Overview

The BTM410/BTM411 Bluetooth module from Laird 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-xx 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
Lead-free and RoHS compliant
FCC/IC & CE - Limited Modular Approval
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)
Max Transmit Power
Class 2, +4 dBm (from integrated antenna)
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 °C
Storage Temp - Min (°C)
-40 °C
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
Antenna Options BLE Services Bluetooth Version Chipset (Wireless) Compliance Connector Type Data Rate Development Kit Contents Dimension (Height - mm) Dimension (Length - mm) Dimension (Width - mm) Frequency Frequency Range (Max) Frequency Range (Min) Input Power Logical Interfaces Max Transmit Power Power Consumption Protocols Range Receive Sensitivity Software Weight Wi-Fi Coexistence Wireless Specification
BTM411 Integrated Antenna GAP v2.1 + EDR CSR BC04 FCC / IC / CE SMT 2.1 MBps Development board and software tools 3.4 mm 22 mm 12.5 mm 2.4 GHz 2.480 GHz 2.402 GHz 3.0 – 3.3V UART +4 dBm 32mA AT Command Set Up to 30 meters -84 dBm Terminal Software .105 oz (3 g) 2 wire and 3 wire schemes supported Bluetooth v2.1 + EDR
Antenna Options BLE Services Bluetooth Version Chipset (Wireless) Compliance Connector Type Data Rate Development Kit Contents Dimension (Height - mm) Dimension (Length - mm) Dimension (Width - mm) Frequency Frequency Range (Max) Frequency Range (Min) Input Power Logical Interfaces Max Transmit Power Power Consumption Protocols Range Receive Sensitivity Software Weight Wi-Fi Coexistence Wireless Specification
BTM411-03 Integrated Antenna GAP v2.1 + EDR CSR BC04 FCC / IC / CE SMT 2.1 MBps Development board and software tools 3.4 mm 22 mm 12.5 mm 2.4 GHz 2.480 GHz 2.402 GHz 3.0 – 3.3V UART +4 dBm 32mA AT Command Set Up to 30 meters -84 dBm Terminal Software .105 oz (3 g) 2 wire and 3 wire schemes supported Bluetooth v2.1 + EDR
Antenna Options BLE Services Bluetooth Version Chipset (Wireless) Compliance Connector Type Data Rate Development Kit Contents Dimension (Height - mm) Dimension (Length - mm) Dimension (Width - mm) Frequency Frequency Range (Max) Frequency Range (Min) Input Power Logical Interfaces Max Transmit Power Power Consumption Protocols Range Receive Sensitivity Software Weight Wi-Fi Coexistence Wireless Specification
BTM411-03-T/R Integrated Antenna GAP v2.1 + EDR CSR BC04 FCC / IC / CE SMT 2.1 MBps Development board and software tools 3.4 mm 22 mm 12.5 mm 2.4 GHz 2.480 GHz 2.402 GHz 3.0 – 3.3V UART +4 dBm 32mA AT Command Set Up to 30 meters -84 dBm Terminal Software .105 oz (3 g) 2 wire and 3 wire schemes supported Bluetooth v2.1 + EDR
Antenna Options BLE Services Bluetooth Version Chipset (Wireless) Connector Type Data Rate Frequency Frequency Range (Max) Frequency Range (Min) Logical Interfaces Max Transmit Power Protocols Range Receive Sensitivity Software Wi-Fi Coexistence Wireless Specification
DVK-BTM411 Integrated Antenna GAP v2.1 + EDR CSR BC04 USB Pluggable 2.1 MBps 2.4 GHz 2.480 GHz 2.402 GHz USB +4 dBm AT Command Set Up to 30 meters -84 dBm Terminal Software 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 01-17-19
Application Note - Absolute Current Ratings BTM41x.pdf All Application Note 01-17-19
Application Note - Bluetooth Latency and Data.pdf All Application Note 01-17-19
FCC 15C Test Report - BTM411.pdf All Certification 01-17-19
FCC 15C Test Report - BTM410.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
Japan Certificate - BTM431.pdf All Certification 01-17-19
Japan - STD-T66 Bluetooth - BTM41x.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
REACH Compliance - BTM411.pdf All Certification 01-17-19
RoHS Statement of Compliance - BTM411.pdf All Certification 01-17-19
RoHSII - EU WEEE Compliance BT RAMP v1 8 All Certification 07-12-19
User Guide - BTM41x Modules.pdf All Documentation 01-17-19
Quick Start Guide - BTM41x Development Kit.pdf All Documentation 01-17-19
Mini Dev Kit Comms - BTM41x BTM43x BTM44x v1.pdf All Documentation 01-17-19
Quick Start Guide - BTM411 Development Kit SPP.pdf All Documentation 01-17-19
Release Notes - BTM41x Firmware version 16.1.3.0.pdf All Documentation 01-17-19
PCN - BTM4x1 Label Change - 12 Aug 15.pdf All Documentation 01-17-19
EOL - Bluetooth - Nov-15-2015.pdf All Documentation 01-17-19
Product Brief - BTM41X Modules.pdf All Brochure 03-01-19
Datasheet (HIG) - BTM41x Modules.pdf All Datasheet 03-01-19
Deploy BTM41x V16.1.3.0.zip All Software 01-17-19
BTM41x.zip All Software 01-17-19
Bluetooth Development Kit Terminal Download.zip All Software 01-17-19
BTM41x Software Version 16.1.3.0.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

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.

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.