1. Introduction
The Feasycom FSC-BT1114QI is a state-of-the-art Bluetooth module powered by the Qualcomm QCC3086 chipset, supporting both Classic Bluetooth and the latest LE Audio standard. This module is designed for seamless integration into various wireless connectivity products, offering advanced audio capabilities including multi-stream Auracast broadcast audio and a wide range of audio codecs.
Equipped with Feasycom's powerful and user-friendly firmware, the FSC-BT1114QI simplifies Bluetooth functionality access through simple ASCII commands via a serial interface, effectively acting as a Bluetooth modem. This makes it an ideal solution for developers aiming to incorporate robust Bluetooth wireless technology into their designs.
2. Features
- Chipset: Qualcomm QCC3086 Bluetooth® v5.4 wireless MCU with integrated 240 MHz Qualcomm® audio DSP.
- Bluetooth LE Audio:
- LE Isochronous Channel (CIS/BIS/ISOAL)
- LC3 codec, multi-stream, Auracast broadcast audio
- Bluetooth Classic Audio:
- Bluetooth Synchronous Connection-Oriented Channel (SCO: HFP)
- Bluetooth Asynchronous Connection-Less Channel (ACL: A2DP)
- Advanced audio algorithms: Qualcomm® aptX™, aptX HD, aptX Adaptive, and aptX-LossLess Audio
- RF Specification:
- Bluetooth v5.4 dual mode transceiver
- Supports both Bluetooth® Classic Audio and LE Audio
- Classic Bluetooth audio receive to LE audio transmit
- Bluetooth BR/EDR/BLE profiles: SPP, ATT, GATT, etc.
- Class 1 Bluetooth power level supported
- PCB antenna
- General:
- 12mm × 17mm stamp 45-pin package
- On-board antenna, with support for external Feasycom or other antennas
- High-performance 24-bit stereo audio interface
- Digital and analog microphone interfaces
- Flexible LED controller and LED pins with PWM support
- Serial interfaces: UART, Bit Serializer (I²C/SPI), USB 2.0
- 1 x unidirectional 24‑bit inter-integrated circuit sound (I²S) interface
- Sony/Philips digital interface (SPDIF): Two instances configurable as inputs
- Quad analog inputs configurable as single-ended line inputs or, unbalanced or balanced analog microphone inputs
- Support for OTA (Over-The-Air) firmware upgrade
- Support for in-depth Customization
- Works with FeasyLEA LE audio app
3. Specifications
3.1. General Specifications
| Category | Feature | Value |
|---|---|---|
| Chip | QCC3086 | |
| Bluetooth Version | V5.4 | |
| Frequency Band | 2402MHz~2480MHz | |
| Transmit Power | +10 dBm | |
| Receiver | -93dBm | |
| Interfaces | UART/I2S/USB | |
| Audio CODEC | LE Audio, aptX, aptX-HD, aptX Adaptive, aptX-LossLess and SBC audio codecs | |
| Profiles (BR/EDR) | A2DP/AVRCP/HFP/HSP/HOGP/PBAP/SPP | |
| Profiles (BLE) | GATT Client & Peripheral | |
| FW upgrade | Via UART (TBD), USB (TBD), OTA, SPI | |
| Supply Voltage | 3.0V~4.6V | |
| Dimensions (mm) | 12mm × 17 mm × 2.2mm | |
| Operating Temperature | -40°C ~+85°C | |
| Storage Temperature | -40°C ~+85°C | |
| Wireless function | Yes | |
| High-concerned chemical | None | |
| Item Type | Bluetooth LE Audio Module | |
| Origin | Mainland China |
3.2. Electrical Characteristics
3.2.1. Absolute Maximum Ratings
Stressing the device beyond these ratings may cause instantaneous and permanent damage. Device performance is not guaranteed beyond the Recommended Operating Conditions. Prolonged exposure beyond the Recommended Operating Conditions may permanently affect device reliability and/or performance.
