RN4678 Bluetooth® 4.2 Dual-Mode Module
The Easy-to-Use, Flexible Solution for BLE and Bluetooth Classic Connectivity
Summary
The RN4678 is a fully certified Bluetooth® 4.2 Dual-Mode
Module which enables you to easily add classic Bluetooth
and Bluetooth Low Energy (BLE) capability to your
products. Delivering local connectivity for the Internet of
Things (IoT), the RN4678 bridges the end application to
smartphones and tablets for convenient data transfer,
control and access to cloud applications.
This Bluetooth SIG-certified module provides a complete
wireless solution with Bluetooth stack on board,
integrated antenna and worldwide radio certifications in
a compact surface-mount 22 × 12 × 2.4 mm package.
It supports GAP, SDP, SPP and GATT profiles. Data is
transferred over the Bluetooth link by sending/receiving
data via transparent UART mode, making it easy to
integrate with any processor or microcontroller with a
UART interface. Configuration is made easy through ASCII
commands via UART.
The RN4678 enables rapid product development and faster
time to market, and is designed to provide designers with:
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Simple integration and programming
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Reduced development time
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Interoperability with Bluetooth host
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Wide range of applications
The RN4678 is a complete and fully-certified module
with integrated ceramic chip antenna and RF shield. The
RN4678U is a low-cost alternative with RF pad (for external
antenna) and no RF shield. Low-power usage and flexible
power management maximize the lifetime of both the
RN4678 and RN4678U module in battery-operated devices.
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Applications
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Internet of Things (IoT)
LED lighting
Wearables
Secure payment
Fitness devices
Healthcare/medical
Automotive accessories
Home automation
Remote control toys
Features
Fully certified Bluetooth 4.2 Module
Bluetooth Classic and Bluetooth Low Energy support
Easy-to-use RN-style ASCII interface
On-board embedded Bluetooth stack (GAP SDP SPP GATT)
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Easy-to-use transparent mode for data transfer via UART
Multiple I/O pins for control and status
Supports Apple® iPod® Accessory Protocol (iAP2)
(RN4678APL only)
Secure AES128 encryption
+2 dBm transmit power
Receiver sensitivity −90 dBm (classic); −92 dBm (BLE)
Firmware is field upgradable via UART
Compact surface-mount module: 22 × 12 × 2.4 mm
Temperature range from −20°C to +70°C
Operating voltage: 3.3–4.2V
Bluetooth SIG certified
Worldwide regulatory certifications
Development Tools
RN4678 Bluetooth 4.2 Dual-Mode PICtail™/PICtail
Plus Daughter Board (RN-4678-PICtail)
The RN4678 PICtail/PICtail Plus
Daughter Board provides rapid
prototyping and developing for
Bluetooth data applications for
Classic Serial Port Profile (SPP)
or Bluetooth Low Energy. It is
powered via USB host or external
battery. This daughter board
utilizes the RN4678 module, a fully
certified Bluetooth 4.2 dual-mode RF module supporting
Bluetooth Classic SPP and Bluetooth Low Energy, to
provide a Bluetooth serial data connection. It also provides
a USB-to-UART converter allowing a flexible interface to
the host PC, a PC terminal utility and smartphone apps to
drive both classic SPP and BLE data connections.
Block Diagram
RN4678/RN4678U BT 4.2 Dual-Mode Module
BAT_IN
SW_BTN
LDO33_O
LDO18_O
VDD_IO
RST_N
(Only RN4678U)
Antenna
Matching
PMU
BAT_DET
SW_BTN
LDO3V3_OUT
LDO1V8_OUT
VDDIO
RST_N
IS1678 S/SM
Bluetooth
®
Baseband
& RF
16 MHz
CRYSTAL
Core
320 KB ROM
28 KB SRAM
WAKEUP
WAKEUP
MCU
LED DRIVER
LED
GPIO
4 MB Flash
(Only IS1678SM)
UART
TXD
RXD
SCL
SDA
HOST
MCU
I
2
C
RTS
CTS
EEPROM
Ordering Information
Part Number
RN4678-V/RM100
RN4678APL-V/RM100
RN4678U-V/RM100
Description
Bluetooth® 4.2 Dual-Mode Module with easy-to-use ASCII interface
Bluetooth 4.2 Dual-Mode Module with easy-to-use ASCII interface, iAP compatible
Bluetooth 4.2 Dual-Mode module with easy-to-use ASCII interface, no shield
www.microchip.com/RN4678
Visit our web site for additional product information and to locate your local sales office.
Microchip Technology Inc. • 2355 W. Chandler Blvd. • Chandler, AZ 85224-6199
The Microchip name and logo and the Microchip logo are registered trademarks and PICtail is a trademark of Microchip Technology Incorporated in the U.S.A. and other countries. All other trademarks mentioned
herein are property of their respective companies. © 2016, Microchip Technology Incorporated. All Rights Reserved. Printed in the U.S.A. 10/16
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