Open-Q™ 835 Development Kit based on the Snapdragon™ 835 (APQ8098) Processor User Guide Version 1.0
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Copyright Intrinsyc Technologies Corporation
3.8.3 DC Power Input J0701
The Open-Q 835 Development Kit power source connects to the 12V DC power supply jack
J0701. Starting from the power jack, the 12V power supply branches off into different
voltage rails via step down converters on the carrier board and PMIC on the Processor
board. The Processor board is powered by 3.8V via a Silergy step down converter U0703
on the carrier board. To ensure the Processor board is getting powered correctly, user can
monitor the current going into the Processor board via the power probe header J0901 (see
section
below
).
Figure 7 J0701 12V DC Power Jack
The Processor board has 2 PMIC modules. Functionalities of the 2 modules are outlined
below.
PMI8998 PMIC is used for:
•
Source various regulated power rails
•
Battery charging. Please see section
below
for additional information on battery
support. A DIP S2302A switch is used to enable/disable charge function. Make sure
turn off battery charging when 12V DC in is used and USB charger is inserted.
•
Please note that support for battery charging over external charger is not
implemented in the design. Please contact Intrinsyc for such customization.
PM8998 PMIC is used for:
•
Source various regulated power rails
•
Source system clock
