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Table Of Contents

 2016-2019 Microchip Technology Inc. DS50002519D-page 1

RN4678

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

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

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.

Bluetooth

Dual Mode Module

Summary of content (45 pages)

PAGE 1
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.
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RN4678 Table of Contents 1.0 Device Overview .......................................................................................................................................................................... 3 2.0 Application Information ................................................................................................................................................................. 7 3.0 Electrical Characteristics .......................................................................
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RN4678 1.0 DEVICE OVERVIEW The RN4678 is a complete and fully regulatory certified module with an integral ceramic chip antenna and RF shield. 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.
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RN4678 Table 1-1 provides the description of the various pins of the RN4678 module. TABLE 1-1: PIN DESCRIPTION RN4678 Pin Name Type Description 1 GND Power Ground reference 2 GND Power Ground reference 3 GND Power Ground reference 4 BAT_IN Power Battery Input (3.3V to 4.2V) Main positive supply input Connect to 10 µF (X5R/X7R) capacitor 5 SW_BTN DI 6 LDO33_O Power Internal 3.3V LDO output; can source no more than 50 mA 7 VDD_IO Power I/O positive supply input.
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RN4678 TABLE 1-1: PIN DESCRIPTION (CONTINUED) RN4678 Pin Name Type Description 23 TXD DO UART data output 24 P3_1 DIO Configurable Control or Indication pin (Internally pulled-up, if configured as an input) 25 P3_2 DIO Configurable Control or Indication pin (Internally pulled-up, if configured as an input) 26 P3_3 DIO Configurable Control or Indication pin (Internally pulled-up, if configured as an input) 27 P3_4 DIO Configurable Control or Indication pin (Internally pulled-up, if c
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RN4678 NOTES: DS50002519D-page 6  2016-2019 Microchip Technology Inc.
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RN4678 2.0 APPLICATION INFORMATION 2.1 Module Configuration the RN4678, the CTS (RN4678 input pin) must be pulled high. The RN4678 pulls the RTS pin (output pin) low to indicate that it can accept data. 2.3 For the I/O pins, P2_0, P2_4 and EAN, place the RN4678 into Operating mode. Each of these pins have internal pull-up and allow configuration settings and firmware to be updated from UART. Table 2-1 provides system configuration details. 2.
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RN4678 Function Name Description UART RX Indication Use this pin to enable communication with the UART when the module is in Low-Power mode. When not in Low-Power mode, the module runs on a 16 MHz clock. If Low-Power mode is enabled on the module by using command SO,1, the module runs on a 32 kHz clock thus reducing power consumption. However, in Low-Power mode, the host MCU cannot communicate with the module via the UART since the UART is not operational.
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RN4678 2.5 Software Button (SW_BTN) Figure 2-2 through Figure 2-4 show the timing diagrams for the RN4678 with regard to the SW_BTN and the other relevant pins in different states of the module. The Software Button (SW_BT) pin powers the main sections of the module into operation. If the SW_BTN pin is low, the module is turned OFF. After turning the module ON via the SW_BTN, the host MCU must wait for specific time before sending the first command.