| Parameter | Pin | Min | Max | Unit |
|---|---|---|---|---|
| Storage Temperature | - | -40 | 85 | °C |
| Supply voltage VCHG | VBUS | -0.4 | 6 | V |
| Battery | VDD | -0.4 | 4.8 | V |
| VDD_IO | VDD_IO | -0.4 | 3.8 | V |
| 1.8 V | MIC_LN/LINEIN_1_N, MIC_LP/LINEIN_1_P, MIC_RN/LINEIN_2_N, MIC_RP/LINEIN_2_P | -0.4 | 2.1 | V |
| Digital I/O | PIO, RESET | -0.3 | 3.6 | V |
| Digital I/O | VDD_IO | -0.3 | 3.6 | V |
| Digital I/O | AIO/LED[1:0] (Disabled / Digital Input / Open Drain Output Modes) | 0 | 4.8 | V |
| Digital I/O | AIO/LED[1:0] (AIO Mode) | 0 | 1.95 | V |
| All ground / VSS pads | -0.4 | 0.4 | V | |
| DC Voltage | BT_RF | 0 | 0.4 | V |
| Radio Receive | BT_RF | -0.4 | 0.4 | V |
| Radio Transmit (3:1 VSWR) | BT_RF | -1.6 | 1.6 | V |
3.2.2. Recommended Operating Conditions
| Parameter | Pin | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Operating temperature range | - | -40 | 25 | 85 | °C |
| Charger operating temperature range | - | -10 | 25 | 85 | °C |
| Supply voltage 5 V (USB VBUS) | VBUS | 4.75 | 5.00 | 5.5 | V |
| Battery | VDD | 3.0/2.8(b) | 3.7 | 4.6 | V |
3.2.3. Digital Terminals
| Digital terminals | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VDD_IO supply | 1.7 | 3.6 | V | |
| VIL input logic level low | 0.25 x VDD_IO | V | ||
| VIH input logic level high | 0.625 x VDD_IO | V | ||
| Drive current (configurable) | 2,4,8,12 | 4 | mA | |
| VOL output logic level low, at configured drive current | 0.22 x VDD_IO | V | ||
| VOH output logic level high, at configured drive current | 0.75 x VDD_IO | V | ||
| Strong pull (up and down) | 50 | 70 | 125 | kΩ |
| Weak pull (up and down) | 729 | 1050 | 1350 | kΩ |
3.2.4. LED Driver Pads
| Digital terminals | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Open drain current | 5 | μA | ||
| LED pad resistance | 50 | mA | ||
| VIL input logic level low | 12 | Ω | ||
| VIH input logic level high | 0.8 | V |
3.3. MSL & ESD Ratings
| Parameter | Value |
|---|---|
| MSL grade | MSL 3 |
| ESD - Human-body model (HBM) rating | Pass ±2000 V, all pins |
| ESD - Charge-device model (CDM) rating | Pass ±400 V, all pins |
4. Setup and Hardware Integration
4.1. Block Diagram
The following diagram illustrates the internal block structure of the FSC-BT1114QI module, showing its main components and interfaces.
4.2. Pin Diagram and Definitions
The FSC-BT1114QI module features 45 pins. For a detailed visual representation of the pin layout, please refer to Figure 3-2 in the official datasheet (Page 5 of 19). The pin definitions are crucial for proper hardware integration:
| Pin | Pin Name | Type | Pin Descriptions |
|---|---|---|---|
| 1 | GND | Vss | Power Ground |
| 2 | SYS_CTRL | I | System Control (ON/OFF, boot) |
| 3 | MIC_LP | I/O | Microphone differential 1 input, positive / Differential audio line input 1, positive |
| 4 | MIC_LN | I/O | Microphone differential 1 input, negative / Differential audio line input 1, negative |
| 5 | MIC_RN | I/O | Microphone differential 2 input, negative / Differential audio line input 2, negative |
| 6 | MIC_RP | I/O | Microphone differential 2 input, positive / Differential audio line input 2, positive |
| 7 | MIC_BIAS | Mic bias output | |
| 8, 9 | NC | No Connect | |
| 10 | VDD_IO | Supply | 1.8V/3.3V I/O supply |
| 11 | PIO34 | I/O | Programmable I/O, Alternative function: I2C_SDA |
| 12 | PIO35 | I/O | Programmable I/O, Alternative function: I2C_SCL |
| 13, 14 | NC | No Connect | |
| 15 | PIO18 | I/O | Programmable I/O |
| 16 | PIO16/I2S_BCLK | I/O | Programmable I/O, Alternative function: I2S_BCLK |
| 17 | PIO19/I2S_DIN | I/O | Programmable I/O, Alternative function: I2S_DIN |
| 18 | PIO17/I2S_WS | I/O | Programmable I/O, Alternative function: I2S_WS |
| 19 | PIO15/I2S_MCLK | I/O | Programmable I/O, Alternative function: I2S_MCLK |
| 20 | VDD | VDD | 3V3 Supply |
| 21 | GND | Vss | Power Ground |
| 22 | AIO0/LED0 | I/O | General-purpose analog/digital input or open drain LED output |
| 23 | AIO1/LED1 | I/O | General-purpose analog/digital input or open drain LED output |
| 24 | RESET | I | Reset input |
| 25 | VBUS | I | USB Power (4.75~5.25V) |
| 26 | GND | Vss | Power Ground |
| 27 | USB_DP | USB Full Speed device D+ | |
| 28 | USB_DN | USB Full Speed device D- | |
| 29 | PIO38 | I/O | Programmable I/O |
| 30 | PIO39 | I/O | Programmable I/O |
| 31 | PIO37 | I/O | Programmable I/O |
| 32 | UART_TXD | I/O | Alternative function: UART_TXD |
