RN4678
Bluetooth
®
Dual Mode Module
Features
• Bluetooth
®
Classic (BR/EDR) and Low Energy
(LE)
• Certified to FCC, ISED, MIC, KCC, NCC, and
SRRC Radio Regulations
• European Radio Equipment Directive (RED)
Assessed Radio Module
• Qualified for Bluetooth SIG v5.0 Core
Specification
• Transparent UART mode for seamless serial data
over Bluetooth Classic using Serial Port Profile
(SPP), and Bluetooth Low Energy (BLE) using
Generic Attribute (GATT) Profile
• Easily Programmable through ASCII Commands
and easily configurable with available PIC
®
MCU
driver library
• Firmware can be upgraded in the field over UART
(Flash version)
• Integral Chip Antenna (RN4678)
• Integrated Crystal, Internal Voltage Regulator, and
Matching Circuitry
• Available Configurable I/O Pins for Control or
Status Indication
• Supports Apple
®
iPod
®
Accessory Protocol
(iAP2) (only RN4678APL)
• Supports Bluetooth LE Secure Connections
• Bluetooth LE Data Packet Length Extension
• Small and Compact Surface Mount Module
• Castellated SMT Pads for easy and reliable PCB
mounting
• Ideal for Portable Battery-Operated Devices
MAC/Baseband/Higher Layer Features
• Secure AES128 Encryption
• Bluetooth Classic: GAP, SPP, SDP, RFCOMM and
L2CAP
• Bluetooth Low Energy: GAP, GATT, ATT, SMP
and L2CAP
Applications
•
•
•
•
•
•
Internet of Things (IoT)
Secure Payment
Home and Security
Health and Fitness
Industrial and Data Logger
LED Lighting (16 configurations)
Description
The RN4678 module is a fully certified, Bluetooth v5.0
compliant (BR/EDR/LE) dual mode module available
for customers to easily add dual mode Bluetooth
wireless capability to their products. The RN4678 is
built around Microchip's IS1678 Bluetooth dual mode
chip. Refer to
Section 8.0 “Ordering Information”.
The RN4678 provides a convenient method for cable
replacement for smartphones or tablets for data
transfer and control based on the Bluetooth protocols.
Data transfer is achieved through the Bluetooth link by
sending or receiving data through SPP in Bluetooth
(BT) Classic mode and through Transparent UART in
the BLE mode. The ASCII interface provides an easy
way to learn the operation and to integrate the module
with any microprocessor or Microcontroller (MCU) with
a UART interface.
RF/Analog
• Frequency: 2.402 GHz to 2.480 GHz
• RX Sensitivity: -90 dBm (BR/EDR), -92 dBm (LE)
• Class 2 Output Power (+1.5 dBm typical)
Data Throughput
Data Throughput at 1 Mbps UART Baud Rate:
• BR/EDR: up to 32 Kbytes/s
• LE: up to 7 Kbytes/s
Data Throughput at 115200 bps UART Baud Rate
• BR/EDR: up to 10 Kbytes/s
• LE: up to 6 Kbytes/s
Operating Conditions
• Operating Voltage Range: 3.3V to 4.2V
• Operating Temperature Range: -20°C to +70°C
2016-2019 Microchip Technology Inc.
DS50002519D-page 1
RN4678
Table of Contents
1.0 Device Overview .......................................................................................................................................................................... 3
2.0 Application Information ................................................................................................................................................................. 7
3.0 Electrical Characteristics ............................................................................................................................................................ 15
4.0 Radio Characteristics ................................................................................................................................................................. 19
5.0 Physical Dimensions .................................................................................................................................................................. 21
6.0 Reflow profile.............................................................................................................................................................................. 25
7.0 Module Placement...................................................................................................................................................................... 27
8.0 Ordering Information .................................................................................................................................................................. 31
9.0 Regulatory Approval ................................................................................................................................................................... 33
Appendix A: Revision History .............................................................................................................................................................. 39
The Microchip WebSite ........................................................................................................................................................................ 41
Customer Change Notification Service ................................................................................................................................................ 41
Customer Support ................................................................................................................................................................................ 41
Product Identification System............................................................................................................................................................... 43
TO OUR VALUED CUSTOMERS
It is our intention to provide our valued customers with the best documentation possible to ensure successful use of your Microchip
products. To this end, we will continue to improve our publications to better suit your needs. Our publications will be refined and
enhanced as new volumes and updates are introduced.
