Datasheet

 2016-2019 Microchip Technology Inc. DS50002519D-page 3
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
BAT_ IN
SW_ BTN
LDO3V3_OUT
LDO1V8_OUT
PMU
VDDIO
WAKEUP
LED DRIVER
EEPROM
UART
GPIO
IS1678 S/SM
16 MHz
CRYSTAL
Matching
Ant enna
RN4678 BT Dual Mode Module
HOST
MCU
SW_ BTN
LDO33_O
LDO18_O
RST_N
WA KEUP
BAT_ DET
Bluetooth
Baseband
& RF
TXD
RXD
RTS
CTS
VDD_IO
Core
320 KB ROM
28 KB SRAM
MCU
LE D
4 Mb Fla sh
(Only IS1678SM)
RST_N