| 33 | UART_RXD | I/O | Alternative function: UART_RXD |
| 34 | UART_CTS | I/O | Alternative function: UART_CTS |
| 35 | GND | Vss | Power Ground |
| 36 | RF | Bluetooth transmit/receive | |
| 37 | GND | Vss | Power Ground |
| 38 | PIO36 | I/O | Programmable I/O |
| 39 | PIO8 | I/O | Programmable I/O line/TBR_CLK |
| 40 | AIO2/LED2 | I/O | General-purpose analog/digital input or open drain LED output |
| 41 | AIO3/LED3 | I/O | General-purpose analog/digital input or open drain LED output |
| 42 | 3V3_OUT | O | 3.3V/2.9V OUT |
| 43 | PIO7 | I/O | Programmable I/O line/TBR_MISO[0] |
| 44 | 1V8_SMPS | O | 1.8V OUT |
| 45 | PIO6 | I/O | Programmable I/O line/TBR_MOSI[0] |
4.3. UART Interface Settings
The FSC-BT1114QI UART interface is a standard 4-wire interface (RX, TX, CTS, RTS) supporting both H4 HCI and raw UART for application use. The default baud rate is 115.2 k baud. The UART signal level ranges from 1.8 V to 3.3 V.
| Parameter | Possible Values |
|---|---|
| Baud rate | Minimum 9600 baud (≤0%Error), Standard 115200bps(≤0.08%Error), Maximum 2Mbps(≤0%Error) |
| Flow control | Supports Automatic Flow Control (CTS and RTS lines) |
| Parity | None, Odd or Even |
| Number of stop bits | 1 |
| Bits per channel | 8 |
4.4. Layout Recommendations
Proper PCB layout is critical for optimal performance, especially concerning the onboard antenna and RF characteristics. Adherence to these guidelines is essential for achieving the best RF performance and reliable operation.
- Module Placement: For optimal performance, place the module in the middle of the main board. The customer's baseboard beneath the module should be hollowed out.
- Clearance Area: Ensure a clearance area on L2/L3/Ln.../Bottom layers measuring 21.3mm x 2.0mm. No copper pour or traces are allowed on any layers beneath the IPEX connector.
- Antenna Connection and Grounding Plane:
- The trace from the module's antenna port to an external antenna should be 50Ω and as short as possible.
- Keep the external antenna and RF-IN port away from noise sources and digital traces.
- A matching network might be needed between the external antenna and RF-IN port.
- RF critical circuits should be clearly separated from digital circuits on the system board.
- The length of the trace or connection line should be kept as short as possible.
- Distance between connection and ground area on the top layer should be at least as large as the dielectric thickness.
- Routing the RF close to digital sections of the system board should be avoided.
- To reduce signal reflections, avoid sharp angles in microstrip line routing. Chamfers or fillets are preferred for rectangular routing; 45-degree routing is preferred over 90-degree routing.
- Avoid routing RF connections underneath the module.
- Use as many vias as possible to connect the ground planes.
For detailed diagrams and specific measurements regarding module layout, clearance areas, and antenna trace schematics, please consult Section 9 of the official datasheet.
4.5. Application Schematic
For a comprehensive visual guide on how to integrate the FSC-BT1114QI module into a typical application circuit, including power supply, UART connections, audio interfaces, and optional external antenna setup, please refer to the Application Schematic in Section 11 of the official datasheet (Page 20 of 19).
5. Operating
The FSC-BT1114QI module is designed to be controlled via simple ASCII commands sent over a serial interface (UART). This allows developers to implement Bluetooth functionality within their host system. The module functions similarly to a Bluetooth modem, abstracting complex Bluetooth protocol stack details.
For detailed information on the command set and communication protocols, refer to the programming guide or API documentation provided by Feasycom, which is typically included with the full development kit or available on their support portal.
6. Maintenance and Handling
6.1. Storage and Handling
- Store the module within the specified storage temperature range of -40°C to +85°C.
- Maintain humidity between 10% and 90% non-condensing.
- The module is rated MSL 3 (Moisture Sensitivity Level 3). Ensure proper handling to prevent moisture absorption. If baking is required for higher temperatures, modules must be removed from the shipping tray.
- Always handle the module in an ESD-safe environment to prevent damage from electrostatic discharge.
