BT111-A-HCI

BT111-A-HCI is a Bluetooth module that implements the radio, baseband, and Bluetooth stack and exposes a Host Controller Interface (HCI) to a host MCU. The host (MCU or processor) talks to the module using HCI over UART or USB; the module handles all LMP/Link Management and data transfer (ACL/SCO) while the host runs application logic.
Key points:
- Architecture: module is the controller; host is the controller’s host; HCI commands/events and data are exchanged.
- Variants: supports Bluetooth Classic, BLE, or both depending on the version; profiles like SPP, HID, or GATT.
- Interfaces and power: typically 3.3V logic; small footprint; vendor firmware; may require vendor-supplied host drivers or sample code.
- Use: quick Bluetooth integration in embedded devices; ideal when you want minimal host-side stack.
Note: details vary by vendor; share a datasheet for precise specs. If you have a specific vendor or datasheet, I can tailor the overview.

BT111-A-HCI features (typical; verify with exact datasheet):
- HCI-based Bluetooth module with UART as primary interface; USB optional
- Bluetooth BR/EDR and BLE variants (model/version dependent)
- 2.4 GHz ISM band with adaptive frequency hopping
- On-board ROM/flash with vendor firmware; host can upgrade via UART/USB
- HCI command interface exposed to host; support for common profiles via SDK (SPP, HID, A2DP/AVRCP, HFP as applicable)
- GPIOs, ADC inputs, PWM outputs; supports 3.0–3.6 V supply; low-power sleep modes
- Antenna: internal or external; requires proper matching/network layout
- UART speeds up to high baud rates; supports flow control
- Power management: sleep/standby with wake-on-interrupt
- Security: pairing, bonding, encryption; optional secure boot
- Certifications: region-specific (FCC/CE/KC/RC, etc.)
- Documentation and tools: datasheet, development guide, sample code
Note: exact feature set varies by revision/vendor; consult the specific datasheet for BT111-A-HCI.

- Pin count: 28 pins (QFN28/LQFP28 variants common for BT111-A-HCI).
- Function: Bluetooth host controller with HCI interface. Provides the radio/baseband and HCI transport to the host MCU (typically via UART for HCI-UART). Includes power, ground, IRQ, RESET/EN, flow-control lines (CTS/RTS), and several GPIOs for status and control.

Manufacturer: BeTop Technology Co., Ltd. (BeTop).
What kind of company: A Chinese company that designs and manufactures Bluetooth/wireless audio modules and other embedded hardware (ODM/OEM supplier of Bluetooth HCI modules for consumer electronics).

BT111-A-HCI is a Bluetooth HCI module (radio + controller) that interfaces with a host MCU/SoC via HCI (UART/USB). Typical application areas:
- Wireless audio and hands-free devices (headsets, speakerphones)
- Peripherals (keyboard, mouse, gamepad)
- IoT and sensors (telemetry, asset tracking, environmental sensing)
- Wearables and medical/fitness devices
- Automotive (hands-free, diagnostics, car kits)
- Industrial automation and remote monitoring
- Smart home devices and beacons
- USB/PC and mobile dongles bridging Bluetooth to hosts

BT111-A-HCI's packaging is vendor-specific. Please provide the supplier or datasheet. Generally, BT111 variants use a QFN-style package (around 6×6 mm), but confirm the exact pin count and package from the official mechanical drawing.