Doc. No: Unex-QSG-21-001
14/27
A printed version of this document is an uncontrolled copy
© 2021 Unex Technology Corporation – Company Confidential
Table 7: I/O port pin map (J8)
Pin No,
10
9
8
7
6
5
4
3
2
1
Symbol
GPIO1
USB1_
VBUS
USB1_
DP
CAN1_H CAN0_H
GND
TX
RX
RESET POWER
Pin No.
20
19
18
17
16
15
14
13
12
11
Symbol
GPIO2
GND
USB1_
DN
CAN1_L CAN0_L
GND
EXT_
GNSS_
TX
EXT_
GNSS_
RX
EXT_
1PPS
GND
Table 8: I/O port pinout (J8)
Pin
Symbol
I/O
Level (V)
Description
J8.1
POWER
I
-
6-48V DC input, 12W
J8.2
RESET
I
3.3
Reset CRATON2 Linux system. (Active LOW)
Low=reset, high or float=running
J8.3
RX
O
5.0
RS232 serial data to DTE (console)
J8.4
TX
I
5.0
RS232 serial data from DTE (console)
J8.5
GND
G
-
Ground
J8.6
CAN0_H
I/O
5.0
CAN0 High. 1K
Ω split termination resistors inside CAN0 port.
J8.7
CAN1_H
I/O
5.0
CAN1 High. 1K
Ω split termination resistors inside CAN1 port.
J8.8
USB1_DP
I/O
0.4
USB 2.0 data +
J8.9
USB1_VBUS
O
5.0
USB Vbus power output 5V/900mA
GPIO508=0, USB1_VBUS OFF;
GPIO508=1, USB1_VBUS ON (default)
J8.10
GPIO1
I/O
3.3
GPIO1
J8.11
GND
G
-
Ground
J8.12
EXT_1PPS
I
3,3
External 1PPS input
J8.13
EXT_GNSS_RX
I
5.0
RS232 serial data from DCE (e.g., an external GNSS device)
J8.14
EXT_GNSS_TX
O
5.0
RS232 serial data to DCE (e.g., an external GNSS device)
J8.15
GND
G
-
Ground
J8.16
CAN0_L
I/O
5.0
CAN0 Low. 1
KΩ split termination resistors inside CAN0 port.
J8.17
CAN1_L
I/O
5.0
CAN1 Low. 1K
Ω split termination resistors inside CAN1 port.
J8.18
USB1_DN
I/O
0.4
USB 2.0 data -
J8.19
GND
G
-
Ground
J8.20
GPIO2
I/O
3.3
GPIO2
Figure 9: I/O port cable connector
Female Terminal
JST SCPT-A021GF-0.5
Female Connector
JST 20CPT-B-2A (Rear)
Female Connector
JST 20CPT-B-2A (Front)
