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OTG on Pin Group 1 Using 3-Wire OTG Transceiver
Figure 60.
OTG on USB Pin Group 1 Using 3-Wire OTG Transceiver
U1
MCBSP3.CLKX/USB1.TXEN
MCSI1.DOUT/USB1.TXD
RTC_WAKE_INT/USB1.SE0
GPIOX
I2C.SCL
I2C.SDA
OMAP5912
SPRU761A
If you want to use the external OTG transceiver ability to provide I
to the transceiver D+ and D- pins, it is necessary to control the OTG
transceiver OEn input using an OMAP5912 GPIO pin. It is also necessary to
set USB_TRANSCEIVER_CTRL.CONF_USB0_ISOLATE to 1 to ensure that
2
the I
C signals have no effect on the OMAP5912 USB controllers.
OE
OE
TXDAT/RCVDAT
DAT
TXSE0/RCVSE0
SE0
OTGIRQ
INT
SCL
SCL
SDA
SDA
USB OTG transceiver
R1, R2
C1
U1
U2
U3
J1
Proper initialization of the OMAP5912 device to support this mode of operation
requires proper setting of the top-level pin multiplexing for these pins:
-
MCBSP3.CLKX/USB1.TXEN
-
MCSI1.DOUT/USB1.TXD
-
RTC_WAKE_INT/USB1.SE0
See Table 74.
U2
R1
D+
D−
R2
ID
VBUS
VDD
Value depends on transceiver
VBUS capacitance must meet OTG spec C DRD_VBUS
OMAP5912
USB OTG transceiver
Transient suppressor, like SN65220, SN65240, or SN75240
USB mini-AB receptacle
Universal Serial Bus (USB)
USB OTG Controller
2
C signaling
J1
Transient
U3
suppressor
C1
267
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