BTM411 Series Bluetooth Module

Not Recommended for New Design (NRND)

Overview

The BTM411 Bluetooth module from Laird Connectivity has 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. They 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. BTM411 variants available.

Note: The BTM410 has reached end of production and is available on a limited basis only. Only the BTM410 part numbers are affected. Find the End of Life Announcement in the Documentation tab below.

Specifications

Antenna Options
Integrated antenna or External via Trace Pin
Bluetooth Version
v2.1 + EDR
Chipset
CSR BC04
Compliance
FCC, ISED, EU
Connector Type
Multilayer ceramic
Data Rate
Over the Air: Up to 2.1 Mbps
UART: Greater than 300 Kbps
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
2.402 - 2.480 G
Logical Interfaces
UART (CTS, RTS, DRT, DSR, DCD, RI)
GPIO (8 lines shared)
Operating Temp (Max) (°C)
+85 °C
Operating Temp (Min) (°C)
-40 °C
Power Consumption
Less than 40 mA during SCO transmission
Idle (sleep) < 1 mA
Profiles
SPP – Serial Port Profile
Voice over SCO via a PCM interface
Protocols
AT Command Set
Range
Up to 30 meters
Receive Sensitivity
> -84 dBm
Storage Temp (Max) (°C)
+85
Storage Temp (Min) (°C)
-40
Transmit Power (Max)
Class 2, +4 dBm (from integrated antenna)
Voltage
Supply: 3.0 V to +3.3 V
I/O: 1.7 V to +3.6 V (independent of VCC)
Weight
.105 oz (3 g)
Wi-Fi Coexistence
2 wire and 3 wire schemes supported
Part NumberAntenna TypeBLE ServicesBluetooth VersionChipset (Wireless)ComplianceConnectorData RateDevelopment Kit ContentsDimension (Height - mm)Dimension (Length - mm)Dimension (Width - mm)Frequency Range (Max)Frequency Range (Min)Input PowerLogical InterfacesOS/SoftwarePower ConsumptionProduct TypeProtocolsRangeReceive SensitivitySoftwareSystem ArchitectureTechnologyTransmit Power (Max)WeightWi-Fi CoexistenceWireless Specification
BTM411
Not Recommended for New Design (NRND)
Buy Now
Internal GAP v2.1 + EDR QCA (CSR) BC04 FCC, ISED, EU SMT 2.1 MBps Development board and software tools 3.4 mm22 mm12.5 mm2480 MHz2402 MHz3.0 - 3.3V Serial, GPIO AT Commands 32mA Embedded Module AT Command Set Up to 30 meters -84 dBm Terminal Software Hosted Bluetooth Classic, Bluetooth 2.1 + EDR +4 dBm .105 oz (3 g) 2 wire and 3 wire schemes supported Bluetooth v2.1 + EDR
BTM411-03
Not Recommended for New Design (NRND)
Buy Now
Internal GAP v2.1 + EDR QCA (CSR) BC04 FCC, ISED, EU SMT 2.1 MBps Development board and software tools 3.4 mm22 mm12.5 mm2480 MHz2402 MHz3.0 - 3.3V Serial, GPIO AT Commands, Embedded Stack 32mA Embedded Module AT Command Set Up to 30 meters -84 dBm Terminal Software Hosted Bluetooth Classic, Bluetooth 2.1 + EDR +4 dBm .105 oz (3 g) 2 wire and 3 wire schemes supported Bluetooth v2.1 + EDR
BTM411-03-T/R
Not Recommended for New Design (NRND)
Buy Now
Internal GAP v2.1 + EDR QCA (CSR) BC04 FCC, ISED, EU SMT 2.1 MBps Development board and software tools 3.4 mm22 mm12.5 mm2480 MHz2402 MHz3.0 - 3.3V Serial, GPIO AT Commands, Embedded Stack 32mA Embedded Module AT Command Set Up to 30 meters -84 dBm Terminal Software Hosted Bluetooth Classic, Bluetooth 2.1 + EDR +4 dBm .105 oz (3 g) 2 wire and 3 wire schemes supported Bluetooth v2.1 + EDR
DVK-BTM411
Not Recommended for New Design (NRND)
Buy Now
Internal GAP v2.1 + EDR QCA (CSR) BC04 USB Pluggable 2.1 MBps 2480 MHz2402 MHzUSB, Serial AT Commands Development Kit AT Command Set Up to 30 meters -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 - BTM41x Low Power.pdf All Application Note 01/17/2019
Application Note - Absolute Current Ratings BTM41x.pdf All Application Note 01/17/2019
Application Note - Bluetooth Latency and Data.pdf All Application Note 01/17/2019
RoHS Statement of Compliance - BTM411.pdf All Certification 01/17/2019
RoHS 3 - Bluetooth All Certification 01/11/2024
User Guide - BTM41x Modules.pdf All Documentation 01/17/2019
Quick Start Guide - BTM41x Development Kit.pdf All Documentation 01/17/2019
Mini Dev Kit Comms - BTM41x BTM43x BTM44x v1.pdf All Documentation 01/17/2019
Quick Start Guide - BTM411 Development Kit SPP.pdf All Documentation 01/17/2019
Release Notes - BTM41x Firmware version 16.1.3.0.pdf All Documentation 01/17/2019
PCN - BTM4x1 Label Change - 12 Aug 15.pdf All Documentation 01/17/2019
EOL - Bluetooth - Nov-15-2015.pdf All Documentation 01/17/2019
Product Brief - BTM41X Modules.pdf All Product Brief 03/01/2019
Datasheet - BTM41x Modules.pdf All Datasheet 02/15/2021
Deploy BTM41x V16.1.3.0.zip All Software 01/17/2019
BTM41x.zip All Software 01/17/2019
Bluetooth Development Kit Terminal Download.zip All Software 01/17/2019
BTM41x Software Version 16.1.3.0.zip All Software 01/17/2019
Application Note - Guidelines for Replacing Antennas v1.0 All Application Note 01/17/2019
MIC Certifications - BTM41x All Certification 11/23/2020
FCC Certifications - BTM41x All Certification 11/23/2020
ISED (Canada) Certifications - BTM41x All Certification 11/23/2020
EU Certifications - BTM4xx All Certification 12/01/2022
Regulatory Information - BTM4xx All Certification 02/17/2021

