Overview

Every BTM46x series Bluetooth module from Laird is designed to add robust, short-range Bluetooth data connectivity to any device. The BTM46x modules build on the proven BTM44x series of module hardware based on the market-leading Cambridge Silicon Radio (CSR) BC04 chipset. The innovative firmware on the BTM46x series allows OEMs to seamlessly support Bluetooth data connectivity for all PCs, smartphones, and tablets including Apple iOS devices. The BTM46x modules are approved by Apple as part of their MFi program (Made for iPod / iPhone / iPad).

Note: The BTM461-xx has reached end of production and is available on a limited basis only. Find the End of Life Announcement in the Documentation tab below.

Specifications

Bluetooth Version
v2.1 + EDR
Connector Type
SMT
Dimension (Height - mm)
3.4 mm
Dimension (Length - mm)
22 mm
Dimension (Width - mm)
12.5 mm
Frequency
2.402 - 2.480 G
Logical Interfaces
SMT
Max Transmit Power
Class 2 +4 dBm from antenna (BTM461)
Profiles
SPP - Serial Port ProfileHID - Human Interface DeviceiAP - Apple’s iPod Accessory Protocol
Protocols
AT Command Set Multi-Point API
Range
Up to 30 metres
Receive Sensitivity
Better than -84 dBm
Weight
.105 oz (3 g)
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 Development Kit Contents
BTM461 Embedded Module Bluetooth Classic, Bluetooth 2.1 + EDR AT Commands, iOS Hosted QCA (CSR) BC04 Internal SMT 2402 MHz 2480 MHz v2.1 + EDR FCC/IC/CE/MIC SMT 2.1 MBps Development board and software tools
Product Type Technology OS/Software System Architecture Chipset (Wireless) Antenna Type Logical Interfaces Frequency Range (Min) Frequency Range (Max) Bluetooth Version Connector Data Rate
DVK-BTM461 Development Kit Bluetooth Classic, Bluetooth 2.1 + EDR AT Commands, iOS Hosted QCA (CSR) BC04 Internal USB, Serial 2402 MHz 2480 MHz v2.1 + EDR USB Pluggable 2.1 MBps

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BTM461

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Documentation

Name Part Type Last Updated
BTM461 BTM443 BTM441 IC certificate) ACB-IC 1931B-BTM411 Certificate.pdf All Certification 02/04/2019
IC 1931B - BTM4xx Certificate.pdf All Certification 01/17/2019
IC certificate - BTM461 BTM44x ACB-IC 1931B-BTM411.pdf All Certification 01/17/2019
EN 300 328 (2.4 GHz) BT EDR V1.9.1 - BTM4xx.pdf All Certification 01/17/2019
EN 62311 - RF Exposure - BTM4xx.pdf All Certification 01/17/2019
Radio Equipment Directive (RED) Updates - May 2017 All Certification 03/01/2019
RoHSII - EU WEEE Compliance BT RAMP v1 8 All Certification 07/12/2019
EOL - Bluetooth - Nov-15-2015.pdf All Documentation 01/17/2019
Product Brief - BTM46x.pdf All Documentation 01/17/2019
BTM461 BTM443 BTM441 IC certificate) ACB-IC 1931B-BTM411 Certificate.pdf BTM461 Certification 02/04/2019
IC 1931B - BTM4xx Certificate.pdf BTM461 Certification 01/17/2019
IC certificate - BTM461 BTM44x ACB-IC 1931B-BTM411.pdf BTM461 Certification 01/17/2019
EN 300 328 (2.4 GHz) BT EDR V1.9.1 - BTM4xx.pdf BTM461 Certification 01/17/2019
EN 62311 - RF Exposure - BTM4xx.pdf BTM461 Certification 01/17/2019
Radio Equipment Directive (RED) Updates - May 2017 BTM461 Certification 03/01/2019
RoHSII - EU WEEE Compliance BT RAMP v1 8 BTM461 Certification 07/12/2019
EOL - Bluetooth - Nov-15-2015.pdf BTM461 Documentation 01/17/2019
Product Brief - BTM46x.pdf BTM461 Documentation 01/17/2019

FAQ

Are Laird's BT/ BLE Modules "Intrinsically Safe"?