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RN4678 FIGURE 2-3: SW_BTN TIME (LOW) AT ACCESS STATES(1) BAT_IN SW_BTN 12 ms RST_N LDO33_O 140 ms Note 1: Reset pin is not connected. FIGURE 2-4: SW_BTN TIME (LOW) AT LINK STATES(1,2) BAT_IN SW_BTN RST_N LDO33_O 830 ms 140 ms Note 1: 830 ms time duration is a typical value measured on iPhone® 6 and this time duration can vary from one smartphone to another. 2: Reset pin is not connected. DS50002519D-page 10  2016-2019 Microchip Technology Inc.
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RN4678 2.6 WAKE-UP The WAKEUP input pin wakes the RN4678 module from Deep-Sleep mode. The WAKEUP pin is activelow and puts module in Standby mode. Figure 2-5 illustrates the timing diagram of the RN4678 in the Wake-Up mode. FIGURE 2-5: WAKE-UP TIME(1) WAKE UP P0_4 P1_5 85ms Note 1: The 85 ms is for reference time. Use the Status Indication pins to verify the exact results. 2.7 External Reset The RN4678 provides an External Reset pin which resets the module. The Reset pin, RST_N, is activelow.
PAGE 12
RN4678 2.8 LED Driver The following are the LED status indications. Each indication is a configurable flashing sequence: The RN4678 has a dedicated LED driver and the LED can be connected directly to this pin as shown in Figure 2-7. The maximum current sourcing for the LED is 5 mA. The brightness of this LED can be configured via an ASCII command. • • • • • FIGURE 2-7: 2.
PAGE 13
Reference Circuit Figure illustrates the reference schematic of the power supply design implemented for the RN4678.
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RN4678 NOTES: DS50002519D-page 14  2016-2019 Microchip Technology Inc.
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RN4678 3.0 ELECTRICAL CHARACTERISTICS This section provides an overview of the electrical characteristics of the RN4678 module. Additional information is provided in future revisions of this document as it becomes available. Absolute maximum ratings for the RN4678 devices are listed below. Exposure to these maximum rating conditions for extended periods may affect device reliability.
PAGE 16
RN4678 Table 3-1 through Table 3-7 provide the recommended operating conditions and the electrical specifications of the module. TABLE 3-1: RECOMMENDED OPERATING CONDITIONS Rating Min. Typical Max. Ambient Operating Temperature Range -20ºC +25ºC +70ºC Relative Humidity (Operating) 10% — 90% Relative Humidity (Storage) 10% — 90% ESD HBM — ±2 KV — MM — ±200V — (1) HTOL — 1000 hrs — Supply Voltage: BAT_IN 3.3V — 4.2V Supply Voltage: 1V8, VCC_RF, VDD_XO, AVDD_SAR 1.8V 1.
PAGE 17
RN4678 TABLE 3-4: SAR-ADC AND BATTERY VOLTAGE DETECTOR Parameter Min. Typical Max. Unit -20 — +70 ºC AVDD_SAR Power Supply — 1.8 — V SAR_BAT Detection(1) 3.3 — 4.2 V Resolution — 10 — bit Operating Current (including bandgap) — — 1 mA 1 µA Operating Temperature Deep-Sleep Current — — Note 1: SAR_BAT is connected with BAT_IN internally for battery voltage detection. TABLE 3-5: INTENSITY CONTROLLABLE LED DRIVER Parameter Min. Typical Max.
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RN4678 TABLE 3-7: POWER CONSUMPTION-LOW ENERGY(1,2) Test Condition Current Consumption (avg.) (mA) Remarks Deep-Sleep mode 0.28 — LE fast advertising 2.09 LE fast advertising interval = 100 ms 1.51 LE fast advertising interval = 160 ms 0.63 LE fast advertising interval = 500 ms 2.75 LE fast advertising interval = 100 ms + Beacon 100 ms 0.83 LE fast advertising interval = 500 ms + Beacon 500 ms 0.62 LE Reduced Power advertising interval = 961 ms 1.
PAGE 19
RN4678 4.0 RADIO CHARACTERISTICS Table 4-1 provides the transmitter performance characteristics of the RN4678 module. TABLE 4-1: TRANSMITTER PERFORMANCE (1,2) Min. Typical Max. Bluetooth Specification BDR power — 1.5 — -6 ~ +4 EDR (2M/3M) power — -1 — -6 ~ +4 LE power — 0.5 — -20 ~ +10 Unit dBm Note 1: The RF Transmit power can be calibrated during production by using the MP Tool software and the MT8852 Bluetooth Test equipment. 2: Test condition: VCC RF = 1.80V, temperature = 25ºC.
