RN4677 datasheet(11/31 Pages) MICROCHIP

11 / 31 page

 2015 Microchip Technology Inc.

DS50002377A-page 11

RN4677 BLUETOOTH® 4.0

DUAL MODE MODULE

USER’S GUIDE

Chapter 1. Introduction

1.1

OVERVIEW

Microchip RN4677 Certified Bluetooth Dual Mode module supports both Bluetooth

Classic and Bluetooth Low Energy (BLE) communication. Under Bluetooth Classic,

RN4677 implements standard Serial Port Profile (SPP) that supports serial data

transfer between two Bluetooth Classic devices.

In addition to SPP for Bluetooth Classic connectivity, the RN4677 introduces a private

Generic Attribute Profile (GATT) service for serial data transfer between two BLE

devices. This BLE data streaming service provided in the RN4677 is named

“Transparent UART”. Therefore, the RN4677 is a Dual mode Bluetooth module, which

supports both Bluetooth Classic and BLE serial data connectivity.

RN4677 module is developed on top of Microchip's IS1677 Bluetooth IC. The primary

difference between RN4677 firmware and the standard firmware in the IS1677 is that

the RN4677 provides the control interface based on ASCII commands. The command

interface on RN4677 is very similar to that of RN41/42/52/4020, providing an easy

migration path for customers who are currently using RN modules.

Interactive ASCII commands enable the RN4677 to be configured without complex and

customer configuration tools. Like the other RN modules, the RN4677 also supports

master/central capability, actively scanning for other connectable devices instead of

waiting for incoming connection requests.

1.2

COMMAND MODE VS. DATA MODE

RN4677 operates in two modes: Data mode (default) and Command mode. When

RN4677 is connected to another device and in Data mode, RN4677 acts as a data pipe:

anything received from UART is passed to the connected peer device through SPP if

connected to a Bluetooth Classic device, or via a private GATT service if connected to

a BLE device. When data is received from the peer device from SPP for Bluetooth

Classic or UART Transparent for BLE, such data outputs directly to UART.

RN4677 is configured or controlled, or both by setting it into Command mode and

executing ASCII commands over UART. All configuration changes made by Set

commands remain in Non-Volatile Memory (NVM) and survive the power cycle. Any

configuration changes must take effect after a reboot. All Action commands take effect

immediately, but have no effect after power cycling.

RN4677 датащи(PDF) 11 Page - Microchip Technology