The phyCARD-M on the phyBASE
©
PHYTEC Messtechnik GmbH 2010 L-750e_1
97
Caution:
There is no protective circuitry for the backlight. Close jumper JP2
only if a 12 V power supply is connected to X28 as primary supply for
the phyBASE.
17.3.7.3
Touch Screen Connectivity
As many smaller applications need a touch screen as user interface,
provisions are made to connect 4- or 5- wire resistive touch screens to
the display data connector X6 (pins 34 - 38, refer to
Table 36
). Two
touch screen controllers are available on the phyCARD Carrier Board.
The Wolfson WM9712L audio/touch codec at U1 allows connecting
4- and 5-wire touch panels, whereas the STMPE811 touch panel
controller at U28 is suitable for 4-wire touch panels only. Switches 1
and 2 of DIP-Switch S3 select which controller is used to process the
touch panel signals. The different configurations are shown in
Table
39
.
Button Setting Description
S3_1/
S3_2
0/0
0/1
1/0
Switches 1 and 2 of DIP-Switch S3 select which
device process the audio and touch panel
signals.
Wolfson audio/touch contrl. (U1) selected for
touch and audio
Wolfson audio/touch contrl. (U1) selected for
audio, dedicated touch contrl. (U28) for touch
Analog Devices audio contrl. (U17) selected for
audio, dedicated touch contrl. (U28) for touch
Table 39:
Selection of the touch screen controller