UBX-22039292 - R01
Hardware
Page 13 of 28
C1-Public
2.4
Power subsystem
XPLR-HPG-2 supports multiple power options, where:
•
USB-C connector (J1) supplies power directly to the board from the connected device
•
Battery connector (J7) supplies power from an externally connected single-cell Li-ion battery
•
MP2617H switch-mode battery charger (U12) manages power supply to the board through both
the USB-C connector (J1) and Li-ion battery.
In situations where the USB-C connector provides excessive power, the power path management
functionality offered by the latter battery charger option adjusts power to the XPLR-HPG-2 board and
charges the battery simultaneously. Conversely, the battery compensates for the power deficiency if
the USB-C connector provides insufficient power. A Li-ion battery can be connected to XPLR-HPG-2
through the (2-pin, 2 mm pitch, JST type) connector J7 .
⚠
Use a suitable single-cell, Li-ion type battery (like the Sparkfun
) with the same polarity
connections shown in
The output of the battery charger is connected to two Onsemi NCP690MNxx, 1 A, linear regulators
(U7 and U8). One regulator has a 3.3 V fixed output and the other has an adjustable output (set to
3.75 V). The 3.3 V regulator supplies the complete board except for the LTE modem, which is supplied
by the adjustable output.
Three LEDs indicate the power state of the device:
•
Charge
–
indicates that the battery is being charged.
•
VIN
–
powered by the charger output. Lit when the supply voltage is applied to the linear regulators.
•
3.3V
–
powered by the output of the 3.3 V linear regulator.
The location of the power LEDs on the C214 board is shown in
Figure 8: Power system components
–
showing battery connector polarity
2.5
USB subsystem
XPLR-HPG-2 incorporates a 4-port USB 2.0 hub that connect to the various u-blox modules through
the USB port that is used for monitoring, setup, and programming. NINA-W106 UART is connected
to the USB hub through a Silicon Labs CP2102N USB to UART chip (U2).
