BT840

BT840 is not a single standard; the name is used by several vendors for different Bluetooth modules/SoCs.
A typical BT840 module provides:
- A Bluetooth radio (Classic and/or BLE)
- A host interface (usually UART; some variants offer SPI/I2C)
- Onboard MCU/firmware for basic processing
It’s used to connect microcontrollers to other Bluetooth devices for data, sensors, audio, HID, etc., and usually supports pairing, security features, and common profiles (e.g., SPP, GATT).
Power: designed for low-voltage operation with sleep/low-power modes for battery apps.
Configuration: often via AT commands or an SDK; firmware updates are usually possible over UART or a dedicated DFU mechanism.
For a precise introduction, please specify the exact BT840 model and vendor (or share a datasheet/link).

BT840 features vary by vendor/model. Please share the exact module or a link for precise specs. Common features across BT840 variants include:
- Bluetooth type: Classic, BLE, or both; supported profiles vary (e.g., SPP, HID, A2DP, AVRCP, HFP for Classic; BLE GATT for BLE)
- Version: depends on variant (e.g., BT 2.x/4.x/5.x)
- Interfaces: UART (AT commands), plus SPI or I2C; GPIOs; PWM
- Power: typical 3.3V supply (some variants support 1.8–3.6V); sleep/low-power modes; current consumption varies
- Range: Class 2 (~10 m) or Class 1 (~100 m), depending on module
- Development: AT command set or SDK/API; firmware updates available on many models
- Memory: on-board flash/RAM (size varies by variant)
- Security: pairing/bonding, encryption options
- Certifications: CE/FCC/IC (and RoHS) depending on variant
- Optional: audio features (A2DP/AVRCP, mic/line-in) and MCU GPIO expansion on some versions
Share vendor for exact specs.

BT840 is a Bluetooth module (BLE) for low‑power wireless communication. Typical application areas include:
- Wearables and personal devices
- Health/medical sensors
- Smart home and IoT devices (sensors, actuators, hubs)
- Wireless sensors and industrial automation
- Asset tracking and logistics
- Automotive, telematics, and in-car peripherals
- Beacons, proximity services, and peripherals (headsets, keyboards, mice)

BT840’s package type isn’t fixed; it varies by manufacturer. Please specify the maker or share the datasheet. In general, check the Package/Mechanical or Outline drawing in the datasheet for the exact package (e.g., QFN/DFN, SOIC, etc.).