BT85x - Bluetooth v4.2 USB HCI modules and adapter

Classic Bluetooth and Bluetooth Low Energy (BLE) USB HCI modules and adapter, supporting a host USB interface

Laird's BT85x series of USB HCI modules and Adapter utilise the Cypress CYW20704 A2 chipset to provide exceptionally low power consumption with outstanding range for OEMs needing both Classic Bluetooth and Bluetooth Low Energy support. The Bluetooth v4.2 core specification shortens development time and provides enhanced throughput, security and privacy.

The BT850 modules are ideal when designers need both performance and minimum size. For maximum flexibility in integration, they support a host USB interface, I2S and PCM audio interfaces, GPIO, and Cypress' GCI coexistence (2-Wire). The modules provide excellent RF performance and identical footprint options for integrated antenna or an external antenna via a trace pin.

These modules present a Bluetooth standard HCI interface with native support for Windows, Linux and Android Bluetooth software stacks for operating system backed devices. The BT851 Pluggable USB Adapter with inbuilt Bluetooth stack simply plugs into any Windows, Android or Linux device via external USB connection.

Additionally, Laird has partnered with Searan for support of their ultra small, flexible 'dotstack' platform for embedded Cortex M3 and M4 implementations.


  • Bluetooth v4.2 - Dual Mode - BR / EDR / LE - Classic Bluetooth and Bluetooth Low Energy (BLE)
  • Compact footprint - As small as 8.5x12.85 mm
  • Class 1 output - up to 8 dBm
  • USB v2.0 Host interface
  • GPIO, GCI, I2S and PCM
  • Industrial operating temperature: -30° to +85°C
  • Bluetooth SIG approved - Hardware Controller Subsystem
  • International regulatory approvals - FCC, IC, CE, RCM, & Japan approvals
  • Two form factors: BT850 Module or BT851 packaged USB Adapter. Embed or plug in, design your way.
  • Broad OS support - Windows, Linux, Android
  • Fully-Featured development kit - Low cost kit for prototyping/debugging/integration testing to speed development time

For sales and technical development support from our in-house engineering team, please contact the Alpha Micro team.

  • Antenna Options:
    • Internal Multilayer Ceramic (BT850-SA)
    • External SMT Pad (BT850-ST)
  • Bluetooth Version:
    • V4.2 Dual Mode
  • Chipset:
    • Cypress CYW20704 A2
  • Compliance:
    • FCC / IC / CE / RCM / Giteki
  • Data Rate:
    • Up to 3 Mbps (over the air)
  • Frequency:
    • 2.402 - 2.480 GHz
  • Input Power:
    • 3.0V - 3.6V (BT850-SA and BT850-ST)
    • 5V via USB port (BT851)
  • Logical Interfaces:
    • Full-speed USB 2.0
  • Max Transmit Power:
    • Class 1
    • +8 dBm from antenna
    • +8 dBm from trace pin
  • Operating Systems supported:
    • Windows, Linux and Android Bluetooth software stacks for operating system backed devices
  • Power Consumption (Tx):
    • < 55 mA
  • Range:
    • Circa 100 meters
  • Receive Sensitivity:
    • -94 dBm
  • Wi-Fi Coexistence:
    • 2-wire Cypress Global Coexistence Interface (GCI)
Part No. Description Pack Size
BT850-SA Bluetooth v4.2 Dual Mode USB HCI module - integrated antenna Cut tape
BT850-SA-T/R Bluetooth v4.2 Dual Mode USB HCI module - integrated antenna Reel of 2500 modules
BT850-ST Bluetooth v4.2 Dual Mode USB HCI module - external antenna via trace pin Cut tape
BT850-ST-T/R Bluetooth v4.2 Dual Mode USB HCI module - external antenna via trace pin Reel of 2500 modules
BT851 Bluetooth v4.2 Dual Mode USB dongle Each
Support Tools
DVK-BT850-SA Development kit for BT850-SA module Each
DVK-BT850-ST Development kit for BT850-ST module Each

Laird's BT850 development kit (DVK-BT850-Sx) provides a platform for rapid prototyping of BT850-Sx series modules. The development board provides simple, easy-to-use access to the various hardware interfaces and configuration options for the module. The DVK is the perfect platform to provide for early development testing of the BT850-Sx series features and functionality, prior to designing the module onto a host PCB.

DVK-BT850-SAEach DVK-BT850-Sx includes:

Development motherboard The motherboard has the BT850-Sx module already soldered onto it and all available hardware interfaces are exposed.
USB cable - USB A type male to Micro-USB type The USB cable can be used to power, control, and configure the BT850-Sx.
Stand-off Screw nuts x 4 pcs; Stand-off x 4 pcs
Insert card Provides links to additional information including BT850-Sx datasheet, utilities, schematics, and application notes.
External antenna

Only supplied with DVK-BT850-ST.

Antenna supplied is Laird part # 0600-00040.

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Last updated: 21 May 2018