RN4871 datasheet(19/48 Pages) MICROCHIP

19 / 48 page

 2016 Microchip Technology Inc.

DS50002489A-page 19

RN4870/71

4.4

RN4871U Module

Figure 4-10 shows the physical dimensions of the

RN4871U module. Figure 4-11 illustrates the recom-

mended PCB layout. It is highly recommended to

layout the host PCB as suggested in Figure 4-12.

Figure 4-13 shows the recommended placement for

the module on the host PCB board. For optimal

transmission and reception sensitivity, place the

module at the edge of the board.

A low-impedance ground plane ensures the best radio

performance (best range; lowest noise). Pin 1 (BT_RF)

is a 50 ohm connection that can be connected to an

external antenna such as a PCB trace antenna, a

component (chip) antenna, or through a host PCB

50 ohm micro-strip trace. This trace can be extended to

include passive parts for antenna attenuation padding,

impedance matching, or to provide test posts. It is

recommended that the micro-strip trace to be as short

as possible for minimum loss and best impedance

matching. If the micro-strip trace is longer, a 50 ohm

impedance is recommended.

FIGURE 4-10:

RN4871U MODULE DIMENSIONS

Top View

Bottom View

Side View

RN4871 Datasheet(PDF) 19 Page - Microchip Technology