PDA320240D-03 查看數據表（PDF） - Varitronix international limited
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PDA320240D-03 Datasheet PDF : 17 Pages
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VL-PS-PDA320240D-03 REV. A
(PDA320240D-03)
JUN/2005
PAGE 15 OF 17
4.5 Precaution when Connecting and Disconnecting the Power
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 (50-100 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
on /DOFF function. After that, the /DOFF 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 /DOFF function. After that, disconnect the logic system power after disconnecting the
LCD driver power.
When connecting the power supply, follow the recommended sequence shown.
Figure 4: Power sequence
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