RF-star RF-BM-2642B1

RF-BM-2642B1 is a Bluetooth 5.0 module. In addition to integrating a high-performance ARM Cortex-M4F processor for application logic and a dedicated ARM Cortex-M0 processor for the RF core, the module also features a 16-bit low-power sensor processing core. It includes 352 KB of programmable flash memory and 80 KB ultra-low leakage RAM (SRAM). Supports Bluetooth Low Energy 5.0 with backward compatibility to Bluetooth Low Energy 4.2 and earlier versions.

The module exposes all I/O pins and complies with FCC, CE, and RoHS regulations for RF and EMC, meeting export requirements. The module integrates an industrial-grade 48 MHz crystal oscillator and a 32.768 kHz low-power clock crystal oscillator. It includes multiple peripherals such as I2C, I2S, UART, SPI, ADC, and GPIO.

The module can operate in bridge mode (transparent transmission mode). In bridge mode, the host MCU can communicate bidirectionally with mobile devices via the module's general-purpose serial port. Users can also manage and control certain communication parameters through specific serial AT commands. The specific meaning of user data is defined by the upper-layer application. Mobile devices can perform write operations to the module via an APP, and the written data will be sent to the host MCU through the module's serial port. Upon receiving data packets from the host MCU's serial port, the module will automatically forward them to the mobile device. For development in this mode, users are responsible for both the host MCU firmware design and the mobile device APP code design.

To ensure program stability, the module begins normal operation 600 ms after power-on. For large-volume transparent data transmission, it is recommended to start 6 seconds after the module establishes a connection, as the connection setup requires time to negotiate MTU, connection interval, and other parameters. Initiating high-speed transparent transmission during this period can easily cause packet loss or device freeze.

• Easy to use, no Bluetooth protocol stack experience required
• Supports all Bluetooth 5.0 features: 2M PHY, Long Range advertising, extended advertising
• Supports BLE single master mode, single slave mode, master-slave mode, and Beacon mode
• Module can simultaneously act as master and slave roles, connecting to slave devices while being connected by other master devices (master-slave mode)
• Master role supports multi-connection: up to 7 slave devices simultaneously, and in master-slave mode can be connected by another master device as a slave
• Default 20 ms connection interval for fast connection with good Android and iOS compatibility
• User interface uses universal UART design, full-duplex bidirectional communication, minimum baud rate 1200 bps, maximum 921600 bps
• Supports AT command software reset
• MAC address readout, supports AT command MAC address modification (takes effect after reset)
• Supports AT command adjustment of BLE connection interval to control different forwarding rates (dynamic power adjustment)
• Supports AT commands for TX power adjustment, advertising interval modification, UART baud rate modification, module name modification, etc.
• Supports AT command modification of slave role Service UUID
• In master or master-slave mode, supports custom selection of UUID channels for receiving and transmitting
• AT commands can be sent via APP or UART
• High-speed transparent transmission, stable throughput at 43.5 KB/s (512000 bps)
• Supports PHY communication rate modification: 1M, 2M, and LE_CODED (125K & 500K)
• Supports custom advertising data, maximum custom length 31 bytes
• Supports extended advertising packets, maximum customizable extended advertising of 251 bytes
• Supports Long Range advertising packet configuration (Long Range/LE_CODED)
• Supports Bluetooth pairing and bonding
• Ultra-low operating power consumption; measured module power consumption as follows (overall power consumption reduced by approximately 1 μA after disabling watchdog)

• 2400 MHz to 2480 MHz ISM and SRD systems - Receive bandwidth down to 4 kHz
• Residential and building automation - Building security systems: motion detectors, electronic door locks, door/window sensors, gateways - HVAC: thermostats, wireless ambient sensors, HVAC system controllers - Fire safety systems: smoke detectors, fire alarm control panels - Video surveillance: IP cameras - Garage door openers - Elevator and escalator controllers
• Smart grid and automatic meter reading - Water, gas, and electricity meters - Heat allocation meters - Gateways
• Wireless sensor networks - Long-range sensor applications
• Asset tracking and management
• Factory automation
• Wireless healthcare applications
• Energy harvesting applications
• Electronic shelf labels (ESL)