If you have any questions or comments regarding this publication, please contact the Marketing Communications Department via
E-mail at
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We welcome your feedback.
Most Current Data Sheet
To obtain the most up-to-date version of this data sheet, please register at our Worldwide Web site at:
http://www.microchip.com
You can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page.
The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000).
Errata
An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for current
devices. As device/documentation issues become known to us, we will publish an errata sheet. The errata will specify the revision
of silicon and revision of document to which it applies.
To determine if an errata sheet exists for a particular device, please check with one of the following:
• Microchip’s Worldwide Web site;
http://www.microchip.com
• Your local Microchip sales office (see last page)
When contacting a sales office, please specify which device, revision of silicon and data sheet (include literature number) you are
using.
Customer Notification System
Register on our web site at
www.microchip.com
to receive the most current information on all of our products.
DS50002519D-page 2
2016-2019 Microchip Technology Inc.
RN4678
1.0
DEVICE OVERVIEW
The RN4678 module is a fully certified, embedded
Bluetooth (BR/EDR/LE) wireless module. The module
includes an on-board Bluetooth stack, power
management subsystem, a 2.4 GHz transceiver, and
RF power amplifier. Customers can embed Bluetooth
functionality into any application using the RN4678
module.
The RN4678 enables rapid product development and
faster time to market, and it is designed to provide
integrators with the following features:
•
•
•
•
•
Simple integration and programming
Reduced development time
Superior wireless module with low-cost system
Interoperability with Bluetooth host
Wide range of applications
The RN4678 is a complete and fully regulatory certified
module with an integral ceramic chip antenna and RF
shield.
The RN4678 is a small, compact and surface mounted
module with castellated pads for easy and reliable host
PCB mounting. The module is compatible with
standard pick-and-place equipment and can
independently maintain a low-power wireless
connection. Low-power usage and flexible power
management maximize the lifetime of the RN4678
module in battery-operated devices. A wide operating
temperature range enables its applications in indoor
and outdoor environments.
Figure 1-1
illustrates the internal block diagram of the
RN4678 module.
FIGURE 1-1:
RN4678 INTERNAL BLOCK DIAGRAM
RN4678 BT Dual Mode Module
BAT_ IN
SW_ BTN
PMU
BAT_ DET
Matching
Antenna
SW_ BTN
LDO3V3_OUT
LDO33_O
LDO18_O
VDD_IO
RST_N
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
4 Mb Flash
(Only IS1678SM)
GPIO
TXD
RXD
UART
RTS
CTS
HOST
MCU
EEPROM
2016-2019 Microchip Technology Inc.
DS50002519D-page 3
RN4678
Table 1-1
provides the description of the various pins of the RN4678 module.
TABLE 1-1:
RN4678
1
2
3
4
PIN DESCRIPTION
Pin Name
GND
GND
GND
BAT_IN
Type
Power
Power
Power
Power
Ground reference
Ground reference
Ground reference
Battery Input (3.3V to 4.2V)
Main positive supply input
Connect to 10 µF (X5R/X7R) capacitor
• Software Button
- H: Power On
- L: Power Off
• By default, this functionality is disabled. Refer to
RN4678 Com-
mand Reference User Guide
(DS50002506) to enable the feature
Internal 3.3V LDO output; can source no more than 50 mA
I/O positive supply input.
For internal use only;
do
not
connect to other
devices.
Internal 1.8V LDO output.
For internal use only;
do
not
connect to other
devices.