Yes it is possible that Laird's BLE modules could be utilized in a end device that is certified as"Intrinsically Safe". We do not currently have any end customers doing this with all of Laird's BT/BLE modules, some of our BT/BLE modules have been successfully certified by our customers. As a valuable point of information, Intrinsically Safe certifications are detailed and extensive, requiring NDA restricted information on our modules which we can support based on the commercial opportunity. The detailed analysis and testing of the end production solution is the responsibility of the end customer working with their certified test house. 

Do we recommend conformal coating your modules?

We highly do not recommend conformal coating the radio module. If you plan on encapsulating the radio module in a potting compound or conformal coating, you must assure that the compound in liquid or solid form does not enter under the shield where there are sensitive RF components. Some of the capacitive and inductance values are as low (pF and nH) and could be sensitive to contacting materials such as potting compounds. There are potting compounds and conformal coatings which have very good dielectric constants and are suitable for 2.4 GHz potting applications, however, when you apply any of these, they were not accounted for in the circuit design and might reduce performance of the device (or all together cause it not to function).  You should run tests on their particular potting compound and evaluate radio's performance and range.  Also, it's worth mentioning that applying any compound, conformal coating or potting directly to the module WILL void the warranty. If your application requires 100% sealing of the radio module, there is a way to do this very successfully without impacting the module performance. Simply place the module on your PCB. Place a plastic cover over the module (like a hat), make the cover large enough to cover the whole module. Apply glue around the bottom perimeter of the cover where it sits on the PCB. This allows the module to function in free air-space while there is a complete seal around it. This information is only for reference and we recommend you should conduct your own testing with your prototype of your end application to find the best suitable fit for your design.  

How many reflows do you recommend for your modules?

We only recommend reflowing our modules once as it can damage the module and void the warranty.

What are the available CAD file formats?

Laird Connectivity provides layout files PADS and PADS ASCII formats. The ASCII files will import to Altium (and Protel varients) as well as Cadence (Orcad and Allegro) CAD packages. As far as we know, there is no way to import to Eagle CAD. Please be sure to use the .asc file for PCB and the .txt file for the schematic when importing to Altium. Laird Connectivity uses ORCAD for schematics (Gerbers). 

What criteria should be confirmed when soldering Bluetooth modules?

The factors to confirm when checking the soldering job on Bluetooth modules are solder stencil aperture size, solder stencil thickness, solder ball size, solder type, and the MSL guidelines. If the parts have been left out for too long then the modules should be baked to remove any moisture prior to soldering. If there are any failures, we highly recommend providing an x-ray of the module.

What is the recommendation for washing BT/BLE modules?

We recommend using de-ionized water. Additionally, we recommend avoiding any sonic vibration, heat, and pressure washing as well as any other soaps/chemicals.

What's the recommended process to clean modules?

The recommended cleanser is "hydrocarbon cleaning oil", which can be used to clean the RF shield and PCB. We do not recommend the use of alcohol as it doesn't work as well and could leave residue on the boards.  

Who is responsible for providing the Bluetooth QDID for a host system?

The responsability for providing the QDID for a host system is with the provider of the stack that is used on that system. If for instance the host system uses a module that requires the Bluetooth stack to run on that system (e.g. Lairds Sterling-LWB in a Linux platform) the QDID must be provided by the stack vendor whos stack is running on that Linux platform. Challenges might occur when an open-source, community based stack is used. If a module with integrated stack us used (e.g. Lairds BL652) the QDID is provided by the module vendor.  

 

 

Does Laird Connectivity provide 3D files for modules?

Laird Connectivity provides 3D files (STEP) files for most but not all of it's modules.  Based on the nature of the information in the files, in most cases Laird requires a login to access these files as well as layout files and software/firmware downloads.  As such, for most modules, the 3D files are found under the Software Downloads tab of the product page.  The page offers a credentials request link for customers who need credentials.  In most cases, the credentials are provided via return email within about 10 minutes. Please contact support if you have any additional questions or have any issues accessing our downloads.