FSC-BT691 DA14531 Ultra-Low-Power BLE 5.1 Mini Beacon Module
FSC-BT691 is a Bluetooth Low Energy (BLE) 5.1 Module featuring a 2.4 GHz transceiver and an ARM Cortex-M0+ microcontroller with 48 kB of RAM and 32 kB of One-Time Programmable (OTP) memory. It serves both as a standalone application processor and a data pump in hosted systems. Its low active RF and MCU current consumption, along with low-power mode operation, ensure extended battery life suitable for small coin cell and energy-harvesting applications. The module supports comprehensive BLE firmware including L2CAP, Security Manager (SM), Attribute Protocol (ATT), Generic Attribute Profile (GATT), and Generic Access Profile (GAP), accommodating all Bluetooth SIG profiles and custom profiles. It is designed for a wide range of applications including disposables, wireless sensor nodes, beacons, proximity tags, trackers, smart HID devices like styluses, keyboards, mice, and trackpads, as well as toys, and medical and industrial applications.
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- 2.4-GHz RF Transceiver Compatible With Bluetooth Low Energy (BLE) 5.1
- Supports up to three BLE connections
- Typical cold boot to radio active 35 ms
- 16MHz 32-bit ARM® Cortex-M0+ with SWD interface
- Dedicated Link Layer Processor
- AES-128 Encryption Processor
- 32kB One-Time-Programmable (OTP)
- 48kB Retainable System RAM
- 144kB ROM
- Clock-less hibernation mode: 270 nA
- 10-bit ADC for battery voltage monitoring
- Built-in temperature sensor for die temperature monitoring
- TX: 3.5 mA, RX: 2.2 mA (system currents with DC-DC, VBAT_HIGH = 3V and 0 dBm)
- Programmable transmit output power from -19.5 dBm to +2.5 dBm
- -94 dBm receiver sensitivity
- Support SPI, UART, I²C interface
- Support the OTA upgrade
- Wide Operating Voltage Range: 1.65V ~ 3.6V
- Operating Temperature: -40°C ~ +85°C
| Categories | Features | Implementation |
|---|---|---|
| Wireless Specification | Bluetooth Version | BLE 5.1 |
| Frequency | 2.400 ~ 2.4835 GHz | |
| Transmit Power | -19.5 ~ +2.5 dBm | |
| Receive Sensitivity | -94 dBm (Typ.) | |
| Modulation | GFSK | |
| Host Interface and Peripherals | UART | TX, RX, CTS, RTS |
| General Purpose I/O | ||
| Default 115200, N, 8, 1 | ||
| Baudrate support from 1200 to 921600 | ||
| 5, 6, 7, 8 data bit character | ||
| GPIO | 7 (maximum, configurable) lines | |
| Pull-up resistor (25 KΩ) control | ||
| Read pin-level | ||
| I²C | 2 (configurable from GPIO total), up to 400 Kbps | |
| ADC | Analog input voltage range: 0.4V ~ 1.4V (or 2.4V) based on configure | |
| Supports single 10-bit SAR ADC conversion | ||
| 3 channels (configured from GPIO total) | ||
| Up to 200Ms/s conversion | ||
| PWM | 2 PWM outputs | |
| Supports pulse alignment or center-alignment Supports fault detection |
||
| Profiles | Class Bluetooth | No Support |
| Bluetooth Low Energy | GATT Client & Peripheral - Any Custom Services | |
| FW upgrade | J-Link | |
| Wide Supply Voltage | Supply | 1.65V ~ 3.6V |
| Power Consumption | 1.6uA (Sleep) | |
| Physical | Dimensions (mm) | 10 × 11.9 × 2.2; Pad Pitch 0.8 |
| Environmental | Operating Temperature | -40°C ~ +85°C |
| Storage Temperature | -40°C ~ +85°C | |
| Miscellaneous | Lead Free | Lead-free and RoHS compliant |
| Warranty | One Year | |
| Humidity | 10% ~ 90% non-condensing | |
| MSL Grade | MSL 3 | |
| ESD Grade | Human Body Model | ±2000V |
| Charged Device Model | ±2500V |
Firmware
| Firmware No. | Application | Profiles |
|---|---|---|
| FSC-BT691 | Data | GATT Server |
| FSC-BT691 | Data | GATT Client |
| FSC-BT691 | Other | Customization |