FAQ

CSR Bluesuite Bluetest3 crashes when trying to select the transport.

Bluesuite is a very old program supplied by CSR for testing and configuration of its legacy Bluetooth modules. Bluesuite Bluetest3 is often used for RF testing where the DUT is put into BCSP mode before running Blutest3.

If Bluetest3 crashes with an "array" error you may have a conflict or issue with your .net installation. You may be able to fix the issue by removing all versions of .net but please speak to your IT department first as this may cause issues with other software.

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.

Is Sniff Mode supported only as a Slave or as a master or Slave in the BTM41x and BTM51x modules?

Based on a scenario between two BTM41x modules (referenced in the BTM41x Low Power Modes Application Note), the role of a device (master/slave) does not have an impact on sniff mode. In the scenario, sniff mode requests were accepted with requested parameters and were applied on the link, regardless of which end they were initiated from. Thus, at least one end must actively request sniff mode at some point after a connection has been created and the other end must at least not reject sniff mode. If the other end requests sniff mode as well, then the parameters of the most recent request will apply to the link.

Again, this has been done between two BTM41x modules. The relevant source code from this scenario was later ported across to the BTM51x. Confirming tests and measurements have not been carried out on the BTM51x. However, there is no obvious reason why it should behave differently on the BTM51x.

Please note that sniff configuration refers to Rfcomm based links :SPP, HSP, HFP. For AVRCP/A2DP there are some a default setting.

It should be possible to evaluate if a remote device requests sniff mode: Disable local sniff mode by setting Sniff parameters to zero (S561- S564, by default these are zero) and while in a connection check ATi13 repeatedly. If the response is ‘1: b,c,d,e’ then sniff mode has been entered, caused by the remote end. The resulting sniff parameters (b,c,d,e) are likely to be the ones requested by the remote end.

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

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Talk to an Expert

Buy Now

Distributor Part In Stock Region Buy
Future Electronics BTM411 0 North America Buy Now
Mouser BTM411 0 North America Buy Now
DigiKey BTM411-03 82 North America Buy Now
Avnet BTM411-03 0 North America Buy Now
Avnet BTM411-03 0 North America Buy Now
DigiKey BTM411-03 0 North America Buy Now
Future Electronics BTM411-03 0 North America Buy Now
Future Electronics BTM411-03 0 North America Buy Now
Symmetry Electronics BTM411-03 0 North America Buy Now
Avnet BTM411-03-T/R 0 North America Buy Now
DigiKey BTM411-03-T/R 0 North America Buy Now
DigiKey BTM411-03-T/R 0 North America Buy Now
Symmetry Electronics BTM411-03-T/R 0 North America Buy Now
DigiKey DVK-BTM411 4 North America Buy Now
DigiKey DVK-BTM411 1 North America Buy Now
Avnet DVK-BTM411 0 North America Buy Now
Future Electronics DVK-BTM411 0 North America Buy Now
Mouser DVK-BTM411 0 North America 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
Braemac Australia, New Zealand, South East Asia +61 2 9550 6600
+64 9 477 2148
APAC Website
Cal-Chip Connect 1-215-942-8900
North America Website
DigiKey 1-800-344-4539
North America, South America, APAC, EMEA Website
EBV Elektronik EMEA Website
Farlink Technology China, Hong Kong +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
Solsta UK Only +44 (0) 1527 830800
EMEA Website
Supreme Components International India, South East Asia +65 6848-1178
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
WPG +44 1628 958460
EMEA Website