BT740 Series Bluetooth Module

Not Recommended for New Design (NRND)

Overview

Every BT740 series Bluetooth module from Laird Connectivity is designed to add robust, long-range Bluetooth data connectivity to any device. Based on the market-leading Cambridge Silicon Radio (CSR) BC04 chipset, BT740 modules provide exceptionally low power consumption with outstanding Class 1 range via 18 dBm of transmit power. The modules support Bluetooth Version 2.1 specification, including Secure Simple Pairing (SSP), which improves security and enhances the ease of use for end customers. A broad range of Bluetooth profiles such as Serial Port Profile (SPP) and other vital features make BT740 modules superior to other Class 1 Bluetooth modules. Available in BT740-SA and BT740-SC variants.

Product Type Technology OS/Software System Architecture Chipset (Wireless) Antenna Type Logical Interfaces Frequency Range (Min) Frequency Range (Max) Bluetooth Version Compliance Connector Data Rate Max Transmit Power Protocols Range Receive Sensitivity Wireless Specification
BT740-SA Embedded Module Bluetooth Classic, Bluetooth 2.1 AT Commands, Embedded Stack Hosted QCA (CSR) BC04 Internal Serial, GPIO, ADC 2402 MHz 2480 MHz v2.1 FCC / IC / CE SMT Up to 2.1 Mbps +18 dBm AT Command Set Up to 1 km Better than -87 dBm Bluetooth v2.1 Enhanced Class 1
Product Type Technology OS/Software System Architecture Chipset (Wireless) Antenna Type Logical Interfaces Frequency Range (Min) Frequency Range (Max) Antenna Options Bluetooth Version Compliance Connector Data Rate Max Transmit Power Protocols Range Receive Sensitivity Wireless Specification
BT740-SC Embedded Module Bluetooth Classic, Bluetooth 2.1 AT Commands, Embedded Stack Hosted QCA (CSR) BC04 External Serial, GPIO, ADC 2402 MHz 2480 MHz u.FL Connector v2.1 FCC / IC / CE SMT Up to 2.1 Mbps +18 dBm AT Command Set Up to 1 km Better than -87 dBm Bluetooth v2.1 Enhanced Class 1
Product Type Technology OS/Software System Architecture Chipset (Wireless) Antenna Type Logical Interfaces Frequency Range (Min) Frequency Range (Max) Bluetooth Version Connector Data Rate Max Transmit Power Protocols Range Receive Sensitivity Wireless Specification
DVK-BT740-SA Development Kit Bluetooth Classic, Bluetooth 2.1 AT Commands Hosted QCA (CSR) BC04 Internal USB, PCM, RS232 2402 MHz 2480 MHz v2.1 RS232/USB Up to 2.1 Mbps +18 dBm AT Command Set Up to 1 km Better than -87 dBm Bluetooth v2.1 Enhanced Class 1
Product Type Technology OS/Software System Architecture Chipset (Wireless) Antenna Type Logical Interfaces Frequency Range (Min) Frequency Range (Max) Antenna Options Bluetooth Version Connector Data Rate Max Transmit Power Protocols Range Receive Sensitivity Wireless Specification
DVK-BT740-SC Development Kit Bluetooth Classic, Bluetooth 2.1 AT Commands Hosted QCA (CSR) BC04 External USB, PCM, RS232 2402 MHz 2480 MHz u.FL Connector v2.1 RS232/USB Up to 2.1 Mbps +18 dBm AT Command Set Up to 1 km Better than -87 dBm Bluetooth v2.1 Enhanced Class 1

Certified Antennas

  • WRR Series - WiFi/Bluetooth

    MAF94019

    WRR Series WiFi & Bluetooth Antenna
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  • WTC Series - WiFi Antenna

    MAF94006

    WTC Series - WiFi Antenna
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  • Nano Blue Series - Bluetooth Internal

