ST8024T Sitronix Technology, ST8024T Datasheet - Page 15

• Manufacturer Part Number: ST8024T
• Description: COM/SEG LCD Driver
• Manufacturer: Sitronix Technology

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8.
.
Preliminary Ver 0.12
/DISPOFF
PRECAUTIONS
Precautions when connecting or disconnecting the power supply
This IC has a high-voltage LCD driver, so it may be permanently damaged by a high current which
may flow if voltage is supplied to the LCD drive power supply while the logic system power supply
is floating. The details are as follows,
And when connecting the logic power supply, the logic condition of this IC inside is insecure.
Therefore connect the LCD drive power supply after resetting logic condition of this IC inside on
/DISPOFF function. After that, cancel the /DISPOFF function after the LCD drive power supply
has become stable. Furthermore, when disconnecting the power, set the LCD drive output pins to
level LGND on /DISPOFF function. Then disconnect the logic system power after disconnecting
the LCD drive power.
When connecting the power supply, follow the recommended sequence shown here
V
V
When connecting the power supply, connect the LCD drive power after connecting the logic
system power. Furthermore, when disconnecting the power, disconnect the logic system power
after disconnecting the LCD drive power
It is advisable to connect the serial resistor (50 to 100
the system as a current limiter. Set up a suitable value of the resistor in consideration of the
display grade.
DD
0
LGND
LGND
GND
V
V
DD
DD
V
0
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) or fuse to the LCD drive power V
ST8024T
2008/01/24
0
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