PDDAXLQUE DX-BT24-T Bluetooth Module User Manual

1. Introduction

The PDDAXLQUE DX-BT24-T is an ultra-small, low-power Bluetooth module designed for various applications requiring wireless communication. It features the DA14531 BLE 5.1 chip, offering a communication range of up to 45 meters and a serial port transmission speed of up to 10K Bytes/s. This module supports UART serial communication and can be configured using AT commands, simplifying integration into your projects. Its ultra-low power consumption makes it suitable for battery-powered devices.

2. Key Features

• Ultra Mini Size
• Renesas DA14531 & BLE 5.1
• Communication Distance: 45m (open environment)
• Serial communication data transfer
• Abundant AT commands for configuration
• Transmission rate: Up to 10K Bytes/s
• Power consumption: As low as 2 µA (hibernation), 19 µA (working)
• Ceramic Antenna
• Module Size: 8.3(L) x 7.6(W) x 2.1(H) mm
• Transmit Power: -19.5 ~ +2.5dBm
• Working temperature: -40 ~ +85°C
• Complete developer profile
• Shield Protection: Antistatic & Dustproof
• Supports PC, iOS, Android transmission
• Certifications: CE, FCC, BQB, IC, SRCC, ROHS

Figure 2.1: DX-BT24-T Key Features and Dimensions. This image highlights the module's compact size, BLE 5.1 capability, communication range, data transfer rate, and power efficiency, along with its physical dimensions.

3. Product Overview

The DX-BT24-T is the smallest module in the BT24 series, designed for applications where space is critical. It integrates a ceramic antenna and offers robust performance within its compact form factor.

Figure 3.1: Top and bottom view of the DX-BT24-T module, showcasing its compact design and pin layout.

Figure 3.2: The DX-BT24-T module demonstrating its ultra-miniature size, highlighting its suitability for space-constrained designs.

3.1. BT24 Series Comparison

The DX-BT24 series offers various models with different form factors and communication ranges. The DX-BT24-T is the smallest, with a 45m communication distance.

4. Pin Definitions

Understanding the pin definitions is crucial for proper integration and operation of the DX-BT24-T module. The table below outlines each pin's number, name, and function.

Figure 4.1: Module Pin Definitions and Development Kit Demonstration. This image details the function of each pin on the BT24 module and provides an example wiring diagram for a development kit, including power and communication lines.

4.1. Pin Function Table

Note: For detailed information on specific pin functions and advanced usage, refer to the complete technical documentation.

5. Setup and Operation

5.1. Serial Communication

The DX-BT24-T module communicates via UART serial port. This allows for data exchange with microcontrollers, computers, or other Bluetooth-enabled devices.

1. Phone APP Communication: The module can communicate with a mobile phone using a dedicated APP (e.g., DX-SMART APP or a self-developed application). This enables control and monitoring of your device via Bluetooth.
2. Computer Software Communication: For communication with a computer, a master module or CP11 adapter is required to connect the DX-BT24-T to the computer's serial port software. Direct connection to a computer's built-in Bluetooth is not supported for BLE protocol.
3. Device-to-Device Communication: Two DX-BT24 modules can communicate with each other, typically with one configured as a master and the other as a slave.

The module supports multiple serial port baud rates: 2400, 9600, 19200, 38400, 57200, 115200. The serial port transmission speed can reach up to 10K Bytes/s.

5.2. AT Command Set

The DX-BT24-T module is configured using AT commands. These commands allow you to query and set various parameters of the module without needing to develop a Bluetooth program from scratch.

Figure 5.1: Application of Direct Serial Communication and AT Command Set. This image shows how the module communicates with phones, computers, and other devices, alongside a table listing common AT commands and their descriptions.

Common AT Commands:

• AT+VERSION: Query version number.
• AT+LADDR: Query MAC Address.
• AT+NAME: Query Bluetooth Name.
• AT+NAME<param>: Set Bluetooth Name.
• AT+NAMAC: Query Bluetooth Parameters.
• AT+NAMAC<param>: Set Bluetooth Parameters.
• AT+STOP: Query Serial Stop Bit.
• AT+STOP<param>: Set the Serial Stop Bit.
• AT+PARI: Query serial port parity bit.
• Other commands include setting baud rate, UUID, transmission power, broadcast time, command disconnection, and restart.

Important: For a complete list of AT commands and their detailed usage, please refer to the comprehensive technical documentation provided by the manufacturer.

6. APP Application Operation

The DX-BT24-T module supports communication with mobile applications for configuration and data transfer. The DX-SMART APP or other self-developed applications can be used.

Figure 6.1: DX-SMART APP Application Operation. This image displays various screens of the DX-SMART application, demonstrating its functionality for managing and communicating with the Bluetooth module, including setting parameters and transparent data transmission.

Note: The DX-BT24-T module uses the BLE protocol. It cannot be searched and connected directly through your phone's built-in Bluetooth settings. You must use a compatible application (e.g., DX-SMART APP or a custom-developed APP) to establish a connection. Similarly, direct connection via a computer's or notebook's built-in Bluetooth is not supported. For computer connectivity, a master module or CP11 adapter is required to use serial port software.

Android and iOS SDKs are available to support customization and development services for your own applications.

7. Specifications

8. Troubleshooting

• Module Not Discoverable by Phone/PC: Ensure you are using a compatible application (e.g., DX-SMART APP) for discovery and connection, as the module uses BLE protocol and cannot be directly paired via standard Bluetooth settings. For PC, a master module or CP11 adapter is required.
• Communication Issues:
  • Verify correct wiring of UART TX/RX, GND, and power pins.
  • Check that the baud rate settings on both the module (configured via AT commands) and the communicating device (e.g., microcontroller, serial terminal) match.
  • Ensure the power supply voltage is stable at 3.3V.
  • Confirm the communication distance is within the specified 45m range, especially in environments with obstacles.
• Module Not Responding to AT Commands:
  • Ensure the module is in the correct mode for AT command input (refer to technical documentation).
  • Verify the serial terminal settings (baud rate, data bits, parity, stop bits) match the module's configuration.
  • Check for proper command syntax, including carriage return/line feed requirements.
• Unexpected Power Consumption: Review the module's operating mode. Ensure it enters hibernation mode (2 µA) when intended, or low power working mode (19 µA) if active but not transmitting. Check for any continuous activity that might prevent low-power states.

9. Warranty and Support

PDDAXLQUE, as the manufacturer, provides comprehensive technical support for the DX-BT24-T module. We offer OEM and ODM services and are committed to assisting users with any issues.

• Technical Documentation: Access to technical documentation, AT command sets, module footprints, reference design schematics, and development/test tools is available.
• Development Kits: For initial verification and accelerated product development, purchasing a development kit is recommended.
• Contact Support: If you encounter any problems or require assistance, please contact us through the provided service support channels. Refer to the "User Guide → Product Information → Service Support" section for contact details.

The module has passed BQB, CE, FCC, IC, SRCC, and ROHS certifications, ensuring product safety and reliability.