NT7701H-TABF3 데이터 시트보기 (PDF) - Novatek Microelectronics

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NT7701H-TABF3

160 Output LCD Segment/Common Driver

Novatek Microelectronics 

NT7701

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 occur, 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 (50-100Ω) or fuse to the LCD driver power V0 of the system as a current

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

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

driver power supply after resetting logic condition of this LSI inside on 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 VSS 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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