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RN4678 NOTES: DS50002519D-Page 20  2016-2019 Microchip Technology Inc.
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RN4678 5.0 PHYSICAL DIMENSIONS Figure 5-1 illustrates the physical dimensions of the RN4678 module. RN4678 MODULE DIMENSIONS 1 33 10.2 (Bottom View) 22.0 21.2 20.1 21.5 19.9 18.0 18.95 17.3 18.0 16.95 shield mounting hole 14.90 13.9 12.8 11.7 10.6 9.5 8.4 7.3 6.2 5.1 4.0 2.9 1.8 13.9 12.8 11.7 10.6 9.5 8.4 7.3 6.2 5.1 4.0 2.9 1.8 1.0mm 0.7mm (Bottom View) 1.1mm 0.7 0.0 0.0 0.0 0.7mm 9.3 8.2 7.1 6.0 4.9 3.8 2.7 0.5mm Dimentions are in millimeters Tolerances: 2.4 0.6 0.0 11.
PAGE 22
RN4678 Figure 5-2 illustrates the recommended host PCB foot print. FIGURE 5-2: RN4678 RECOMMENDED PCB FOOTPRINT 11.2 9.2 2.0 (Top View) 22.0 Top Copper 21.2 Keep Out Area 20.1 18.0 18.0 16.0 0.5mm 1.5mm 13.9 12.8 11.7 10.6 9.5 Silkscreen area 8.4 7.3 0.7mm 6.2 5.1 1.1mm 4.0 2.9 1.8 DS50002519D-Page 22 12.0 2.7 3.8 4.9 6.0 7.1 8.2 9.3 0.0 0.0  2016-2018 Microchip Technology Inc.
PAGE 23
RN4678 Figure 5-3 illustrates the recommendations for mounting the RN4678 on the host PCB, and also shows the minimum ground plane area to the left and right of the module for the best antenna performance. Avoid top copper layer near the test pin area. When designing the host PCB, the areas under the antenna must not contain any top, inner or bottom copper layer. FIGURE 5-3: A low-impedance ground plane ensures best radio performance (best range and lowest noise).
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RN4678 NOTES: DS50002519D-Page 24  2016-2018 Microchip Technology Inc.
PAGE 25
RN4678 6.0 REFLOW PROFILE The RN4678 is highly recommended to be assembled using a standard lead-free reflow profile, IPC/JEDEC J-STD-020. The RN4678 can be soldered to the host PCB by using the standard leaded and lead-free solder reflow profile. To avoid damage to the module, follow these recommendations: • Follow solder reflow recommendations provided in Microchip Technology Application Note AN233 Solder Reflow Recommendation (DS00233).
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RN4678 NOTES: DS50002519D-Page 26  2016-2019 Microchip Technology Inc.
PAGE 27
RN4678 7.0 MODULE PLACEMENT For a Bluetooth wireless product, the antenna placement affects the performance of the whole system. The antenna requires free space to radiate the RF signal and it cannot be surrounded by the ground plane. Microchip recommends that the areas underneath the antenna on the host PCB must not contain copper on top, inner or bottom layer. Figure 7-1 illustrates an example of good and poor antenna placement on a host PCB with ground plane.
PAGE 28
RN4678 Figure 7-2 illustrates the RN4678 module mounted on the RN4678 Evaluation Board (EVB). It also shows the recommended keep out area for the antenna. FIGURE 7-2: Note: KEEP OUT AREA RECOMMENDED FOR ANTENNA For additional information on free space for antenna placement design, refer to the design rule document of the antenna manufacturer. DS50002519D-Page 28  2016-2019 Microchip Technology Inc.
PAGE 29
RN4678 7.1 RN4678 Ceramic Chip Antenna The RN4678 contains an integral ceramic chip antenna. Figure 7-3 illustrates the antenna radiation pattern of the ceramic chip antenna on the RN4678. FIGURE 7-3: RN4678 ANTENNA RADIATION PATTERN Parameter Values Frequency 2450 MHz Peak Gain 1.63 dBi Efficiency 71.55%  2016-2019 Microchip Technology Inc.
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RN4678 NOTES: DS50002519D-Page 30  2016-2019 Microchip Technology Inc.
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 2016-2019 Microchip Technology Inc. 8.0 ORDERING INFORMATION Table 8-1 provides ordering information for the RN4678 module.
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RN4678 NOTES: DS50002519D-Page 32  2016-2019 Microchip Technology Inc.
