Overview

Every BT740 series Bluetooth module from Laird 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.

Specifications

Bluetooth Version
2.1
Antenna Options
Integrated or External via u.FL
Chipset
CSR BC04
BT Class
Class 1
Certifications
FCC, IC, CE
Compliance
Lead-free and RoHS compliant
Data Rate
Over the Air: Up to 2.1Mbps
UART: Over 350kbps
Dimension (Height - mm)
15.29 mm
Dimension (Length - mm)
28.71 mm
Dimension (Width - mm)
3 mm
Logical Interfaces
UART (TX, RX, DCD, RI, DTR, DSR, CTS, RTS)
GPIO (8 configurable lines)
ADC (2 lines, 8 bit resolution)
Max Transmit Power
18dBm from antenna
Operating Temp - Max (°C)
+85 °C
Operating Temp - Min (°C)
-40 °C
Output Power
18 dBm
Power Consumption
Idle Mode – 1.25mA
Transmit (Max Data) – 35mA
Profiles
Serial Port Profile (SPP), Human Interface Device (HID), Health Device Profile )HDP)
Protocols
AT Command Set - 1 connection
Multi-Point API - 7 simultaneous connections
Range
Up to 1000m
Receive Sensitivity
> -87dBm
Stack On Board
Yes
Storage Temp - Max (°C)
+85 °C
Storage Temp - Min (°C)
-40 °C
Voltage
Supply: 3.3 – 5.0V
I/O: 3.3V
Antenna Options Bluetooth Version Chipset (Wireless) Compliance Connector Type Data Rate Frequency Frequency Range (Max) Frequency Range (Min) Logical Interfaces Max Transmit Power Protocols Range Receive Sensitivity Wireless Specification
BT740-SC u.FL Connector v2.1 CSR BC04 FCC / IC / CE SMT Up to 2.1 Mbps 2.4 GHz 2.480 GHz 2.402 GHz UART +18 dBm AT Command Set Up to 1 km Better than -87 dBm Bluetooth v2.1 Enhanced Class 1
Antenna Options Bluetooth Version Chipset (Wireless) Compliance Connector Type Data Rate Frequency Frequency Range (Max) Frequency Range (Min) Logical Interfaces Max Transmit Power Protocols Range Receive Sensitivity Wireless Specification
BT740-SA Internal Antenna v2.1 CSR BC04 FCC / IC / CE SMT Up to 2.1 Mbps 2.4 GHz 2.480 GHz 2.402 GHz UART +18 dBm AT Command Set Up to 1 km Better than -87 dBm Bluetooth v2.1 Enhanced Class 1
Antenna Options Bluetooth Version Chipset (Wireless) Connector Type Data Rate Frequency Frequency Range (Max) Frequency Range (Min) Logical Interfaces Max Transmit Power Protocols Range Receive Sensitivity Wireless Specification
DVK-BT740-SA Internal Antenna v2.1 CSR BC04 RS232/USB Up to 2.1 Mbps 2.4 GHz 2.480 GHz 2.402 GHz USB +18 dBm AT Command Set Up to 1 km Better than -87 dBm Bluetooth v2.1 Enhanced Class 1
Antenna Options Bluetooth Version Chipset (Wireless) Connector Type Data Rate Frequency Frequency Range (Max) Frequency Range (Min) Logical Interfaces Max Transmit Power Protocols Range Receive Sensitivity Wireless Specification
DVK-BT740-SC u.FL Connector v2.1 CSR BC04 RS232/USB Up to 2.1 Mbps 2.4 GHz 2.480 GHz 2.402 GHz USB +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
    Learn More
  • WTC Series - WiFi Antenna

    MAF94006

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

    MAF94045

    Nano Blue Series - Bluetooth Internal
    Learn More

Documentation

Name Part Type Last Updated
Application Note - BT7x0 Carrier Board.pdf All Application Note 01-17-19
Application Note - BT740 Development Kit.pdf All Application Note 01-17-19
Application Note - Bluetooth Latency and Data.pdf All Application Note 01-17-19
IC Test Report CR332501 - BT7x0 - FCC 15.247 Bluetooth EDR.pdf All Certification 01-17-19
EN 60950-1 - BT7x0.pdf All Certification 01-17-19
EN 301 489-1, EN 301 489-17 - BT7x0.pdf All Certification 01-17-19
IC Technical Acceptance Certificate - BT730.pdf All Certification 01-17-19
EN 300 328 (2.4 GHz) BT EDR - BT7x0.pdf All Certification 01-17-19
EU Declaration of Conformity - BT7x0 - 2017.pdf All Certification 01-17-19
FCC RF Exposure Report - BT7xx.pdf All Certification 01-17-19
FCC 15B plus ICES-003 - BT7xx.pdf All Certification 01-17-19
FCC 15.247 BT EDR - BT7xx.pdf All Certification 01-17-19
FCC Grant - BT7xx.pdf All Certification 01-17-19
EN 62311 RF Exposure Report - BT7x0.pdf All Certification 01-17-19
Radio Equipment Directive (RED) Updates - May 2017 All Certification 03-01-19
RoHSII - EU WEEE Compliance BT RAMP v1 8 All Certification 07-12-19
User Guide - BT740 Firmware.pdf All Documentation 01-17-19
Quick Start Guide - BT740 Development Kit.pdf All Documentation 01-17-19
Hardware Schematic - BT740 Carrier Board.pdf All Documentation 01-17-19
Product Brief - BT740.pdf All Brochure 03-04-19
Datasheet - BT740 Series.pdf All Datasheet 03-04-19
User Guide - StringPlayer.pdf All Documentation 01-17-19
Release Note - BT74x v2.3.1.280.pdf All Documentation 01-17-19
Release-Notes-BTM74x v280.pdf All Software 01-17-19
ITSE01014 03 BTM74x v2 3 1 280 0 UART Upgrade.zip All Software 01-17-19
BT7x0-SA SC-asm asm.zip All Software 01-17-19
MultipointHostSourceLibrary BTM74x.zip All Software 01-17-19
Bluetooth Development Kit Terminal Download.zip All Software 01-17-19
MpBtHost v3 5 0.zip All Software 01-17-19
LairdTerminal v6 9 0.zip All Software 01-17-19
Application Note - Guidelines for Replacing Antennas v1.0 All Application Note 01-17-19

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

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.