Advantech PCA-6774 user manual 2.15 VGA/LCD interface connections, CRT display connector CN7

Unlike floppy drives, IDE hard drives can connect to either end of the cable. If you install two drives, you will need to set one as the master and one as the slave by using jumpers on the drives. If you install only one drive, set it as the master.

2.15 VGA/LCD interface connections

The PCA-6774’s display interface can drive conventional CRT displays and is capable of driving a wide range of flat panel displays as well, including passive LCD and active LCD displays. The board has two dis- play connectors: one for standard CRT VGA monitors, and one for flat panel displays.

2.15.1 CRT display connector (CN7)

CN7 is a standard 15-pin D-SUB connector commonly used for VGA.

Pin assignments for CRT display connector CN7 are detailed in Appendix B.

2.15.2 Flat panel display connector (CN22)

CN22 consists of a 40-pin connector which can support an 18-bit LCD panel. It is Hirose’s product no. DF13A-40DP-1.25 V.

The PCA-6774 provides a bias control signal on CN22 that can be used to control the LCD bias voltage. It is recommended that the LCD bias volt- age not be applied to the panel until the logic supply voltage (+5 V or +3.3 V) and panel video signals are stable. Under normal operation, the control signal (ENAVEE) is active high. When the PCA-6774’s power is applied, the control signal is low until just after the relevant flat panel sig- nals are present. CN22 can connect up to 18-bit TFT LCD.

2.15.3 Extension flat panel connector (CN23)

CN23 consists of a 20-pin connector which is Hirose's product no. DF13- 20DP-1.25V. The PCA-6774 supports a 36-bit LCD panel which must be connected to both the CN22 (40-pin) and CN23 (20-pin). The pin assign- ments for both CN22 and CN23 can be found in Appendix B.

2.15.4 LVDS LCD panel connector (CN25)

The PCA-6774 uses the VIA "Twister T" chip that supports 2 channel LVDS LCD panel displays. Users can connect to LVDS LCD with CN25.

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