Laird BTM420 User manual

BTM420/421 DATA MODULE
USER MANUAL
VERSION 3.0
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www.lairdtech.com/wireless

BTM420/421
Bluetooth®Data Module
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/bluetooth
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Laird
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REVISION HISTORY
Revision
Date
Description
Approved By
1.0
22 June 2010
Initial Release
Jonathan Kaye
2.0
28 May 2012
Changes and Revisions
Jonathan Kaye
3.0
04 Jan 2013
Formatting, New Hardware Diagrams, FCC
Statement updates
Jonathan Kaye

BTM420/421
Bluetooth®Data Module
Embedded Wireless Solutions Support Center:
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www.lairdtech.com/bluetooth
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CONTENTS
Revision History............................................................................................................................................ 2
Overview and Key Features......................................................................................................................... 4
Features and Benefits ................................................................................................................................. 4
Application Areas ....................................................................................................................................... 4
Specifications ............................................................................................................................................... 5
Detailed Specifications ............................................................................................................................... 5
Pin Definitions ............................................................................................................................................ 7
Operating Parameters ................................................................................................................................ 8
Voltage Specifications ................................................................................................................................ 9
FCC Regulatory Statements....................................................................................................................... 10
BTM420 FCC and Industry Canada Statements ........................................................................................ 10
BTM421 FCC and Industry Canada Statements ........................................................................................ 11
EU Declaration of Conformity –BTM420 ................................................................................................. 12
EU Declaration of Conformity –BTM421 ................................................................................................. 13
Mechanical Drawings ................................................................................................................................ 14
BTM420 Mechanical Details ..................................................................................................................... 14
BTM420 Mechanical Details ..................................................................................................................... 15
BTM420 Mechanical Details ..................................................................................................................... 16
BTM421 Mechanical Details ..................................................................................................................... 17
BTM421 Mechanical Details ..................................................................................................................... 18
BTM421 Mechanical Details ..................................................................................................................... 19
BTM421 Mechanical Details ..................................................................................................................... 20
Ordering Information................................................................................................................................ 21
General Comments .................................................................................................................................... 21

BTM420/421
Bluetooth®Data Module
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/bluetooth
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OVERVIEW AND KEY FEATURES
The BTM420 and BTM421 Bluetooth modules from Laird Technologies have been designed to meet the
needs of developers who wish to add robust, short range Bluetooth data connectivity to their products and
who are using embedded Bluetooth stacks within 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 with EDR (Enhanced Data Rate). As well as
increasing data throughput up to 2.1 Mbps, this provides the important advantage of Secure Simple Pairing,
which improves security and enhances the ease of use for end customers.
With physical sizes as small as 12.5mm x 18.0mm and best of class, low power performance, these modules
are the ideal choice for applications where designers need both performance and minimum size. For
maximum flexibility in systems integration, the modules are designed to support separate power supplies for
I/O and the USB interface.
These modules present an HCI interface through a USB interface and are fully qualified as Bluetooth
Controller Subsystem Products. This allows designers to integrate them existing pre-approved Bluetooth Host
and Profile subsystem stacks to gain a Bluetooth END product approval for their product.
A low cost developer’s kit is available for prototyping. This ensures that the choice of Laird Technologies
Bluetooth modules guarantees the fastest route to market.
Features and Benefits
Bluetooth v2.1+EDR
Adaptive Frequency Hopping to cope with
interference from other wireless devices
Support for Secure Simple Pairing
External or internal antenna options
HCI Interface over USB
Bluetooth controller subsystem product
qualified
Compact size
Class 2 output –4dBm
Low power operation
USB interface
Multipoint Support
PCM & SCO for external codec
Wi-Fi coexistence hardware support
Application Areas
Embedded devices
Phone accessories
Security devices
Medical and wellness devices
Automotive applications
Bluetooth® advertising
ePOS

