BTM441 & BTM443 Series Bluetooth Module

Not Recommended for New Design (NRND)

Overview

The BTM44x series Bluetooth modules from Laird Connectivity 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 MHz
Frequency Range (Min)
2.402 GHz MHz
Logical Interfaces
SMT
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
Transmit Power (Max)
+4 dBm (at antenna pad BTM440/442)
+4 dBm (from integrated antenna BTM441/443)
Weight
.105 oz (3 g)
Part NumberAntenna TypeBluetooth VersionChipset (Wireless)ConnectorDimension (Height - mm)Dimension (Length - mm)Dimension (Width - mm)Frequency Range (Max)Frequency Range (Min)Input PowerLogical InterfacesOS/SoftwarePower ConsumptionProduct TypeProtocolsReceive SensitivitySoftwareSystem ArchitectureTechnologyTransmit Power (Max)Wi-Fi CoexistenceWireless Specification
BTM441
Not Recommended for New Design (NRND)
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Internal v2.1 + EDR QCA (CSR) BC04 SMT 3.4 mm22 mm12.5 mm2480 MHz2402 MHz3.0 - 3.3V Serial AT Commands, Embedded Stack < 40mA Embedded Module AT Command Set -84 dBm Terminal Software Hosted Bluetooth Classic, Bluetooth 2.1 + EDR +4 dBm 2 wire and 3 wire schemes supported Bluetooth v2.1 + EDR
BTM443
Not Recommended for New Design (NRND)
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Internal v2.1 + EDR QCA (CSR) BC04 SMT 3.4 mm22 mm12.5 mm2480 MHz2402 MHz3.0 - 3.3V Serial AT Commands, Embedded Stack < 40mA Embedded Module Multipoint Mode -84 dBm Terminal Software Hosted Bluetooth Classic, Bluetooth 2.1 + EDR +4 dBm 2 wire and 3 wire schemes supported Bluetooth v2.1 + EDR
DVK-BTM443
Not Recommended for New Design (NRND)
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Internal v2.1 + EDR QCA (CSR) BC04 USB Pluggable 3.4 mm22 mm12.5 mm2480 MHz2402 MHz3.0 - 3.3V USB, Serial AT Commands < 40mA Development Kit Multipoint Mode -84 dBm Terminal Software Hosted Bluetooth Classic, Bluetooth 2.1 + EDR +4 dBm 2 wire and 3 wire schemes supported Bluetooth v2.1 + EDR
DVK-BTM441
Not Recommended for New Design (NRND)
Internal v2.1 + EDR QCA (CSR) BC04 USB Pluggable 3.4 mm22 mm12.5 mm2480 MHz2402 MHz3.0 - 3.3V USB, Serial AT Commands < 40mA Development Kit AT Command Set -84 dBm Terminal Software Hosted Bluetooth Classic, Bluetooth 2.1 + EDR +4 dBm 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 01/17/2019
RoHS 3 - Bluetooth All Certification 01/04/2022
Application Note - BT44x Series HID Host.pdf All Documentation 01/17/2019
Application Note - BTM44x-RF Testing.pdf All Documentation 01/17/2019
Application Note - BTM44x Enhanced Data Module-Latency Optimization.pdf All Documentation 01/17/2019
Application Note - BTM44x Health Device Profile.pdf All Documentation 01/17/2019
Application Note - BTM44x Enhanced Data Module-Throughput Analysis.pdf All Documentation 01/17/2019
Application Note - BTM44x-Firmware Upgrade.pdf All Documentation 01/17/2019
Application Note - BTM44x Getting Started.pdf All Documentation 09/28/2022
Release Note - BTM44x Enhanced Data Module Firmware v240.pdf All Documentation 01/17/2019
User Guide - BTM44x Modules.pdf All Documentation 01/17/2019
Mini Dev Kit Comms - BTM41x BTM43x BTM44x v1.pdf All Documentation 01/17/2019
PCN - BTM4x1 Label Change - 12 Aug 15.pdf All Documentation 01/17/2019
Product Brief - BTM44x.pdf All Product Brief 10/12/2021
Datasheet (HIG) - BTM44x Series.pdf All Datasheet 03/04/2019
ITSE00099 05 BTM44x v1 3 1 240 0 UartFirmwareUpgrade.zip All Software 01/17/2019
BTM44x v1 3 1 240 0 UartFirmwareUpgrade.zip All Software 01/17/2019
MultipointHostSourceLibrary BTM44x.zip All Software 01/17/2019
Bluetooth Development Kit Terminal Download.zip All Software 01/17/2019
Application Note - Guidelines for Replacing Antennas v1.0 All Application Note 01/17/2019
EU Certifications - BTM4xx All Certification 02/16/2021
FCC Certifications - BTM41x All Certification 11/23/2020
ISED (Canada) Certifications - BTM41x All Certification 11/23/2020
MIC Certifications - BTM41x All Certification 11/23/2020
Regulatory Information - BTM4xx All Certification 02/15/2021

