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
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)
Product Type Technology OS/Software System Architecture Chipset (Wireless) Antenna Type Logical Interfaces Frequency Range (Min) Frequency Range (Max) Bluetooth Version Connector Dimension (Height - mm) Dimension (Length - mm) Dimension (Width - mm) Input Power Max Transmit Power Power Consumption Protocols Receive Sensitivity Software Wi-Fi Coexistence Wireless Specification
BTM441 Embedded Module Bluetooth Classic, Bluetooth 2.1 + EDR AT Commands, Embedded Stack Hosted QCA (CSR) BC04 Internal Serial 2402 MHz 2480 MHz v2.1 + EDR SMT 3.4 mm 22 mm 12.5 mm 3.0 - 3.3V +4 dBm < 40mA AT Command Set -84 dBm Terminal Software 2 wire and 3 wire schemes supported Bluetooth v2.1 + EDR
Product Type Technology OS/Software System Architecture Chipset (Wireless) Antenna Type Logical Interfaces Frequency Range (Min) Frequency Range (Max) Bluetooth Version Connector Dimension (Height - mm) Dimension (Length - mm) Dimension (Width - mm) Input Power Max Transmit Power Power Consumption Protocols Receive Sensitivity Software Wi-Fi Coexistence Wireless Specification
BTM443 Embedded Module Bluetooth Classic, Bluetooth 2.1 + EDR AT Commands, Embedded Stack Hosted QCA (CSR) BC04 Internal Serial 2402 MHz 2480 MHz v2.1 + EDR SMT 3.4 mm 22 mm 12.5 mm 3.0 - 3.3V +4 dBm < 40mA Multipoint Mode -84 dBm Terminal Software 2 wire and 3 wire schemes supported Bluetooth v2.1 + EDR
Product Type Technology OS/Software System Architecture Chipset (Wireless) Antenna Type Logical Interfaces Frequency Range (Min) Frequency Range (Max) Bluetooth Version Connector Dimension (Height - mm) Dimension (Length - mm) Dimension (Width - mm) Input Power Max Transmit Power Power Consumption Protocols Receive Sensitivity Software Wi-Fi Coexistence Wireless Specification
DVK-BTM441 Development Kit Bluetooth Classic, Bluetooth 2.1 + EDR AT Commands Hosted QCA (CSR) BC04 Internal USB, Serial 2402 MHz 2480 MHz v2.1 + EDR USB Pluggable 3.4 mm 22 mm 12.5 mm 3.0 - 3.3V +4 dBm < 40mA AT Command Set -84 dBm Terminal Software 2 wire and 3 wire schemes supported Bluetooth v2.1 + EDR
Product Type Technology OS/Software System Architecture Chipset (Wireless) Antenna Type Logical Interfaces Frequency Range (Min) Frequency Range (Max) Bluetooth Version Connector Dimension (Height - mm) Dimension (Length - mm) Dimension (Width - mm) Input Power Max Transmit Power Power Consumption Protocols Receive Sensitivity Software Wi-Fi Coexistence Wireless Specification
DVK-BTM443 Development Kit Bluetooth Classic, Bluetooth 2.1 + EDR AT Commands Hosted QCA (CSR) BC04 Internal USB, Serial 2402 MHz 2480 MHz v2.1 + EDR USB Pluggable 3.4 mm 22 mm 12.5 mm 3.0 - 3.3V +4 dBm < 40mA Multipoint Mode -84 dBm Terminal Software 2 wire and 3 wire schemes supported Bluetooth v2.1 + EDR

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Documentation

Name Part Type Last Updated
Application Note - Bluetooth Latency and Data.pdf All Application Note 01/17/2019
EN 60950-1 - BTM440.pdf All Certification 01/17/2019
EN 301 489 - BTM440.pdf All Certification 01/17/2019
FCC 15C (SST) Grant - BTM4x1.pdf All Certification 01/17/2019
BTM400 Series DoC Sep2014.pdf All Certification 01/17/2019
CE - EN 60950-1 LVD Grant (BTM4x1).pdf.pdf All Certification 01/17/2019
CE - EN 62479 RF Exposure Test Report (BTM4x1).pdf All Certification 01/17/2019
CE - EN 301 489-1-17 WLAN Test Report (BTM4x1).pdf All Certification 01/17/2019
CE - EN 60950-1 LVD Test Report (BTM4x1).pdf All Certification 01/17/2019
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
EU Declaration of Conformity - BTM4xx - 2017.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
Draft EN 301 489-1-17 WLAN - BTM4xx.pdf All Certification 01/17/2019
EN 50385 and 62311 - RF Exposure - BTM4xx.pdf All Certification 01/17/2019
EN 300 328 V2.1.1 2.4G BT EDR - BTM4xx.pdf All Certification 02/04/2019
RoHSII - EU WEEE Compliance BT RAMP v1 8 All Certification 07/12/2019
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 01/17/2019
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 Brochure 03/04/2019
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
BTM44x v1 3 1 240 0 UartFirmwareUpgrade.zip All Software 01/17/2019
Application Note - Guidelines for Replacing Antennas v1.0 All Application Note 01/17/2019

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

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 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.