BTM420/421
Bluetooth®Data Module
Embedded Wireless Solutions Support Center:
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SPECIFICATIONS
Detailed Specifications
Table 1: Detailed Specifications
Categories
Feature
Implementation
Wireless Specification
Bluetooth®
Version 2.1+EDR
Transmit Class
Class 2
Frequency
2.402 –2.480 GHz
Channels
79 channels Frequency Hopping
Adaptive Frequency Hopping
Max Transmit Power
+4 dBm at antenna pad –BTM420
+4 dBmi (TBC) from integrated antenna –
BTM421
Receive Sensitivity
-84dBm
Range
30m
Data Transfer Rate
Up to 2.1 Mbps
Antenna Modes
External Antenna
50 Ohm matched SMT pad –BTM420
Integrated Antenna (option)
+0 dB multiplayer ceramic (TBC) –BTM421
USB Interface
Compliance
Version 1.1
Support
Version 2.0
Supply Voltage
3.1 V to 3.3 V
General Purpose
Interface
I/O
2 general purpose I.O pins for LEDs
Audio
Support
3 PCM Channels @ 64kbps
SCO Channels
Support SCO and eSCO
PCM Interface
Configurable as master or slave
8 bit A-law
8 bit µ-law
13 bit linear
PCM Clock available when in slave mode
Protocols and Firmware
Bluetooth Stack
V2.1 compliant
Connection Modes
Point to point (cable replacement)
Multipoint –max 7 slaves

BTM420/421
Bluetooth®Data Module
Embedded Wireless Solutions Support Center:
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Table 2: Detailed Specifications
Categories
Feature
Implementation
Current
Consumption
Data Transfer
Typically 32 mA
Low Power Sniff Mode
Less than 2.5 mA
Supply Voltage
Supply
3.0 V –3.3 V DC
Coexistence /
Compatibility
WLAN (802.11)
2-wire and 3-wire hardware coexistence schemes supported
Connections
Interface
Surface Mount Pads
External Antenna
Pad for 50 Ohm antenna –BTM420
Physical
Dimensions
12.5 mm x 18.0 mm x 3.4 mm –BTM420
12.5 mm x 24.0 mm x 3.4 mm –BTM421
Weight
3 grams
Environmental
Operating Temperature
-30°C to +70°C
Storage Temperature
-40°C to +85°C
Approvals
Bluetooth
Qualified as a Controller Subsystem Product
FCC
Limited Modular Approval –BTM420
Modular approval (Integrated Antenna option –BTM 421)
CE & R&TTE
Meets CE and R&TTE requirements
Miscellaneous
Lead free
Lead-free and RoHS compliant
Warranty
12 Months
Development
Tools
Development Kit
Development board

BTM420/421
Bluetooth®Data Module
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
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Pin Definitions
Table 3: Pin Definitions
Pin
Signal
Description
Voltage Specification
1
Unused
2
GND
3
Unused
4
Unused
5
Unused
6
Unused
7
GND
8
SPI_CSB
SPI bus chip select I/P
VIO
9
SPI_MISO
SPI bus serial O/P
VIO
10
SPI_MOSI
SPI bus serial I/P
VIO
11
SPI_CLK
SPI bus clock I/P
VIO
12
VDD_USB
USB & UART supply voltage
15
GND
16
PCM_IN
PCM clock I/P
VIO
17
PCM_SYNC
PCM sync I/P
VIO
18
PCM_CLK
PCM click I/P
VIO
19
PCM_OUT
PCM Data O/P
VIO
20
RESET
Module reset I/P
See note 2
21
Unused
22
GPIO2 / UART_DCD
I/O for host
VIO
23
GND
24
Unused
25
Unused
See note 3
26
Unused
See note 3
27
Unused
See note 3
28
GND
See note 3
29
ANT (BTM420)
Antenna connection (50 ohm matched)
See note 3
30
GND
See note 3
31
Unused
See note 3
32
Unused
See note 3
33
Unused
See note 3
34
Unused
See note 3
35
Unused
See note 3
36
Unused
See note 3
37
Unused
See note 3
38
Unused
39
Unused
40
Unused

