Functional Description

[中文版]

Default Configuration

Name

FSC-BT618

UART Baudrate

115200/8/N/1

GPIO Indications

LED

PIN

Status

Description

PIN 32

1 Hz square wave

Bluetooth disconnected

PIN 32

High Level

Bluetooth connected

BT Connection Status

PIN

Status

Description

PIN 33

Low Level

Bluetooth Disconnected

PIN 33

High Level

Bluetooth Connected

Working Mode

Throughput Mode

  • Bluetooth Not Connected: Data received via UART is parsed as AT commands.

  • Bluetooth Connected: All data received via UART is sent as-is to the remote Bluetooth device.

Command Mode

  • Bluetooth Not Connected: Data received via UART is parsed as AT commands.

  • Bluetooth Connected: Data received via UART is still parsed as AT commands. Data must be sent to the remote device using AT commands, e.g., AT+LESEND.

GATT Service

Type

UUID

Operation

Description

Service

0xFFF0

Throughput transmission service

Write

0xFFF2

Write,
Write Without Response

APP to module

Notify

0xFFF1

Notify

Module to APP

Performance Parameters

Type

Time

Description

Power-On Time

230ms

UART response enable time

Wake-Up Time

200ms

Calculation starts after the UART finishes sending wake-up data

Data Rate (Typical)

Baudrate

Data Packet

Transmission Interval

Connection Interval

Transmission Mode

Rate

230400

244

11ms

15ms

Notify

23000 Byte/s

Low-Power Mode

FSC-BT618x module supports two Low Power Modes (LPM): UART Wake-up Mode and I/O Pin Wake-up Mode.

The low power function can be enabled or disabled via the AT command AT+LPM{=Param}.

Low-Power Mode Operation Strategy

  • UART Wake-up Mode

    • Configuration Command : AT+LPM=1

    • Hardware Connection : No need to connect WAKE_MCU and WAKE_BT.

    • Sleep Method :
      The module automatically enters sleep mode if there is no UART data communication for more than 5 seconds. It exits sleep mode when the first frame of data is received via UART after sleeping.

    • Derscription :
      The first frame of data upon wake-up will be lost; simple logic and IO resource-saving.

  • I/O Pin Wake-up Mode

    • Configuration Command : AT+LPM=2

    • Hardware Connection : Need to connect WAKE_MCU and WAKE_BT.

    • Sleep Method :
      When WAKE_BT is at high level, the Bluetooth module enters sleep mode.
      When WAKE_BT is at low level, the Bluetooth module exits sleep mode.
      WAKE_MCU at high level notifies the MCU to exit sleep mode.
      WAKE_MCU at low level notifies the MCU to enter sleep mode.

    • Derscription :

      Supports MCU wake-up.

      Requires 2 additional pin connections in the circuit.