3: Open-Q 865XR SOM Development Kit
Open-Q 865XR SOM Development Kit User Guide
18
Item
Position
Description
Specification
Usage
be used by the dev kit
user.
Current Sense
Header (VPH_PWR)
35
3 pin header
Sense lines connected
across 0.005 Ohm
resistor
To measure current
consumption of
SOM_VPH_PWR
Current Sense
Header
(SOM_SYS_PWR)
39
3 pin header
Sense lines connected
across 0.005 Ohm
resistor
To measure current
consumption of
SOM_SYS_PWR
M.2 PCI Express
Connector (on
bottom)
24
M.2 PCI Express for external
peripheral connectivity
M.2 PCI Express B-Key
interface.
For external M.2 PCIe
card
WWAN SIM Card
(on bottom)
25
WWAN SIM card connector
(optional)
For WWAN M.2 PCI
express cards
3.7.1 SOM Board to Board Connectors (33)
The Open-Q 865XR SOM connects to the carrier board via two 100 pin and one 120 pin Hirose DF40
connectors which allows essential power rails and signals to be exposed for supporting other peripherals
and interfaces on the platform. For the list of signals exposed by the SOM, see the device specification
(Ref. R-1).
3.7.2 Boot Configuration DIP Switch S2500 (37)
There is a DIP switch S2500 and one 2pins header on the top side of the Open-Q 865XR SOM carrier
board. The 2-bit switch allows the user to control the system configuration and boot options. The 2pins
header is for Force USB Boot mode select. The image below shows the DIP switch and header
assignments.
Figure 3. DIP switch assignments
See the table below for a description of the DIP switch and header connections.