RNBD451 datasheet(12/67 Pages) MICROCHIP

12 / 67 page

RNBD451

Device Overview

and its subsidiaries

Advance Information Data Sheet

DS70005514A-page 12

every advertising interval, the RNBD451 module wakes up from Deep Sleep mode, performs the advertisement

and goes back to Deep Sleep mode. The RNBD451 module continues this pattern of advertisement until a

connection is established.

Enable the deep sleep advertisement in the RNBD451 module using Set Deep Sleep Advertising

command. For example, SDO,<0,1>,<hex16>.

Pull the UART_RX_IND (PB4) pin to low from host MCU to enable the UART before Host MCU transmits data

to the RNBD451 module. The UART_RX_IND must be active prior to UART data more than 25 ms to make the

RNBD451 module ready to receive data.

• Extreme Deep Sleep mode – In this mode, configure the module to operate in Shutdown state. In this state,

the system stays in the Extreme Deep Sleep (XDS) mode and it consumes extreme low power. Hard reset or

pull UART_RX_IND pin low can bring the system back to Run mode. For more details on the commands for

different Low-power mode configurations, refer to the RNBD451 Bluetooth Low Energy Module User’s Guide

(DS50003467).

3.4

Device Programming

The RNBD451 device is available for purchase with a pre-programmed firmware. Microchip periodically releases the

firmware for fixing previously reported issues or to implement latest feature support. There are two ways to perform

regular firmware update:

Serial DFU command based update over UART

Over-the-air (OTA) update of firmware using Microchip Bluetooth Data (MBD) mobile application or module to

module OTA update (OTAPC mode commands)

Advanced programming

For advanced programming option (SWD), go to support.microchip.com.

Note: For the serial DFU and OTA programming guidance, refer to the RNBD451 Bluetooth Low Energy Module

User’s Guide (DS50003467).

RNBD451 Datasheet(PDF) 12 Page - Microchip Technology