RN171 datasheet(12/30 Pages) MICROCHIP

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RN171

DS70005171B-page 12

 2014-2016 Microchip Technology Inc.

FIGURE 3-2:

RN171 APPLICATION SCHEMATIC – BATTERY BOOST POWER MODE

FIGURE 3-3:

IN-SYSTEM PROGRAMMING (ISP) HEADER

3.2

External Antenna Types

The RN171 module has a 50Ω antenna connection on

pin 24. Connect to an antenna through a host PCB

micro-strip trace layout to an external connector, PCB

trace antenna, or component (chip) antenna. This trace

can be extended to include passive parts for antenna

attenuation padding, impedance matching, or to pro-

vide test ports. Other components, such as amplifiers

and active drivers, are not considered part of the trace

layout and may void the RN171’s modular certification.

It is recommended that the trace layout from pin 24 to

the external connector or antenna be as short as pos-

sible for minimum loss and best impedance matching.

If the trace layout is longer, it should be a 50Ω imped-

ance microstrip or coplanar waveguide PCB trace.

Adjacent ground pins 21-23 and 25-27 should be con-

nected to a low-impedance ground plane on the host

PCB.

Modular certification of the RN171 module was per-

formed with the external antenna types listed in

Table 3-1. An antenna type comprises antennas having

similar in-band and out-of-band radiation patterns.

Refer to Section 4.0, Regulatory Approval for specific

regulatory requirements by country.

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