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Chapter 3: Motherboard Connections
General Purpose I/O Header
The JGP1 (General Purpose Input/Output) header is an 8-bit general purpose I/O expander
on a pin header via the SMBus.
GPIO Header
Pin Definitions
Pin#
Definition
Pin#
Definition
1
P3V3SB
2
GND
3
GP_P3V3_GP0
4
GP_P3V3_GP4
5
GP_P3V3_GP1
6
GP_P3V3_GP5
7
GP_P3V3_GP2
8
GP_P3V3_GP6
9
GP_P3V3_GP3
10
GP_P3V3_GP7
Speaker
If you wish to use an external speaker, connect a cable to pins 1-4 on the JD1 header.
Speaker Connector
Pin Definitions
Pin#
Signal
1
P5V
2
NC
3
NC
4
R_SPKPIN
System Management Bus Header
A System Management Bus header for additional slave devices or sensors is located at
JSMBUS1 on the bottom side of the motherboard.
SMBus Header
Pin Definitions
Pin#
Definition
1
SMB_DATA
2
GND
3
SMB_CLK
4
NC
M.2 Storage Slot
An M.2 SSD socket is located at JMD1 on the bottom side of the motherboard. It deploys a
B-KEY for SATA/PCI-E SSD devices or USB/PCI-E WWAN or GNSS card. There is a screw
hole for securing a 2280 form factor card. Form factors 2242 and 3042 M.2 modules are
supported by an extender bracket.
