Pad Description

Power Supply

Pad No.

Symbol

I/O

Descriptions

30 - 33

VDD

Supply

2.4 - 3.5V power supply input. These pads must be connected each other

10, 16, 26, 53, 71,

77, 81, 91

VDD

Supply

2.4 - 3.5V power supply output for pad option

34 - 36

VDD2

Supply

This is the reference power supply for the step-up voltage circuit for the LCD.

These pads must be connected each other

37 - 40

VSS

Supply

Ground. These pads must be connected each other

7, 13, 25, 29 , 56,

69 - 70, 74, 79, 83

VSS

Supply

Ground output for pad option

65 - 66

57 - 58

59 - 60

61 - 62

63 - 64

Supply

LCD driver supply voltages. The voltage determined by LCD cell is

impedance-converted by a resistive driver or an operation amplifier for

application. Voltages should be according to the following relationship:

≥ V1 ≥ V2 ≥ V3 ≥ V4 ≥ VSS

When the on-chip operating power circuit is on, the following voltages

are supplied to V1 to V4 by the on-chip power circuit. Voltage selection is

performed by the Set LCD Bias command.

LCD bias

1/5 bias

4/5V0

3/5V0

2/5V0

1/5V0

1/6 bias

5/6V0

4/6V0

2/6V0

1/6V0

1/7 bias

6/7V0

5/7V0

2/7V0

1/7V0

1/8 bias

7/8V0

6/8V0

2/8V0

1/8V0

1/9 bias

8/9V0

7/9V0

2/9V0

1/9V0

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