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USB OTG Controller
Pin Group 1 USB Host Using 3-Wire USB Transceiver
Figure 67.
USB Host Connections On USB Pin Group 1 Using 3-Wire Transceiver
U1
MCBSP3.CLK/USB1.TXEN
MCSI1.DOUT/USB1.TXD
RTC_WAKE_INT/USB1.SE0
CLK32K_OUT/USB1.SPEED
MPU_BOOT/USB1.SUSP
GPIO
OMAP5912
276
Universal Serial Bus (USB)
OE
OE
TXDAT/RCVDAT
DAT
TXSE0/RCVSE0
SE0
SPEED
SPEED
SUSPEND
SUSPEND
VBUS_ENABLE
Overcurrent
R1, R2
R3, R4
C1
U1
U2
U3
U4
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
-
CLK32K_OUT/USB1.SPEED
-
MPU_BOOT/USB1.SUSP
See Table 74.
HMC_MODE must be set to a value that routes a host controller port to USB
pin group 1 (see Table 73). OTG_SYSCON_1.USB1_TRX_MODE must be
set to 2 to allow proper bidirectional operation of the 3-wire USB transceiver.
U2
D+
D−
VDD
USB transceiver
VBUS
control
Value depends on transceiver
15K Ohm 5%
Low ESR Cap, minimum 120 µF
OMAP5912
USB transceiver
Transient suppressor, like SN65220, SN65240, or SN75240
Power switch, like TPS2014 or TPS2015
USB type-A receptacle
R1
U3
Transient
suppressor
R2
R3
R4
VBUS
U4
C1
SPRU761A
J1
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