EM65568 ELAN Microelectronics Corp, EM65568 Datasheet - Page 58

• Manufacturer Part Number: EM65568
• Description: 130 Com/ 128 Seg 4096 Color Stn Lcd Driver
• Manufacturer: ELAN Microelectronics Corp

EM65568
130 COM/ 128 SEG 4096 Color STN LCD Driver
7.30 Precaution when Power ON and Power OFF
This LSI may be permanently damaged by high current that may flow if a voltage is supplied to the LCD driver power supply
while the system power supply is floating. The detail is as follows.
( i )When using as external power supply
˜³Procedure for Power ON
(1) Logic system (VDD) power ON, make reset operation.
(2) Supply external LCD drive voltage to corresponding pins (V0, V1, V2, V3 and V4)
˜³Procedure for Power OFF
(1) Set HALT register to “1” or make reset operation.
(2) Cut off external LCD drive voltage.
(3) Logic system(VDD) power OFF.
Note: connect the serial resistor (50 to 100è) or fuse to the LCD drive power V0 or VOUT(when only use internal voltage
conversion circuit) of the system as a current limiter. Moreover, set up the suitable value of the resistor in consideration of
LCD display grade.
( ii )When using the built-in power supply
˜³Procedure for Power ON
(1) Logic system(VDD) power ON
(2) Booster circuit system(VEE) power ON
(3) Make reset operation, booster and voltage conversion circuit enable.
If VDD and VEE voltages aren’t same potential, power on logic system (VDD) first.
˜³Procedure for Power OFF
(1) Set HALT register to “1” or make reset operation.
(2) Booster circuit system(VEE) power OFF.
(3) Logic system(VDD) power OFF.
If VDD and VEE are not same potential, cut off VEE first. After VEE, VOUT, V0, V1, V2, V3 and V4 voltages are below
LCD ON voltage (threshold voltage for Liquid crystal turn on), power off logic system (VDD).
* This specification is subject to be changed without notice.
58
2005/3/8 (V1.2)