LH1514 Datasheet, PDF (13/20 Pages) Sharp Electrionic Components – 80 OUTPUT LCD SEGMENT DRIVER

SHARP
LH1514AF
12
8. Precaution
OPrecaution
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 flow if a voltage is supplied to the LC drive
power supply while the logic system power supply is floating.
The detail is as follows.
*When connecting the power supply, connect the LC drive power after
connecting
the logic system power. Furthermore,
when disconnecting
the
power, disconnect the logic system power after disconnecting
the LC drive
power.
*We recommend you connecting the serial resistor (50 to 100 !I) to the LC
drive power Vs of the system as a current limitter
resistor. And set up
the suitable value of the resistor in consideration
of LC display grade.
And when connecting the logic power supply, the logic condition of this LSI
inside is insecurity.
Therefore connecting the LC drive power supply after
resetting logic condition of this LSI inside on DISPOFF function. After that,
cancel the DISPOFF function after the LC drive power supply has become
stable. Furthermore, when disconnecting
the power, set the LC driver output
pins to level V0 on DISPOFF function. After that, disconnect the logic system
power after disconnecting
the LC drive power.
When connecting the power supply. show the following recommend sequence.