BT740 Series Bluetooth Module
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.
Specifications
UART: Over 350kbps
GPIO (8 configurable lines)
ADC (2 lines, 8 bit resolution)
Transmit (Max Data) – 35mA
Multi-Point API - 7 simultaneous connections
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 |
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Documentation
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.