The MIKROE-2545 RN4678 Click Board integrates the RN4678 Bluetooth 4.2 dual mode module from Microchip. It is designed to run on a 3.3V power supply. It communicates with the target microcontroller over I2C and UART interface, with additional functionality provided by the following pins on the mikroBUS line: AN, RST, CS, PWM, INT.
Key Features
Frequency: 2.402 GHz to 2.480 GHz, RX Sensitivity: -90 dBm (BR/EDR), -92 dBm (LE), Bluetooth SIG 4.2 Qualified

RN4678 Features

The RN4678 from Microchip is a fully certified, Bluetooth version 4.2 module. Use it to add Bluetooth wireless capability to your project.
The module includes an on-board Bluetooth stack, power management subsystem, 2.4 GHz transceiver, and RF power amplifier.
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 RN4678 contains an integral ceramic chip antenna.
The RN4678 module has strong AES128 Encryption. A 128-bit encryption is one of the most powerfull encryption algorithms. AES stands for Advanced Encryption Standard and it is a symmetric encryption algorithm.

RN4678 Click Board Pinouts

Jumper and Settings

Designator
Name
Default Position
Default Option
Description

JP1
P2_0
Left
HIGH
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)

JP2
P2_4
Left
HIGH
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)

JP3
EAN
Right
LOW
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);

Resources

Datasheet
RN4678 click example on Libstock
RN4678 click schematic
RN4678 datasheet