Phytec phyBoard Wega AM335x, Application Manual

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Advanced Information
©
PHYTEC Messtechnik GmbH 2014 L-792e_1
97
4.6.1.3 Rerouting the USB Interfaces to different Connectors (J72 – J75, J79 and J80)
For later expansion boards one of the two USB interfaces can be routed to the expansion
connector (X69). The following table shows all possible configurations.
Mode J72 J73 J74 J75 J79 J80
USB1 at USB-A connector X15 and
USB0 at USB-OTG connector X42
1+2 1+2 1+2 1+2 nm nm
USB1, USB1_VBUS and X_USB1_ID
at expansion connector X69
2,3
USB0 at USB-OTG connector X42
2+3 2+3 1+2 1+2 1+2
4
1+2
USB0, USB0_VBUS and USB0_ID at
expansion connector X69
2,3
USB1 at USB-A connector X15
1+2 1+2 2+3 2+3 2+3 2+3
Table 14: USB Routing Configuration
4.6.2 I
2
C Connectivity
The I
2
C interface of the AM335x is available at different connectors on the
phyBOARD-Wega. The following table provides a list of the connectors and pins with I
2
C
connectivity.
Connector Location
Expansion connector X69 pin 11 (X_I2C0_SDA);
pin 13 (X_I2C0_SCL)
A/V connector X71 pin 16 (X_I2C0_SDA);
pin 15 (X_I2C0_SCL)
Table 15: I
2
C Connectivity
To avoid any conflicts when connecting external I
2
C devices to the phyBOARD-Wega the
addresses of the on-board I
2
C devices must be considered. Table 16 lists the addresses
already in use. The table shows only the default address.
2
: Caution! There is no protective circuit for the USB interfaces brought out at the expansion connector
3
: Caution! The voltage level of the USB ID signal X_USB_ID_EXP, is 1.8 V. Steady state voltages above 2.1 V applied to this
signal may damage the AM335x.
4
: Note: The ID pin of USB1 is hardwired. To use the function at the expansion connector R399 must be removed, too.