Apalis Carrier Board Design Guide
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Figure 22: USB 2.0 client block diagram
USBO1_EN, USBO1_OC# and USBO1_ID pins are not used in this configuration. The USBO1_EN
pin can be left unconnected. The USBO1_OC# should be pulled up to 3.3V or disabled in the
software. The USBO1_ID pin needs to be pulled up to 3.3V or the OTG port needs to be
configured by the software to be the client only.
The USBO1_VBUS pin can be connected directly to the USB bus power supply of the USB Type B
connector. This signal is needed to indicate to the system that a host is connected at the other end
of the USB cable.
Figure 23: USB 2.0 client reference schematic
2.5.2.3
USB 3.0 Host Connector Schematic Example
The following schematic example shows how to use the USBH4 port as a USB 3.0 host interface. As
USB 3.0 is backward compatible, this port could also be used as a USB 2.0 host interface.
Apalis Module
Carrier Board
TX
RX
USB
USBO1_SSTX-
USB
USBO1_SSRX-
2x 100nF
USBO1_D-
USBO1_D-
RX/TX
U
SB
3
.0
O
TG
C
o
n
tr
o
lle
r
Super
Speed
USB 2.0/1.1
M
o
d
u
le
C
o
n
n
e
ct
o
r
U
SB
2
.0
C
o
n
n
e
ct
o
r
D+
D-
U
SB
2
.0
H
o
st
USB 2.0/1.1
RX/TX
U
SB
2
.0
C
o
n
n
e
ct
o
r
USB Drive
USB Cable
TVS
Diode
GND
2A
220R@100MHz
L1
90R@100MHz
1
2
3
4
L2
USBO1_D_N
USBO1_D_P
USBO1_D_CON_N
USBO1_D_CON_P
330R
R3
GND
GREEN
LED1
SHIELD
VCC_USBO1
VCC_USBO1
GND_USBO1
Optional
MM70-314-310B1
USBO1_VBUS
60
Apalis - USB
3 of 25
USBH2_D-
82
80
USBO1_SSTX-
70
USB
68
USBO1_ID
72
USBO1_SSRX-
64
USB
62
USBH_EN
84
USBH3_D-
88
86
USBH4_D-
100
98
USBO1_D-
76
74
USBH_OC#
96
USBH4_SSTX-
104
USB
106
USBH4_SSRX-
92
USB
94
USBO1_OC#
262
USBO1_EN
274
X1C
USBO1_OC#
R2
100K
3.3V_SW
USBO1_ID
R1
100K
3.3V_SW
USBO1_VBUS
RCLAMP0504S
1
2
3
4
5
6
D1
4A
39R@100MHz
L3
100nF
C1
SHIELD
5V_ESD
SHIELD
5V_SW
VCC
1
D-
2
D+
3
GND
4
S1
S2
61729-0010BLF
X2