12048321 Rev. 01 (Draft)
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4.9. USB 2.0 Port 1B/C on 9-pin Pin-header
Reference Designator: J21
2.54mm Pitch Pin-header, THT, straight, 10 circuits with removed 9th pin
Description
The J25 standard USB2.0 internal pin-header provides two USB2.0 ports via USB2.0 Hub USB2514B.The
USB2514B uplink port is connected to the USB2.0 port 1 of the SMARC module.
Two downstream ports 1B and 1C of the USB Hub are connected to the J21. The downstream port 1B is shared with
upper port of J22 (USB2.0 Type-A). See more details in chapter
“Functional Exclusives and Shared Resources”
.
Interfaces used
USB 2.0 port 1B and 1C of the USB hub
Supplied by 5V S5 voltage (V_5V0_S5)
Current limited to 500 mA per port
Reference Designator: J21
2.54mm Pitch Pin-header, THT, straight, 10 circuits with removed 9th pin
Connector drawing and contact-numbering scheme
Figure 18 USB2.0 Pin-header
– J21
Pinout according to Data Modul Inhouse-Standard DMIS15
J21
Pin
Signal / Function
Pin Type
Signal Description
1
V_5V0_S5_USB1B
Power (5V)
5V/500mA power-supply for device 1B
2
V_5V0_S5_USB1C
Power (5V)
5V/500mA power-supply for device 1C
3
USB2_1B_N
IO DP
neg. signal of the differential 1B datapair
4
USB2_1C_N
IO DP
neg. signal of the differential 1C datapair
5
USB2_1B_P
IO DP
pos. signal of the differential 1B datapair
6
USB2_1C_P
IO DP
pos. signal of the differential 1C datapair
7
GND_USB1B
GND
Power ground for port 1B
8
GND_USB1C
GND
Power ground for port 1C
9
Not available (KEY)
n/a
removed pin (Key)
10
NC
n/a
not connected