Overview

The BTM44x series Bluetooth modules from Laird have been designed to meet the needs of developers who wish to add robust, short-range Bluetooth data connectivity to their products. They are based on the market-leading Cambridge Silicon Radio BC04 chipset, providing exceptionally low power consumption with outstanding range. These modules support the latest Bluetooth Version 2.1 Specification, providing the important advantage of Secure Simple Pairing, which improves security and enhances the ease of use for end customers. In addition to Serial Port Profile, the BTM44x series features a number of additional features and profiles not found on other Bluetooth modules. Available in BTM440, BTM441, BTM442, and BTM443 variants.

Specifications

Bluetooth Version
v2.1 + EDR
Antenna Options
Integrated antenna or External via Trace Pin
Chipset
CSR BC04
BT Class
Class 2
Connector Type
SMT
Development Kit Contents
Development board and software tools
Dimension (Height - mm)
3.4 mm
Dimension (Length - mm)
22 mm
Dimension (Width - mm)
12.5 mm
Frequency Range (Max)
2.480 GHz
Frequency Range (Min)
2.402 GHz
Logical Interfaces
SMT
Max Transmit Power
+4 dBm (at antenna pad BTM440/442)
+4 dBm (from integrated antenna BTM441/443)
Other
Up to seven slave devices supported (throughput is limited in multipoint mode)
Profiles
Serial Port Profile (SPP), Human Interface Device Profile (HID), Health Device Profile (HDP)
Protocols
AT Command Set
Range
Up to 30 meters
Receive Sensitivity
Better than -84 dBm
Weight
.105 oz (3 g)
Antenna Connector Type Chipset (Wireless) Connector Type Dimension (Height - mm) Dimension (Length - mm) Dimension (Width - mm) Frequency Range (Max) Frequency Range (Min) Input Power Logical Interfaces Max Transmit Power Power Consumption Protocols Receive Sensitivity Wi-Fi Coexistence Wireless Specification Software Bluetooth Version
BTM441 Integrated Antenna CSR BC04 SMT 3.4 mm 22 mm 12.5 mm 2.480 GHz 2.402 GHz 3.0 – 3.3V UART +4 dBm < 40mA AT Command Set -84 dBm 2 wire and 3 wire schemes supported Bluetooth v2.1 + EDR Terminal Software v2.1 + EDR
Antenna Connector Type Bluetooth Version Chipset (Wireless) Connector Type Dimension (Height - mm) Dimension (Length - mm) Dimension (Width - mm) Frequency Range (Max) Frequency Range (Min) Input Power Logical Interfaces Max Transmit Power Power Consumption Protocols Receive Sensitivity Software Wi-Fi Coexistence Wireless Specification
BTM443 Integrated Antenna v2.1 + EDR CSR BC04 SMT 3.4 mm 22 mm 12.5 mm 2.480 GHz 2.402 GHz 3.0 – 3.3V UART +4 dBm < 40mA Multipoint Mode -84 dBm Terminal Software 2 wire and 3 wire schemes supported Bluetooth v2.1 + EDR
Antenna Connector Type Bluetooth Version Chipset (Wireless) Connector Type Frequency Range (Max) Frequency Range (Min) Logical Interfaces Max Transmit Power Protocols Receive Sensitivity Software Wi-Fi Coexistence Wireless Specification Input Power Power Consumption Dimension (Height - mm) Dimension (Length - mm) Dimension (Width - mm)
DVK-BTM443 Integrated Antenna v2.1 + EDR CSR BC04 USB Pluggable 2.480 GHz 2.402 GHz UART +4 dBm Multipoint Mode -84 dBm Terminal Software 2 wire and 3 wire schemes supported Bluetooth v2.1 + EDR 3.0 – 3.3V < 40mA 3.4 mm 22 mm 12.5 mm
Antenna Connector Type Bluetooth Version Chipset (Wireless) Connector Type Dimension (Height - mm) Dimension (Length - mm) Dimension (Width - mm) Frequency Range (Max) Frequency Range (Min) Input Power Logical Interfaces Max Transmit Power Power Consumption Protocols Receive Sensitivity Software Wi-Fi Coexistence Wireless Specification
DVK-BTM441 Integrated Antenna v2.1 + EDR CSR BC04 USB Pluggable 3.4 mm 22 mm 12.5 mm 2.480 GHz 2.402 GHz 3.0 – 3.3V UART +4 dBm < 40mA AT Command Set -84 dBm Terminal Software 2 wire and 3 wire schemes supported Bluetooth v2.1 + EDR