    MAF94045

    NanoBlue Series Bluetooth Internal Antenna

    2.4 GHz planar antenna with 2 dBi of Gain and an integrated ground plane for ease of integration.

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  • Product & Industrial Design

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Documentation

Name Part Type Last Updated
Application Note - BT7x0 Carrier Board.pdf All Application Note 01/17/2019
Application Note - BT740 Development Kit.pdf All Application Note 01/17/2019
Application Note - Bluetooth Latency and Data.pdf All Application Note 01/17/2019
IC Technical Acceptance Certificate - BT730.pdf All Certification 11/23/2020
Radio Equipment Directive (RED) Updates - May 2017 All Certification 10/30/2020
RoHS 3 - Bluetooth All Certification 11/10/2020
User Guide - BT740 Firmware.pdf All Documentation 01/17/2019
Quick Start Guide - BT740 Development Kit.pdf All Documentation 01/17/2019
Hardware Schematic - BT740 Carrier Board.pdf All Documentation 01/17/2019
Product Brief - BT740.pdf All Brochure 03/04/2019
Datasheet - BT740 Series.pdf All Datasheet 11/22/2020
User Guide - StringPlayer.pdf All Documentation 01/17/2019
Release Note - BT74x v2.3.1.280.pdf All Documentation 01/17/2019
Release-Notes-BTM74x v280.pdf All Software 01/17/2019
ITSE01014 03 BTM74x v2 3 1 280 0 UART Upgrade.zip All Software 01/17/2019
BT7x0-SA SC-asm asm.zip All Software 01/17/2019
MultipointHostSourceLibrary BTM74x.zip All Software 01/17/2019
Bluetooth Development Kit Terminal Download.zip All Software 01/17/2019
MpBtHost v3 5 0.zip All Software 01/17/2019
LairdTerminal v6 9 0.zip All Software 01/17/2019
Application Note - Guidelines for Replacing Antennas v1.0 All Application Note 01/17/2019
EU Certifications - BT730 and BT740 All Certification 11/20/2020
FCC Certifications - BT730 and BT740 All Certification 11/20/2020
ISED Certifications - BT730 and BT740 All Certification 11/20/2020

FAQ

How is power adjusted on the B7xx?

While the power adjustment cannot be done manually, the radio automatically adjusts the Tx power based on the RSSI and Golden Receive Power Range values. For more information on this, please review the following guide: User Guide - BT740 Firmware.pdf

Is it safe to run a Laird Connectivity Bluetooth module through a PCBA wash cycle?

In general, cleaning the populated modules is strongly discouraged. Residuals under the module cannot be easily removed with any cleaning process. 

  • Cleaning with water can lead to capillary effects where water is absorbed into the gap between the host board and the module. The combination of soldering flux residuals and encapsulated water could lead to short circuits between neighboring pads. Water could also damage any stickers or labels.
  • Cleaning with alcohol or a similar organic solvent will likely flood soldering flux residuals into the RF shield, which is not accessible for post-washing inspection. The solvent could also damage any stickers or labels.
  • Ultrasonic cleaning could damage the module permanently.

However, if water washing is required you will need to use deionized water. We do not recommend chemical cleaning and cannot guarantee it will not damage the modules. If you MUST clean PCB with chemicals it is recommended that you test on one board and then confirm the module still works after the process, prior to adding it to production, while understanding the above affects washing the populated PCBs can have on the module.

What is the throughput of your bluetooth modules with the embedded AT command interface?

Our fully-embedded modules have a throughput of around 300-360 kbps.  They have an on-board Bluetooth stack and do all of the Bluetooth processing themselves. Bluetooth 2.1 + EDR has a practical transfer rate of 2.1 Mbit/s, but this is not possible on a small embedded module that does not have a powerful PC-type processor. 

For more information on the throughput of the BT740, see the following application note: BTM44X Enhanced Data Module: Throughput Analysis.  The throughput analysis on the BTM44X is also relevant to the BT740.