RN4020 datasheet(13/28 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS50002279B-page 13

RN4020

7.0

SUPPORTED SERVICES

The RN4020 firmware support the built-in public ser-

vices listed in Table 7-1. The services are enabled via

Command API and serviced in the same manner. Each

service manages “Characteristics” which are declared

and defined by Bluetooth as data values. The values

for each characteristic are cached in modules memory

and can be read by another Bluetooth device such as

smartphone acting in Central role. The values of every

Characteristic are updated via Command API over

UART.

7.1

Public and Private Services

The RN4020 provides the ability to create private ser-

vice. If the services are supported on both end points of

a Bluetooth Low Energy connection, such as Central

and Peripheral devices, data can be exchanged. For

example, two RN4020 modules can define a custom

(private) service with its own unique UUID and GATT

characteristics. Data can be exchanged easily via

Command API.

Private services are not registered with the Bluetooth

SIG, and therefore not interoperable with other Blue-

tooth Low Energy devices, unless the device imple-

ments the private service. An example of a built-in

private service is Microchip Streaming Data service.

For an example on how to create a custom service

using the RN4020, refer to RN4020 Bluetooth Low

Energy Module User’s Guide (DS70005191).

7.2

PCB Antenna

The PCB antenna is fabricated on the top copper layer

and covered in solder mask. The layers below the

antenna do not have copper trace. It is recommended

that the module is mounted on the edge of the host

PCB. Having PCB material below the antenna structure

is permitted as long as no copper traces or planes are

on the host PCB in that area.

Table 7-2 provides the antenna specification.

Figure 7-1, Figure 7-2, and Figure 7-3 show the

antenna efficiency, the antenna plot, and the 3D

radiation pattern.

FIGURE 7-1:

EFFICIENCY

TABLE 7-1:

SUPPORTED PUBLIC

SERVICES ON RN4020(1)

Service Name

Bluetooth SIG UUID

Device Information

0x180A

Battery

0x180F

Heart Rate

0x180D

Health Thermometer

0x1809

Glucose

0x1808

Blood Pressure

0x1810

Running Speed Cadence 0x1814

Cycling Speed Cadence

0x1816

Current Time

0x1805

Next DST Change

0x1807

Reference Time Update

0x1806

Link Loss

0x1803

Immediate Alert

0x1802

TX Power

0x1804

Alert Notification

0x1811

Phone Alert Status

0x180E

Scan Parameters

0x1813

Note 1: The services listed above are based on

firmware version 1.20. For the latest list of

supported services, refer to the firmware

version on the RN4020 web page.

TABLE 7-2:

ANTENNA

CHARACTERISTICS

Specification

Description

Type

PCB

Frequency Range

2.402 to 2.485 MHz

Peak Gain

-0.23 dBi

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