3: Open-Q 845 µSOM Development Kit
Open-Q 845 µSOM Development Kit User Guide
34
Pi
n
No
Signal
Description
Pi
n
No
Signal
Description
37
DC_IN_12V
Voltage from DC Power Input
+12.0V
38
No net
39
GND
Ground
40
MB_VREG_1
P8
Carrier board switching regulator
+1.8V
1.
Population option changes are necessary in order to use this signal. See the carrier board
schematic (R-3) for more details.
For more details regarding configuring the GPIOs on this header, refer to the Open-Q 845 Software
Release Notes to determine feature support in the latest software release.
3.7.21 Audio Headset Jack J1800 (8)
In addition to the audio expansion headers, the Open-Q 845 µSOM Development Kit also includes a
standard 3.5mm audio headset jack J1800, which provides connection to headphone, microphone input
and headset detection circuits. See item 8 in Figure 1 for the carrier board location of this headset jack.
3.7.22 WLAN / BT Antenna Connections (13, 14)
The Open-Q 845 µSOM Development Kit WLAN/BT functionality is based on Qualcomm WCN3990
chipset. It provides WLAN/Bluetooth in 2x2 MIMO with two spatial streams IEEE802.11 a/b/g/n/ac
WLAN standards, and Blu LE 5.x + HS enabling seamless integration of WLAN/Bluetooth and low
energy technology.
The WCN3990 chipset is located on the µSOM, which has U.FL coax connectors for channel 0 (WLAN+BT)
and channel 1 (WLAN only). These connectors are mated to the Carrier board WLAN / BT PCB antennas
via coax cables. Figure 1 in 3.4.1 above shows how the two WLAN / BT are routed via the coax cables:
•
For channel 0 (WLAN+BT), see items 31 and 13 on Figure 1.
•
For channel 1 (WLAN only), see items 32 and 14 on Figure 1.
If a more advanced antenna solution is required, it is possible to connect custom antennas directly to
the µSOM U.FL connectors.
3.7.23 Quiet Thermistor RT800 (35)
The Open-Q 845 µSOM Development Kit includes a thermistor on the carrier board to allow for system
level thermal management. See item 35 in Figure 1 for the carrier board location of the Quiet
Thermistor RT800.
3.7.24 Haptic Output Header J802 (9)
The Open-Q 845 µSOM Development Kit includes a haptic output header J802, giving the user access to
the µSOM PMI8998 PMIC haptic output driver. This driver supports both ERM and LRA modes. See item
9 in Figure 1 for the carrier board location of this header. The pinout for this header is shown in the
table below.