Doc. No: Unex-QSG-21-001
12/27
A printed version of this document is an uncontrolled copy
© 2021 Unex Technology Corporation – Company Confidential
Table 4: LED function
Position
Symbol
Color
Description
1
STATUS
Green
Amber
Red
Start-up: Blinking Green
Operational: Solid Green
FW upgrade: Amber
Fault: Red
Please refer software instructions for implementation
2
POWER
Green
System power indicator
3
1PPS
Green
ON: 1PPS signal HI
OFF: 1PPS signal LOW
Blinking: receiving 1PPS signal
4
EXT_GNSS
Green
ON: 1PPS and NMEA from external GNSS module
OFF: 1PPS and NMEA from internal GNSS module
5
WWAN
Green
ON: LTE module connected to WWAN
6
LED1
Green
User defined LED
7
LED0
Green
User defined LED
8.1.1.2.
USB0
Figure 6: USB0 (CN2)
Table 5: USB0 (CN2) pinout
Pin
Symbol
I/O
Level (V)
Description
CN2.1
VBUS
I/O
5.0
USB device mode = USB 5V power input
USB host mode = 5V/900mA power output (e.g., when
connecting an OTG cable)
CN2.2
D-
I/O
0.4
Data -
CN2.3
D+
I/O
0.4
Data +
CN2.4
ID
I
-
USB device mode = NC
USB host mode = Tied to GND (e.g., connecting an OTG cable)
CN2.5
GND
G
-
Ground
USB0 (CN2) on OBU-301(v2)/OBU-351 is a USB 2.0 dual role device which can act as
either a USB device or a USB host. The connector of USB0 is mini-B.
When connecting to a computer or a USB charger with a regular mini-USB cable, OBU-
301(v2)/OBU-351 acts as a USB device and is powered by the external Vbus. However,
when connecting to another USB device (e.g., USB flash drive) with a mini-USB OTG cable,
OBU-301(v2)/OBU-351 acts as a USB host and starts providing 5V Vbus power to the USB
device up to 900mA.
The power input/output is determined by the hardware design of the OTG cable.
However, setting of the USB mode and detection of external device should be implemented
by the user.