BTM420/421
Bluetooth®Data Module
Embedded Wireless Solutions Support Center:
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Pin
Signal
Description
Voltage Specification
41
GNd
42
GPIO1 / UART_RI
I/O for hose
VIO
43
Unused
44
Unused
45
GND
46
D-
USB D-
VUSB
47
D+
USB D+
VUSB
48
Unused
49
Unused
50
Unused
1. Unused pins may have internal connections and must not be connected.
2. Reset input is active low. Input is pulled up to VDD_IN via 22k. Minimum reset pulse width is 5 ms.
3. Pins 25-37 should be left not connected on modules with integrated antennae (BTM411, BTM421 and
BTM431)
Operating Parameters
Table 4: Recommended Operating Conditions
Recommended Operating Conditions
OPERATING CONDITION
MIN
MAX
VDD_USB (USB compatibility not required)
1.7
3.6
VDD_USB (USB compatibility required)
3.1
3.6
VDD_IO
1.7
3.3
VDD_IN
3.0
3.3

BTM420/421
Bluetooth®Data Module
Embedded Wireless Solutions Support Center:
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Voltage Specifications
Table 5: Logic Levels (VUSB)
Logic Levels (VUSB)
INPUT VOLTAGE LEVELS
MIN
TYP
MAX
Vih
0.7VDD_USB
Vil 2.7 <VDD_USB<3.0
-0.4
+0.8
1.7<VDD_USB<1.9
-0.4
+0.4
Output Voltage Levels (1.7 <VDD_USB_1.9)
Voh (lout = -4mA)
VDD_USB –0.4
Vol (lout = 4mA)
Output Voltage Levels (2.7<VDD_USB<3.0)
Voh (lout = -4mA)
VDD_USB –2.0
Vol (lout = 4mA)
0.2
Note: VDD_USB must be connected to power the USB and UART interfaces.
Table 6: Logic Levels (VIO)
Logic Levels (VIO)
INPUT VOLTAGE LEVELS
MIN
TYP
MAX
Vih
0.7VDD_IO
Vil 2.7 <VDD_IO<3.0
-0.4
+0.8
1.7<VDD_IO<1.9
-0.4
+0.4
Output Voltage Levels (1.7 < VDD_IO < 1.9)
Voh (lout = -4mA)
VDD_IO –0.4
Vol (lout = 4mA)
0.4
Output Voltage Levels (2.7 < VDd_IO < 3.0)
Voh (lout = -4mA)
VDD_IO –0.2
Vol (lout = 4mA)
0.2

BTM420/421
Bluetooth®Data Module
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/bluetooth
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Laird
Americas: [phone]
Europe: [phone]
Hong Kong: [phone]
FCC REGULATORY STATEMENTS
BTM420 FCC and Industry Canada Statements
The Final Equipment user manual must show the following statements:
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1)
This device may not cause harmful interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
Changes or modifications not expressly approved by the party responsible for compliance could void the
user’s authority to operate the equipment.
To comply with the FCC RF exposure compliance requirements, this device and its antenna must not be co-
located or operating to conjunction with any other antenna or transmitter.
Considerations for OEM integration:
This module has a limited modular approval. Approval with any other antenna configuration or layout other
than that approved will necessitate additional radiated emission testing to be performed.
To inherit the modular approval, the antennas for this transmitter must be installed to provide a separation
distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any
other antenna or transmitter.
This module was approved with the following antenna:
RF Solutions: ANT-24G-WHJ-SMA 0 dBi
Operation of this module with any other antenna will require additional testing to be performed.
Co-location with other radio transmitting devices operating concurrently in the same band will require
additional testing and certification.
Designers should note the distinction that the FCC makes regarding portable and mobile devices. Mobile
devices are defined as products that are not used closer than 20 cm to the human body, whereas portable
devices can be used closer than 20 cm to the body. A device may be used in portable exposure conditions
with no restrictions on host platforms when the averaged output power is less than the low power threshold
for an uncontrolled environment ≤60/f(GHz) i.e. 25 mW for a 2.4 Ghz device. The Maximum Power Exposure
for the BTM420 has been evaluated and found to comply with the low power threshold for an uncontrolled
environment.
Refer to FCC document KDB 447498 for more information on RF exposure procedures and equipment
authorization policies for mobile and portable devices.
FCC Labelling requirement
If the FCC ID is not visible when the module is installed inside another device, then the outside of the device
into which the module is installed must also display a label referring to the enclosed module. This exterior
label can use wording such as the following: “Contains Transmitter Module FCC ID: PI4420B” or “Contains
FCC ID: PI4420B.” Any similar wording that expresses the same meaning may be used.