FAQ

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 Laird Connectivity's product lifecycle EOL and PCN policy?

Laird Connectivity is committed to the long-term supply of all its standard embedded wireless modules and packaged products. Laird Connectivity’s products are specifically designed to meet the needs of the industrial and medical markets, which typically require 7 – 10 years product lifecycle. Although Laird Connectivity can’t guarantee that a component used in our products will not be obsoleted and cannot be reasonably substituted, Laird Connectivity can assure customers we will continue to sell our product when we have customer demand and can obtain the necessary components to build our products.

View our full policy here. 

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.

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

Become a Laird Connectivity Customer and Gain Exclusive Access to Our Design Services Team

  • Antenna Scans
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  • Custom antenna design
  • Worldwide EMC testing / certifications
  • Embedded RF hardware / firmware design
  • Cloud architecture and integration
  • Mobile application development
  • Product & Industrial Design

Talk to an Expert

Buy Now

Distributor Part In Stock Region Buy
Avnet BTM441 0 North America Buy Now
Digi-Key BTM443 6464 North America Buy Now
Mouser BTM443 681 North America Buy Now
Farnell BTM443 0 EMEA Buy Now
Digi-Key DVK-BTM443 40 North America Buy Now
Avnet DVK-BTM443 0 North America Buy Now
Farnell DVK-BTM443 0 EMEA Buy Now

Distributors

Distributor Phone Number Region Website
Alpha Micro UK Only +44 1256-851770
EMEA Website
Arrow Electronics 1-855-326-4757
+44 2039 365486
APAC, North America, South America, EMEA Website
Avnet 1-480-643-2000
+44 1628 512900
APAC, North America, South America, EMEA Website
Cal-Chip Connect 1-215-942-8900
North America Website
Control Synergy +61-2-4966-5211
APAC Website
Digi-Key 1-800-344-4539
North America, South America, APAC, EMEA Website
EBV Elektronik EMEA Website
Farlink Technology +86 13266922199
APAC Website
Farnell 1-800-936-198
+44 3447 11 11 22
EMEA Website
Future Electronics 1-800-675-1619
1-514-428-8470
North America, South America, APAC, EMEA Website
Glyn +49-6126-590-0
EMEA Website
Jetronic China, Hong Kong and Taiwan 852-27636806 
APAC Website
Laird Connectivity 1-847-839-6925
+44 1628 858941
North America, South America, APAC, EMEA Website
M2M Germany +49-6081-587386-0
EMEA Website
Martinsson +46 8 7440300
EMEA Website
McCoy South East Asia +65 6515 2988
APAC Website
Mouser 1-800-346-6873
+44 1494 427500
North America, South America, APAC, EMEA Website
RS Components +852-2421-9898
+44 3457-201201
North America, South America, APAC, EMEA Website
Ryoyo Japan +81-3-3543-7711
APAC Website
Symmetry Electronics 1-866-506-8829
North America Website
Tekdis Australia and New Zealand +61 3 8669 1210
APAC Website
Telsys +972 3 7657666
EMEA Website