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Table Of Contents

Features
RF/Analog
Data Throughput
Operating Conditions
MAC/Baseband/Higher Layer Features
Applications
Description
Table of Contents
Most Current Data Sheet
Errata
Customer Notification System
1.0 Device Overview
- FIGURE 1-1: RN4678 Internal Block Diagram
- TABLE 1-1: PIN Description
- FIGURE 1-2: RN4678 PIN DIAGRAM
2.0 Application Information
- 2.1 Module Configuration
- 2.2 Flow Control
- 2.3 Control and Indication I/O Pins
- 2.4 Power Tree
  - FIGURE 2-1: Power Tree Diagram
- 2.5 Software Button (SW_BTN)
- 2.6 WAKE-UP
  - FIGURE 2-5: WAKE-UP TIME(1)
- 2.7 External Reset
  - FIGURE 2-6: TIMING WAVEFORMS ON RESET (1,2)
- 2.8 LED Driver
  - FIGURE 2-7: LED Driver
- 2.9 Host MCU Interface over UART
  - FIGURE 2-8: Power and MCU Interface Example for Rn4678
- 2.10 Reference Circuit
  - FIGURE 2-9: RN4678 Reference Circuit
3.0 Electrical Characteristics
- Absolute Maximum Ratings
4.0 Radio Characteristics
- TABLE 4-1: Transmitter Performance (1,2)
- TABLE 4-2: Receiver Performance(1)
5.0 Physical Dimensions
- FIGURE 5-1: RN4678 Module Dimensions
- FIGURE 5-2: RN4678 Recommended PCB Footprint
- FIGURE 5-3: RN4678 Host PCB Mounting Suggestion
6.0 Reflow profile
- FIGURE 6-1: Reflow Profile
7.0 Module Placement
- FIGURE 7-1: Module Placement Examples
- TABLE 7-1: Recommended Antenna
- FIGURE 7-2: Keep Out Area Recommended for Antenna
- 7.1 RN4678 Ceramic Chip Antenna
  - FIGURE 7-3: RN4678 Antenna Radiation Pattern
8.0 Ordering Information
- TABLE 8-1: Ordering Information
9.0 Regulatory Approval
- 9.1 United States
- 9.2 Canada
- 9.3 Europe
  - TABLE 9-1: EUROPEAN COMPLIANCE TESTING
- 9.4 Japan
- 9.5 Korea
- 9.6 Taiwan
- 9.7 China
- 9.8 Other Regulatory Information
Appendix A: Revision History
- Revision A (June 2016)
- Revision B (January 2018)
- Revision C (March 2019)
- Revision D (May 2019)
The Microchip WebSite
Customer Change Notification Service
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RN4678

DS50002519D-page 10  2016-2019 Microchip Technology Inc.

FIGURE 2-3: SW_BTN TIME (LOW) AT ACCESS STATES

(

)

Note 1: Reset pin is not connected.

FIGURE 2-4: SW_BTN TIME (LOW) AT LINK STATES

(

1,2

)

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.

SW_BTN

LDO33_O

RST_N

BAT_IN

140 ms

12 ms

SW_BTN

LDO33_O

RST_N

BAT_IN

140 ms

830 ms