RNBD451 datasheet(11/67 Pages) MICROCHIP

11 / 67 page

RNBD451

Device Overview

and its subsidiaries

Advance Information Data Sheet

DS70005514A-page 11

...........continued

Function

Name

Description

PA3

RSSI

indication

• Use this indication pin to indicate the quality of the link based on the RSSI level.

• If the RSSI level is lower than the specified threshold value, then the RSSI indication

pin goes low.

PA2

UART TX

indication

• UART TX indication is an output pin. Provides indication if the RNBD451 module is

transmitting to host MCU over UART.

• Pulled low before UART TX begins and pulled high after UART TX is over.

Table 3-3. Status Indication Pins

BT_Status_Ind1 (PB3)

BT_Status_Ind2 (PB7)

RNBD451 Status

Low

Bluetooth Low Energy is disconnected

Data transmission channel is closed

High

Low

Bluetooth Low Energy is connected

Data transmission channel is closed

High

Bluetooth Low Energy is connected

Data transmission channel is opened

Low

High

MCU DFU mode (local or Over-the-air

Profile Client (OTAPC))

Note: By default the Bluetooth status indication feature is disabled in the firmware. The user can enable this

feature via SR,<hex16> command. For example, SR,1000. For more details, refer to the RNBD451 Bluetooth Low

Energy Module User’s Guide (DS50003467).

3.3

Device Power Modes

The RNBD451 module incorporates a Power Management Unit (PMU) that provides both DC-DC (Buck) and MLDO

power conversion. On power-up, the RNBD451 module operates in MLDO mode. The RNBD451 module command

set provides the option to set the PMU mode as MLDO mode or BUCK PWM mode via Set PMU Mode command.

For example, SPMU,<0,1>.

The RNBD451 module supports the following device power modes:

• Run mode – In the Run mode, the CPU is actively executing code. Run mode provides normal operation of the

processor. All the features and configurations are available to be controlled.

• Sleep/Standby mode – In this mode, the RNBD451 module operates with minimum power consumption.

Upon entering this mode, the RNBD451 module enters into minimal power consumption state in between the

advertisement interval. After establishing the connection, then in between the connection interval, the RNBD451

module enters into minimal power consumption state and only consumes less power. Every connection/

advertising interval, the RNBD451 module wakes up from Sleep/Standby Sleep mode, performs the Bluetooth

low energy activity and goes back to sleep. In this mode, the overall average power consumption of the system

is always less in comparison to the module in Run mode.

Use the Low Power Control command to configure the RNBD451 module into Sleep mode or Low-power

Control mode. For example, SO,<0,1>.

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

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

make the RNBD451 module ready to receive data.

• Deep Sleep mode – In this mode, configure the RNBD451 module to operate with less power consumption

compared to Sleep/Standby mode. The Deep Sleep mode feature is incorporated only for advertisement. After

RNBD451 Datasheet(PDF) 11 Page - Microchip Technology

RNBD451 Datasheet(HTML) 11 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67

Datasheet Download

Link URL