Verdin Carrier Board Design Guide
Preliminary
– Subject to Change
Toradex AG l Ebenaustrasse 10 l 6048 Horw l Switzerland l +41 41 500 48 00 l
l
Page | 30
2.4.2.4
USB 3.x Host Connector Schematic Example
The USB_2 port of the Verdin module specifications reserves additional SuperSpeed signals which
makes it possible to provide a USB 3.x host interface. The SuperSpeed signals are physically
related to the PCIe interface. Therefore, special attention is required with the series capacitors. The
AC coupling capacitors of the TX SuperSpeed signals are located on the Verdin module while the
capacitors for the RX signals are located on the USB device. Therefore, no additional capacitors are
required nor permitted on the carrier board. The USB 2.0 data signals do not need any series
capacitors at all.
If the USB signals are externally available, ESD protection diodes need to be placed on all the USB
signals. Make sure that the protection diodes are compliant with the very high frequency of USB
3.x.
Figure 22: USB 3.x host block diagram
Please note that a Type A USB 3.x compliant host port needs to provide up to 900mA bus supply
while the USB 2.0 ports where only rated up to 500mA for a regular, non-charging port. Make
sure the bus voltage power distributor switch IC can deliver this higher current. According to the
USB specifications, a output capacitor of at least 100µF need to be added to the USB bus voltage.
Figure 23: USB 3.0 host reference schematic
2.4.2.5
USB 3.x Device Down Schematic Example
Device-Down means that the USB device is soldered to the carrier board. The AC coupling
capacitors for the SuperSpeed RX lane (TX from the device) need to be placed on the carrier board.
As the capacitors for the TX lane are located on the Verdin module, no additional capacitors are
required nor permitted on the TX lines.
ESD protection diodes and common mode chokes are usually not needed for device-down
implementations.
Verdin Module
Carrier Board
TX
RX
RX
TX
USB_2_SSTX_P
USB_2_SSTX_N
USB_2_SSRX_P
USB_2_SSRX_N
USB_2_SSTX_P
USB_2_SSTX_N
USB_2_SSRX_P
USB_2_SSRX_N
2x 100nF
2x 100nF
SSTX+
SSTX-
SSRX+
SSRX-
USB_2_D_P
USB_2_D_N
USB_2_D_P
USB_2_D_N
RX/TX
U
SB
3
.x
H
os
t
Super
Speed
USB 2.0/1.1
M
od
u
le
C
o
nn
ec
to
r
D+
D-
U
SB
3
.x
D
ev
ic
e
Super
Speed
USB 2.0/1.1
RX/TX
USB Device
USB Cable
TVS
Diode
TVS
Diode
TVS
Diode
U
S
B
3
.0
A
S
S
R
ec
ep
ta
cl
e
U
S
B
3
.0
A
S
S
P
lu
g
U
S
B
3
.0
B
S
S
P
lu
g
U
S
B
3
.0
B
S
S
R
ec
ep
ta
cl
e
2A
220R@100MHz
L8
GND
100uF
10V
C31
2A
220R@100MHz
L9
GND
GND_USB
USB S.S. Connector
GND
1nF
2KV
C26
USB_2_D_P
USB_2_D_N
USB_2_SSTX_P
USB_2_SSTX_N
USB_2_SSRX_P
USB_2_SSRX_N
GND
USB_2_D_CON_P
USB_2_D_CON_N
GND_USB
USBH2[0..7]
USB_2_OC#
100nF
16V
C30
1nF
50V
C32
GND_USB
1M
R28
TPS2066CD
EN_2
4
OC_2#
5
OUT_2
6
IC10B
+V5_SW
TPS2066CD
EN_1
3
OUT_1
7
OC_1#
8
IC10A
USB_2_EN
TPS2066CD
GND
1
V_IN
2
IC10C
GND
GND
12R@100MHz
1
2
3
4
L7
12R@100MHz
1
2
3
4
L54
12R@100MHz
1
2
3
4
L55
ESD9101P2T5G
D45
GND
ESD9101P2T5G
D46
GND
ESD9101P2T5G
D47
GND
ESD9101P2T5G
D48
GND
ESD9101P2T5G
D49
GND
ESD9101P2T5G
D50
GND
USB_2_SSTX_CON_P
USB_2_SSTX_CON_N
USB_2_SSRX_CON_P
USB_2_SSRX_CON_N
1932258-1
VCC
1
D-
2
D+
3
GND
4
SSRX-
5
SSRX+
6
GND-DRAIN
7
SSTX-
8
SSTX+
9
S1
S2
X2
USB_1_EN
155
USB_1_OC#
157
USB_1_VBUS
159
USB_1_D_N
163
USB_1_D_P
165
USB_1_ID
161
USB_2_SSTX_N
169
USB_2_SSTX_P
171
USB_2_SSRX_N
175
USB_2_SSRX_P
177
USB_2_D_N
181
USB_2_D_P
183
USB_2_EN
185
USB_2_OC#
187
X1H
2309409-2
USB_2_D_P
USB_2_D_N
USB_2_SSTX_P
USB_2_SSTX_N
USB_2_SSRX_P
USB_2_SSRX_N
USB_2_OC#
USB_2_EN
+V1.8_SW
R1
100K
