Iei-integration ICE-DB-9S Bedienungsanleitung PDF herunterladen (Seite 75)

ICE Module

Page 62

4.6.2 LVDS Cable Consideration

Balanced cables (twisted pair) are usually better than unbalanced cables (ribbon cable)

for noise reduction and signal quality. Balanced cables tend to generate less EMI due

to field canceling effects and also tend to pick up electromagnetic radiation as

common-mode noise, which is rejected by the receiver. Twisted pair cables provide a

low-cost solution with good balance and flexibility. They are capable of medium to long

runs depending upon the application skew budget. A variety of shielding options are

available.

Ribbon cables are a cost effective and easy solution. Even though they are not well

suited for high-speed differential signaling they do work fine for very short runs. Most

cables will work effectively for cable distances of <0.5m.

4.6.3 Backlight and LCD Power Timing Control

Figure 4-25 is a reference design of backlight and LCD power timing control. In Figure

4-26, VIN is LCD power and lamp is LCD backlight power.

Figure 4-27 shows the LCD

power sequence, and design must conform to it’s power sequence.

LVDS_VDD_EN3

C269

1000P_4_X_50V

LVDS

C273

2.2U_6_Y _10V

C272

10U_1210_Y _25V

3.3V(Default)

2-3

1-2

J_VLVDS1

J_VLVDS1(1-2)

MIN I J U MPER _1X2_2

Q2A

FDS6975_SOP8

R145

1M_4

+V12

+V3.3_LCD_PANEL

2N7002_SOT23

R151

100K_4

+V3. 3

+V5

J_VLVDS1

HEADER_1X3_2

C110

10U_8_X_6V3

C109

10U_8_X_6V3

+V3.3

C270

0.1U_4_Y _16V

C271

0.1U_4_Y _16V

R417 100K_4

1 2

+V5

Figure 4-25: LVDS Power Control

1 2 ... 70 71 72 73 74 75 76 77 78 79 80 ... 158 159

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