PRODUCT GROUP

REV.

ISSUE DATE

TFT-LCD PRODUCT

A

2003.07.22

PAGE

SPEC. NUMBER

S864-1148

SPEC. TITLE

HT12X21-100 Product Specification

15

OF

22

B3-002-O (3/3)

A4 (210 X 297)

9.0 POWER SEQUENCE

To prevent a latch-up or DC operation of the LCD module, the power on/off sequence should be

as shown in below

l 0 < T1

≤ 10 ms

l 0 < T2

≤ 50 ms

l 100 ms

≤ T3, T4

l 0 < T5

≤ 50 ms

l 1 sec < T6

Notes:

1. When the power supply VDD is 0V, Keep the level of input signals on the low or keep high

impedance.

2. Do not keep the interface signal high impedance when power is on.

3. Back Light must be turn on after power for logic and interface signal are valid.

T1

Power Supply

Interface Signal

Back- light

Valid

T2

T5

T3

T4

0.9VDD

0.1VDD

0.9VDD

0.1VDD

0V

0

0

T6