Timing Chart for PS Operation
CK
1
PS
OS1-OS240
LH1687
1
2
Sampling Data Output Period
Output Hi-impedance Period
Timing Chart for CTR Operation
CK
1
2
1
CTR
OS1-OS240
Sampling Data Output Period
2
Sampling of System A
&
Output Period System B
Sampling of System B
&
Output Period System A
Sampling of System A
&
Output Period System B
PRECAUTIONS
Precautions when connecting or disconnecting
the power supply
This IC has some power supply pins, 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. Therefore, when connecting the power
supply, set the logic system input pins (SPIO,
SPOI, CK, CTR, MODE, SAME, RL, PS, TST1,
TST2, TST3, TST4) after supplying the voltage to
the logic system power supply pin (VCCL), and next
supplying the voltage to the LCD drive system
power supply pin (VCCA). Finally, set the LCD drive
system input pins (VA, VB, VC, TST5).
When disconnecting the power supply, follow the
reverse sequence.
When connecting or disconnecting the power
supply follow the recommended sequence shown
here.
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