BTM420/421
Bluetooth®Data Module
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/bluetooth
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Laird
Americas: [phone]
Europe: [phone]
Hong Kong: [phone]
BTM421 FCC and Industry Canada Statements
The user manual must show the following statements:
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1)
This device may not cause harmful interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
Changes or modifications not expressly approved by the party responsible for compliance could void the
user’s authority to operate the equipment.
To comply with the FCC RF exposure compliance requirements, this device and its antenna must not be co-
located or operating to conjunction with any other antenna or transmitter.
Considerations for OEM integration:
To inherit the modular approval, the antennas for this transmitter must be installed to provide a separation
distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any
other antenna or transmitter.
Co-location with other radio transmitting devices operating concurrently in the same band will require
additional testing and certification.
Designers should note the distinction that the FCC makes regarding portable and mobile devices. Mobile
devices are defined as products that are not used closer than 20 cm to the human body, whereas portable
devices can be used closer than 20 cm to the body. A device may be used in portable exposure conditions
with no restrictions on host platforms when the averaged output power is less than the low power threshold
for an uncontrolled environment ≤60/f(GHz) i.e. 25 mW for a 2.4 Ghz device. The Maximum Power Exposure
for the BTM421 has been evaluated and found to comply with the low power threshold for an uncontrolled
environment.
Refer to FCC document KDB 447498 for more information on RF exposure procedures and equipment
authorization policies for mobile and portable devices.
FCC Labelling requirement
If the FCC ID is not visible when the module is installed inside another device, then the outside of the device
into which the module is installed must also display a label referring to the enclosed module. This exterior
label can use wording such as the following: “Contains Transmitter Module FCC ID: PI4421B” or “Contains
FCC ID: PI4421B.” Any similar wording that expresses the same meaning may be used.

BTM420/421
Bluetooth®Data Module
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/bluetooth
12
Laird
Americas: [phone]
Europe: [phone]
Hong Kong: [phone]
EU DECLARATION OF CONFORMITY –BTM420
Manufacturer:
Laird Technologies
Product:
BTM420
EU Directive:
RTTE 1995/5/EC
Conformity Assessment:
Annex IV
Reference standards used for presumption of conformity:
Article Number:
Requirement:
Reference standard(s):
3.1a
Health and Safety
EN 60950-1:2006
3.1b
Protection requirements with
respect to electromagnetic
compatibility
EN 301 489-1 V1.8.1
EN 301 489-17 V2.1.1
Emissions:
EN55022:2006/A1:2000/A2:2006 (ClassB)
Immunity:
EN61000-4-2:1995/A1:1998/A2:2001
EN61000-4-3:2002/A1:2002
3.2
Means of the efficient use of the
radio frequency spectrum
EN 300 328 V1.7.1 (2006-10)
Declaration:
We, Laird Technologies, declare under our sole responsibility that the essential radio test suites have been
carried out and that the above product to which this declaration relates is in conformity with all the
applicable essential requirements of Article 3 of the EU Directive 1995/5/EC, when used for its intended
purpose.
Place of Issue:
Laird Technologies
Saturn House, Mercury Park
Wooburn Green
HP100HH,
United Kingdom
tel: [phone]
fax: [phone]
Date of Issue:
October 2009
Name of Authorised Person:
Tim Wheatley, Director of Engineering
Signature:

