NT7702 데이터 시트보기 (PDF) - Novatek Microelectronics

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NT7702

240 Output LCD Segment/Common Driver

Novatek Microelectronics 

NT7702

7. Precaution

Be careful when connecting or disconnecting the power

This LSI has a high-voltage LCD driver, so it may be permanently damaged by a high current, which may occar, if a voltage is

supplied to the LCD driver power supply while the logic system power supply is floating.

The details are as follows:

! When connecting the power supply, connect the LCD driver power after connecting the logic system power. Furthermore,

when disconnecting the power, disconnect the logic system power after disconnecting the LCD driver power.

! We recommend that you connect a serial resistor (50-100 Ω) or fuse to the LCD driver power V0 of the system as a current

limiting device. Also, set a suitable value of the resistor in consideration of LCD display grade.

In addition, when connecting the logic power supply, the logic condition of this LSI inside is insecure. Therefore connect the

LCD driver power supply after resetting the logic condition of this LSI inside to DISPOFF function. After that, the

DISPOFF cancel the function after the LCD driver power supply has become stable. Furthermore, when disconnecting the

power, set the LCD driver output pins to level V5 on the DISPOFF function. After that, disconnect the logic system power after

disconnecting the LCD driver power.

When connecting the power supply, follow the recommended sequence shown.

VDD

VDD

VSS

VDD

DISPOFF VSS

V0

V0

VSS

18

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