I 2 C Bus Control; Power On Sequence - NEC MultiSync LCD1550ME Service Manual

9.4.2 Functions
Major function of I306 are as follows:
(1) Expansion of the display screen.
(2) Timing control for various signal types.
(3) Power-supply sequence (LCD panel).
2
9.5 I C bus control
9.5.1 Related ports of I306
Post Pin No.
P3.5 14
P3.4 13

9.6 Power ON sequence

When the POWER switch is pressed, the POWER OFF signal is turned "H". When this "H" potential is
detected, the CPU begins to establish the respective power supplies according to the sequence shown
below.
POWER
PPWR
DOTCLK
INV_EN
LED
DATA
I/O Signal name
O IICCLK
I/O IICDATA
140ms or more
100ms or more
430ms or more
110ms
Function
IIC bus clock
IIC bus data
7-7