BTM420/421
Bluetooth®Data Module
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/bluetooth
13
Laird
Americas: [phone]
Europe: [phone]
Hong Kong: [phone]
EU DECLARATION OF CONFORMITY –BTM421
Manufacturer:
Laird Technologies
Product:
BTM421
EU Directive:
RTTE 1995/5/EC
Conformity Assessment:
Annex IV
Reference standards used for presumption of conformity:
Article Number:
Requirement:
Reference standard(s):
3.1a
Health and Safety
EN 60950-1:2006
3.1b
Protection requirements with
respect to electromagnetic
compatibility
EN 301 489-1 V1.8.1
EN 301 489-17 V2.1.1
Emissions:
EN55022:2006/A1:2000/A2:2006(ClassB)
Immunity:
EN61000-4-2:1995/A1:1998/A2:2001
EN61000-4-3:2002/A1:2002
3.2
Means of the efficient use of the
radio frequency spectrum
EN 300 328 V1.7.1 (2006-10)
Declaration:
We, Laird Technologies, declare under our sole responsibility that the essential radio test suites have been
carried out and that the above product to which this declaration relates is in conformity with all the
applicable essential requirements of Article 3 of the EU Directive 1995/5/EC, when used for its intended
purpose.
Place of Issue:
Laird Technologies
Saturn House, Mercury Park
Wooburn Green
HP100HH,
United Kingdom
tel: [phone]
fax: [phone]
Date of Issue:
October 2009
Name of Authorised Person:
Tim Wheatley, Director of Engineering
Signature:

BTM420/421
Bluetooth®Data Module
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/bluetooth
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Laird
Americas: [phone]
Europe: [phone]
Hong Kong: [phone]
MECHANICAL DRAWINGS
BTM420 Mechanical Details
Note: An area of 1.5 mm around the module should be reserved as a keep-out area.

BTM420/421
Bluetooth®Data Module
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/bluetooth
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Laird
Americas: [phone]
Europe: [phone]
Hong Kong: [phone]
BTM420 Mechanical Details
Note: An area of 1.5 mm around the module should be reserved as a keep-out area.

BTM420/421
Bluetooth®Data Module
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/bluetooth
16
Laird
Americas: [phone]
Europe: [phone]
Hong Kong: [phone]
BTM420 Mechanical Details
WARNING: Test point dimensions are for reference only. DO NOT make electrical connections to these test
points, this will void the warranty. Laird does not recommend routing on the top layer
underneath the module.

BTM420/421
Bluetooth®Data Module
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/bluetooth
17
Laird
Americas: [phone]
Europe: [phone]
Hong Kong: [phone]
BTM421 Mechanical Details
Note: An area of 1.5 mm around the module should be reserved as a keep-out area.

BTM420/421
Bluetooth®Data Module
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/bluetooth
18
Laird
Americas: [phone]
Europe: [phone]
Hong Kong: [phone]
BTM421 Mechanical Details
Note: An area of 1.5 mm around the module should be reserved as a keep-out area.

BTM420/421
Bluetooth®Data Module
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/bluetooth
19
Laird
Americas: [phone]
Europe: [phone]
Hong Kong: [phone]
BTM421 Mechanical Details
Note: An area of 1.5 mm around the module should be reserved as a keep-out area.

BTM420/421
Bluetooth®Data Module
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/bluetooth
20
Laird
Americas: [phone]
Europe: [phone]
Hong Kong: [phone]
BTM421 Mechanical Details
WARNING: Test point dimensions are for reference only. DO NOT make electrical connections to these test
points, this will void the warranty. Laird does not recommend routing on the top layer
underneath the module.
The Development Kit Schematics for this product can be accessed from the following link:
Development Kit Schematics –BTM420 / BTM421