phyCARD-M [PCA-A-M1-xxx]
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©
PHYTEC Messtechnik GmbH 2010 L-750e_1
If the Wolfson WM9712L audio/touch codec is chosen, the touch
screen data is available at the AC97 interface. An interrupt or the
pendown signal of the WM9712L, selected by jumper J1 (refer to
section 17.2.4
), is connected to the AC97 interrupt pin
(HAD_SEL/AC_INT, pin X2A42). The default configuration selects
the pendown signal to be attached to pin X2A42 of the phyCARD
Connector.
If the dedicated touch screen controller at U28 is chosen, the touch
screen data is available at the I
2
C interface of the X-Arc bus. The
controller's slave address can be selected with jumper J3 (refer to
section 17.2.4
). The default address of the controller is 0x88 (write)
and 0x89 (read). The interrupt output of the touch screen controller is
connected to GPIO2 (GPIO2_IRQ, pin X2A47) which extends to port
GPIO2_7 at T7 of the i.MX35 on the phyCARD-M.