Eurotech PXA320, User Manual, Page: 19 / 62

Hardware Specification
110120-1000A
19
User Interface and Display
The PXA320 includes an integrated PXA320 display controller to drive liquid crystal
displays (LCDs). These data and control signals, as well as display power, backlight
power and control, VEE adapter control, and touch panel signals are available on the
GCM. In addition, the GCM includes an audio subsystem providing an audio line in,
headphone output, and stereo speaker output.
Display
Displays are available in a variety of types and sizes and have a range of voltage and
data requirements. To meet these various requirements, the GCM provides a 16-bit
(565 RGB) LCD interface, an adjustable display power supply, and adjustable display
signal voltage levels.
The following table summarizes the display capabilities.
Feature Description
Resolution Up to 1024 x 768
Display Power 5 V (optional 3.3 V)
Display Buffer 3.3 V signal levels (optional 5 V)
Scan Direction Optional settings for PNL_RL (right-to-left) and PNL_UD
(up-and-down) signals for active displays
Contrast Control Contrast control of some passive displays
Features are set at time of production. Contact your local Eurotech technical support if
your application requires any of the volume production options.
The display interface is available on header J6 , page 32 . For electrical specifications,
see Display, VEE Adapter, and Backlight , page 49 .
VEE Adapter
Many passive panels require a positive or negative bias voltage in the range of fifteen to
thirty volts to bias the passive LCD. Some displays include a VEE generator and require
a low-voltage analog signal to control the contrast.
The GCM supports an external VEE power supply adapter on header J7 , page 33 . This
header supplies power and three control signals driven by the PXA320 to the adapter
and receives VEE power from the adapter. For electrical specifications, see Display,
VEE Adapter, and Backlight , page 49 .
The following table describes the VEE adapter control signals.
J7 Pin Name Type PXA320 Signal Description
3 VEE_CTL O GPIO4_2 VEE adapter on and off control
5 VCON O PWM1 Low-voltage contrast control
6 VPCLK O LPCLK Display controller pixel clock