Datasheet

RN4678
DS50002519D-page 4  2016-2019 Microchip Technology Inc.
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 • 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
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. For internal use only; do not connect to other
devices.
8 LDO18_O Power Internal 1.8V LDO output. For internal use only; do not connect to other
devices.
9 WAKEUP DI Wake-up from Sleep mode (active-low) (internal pull-up)
10 PMULDO_O Power Power management unit output. For internal use only; do not connect
to other devices.
11 P0_4 DO Status Indication pin. Indicates the current status of BLE data
transmission.
High: Data currently transmitting
Low: No current data transmission
12 P1_5 DO Status Indication pin. Indicates the current connection status.
High: Powered On and not connected
Low: Connected to peer device
13 P1_2 DO GPIO pin. Internally pulled-up by default.
14 P1_3 DIO GPIO pin. Internally pulled-up by default.
15 P1_7/CTS DIO Configurable Control or Indication pin or UART CTS (input)
16 P0_5 DIO Configurable Control or Indication pin
17 P0_0/RTS DIO Configurable Control or Indication pin or UART RTS (output)
18 P2_0 DI 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.
19 P2_4 DI 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
Ta bl e 2-1.
20 EAN DI 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
Ta bl e 2-1.
Must be pulled down with 4.7 k to GND.
21 RST_N DI Module Reset (internal pull-up). Apply a pulse of at least 63 ns.
22 RXD DI UART data input