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 | 32
2.4.2.6
USB 2.0 Host Connector Schematic Example
Figure 26: USB 2.0 host block diagram
Limiting the USB host port to USB 2.0 can cut cost on the carrier board. Additionally, not all Verdin
modules support the SuperSpeed signals for the USB_2 port. The implementing an USB 2.0 host
port means that the SuperSpeed signals of the module edge connector can be left unconnected.
Since in the USB 2.0 specifications, the output current is limited to 500mA, the power budget on
the 5V rail maybe can be reduced which can be another cost saver.
Figure 27: USB 2.0 host reference schematic
2.4.3
Unused USB Signal Termination
Verdin
Pin
Verdin
Signal Name
Recommended Termination
165
USB_1_D_P
Leave NC if not used
163
USB_1_D_N
Leave NC if not used
161
USB_1_ID
Leave NC and set the USB port direction in software to host or client OR ground the pin if port is
used permanently as host OR add pull-up resistor if port is used as slave.
159
USB_1_VBUS
Leave NC if not used
155
USB_1_EN
Leave NC if not used
157
USB_1_OC#
Add pull-up resistor or disable the over-current function in software
183
USB_2_D_P
Leave NC if not used
181
USB_2_D_N
Leave NC if not used
177
USB_2_SSRX_P
Leave NC if not used
175
USB_2_SSRX_N
Leave NC if not used
171
USB_2_SSTX_P
Leave NC if not used
Verdin Module
Carrier Board
TX
RX
USB_2_SSTX_P
USB_2_SSTX_N
USB_2_SSRX_P
USB_2_SSRX_N
2x 100nF
USB_2_D_P
USB_2_D_N
USB_2_D_P
USB_2_D_N
RX/TX
U
SB
3
.x
H
o
st
Super
Speed
USB 2.0/1.1
M
o
d
ul
e
C
on
n
ec
to
r
D+
D-
USB Device
USB Cable
TVS
Diode
U
SB
2
.0
A
R
ec
ep
ta
cl
e
U
SB
2
.0
D
ev
ic
e
USB 2.0/1.1
RX/TX
U
SB
2
.0
A
P
lu
g
U
SB
2
.0
B
P
lu
g
U
SB
2
.0
B
R
ec
ep
ta
cl
e
2A
220R@100MHz
L3
1nF
50V
C3
GND_USBH2
100nF
16V
C1
GND
100uF
10V
+
C2
GND
GND
2A
220R@100MHz
L2
90R@100MHz
1
2
3
4
L1
USB_2_D_N
USB_2_D_P
USB_2_D_CON_N
USB_2_D_CON_P
TPD2EUSB30DRTR
1
2
D+
D-
D2
GND
GND_USBH2
VCC
1
D-
2
D+
3
GND
4
292303-1
S1
S2
S3
S4
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
+V1.8_SW
R1
100K
TPS2052BD
EN_1
3
OUT_1
7
OC_1#
8
IC1A
GND
TPS2052BD
EN_2
4
OC_2#
5
OUT_2
6
IC1B
+V5_SW
TPS2052BD
GND
1
V_IN
2
IC1C
GND
GND
1nF
2KV
C4
1M
R2