Appendices
46
© NXP Semiconductors 2017
JN-UG-3121 v1.1
A.1.1 Power Source Selection
Power configuration on the Carrier Board involves two stages with corresponding
jumpers:
5V Regulator:
Jumper
JP1
is used to enable/disable the 5V voltage regulator
that is required when using external power sources (DC or USB) but not for
battery power
Module Power:
Jumpers
JP4-1
and
JP4-2
are used to select the supply
voltage for the JN517x module site
The locations of the
JP1
and
JP4
jumpers are shown in
on page
use of these jumpers is described below. For more detailed information about the
power supplies, refer to the
Carrier Boards and Expansion Boards Reference Design
(JN-RD-6036)
.
Voltage Regulator
The Carrier Board can be powered from any one of:
4 AAA batteries on underside of the board
External 5-12V DC supply via 2.1mm connector
External device via USB Mini B connector
The on-board 5V voltage regulator must be enabled for the external DC and USB
power supplies but must be disabled for battery power. The regulator is enabled by
putting the jumper
JP1
in the
5V REG
position and disabled by putting the jumper in
the
BAT
position, as illustrated in the figure below.
Figure 16: JP1 Jumper Positions
Tip:
If batteries are being used and the board is going to
be left in the idle state for a significant length of time, the
batteries should be removed in order to conserve their
power.
JP1
DC or USB (regulator used)
Batteries (regulator not used)
5V REG
BAT
5V REG
BAT
