EM65101
128COM/160SEG 16 Gray Scale Level LCD Driver
Power OFF Proper Sequence:
1) Set the HALT register to “1” or perform a reset operation
2) Cut off external LCD drive voltage
3) Logic system (VDD) power OFF
NOTE
Connect the serial resistor (50 to 100Ω) or fuse to the LCD drive power V0 or VOUT
(when using the internal voltage conversion circuit) of the system as a current limiter.
In addition, set a suitable resister value of the resistor depending on the quality of the
LCD display.
7.18.2 When Using the Built-in Power Supply
Power ON Proper Sequence:
1) Logic system (VDD) power ON
2) Booster circuit system (VEE) power ON
3) Perform a reset operation and enable the booster and voltage conversion circuit.
NOTE
If the VDD and VEE voltages do NOT have the same potential, the logic system
(VDD) is automatically powered on first.
Power OFF Proper Sequence:
1) Set the HALT register to “1” or perform a reset operation
2) Booster circuit system (VEE) power OFF
3) Logic system (VDD) power OFF
If VDD and VEE do NOT have the same potential, cut off VEE first. After the VEE,
VOUT, V0, V1, V2, V3, and V4 voltages are below the LCD ON voltage (threshold
voltage when the Liquid Crystal is turned on), power off the logic system (VDD).
7.18.3 Power Supply Rising Time
Although there is no constraint on the rising time of the power supply, the Tr (rising
time) as illustrated below is recommended for practical applications.
90%
VDD,VEE
10%
Tr
Recommended
Rising Time (Tr)
Item
Applicable Power
Tr
30µS ~ 10ms*
VDD, VEE
* The rising time is the time between 10% adnd 90% of VDD, VEE
Figure 7-21 Recommended Rising Time (Tr) for Practical Application
38 •
Product Specification (V0.4) 08.15.2005
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