Documentation

Name Part Type Last Updated
Application Note - Bluetooth Latency and Data.pdf All Application Note 01-17-19
EN 60950-1 - BTM440.pdf All Certification 01-17-19
EN 301 489 - BTM440.pdf All Certification 01-17-19
FCC 15C (SST) Grant - BTM4x1.pdf All Certification 01-17-19
BTM400 Series DoC Sep2014.pdf All Certification 01-17-19
CE - EN 60950-1 LVD Grant (BTM4x1).pdf.pdf All Certification 01-17-19
CE - EN 62479 RF Exposure Test Report (BTM4x1).pdf All Certification 01-17-19
CE - EN 301 489-1-17 WLAN Test Report (BTM4x1).pdf All Certification 01-17-19
CE - EN 60950-1 LVD Test Report (BTM4x1).pdf All Certification 01-17-19
BTM461 BTM443 BTM441 IC certificate) ACB-IC 1931B-BTM411 Certificate.pdf All Certification 02-04-19
IC 1931B - BTM4xx Certificate.pdf All Certification 01-17-19
IC certificate - BTM461 BTM44x ACB-IC 1931B-BTM411.pdf All Certification 01-17-19
EU Declaration of Conformity - BTM4xx - 2017.pdf All Certification 01-17-19
EN 300 328 (2.4 GHz) BT EDR V1.9.1 - BTM4xx.pdf All Certification 01-17-19
EN 62311 - RF Exposure - BTM4xx.pdf All Certification 01-17-19
Radio Equipment Directive (RED) Updates - May 2017 All Certification 03-01-19
Draft EN 301 489-1-17 WLAN - BTM4xx.pdf All Certification 01-17-19
EN 50385 and 62311 - RF Exposure - BTM4xx.pdf All Certification 01-17-19
EN 300 328 V2.1.1 2.4G BT EDR - BTM4xx.pdf All Certification 02-04-19
RoHSII - EU WEEE Compliance BT RAMP v1 8 All Certification 07-12-19
Application Note - BT44x Series HID Host.pdf All Documentation 01-17-19
Application Note - BTM44x-RF Testing.pdf All Documentation 01-17-19
Application Note - BTM44x Enhanced Data Module-Latency Optimization.pdf All Documentation 01-17-19
Application Note - BTM44x Health Device Profile.pdf All Documentation 01-17-19
Application Note - BTM44x Enhanced Data Module-Throughput Analysis.pdf All Documentation 01-17-19
Application Note - BTM44x-Firmware Upgrade.pdf All Documentation 01-17-19
Application Note - BTM44x Getting Started.pdf All Documentation 01-17-19
Release Note - BTM44x Enhanced Data Module Firmware v240.pdf All Documentation 01-17-19
User Guide - BTM44x Modules.pdf All Documentation 01-17-19
Mini Dev Kit Comms - BTM41x BTM43x BTM44x v1.pdf All Documentation 01-17-19
PCN - BTM4x1 Label Change - 12 Aug 15.pdf All Documentation 01-17-19
Product Brief - BTM44x.pdf All Brochure 03-04-19
Datasheet (HIG) - BTM44x Series.pdf All Datasheet 03-04-19
ITSE00099 05 BTM44x v1 3 1 240 0 UartFirmwareUpgrade.zip All Software 01-17-19
BTM44x v1 3 1 240 0 UartFirmwareUpgrade.zip All Software 01-17-19
MultipointHostSourceLibrary BTM44x.zip All Software 01-17-19
Bluetooth Development Kit Terminal Download.zip All Software 01-17-19
BTM44x v1 3 1 240 0 UartFirmwareUpgrade.zip All Software 01-17-19
Application Note - Guidelines for Replacing Antennas v1.0 All Application Note 01-17-19

FAQ

BT 2.1 - SSP initiated by a BTM module

This article is designed to illustrate the process of Simple Secure Pairing (SSP) when initiated from a BTM module. Introduced in Bluetooth v2.1, SSP creates a bond in a very different way than the legacy PIN pairing many users are familiar with. This is demonstrated both for security level 2 (default) and security level 3.

Security Level = 2

Assumptions:

peer device is BT2.1 (supporting secure simple pairing)

security level of BTM device is

security level of peer device is

the pairing initiating device is aware of the peer device's Bluetooth Device Address

Note:  Connections in Bluetooth v2.1 are always encrypted.

 

Figure 1:  BTM vs BTM

Figure 2:  BTM vs PC

Security Level = 3

Assumptions:

peer device is BT2.1 (supporting secure simple pairing)

at least one device with security level = 3 (MITM protection / authentication enabled)

the pairing initiating device is aware of the peer device's Bluetooth Device Address

Remarks:

Connections with BT2.1 are always encrypted

"MITM" = Man-In-The-Middle. "MITM protection" means "protection against a MITM attack".

MITM protection is equivalent with authentication

Figure 3:  BTM vs BTM, security level 3

Figure 4: BTM vs PC, security level 3

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.