BM83 datasheet(41/74 Pages) MICROCHIP

41 / 74 page

Application Information

6.1

Host MCU Interface Over UART

The BM83 module supports UART commands, which enable an external MCU to control the BM83 module. The

following figure illustrates the UART interface between the BM83 module and an external MCU. An external MCU can

control the BM83 module over the UART interface and wake up the module with the MFB and P0_0 pins.

Refer to SPKcommandset tool to get a list of functions supported by the BM83 module and how to use the Config

Tool for configuring UART and UART command set tool.

Figure 6-1. Host MCU Interface Over UART

MCU

MCU_WAKE UP

UART_RX

UART_TX

BT_WAKE UP

P0_0

UART_TXD

UART_RXD

MFB

BM83

Note: For the latest SPKcommandset tool, refer to http://www.microchip.com/BM83.

The following figures illustrate the timing sequences of various UART control signals.

Figure 6-2. Power ON/OFF Sequence

BAT_IN

SYS_PWR

1 ms

Power-

on/initial

idle

Power-on

Power-off

idle

MCU state

PWR (MFB)

BK_OUT/LDO31_VO

400 ms

RST_N

MCU sends UART command

(UART_RX)

UART

Command

MCU sends power-

off UART Command

Power-on ACK

ACK

Bluetooth response UART state

(UART_TX)

any

10 ms

20 ms

Keep all Bluetooth

and MCU

connection to

low level

> 1s

BM83

Application Information

Preliminary Datasheet

DS70005402A-page 41

BM83 Datasheet(PDF) 41 Page - Microchip Technology

BM83 Datasheet(HTML) 41 Page - Microchip Technology

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