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In the era of the Internet of Things (IoT), Bluetooth Low Energy (BLE) has become the technology of choice for billions of connected devices, thanks to its ultra-low power consumption, robust connectivity, and mature ecosystem. Shenzhen Feasycom introduces the FSC-BT691, a single-mode Bluetooth 5.1 Low Energy module based on the Renesas DA14531 chipset. It integrates a high-performance 2.4 GHz transceiver with an ARM® Cortex®-M0+ microcontroller in a compact form factor. Designed for battery-powered and energy-harvesting applications, the FSC-BT691 delivers reliable wireless communication without compromising on power efficiency.

 

  1. Key Features & Benefits

1.1 Low Power Consumption

  • Sleep current as low as 1.6 μA.
  • Active RX current: 2.2 mA; TX current: 3.5 mA (at 0 dBm output with DC-DC converter).
  • Ideal for wearables, medical disposables, and wireless sensor nodes.

1.2 Robust RF Performance

  • Compliant with Bluetooth 5.1 (LE only).
  • Programmable output power: -19.5 dBm to +2.5 dBm.
  • Excellent receiver sensitivity: -94 dBm (typical).
  • Supports up to three simultaneous BLE connections.

1.3 Powerful Processing Core

  • 32-bit ARM Cortex-M0+ running at up to 16 MHz.
  • 48 KB retainable system RAM + 32 KB One-Time-Programmable (OTP) memory.
  • Can operate as a standalone application processor, eliminating the need for an external MCU.

1.4 Rich Peripheral Interfaces

  • UART, I2C, SPI, PWM, and 10-bit ADC (3 channels).
  • Up to 6 programmable GPIOs with configurable pull-up resistors.
  • Easy integration with sensors, buttons, LEDs, and other peripherals.

1.5 Wide Operating Range & Industrial Grade

  • Supply voltage: 1.65 V to 3.6 V.
  • Operating temperature: -40°C to +85°C.
  • Suitable for harsh industrial environments and outdoor deployments.

1.6 Global Certifications

  • FCC, TELEC, KC, IC, CE, SRRC certified.
  • RoHS compliant, lead-free.
  • Streamlines product certification and accelerates time-to-market.

 

  1. Typical Applications

 

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The FSC-BT691‘s versatility and low power make it an excellent choice for a wide range of IoT products:

Application Area Example Products
Medical & Healthcare Disposable temperature patches, glucose meters, pulse oximeters, smart pill bottles
Wearables Smart bands, smartwatches, activity trackers
Human Interface Devices Bluetooth stylus, keyboards, mice, touchpads
Industrial IoT Wireless sensor nodes, data loggers, industrial controllers
Consumer Electronics Smart toys, remote controls, home automation sensors
  1. Easy Development & Integration
  • AT command set and comprehensive SDK for rapid development.
  • Supports all standard GATT profiles and custom services.
  • Over-the-Air (OTA) firmware upgrade capability for post-deployment updates.
  • Detailed hardware integration guidelines (PCB layout, antenna design, soldering profile) and application schematics provided.
  • Reference designs and technical support from Feasycom’s engineering team.