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RN4678 9.0 REGULATORY APPROVAL This section outlines the regulatory information for the RN4678 module for the following countries: • • • • • • • United States Canada Europe Japan Korea Taiwan Other Regulatory Jurisdictions 9.1 United States The RN4678 module has received Federal Communications Commission (FCC) CFR47 Telecommunications, Part 15 Subpart C “Intentional Radiators” singlemodular approval in accordance with Part 15.212 Modular Transmitter approval.
PAGE 34
RN4678 9.1.2 RF EXPOSURE All transmitters regulated by FCC must comply with RF exposure requirements. KDB Publication 447498 General RF Exposure Guidance provides guidance in determining whether proposed or existing transmitting facilities, operations or devices comply with limits for human exposure to Radio Frequency (RF) fields adopted by the Federal Communications Commission (FCC). Output power listed is conducted.
PAGE 35
RN4678 The device operates at an output power level which is within the ISED SAR test exemption limits at any user distance. 9.2.3 HELPFUL WEB SITES Innovation, Science and Economic Development Canada (ISED): http://www.ic.gc.ca/ 9.3 The ETSI provides guidance on modular devices in “Guide to the application of harmonised standards covering articles 3.1b and 3.2 of the RED 2014/53/EU (RED) to multi-radio and combined radio and non-radio equipment” document available at www.etsi.org.
PAGE 36
RN4678 9.3.3 HELPFUL WEBSITES A document that can be used as a starting point in understanding the use of Short Range Devices (SRD) in Europe is the European Radio Communications Committee (ERC) Recommendation 70-03 E, which can be downloaded from the European Communications Committee (ECC) at: http://www.ecodocdb.dk/ The RN4678 module is labeled with its own technical conformity mark and certification number.
PAGE 37
RN4678 9.6 Taiwan The RN4678 module has received compliance approval in accordance with the Telecommunications Act. Customers seeking to use the compliance approval in their product must contact Microchip Technology sales or distribution partners to obtain a Letter of Authority. Integration of this module into a final product does not require additional radio certification provided installation instructions are followed and no modifications of the module are allowed. 9.6.
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RN4678 NOTES: DS50002519D-page 38  2016-2019 Microchip Technology Inc.
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RN4678 APPENDIX A: REVISION HISTORY Revision A (June 2016) This is the initial released version of the document. Revision B (January 2018) • • • • • Updated Figure 1-1, Figure 1-2, and Figure 5-3. Updated Table 1-1. Added Section 2.2 “Flow Control”. Updated Section 8.0 “Ordering Information” Updated Section “Product Identification System” • Removed Figure 1-3, Figure 2-9, Figure 5-4,  Figure 5-5, and Figure 5-6.
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RN4678 NOTES: DS50002519D-page 40  2016-2019 Microchip Technology Inc.
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RN4678 THE MICROCHIP WEBSITE CUSTOMER SUPPORT Microchip provides online support via our WWW site at www.microchip.com. This website is used as a means to make files and information easily available to customers.
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RN4678 NOTES:  2015-2019 Microchip Technology Inc.
PAGE 43
RN4678 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, for example, on pricing or delivery, refer to the factory or the listed sales office. V PART NO. Temperature Range Device RM XXX Package Firmware Revision Number Device: RN4678: Temperature Range: V = -20C to Package: RM = Radio Module DS50002519D-page 43 Example: RN4678-V/RM100: Various temperature Ceramic Chip Antenna +70C (Various)  2016-2019 Microchip Technology Inc.
PAGE 44
Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature.
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