6.2. Soldering Recommendations (Reflow Profile)
The FSC-BT1114QI is compatible with industrial standard reflow profiles for Pb-free solders. The optimal reflow profile depends on the PCB's thermal mass, oven efficiency, and solder paste type. The following is a general guideline:
- Pre-heat Zone (A): Raise temperature at 0.5 – 2 °C/s to 120 ~ 150 °C to preheat the PCB and components uniformly and remove solvent.
- Equilibrium Zone 1 (B): Maintain temperature between 150°C and 210°C for 60 to 120 seconds. This stage allows flux to soften, encapsulate solder particles, and eliminate oxide film.
- Equilibrium Zone 2 (C) (Optional): For upright component issues, keep temperature between 210-217°C for 20 to 30 seconds.
- Reflow Zone (D): The peak temperature should be between 230 ~ 250 °C. Soldering time above 217 °C should be 30 to 90 seconds.
- Cooling Zone (E): A fast cooling rate (typically 4 °C) is recommended to ensure small solder grains for a longer-lasting joint.
Feasycom recommends using a Step-Stencil with a thickness of 0.16-0.2mm, which can be modified based on the product. For detailed reflow profile graphs and specific parameters, refer to Section 7 of the official datasheet.
6.3. Packaging Information
The FSC-BT1114QI modules are typically supplied in tray vacuum packaging. The tray dimensions are approximately 230mm * 180mm * 8mm. For bulk orders, optional packing boxes are available. The minimum packing quantity is 1000pcs per carton. For specific packing requirements, please confirm with Feasycom.
7. Troubleshooting
This section provides general troubleshooting advice for common issues that may arise during the integration and operation of the FSC-BT1114QI module. For specific technical issues, refer to the detailed datasheet or contact Feasycom support.
- No Power/Module Not Responding:
- Verify that the supply voltage (VDD) is within the recommended range (3.0V~4.6V).
- Check all power and ground connections for proper soldering and continuity.
- Ensure the SYS_CTRL pin is correctly handled to boot the device.
- UART Communication Issues:
- Confirm UART baud rate, parity, stop bits, and bits per channel settings match between the module and the host.
- Check RX/TX connections for correct wiring (TX of host to RX of module, RX of host to TX of module).
- Verify UART signal levels are compatible (1.8V to 3.3V).
- If flow control (CTS/RTS) is enabled, ensure these lines are correctly connected and functioning.
- Poor RF Performance/Connectivity:
- Review the PCB layout against the recommendations in Section 4.4, especially regarding antenna placement and clearance areas.
- Ensure no copper pour or traces are present beneath the antenna or IPEX connector area.
- Check for any nearby noise sources or digital traces that might interfere with RF signals.
- If using an external antenna, verify the 50Ω impedance matching and shortest possible trace length.
- Audio Issues:
- Verify connections to I2S, SPDIF, or analog audio interfaces.
- Ensure correct audio codec settings are applied.
- Check microphone bias and input connections if using analog microphones.
8. User Tips
No specific user tips are available from reviews or Q&A at this time. However, based on the module's design and features, consider the following general tips for optimal use:
- Development Kit: For initial development and prototyping, utilizing a Feasycom development kit for the FSC-BT1114QI can significantly accelerate the integration process by providing a ready-to-use platform and debugging tools.
- Firmware Customization: Leverage the module's support for in-depth customization and OTA upgrades to tailor its functionality to your specific application needs and ensure future compatibility.
- LE Audio Exploration: Experiment with the FeasyLEA LE audio app to explore the full capabilities of LE Audio, multi-stream, and Auracast features, especially for innovative audio broadcasting applications.
- Documentation Review: Always refer to the latest version of the official datasheet and any available application notes from Feasycom for the most accurate and up-to-date technical information and integration guidelines.
9. Certifications
The Feasycom FSC-BT1114QI module is designed and manufactured to meet various international standards and certifications, ensuring compliance and reliability for global markets.
10. Warranty and Support
Feasycom provides comprehensive support for its products. For any technical inquiries, troubleshooting assistance, or warranty claims, please contact Feasycom directly through their official channels.
- Email: sales01@feasycom.com
- Address: Rm 508, Building A, Fenghuang Zhigu, No.50, Tiezai Road, Xixiang, Baoan District, Shenzhen, 518102, China
- Telephone: 86-755-27924639, 86-755-23062695
- Official Website: www.feasycom.com
For the most detailed technical information, including complete pin definitions, electrical characteristics, and application schematics, please refer to the official FSC-BT1114QI Datasheet (PDF) available at https://manuals.plus/m/864032e2621df93b751cee4b521821e37e85cbf7ec932a1a170fe43d7a9589c4.
