3.1 Module Overview

The RNBD350 Bluetooth® Low Energy Module integrates the Bluetooth 5.2 baseband controller, Bluetooth stack, digital and analog I/O and RF power amplifier into one solution.

Figure 3-1. RNBD350 Module Block Diagram

Figure 3-2. Pin Diagram – RNBD350 Module

Table 3-1. Pinout and Signal Descriptions List
Pin#	RNBD350 Module Pin	RNBD350 Pin Definition	Type
1	GND	Ground	—
2	NMCLR	Reset	—
3	PA4	UART Request to Send (RTS)	O
4	VDD_A	AVDD Power Supply Input	—
5	GND	Ground	—
6	PA11/SOSCI	Reserved. No Connect	—
7	PA12/SOSCO	Reserved. No Connect	—
8	Ground	GND	—
9	PB5⁽¹⁾	Bluetooth® status LED	O
10	PA3⁽¹⁾	PTA control (BT_ACTIVE)	O
11	PB4⁽¹⁾	UART transmit indication pin	O
12	PB6	UART receive data	I
13	PB8⁽¹⁾	Bluetooth Low Energy status indication pin 2/2	O
14	PB9	UART receive indication pin/RNBD350 wake-up pin Low-power mode	I
15	PB7	Dedicated ADC pin for Host MCU to query ADC value	I
16	VDD	VDD power supply input	—
17	VDD	VDD power supply input	—
18	GND	Ground	—
19	PA5	UART transmit data	O
20	PA6	UART Clear to Send (CTS)	I
21	GND	Ground	—
22	PA9⁽¹⁾	PTA control (BT_PRIORITY)/UART mode switch	O
23	PA10⁽²⁾	Bluetooth Low Energy status indication pin 1/2	O
24	PA8⁽²⁾	PTA control (WLAN ACTIVE)	I
25	PA7	Debug UART receive data	O
26	NC	No Connect	—
27	GND	Ground	—
28	NC	No Connect	—
29	NC	No Connect	—
30	NC	No Connect	—
31	EP_PAD	Ground	—
Note: The priority of the PTA function is higher than that of the mode switch function. The priority of the PTA function is higher than that of the event indicator function.