Appendix D: QVGA Schematics

The QVGA Controller comprises two PC boards, designated the QED Board and the QVGA Board.

The QED Board contains the processor, RAM and Flash memory, digital I/O, A/D and D/A.

The QVGA Board contains power conditioning,, display and touchscreen interface circuits, Wildcard module ports, and additional RAM and Flash memory.

This Appendix provides complete circuit schematics for each board.

Figure D-1 QED Board (PN: QED-4-QVGA) Processor.

Figure D-2 QED Board Memory.

Figure D-3 QED Board PIA and High Current Drivers.

Figure D-4 QED Board PAL Glue Logic.

Figure D-5 QED Board Serial Communications Drivers.

Figure D-6 QED Board Reset Circuitry.

Figure D-7 QED Board Power Conditioning. (The regulator and input filter are not installed; the QED-4-QVGA Board receives filtered and regulated power from the QVGA Board).

Figure D-8 QED Board 12-bit A/D and 8-bit DAC.

Figure D-9 QED Board Connector Pin-Outs.

Figure D-10 QVGA Board Schematic Signal Directory.

Figure D-11 QVGA Board CPLD and Bus Multiplexers.

Figure D-12 QVGA Board Display Controller.

Figure D-13 QVGA Board Memory.

Figure D-14 QVGA Board Touchscreen Controller and Backlight Supply.

Figure D-15 QVGA Board LCD Bias/Contrast.

Figure D-16 QVGA Board Power.

Figure D-17 QVGA Board Display/Touchscreen Headers and Touchscreen Intrinsic Safety Barrier (ISB).

Figure D-18 QVGA Board Wildcard Module Bus Ports and Serial Connectors.