Wake-up from Sleep mode (active-low) (internal pull-up)
Power management unit output.
For internal use only;
do
not
connect
to other devices.
Status Indication pin. Indicates the current status of BLE data
transmission.
High: Data currently transmitting
Low: No current data transmission
Status Indication pin. Indicates the current connection status.
High: Powered On and not connected
Low: Connected to peer device
GPIO pin. Internally pulled-up by default.
GPIO pin. Internally pulled-up by default.
Configurable Control or Indication pin or UART CTS (input)
Configurable Control or Indication pin
Configurable Control or Indication pin or UART RTS (output)
System configuration pin. Along with P2_4 and EAN pins, used to set
the module in any of the following three modes: Application mode (for
normal operation), Test mode (to change EEPROM values), and Write
Flash mode (to enter the new firmware into the module); refer to
Table 2-1.
System configuration pin. Along with P2_0 and EAN pins, used to set
the module in any of the following three modes: Application mode (for
normal operation), Test mode (to change EEPROM values), and Write
Flash mode (to enter new firmware into the module); refer to
Table 2-1.
External address-bus negative pin. System configuration pin along with
P2_0 and P2_4 pins, used to set the module in any of the following
three modes: Application mode (for normal operation), Test mode (to
change EEPROM values), and Write Flash mode (to enter new
firmware into the module); refer to
Table 2-1.
Must be pulled down with 4.7 k to GND.
Module Reset (internal pull-up). Apply a pulse of at least 63 ns.
UART data input
Description
5
SW_BTN
DI
6
7
8
9
10
11
LDO33_O
VDD_IO
LDO18_O
WAKEUP
PMULDO_O
P0_4
Power
Power
Power
DI
Power
DO
12
P1_5
DO
13
14
15
16
17
18
P1_2
P1_3
P1_7/CTS
P0_5
P0_0/RTS
P2_0
DO
DIO
DIO
DIO
DIO
DI
19
P2_4
DI
20
EAN
DI
21
22
RST_N
RXD
DI
DI
DS50002519D-page 4
2016-2019 Microchip Technology Inc.
RN4678
TABLE 1-1:
RN4678
23
24
25
26
27
28
29
30
31
—
32
33
PIN DESCRIPTION (CONTINUED)
Pin Name
TXD
P3_1
P3_2
P3_3
P3_4
P3_6
P3_7
LED
GND
BT_RF
GND
GND
Type
DO
DIO
DIO
DIO
DIO
DIO
DIO
DO
Power
AIO
Power
Power
D = Digital
UART data output
Configurable Control or Indication pin (Internally pulled-up, if configured
as an input)
Configurable Control or Indication pin (Internally pulled-up, if configured
as an input)
Configurable Control or Indication pin (Internally pulled-up, if configured
as an input)
Configurable Control or Indication pin (Internally pulled-up, if configured
as an input)
Do
not
connect.
Configurable Control or Indication pin (Internally pulled-up, if configured
as an input)
Status LED, connect to LDO33_0
Ground reference
External antenna connection (50 ohms)
Ground reference
Ground reference
Description
Legend:
A = Analog
I = Input O = Output
Figure 1-2
illustrates the pin diagram of the RN4678 module.
FIGURE 1-2:
RN4678 PIN DIAGRAM
GND 1
33 GND
GND 2
32 GND
GND 3
BAT_IN 4
SW_BTN 5
LDO33_O 6
31 GND
30 LED
29 P3_7
28 P3_6
27 P3_4
26 P3_3
25 P3_2
24 P3_1
23 TXD
22 RXD
VDD_IO 7
LDO18_O 8
WAKEUP 9
PMULDO_O 10
P0_4 11
P1_5 12
P1_2 13
P1_3 14
P0_5 16
P0_0/RTS 17
P2_4 19
P2_0 18
P1_7/CTS 15
EAN 20
2016-2019 Microchip Technology Inc.
RST_N 21
DS50002519D-page 5
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