Nordic Semiconductor nRF9160, Руководство пользователя, Страница: 18 / 48

Hardware description
An external active GPS antenna can be connected to connector J2 (U.FL compatible), and 3.3 V DC is fed
through J2 to supply the LNA of the external antenna. When using an external GPS antenna, the onboard
GPS LNA ( U2 ) must be disabled to avoid interference. This is done by ensuring that the GPS_EN signal is
low and it is set by the
AT%XCOEX0
AT command .
Note:
• GPS signals do not usually penetrate ceilings or other structures that well. Therefore, for best
GPS performance, the DK should be placed on a flat surface in an open space outside, far from
sources of interference and other structures that may block the signals from space.
• This functionality is only available if the modem firmware used in the nRF9160 supports GPS.
• The Molex patch antenna achieves the highest gain when placed horizontally on a surface (x-y)
facing the z-axis since it can receive all propagated GPS signals. A lower gain will be experienced
if the patch antenna is mounted on a surface is at an angle with the horizontal surface.
Figure 12: GPS connected to the nRF9160
4.6 GPIO interfaces
Access to the nRF9160
GPIO
s is available from connectors P2 , P3 , P4 , P6 , and P24 . The nRF9160 DK
supports the Arduino UNO interface.
Figure 13: Access to nRF9160 GPIOs
GPIO signals are also available on connectors P8 , P9 , P10 , P12 , and P27 , which are on the bottom side
of the DK . By mounting pin lists on the connector footprints, the nRF9160 DK can be used as a shield for
Arduino motherboards.
For easy access to GPIO, power, and ground, the signals can also be found on the through-hole connectors
P14 , P15 , P16 , and P17 .
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