Laird BTM511 User manual

Brand: Laird

Model: BTM511

Category: Bluetooth music receivers

Type: User manual

This manual is also suitable for

PI4510B

BTM510/511

MULTIMEDIA MODULE

USER MANUAL

Innovative Technology

for a Connected World

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Laird Technologies

BTM510/511

Bluetooth® Multimedia Module

CONTENTS

BTM510/511 Bluetooth® Module ..3

Overview .............................................. 3

BTM510/511 Key Features ................... 3

Specications ................................4

Detailed Specications ......................... 4

Pin Denitions ...................................... 6

Operating Parameters ...................8

Voltage Specications .......................... 8

Notes for PCB Layout ........................... 8

Conguring the BTM510/511 ........9

References ........................................... 9

Glossary of Terms ............................... 10

AT Command Set .............................. 11

Assumptions ...................................... 11

Commands ........................................ 11

General AT Commands ..................... 11

General Bluetooth® Control ............... 22

Hardware Unit Control ....................... 28

Bluetooth® Proles ............................. 30

Secure Simple Pairing ......................... 37

Link Key Management ....................... 37

Miscellaneous...................................... 38

Appendix ........................................... 39

BT-MM Unsolicited Messages ............ 39

BT-MM Error Responses ..................... 39

Mechanical Drawings ..................41

Mechanical Details ............................. 41

Recommended PCB Footprint ............ 41

Diagrams ............................................ 42

Ordering Information ..................45

Product Part Numbers ........................ 45

General Comments ............................ 45

TABLE OF

CONTENTS

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Laird Technologies

BTM510/511

Bluetooth® Multimedia Module

The BTM510 and BTM511 are low-power Bluetooth® modules designed for adding robust

audio and voice capabilities. Based on the market-leading Cambridge Silicon Radio BC05

chipset, these modules provide exceptionally low power consumption with outstanding range.

Supporting the latest Bluetooth® Version 2.1+EDR speci cation, these modules provide the

important advantage of secure simple pairing that improves security and enhances easy use.

At only 14mm x 20mm, the compact size of the BTM510 makes it ideal for battery-powered

or headset form factor audio and voice devices. With a 16-bit stereo codec and microphone

inputs to support both stereo and mono applications, these modules also contain a full,

integrated Bluetooth®-quali ed stack along with SPP, HFP 1.5, HSP, AVRCP, and A2DP

pro les. Customers using these modules may list and promote their products free of charge

on the Bluetooth® website.

The BTM510/511 modules include an embedded 32-bit, 64-MIPS DSP core within the BC05.

This is integrated with the Bluetooth® functionality which allows designers to add signi cant

product enhancements including features such as echo cancellation, noise reduction, and

audio enhancement using additional soft codecs. The availability of the 16MB of  ash memory

in the module allows complex functionality to be included. DSP routines can be licensed

through a number of specialist partners. Typical applications for these modules include

Bluetooth® stereo headsets, VoIP phones, and wireless audio links.

To speed product development and integration, Laird Technologies has developed a

comprehensive AT command interface that simpli es application development, including

support for audio and headset functionality. Access to GPIO pins allows mapping for direct

connection to actuator buttons on headsets. Combined with a low-cost development kit,

Laird Technologies’ Bluetooth® modules provide faster time to market.

FEATURES

• Fully featured Bluetooth® multimedia module

• Bluetooth® v2.1+EDR

• Supports mono and stereo

headset applications

• Adaptive Frequency Hopping to cope with

interference from other wireless devices

• 32bit Kalimba DSP for enhanced

audio applications

• Support for Secure Simple Pairing

• External or internal antenna options

• HSP, HFP, A2DP, and AVRCP audio pro les

• 16-bit stereo codec and microphone input

• Integrated audio ampli ers for driving

stereo speaker

• Comprehensive AT interface for

simple programming

• Bluetooth® END product quali ed

• Compact size

• Class 2 output – 4dBm

• Low power operation

• Wi-Fi co-existence hardware support

APPLICATION AREAS

• High-quality stereo headsets

• Mono voice headsets

• Hands-free devices

• Wireless audio cable replacement

• MP3 and music players

• Phone accessories

• VoIP products

• Cordless headsets

• Automotive

OVERVIEW AND

KEY FEATURES

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BTM510/511

Bluetooth® Multimedia Module

CATEGORIES FEATURE IMPLEMENTATION

Wireless Specication Standards Supported Bluetooth® v2.1 + EDR

Transmit Class Class 2

Frequency 2.402 – 2.480 GHz

Channels 79 channels Frequency Hopping Adaptive Frequency Hopping

Max Transmit Power +4 dBm @ antenna pad – BTM510

+4 dBmi from integrated antenna – BTM511 (provisional)

Min Transmit Power -27 dBm @ antenna pad – BTM510

-27 dBmi from integrated antenna – BTM511 (provisional)

Receive Sensitivity Better than -86 dBm

Data Transfer rate Up to 300kbps

Range Up to 50 meters free space (Data)

Antenna Modes External Antenna 50 Ohm matched SMT pad – BTM510

Integrated Antenna +0dB (provisional) multilayer ceramic – BTM511

UART Interface Serial Interface RS-232 bi-directional for commands and data 16550 compat-

ible

Baud Rate Congurable from 1,200 to 921,600bps

Non-standard baud rates supported

Bits 8

Parity Odd, even, none

Stop bits 1 or 2

Default Serial parameters 9,600,n,8,1

Levels Set by VDD_USB pin

Modem Control DTR, DSR, DCD, RI, RTS, CTS

General Purpose Interface I/O 8 general purpose I/O pins

I2S Stereo Audio Digital Interface Bus

LED Two

Audio Codec Integrated stereo codec with -95dB SNR for DAC

Ampliers Direct drive for 22Ω Mono Speaker / 44Ω Stereo Speakers

Microphone Input with bias for low noise microphone

Sample Rates (DAC & ADC) 8, 11.025, 16, 22.05, 32 & 44.1kHz

Protocols & Firmware Bluetooth® Stack V2.1 compliant. Fully integrated.

Proles GAP (Generic Access Prole)

SDP (Service Discovery Prole)

SPP (Serial Port Prole)

HSP

HFP – Audio Gateway and Handsfree

A2DP – Source and Sink

AVRCP – Target and Controller

Protocols RFCOMM

AVCTP

AVDTP

Firmware Upgrade Available over UART

SPECIFICATIONS

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Laird Technologies

BTM510/511

Bluetooth® Multimedia Module

CATEGORIES FEATURE IMPLEMENTATION

Command Interface AT Instruction set Comprehensive control of connection and module operation,

including extensions for Audio control.

Direct mapping of GPIO to audio functions, e.g. Play, Volume,

etc.

S Registers for non-volatile storage of parameters

DSP Kalimba DSP Integrated in BC05 32bit, 64MIPS, 16Mbps Flash Memory

(shared)

Applications Available from partners

Current Consumption Data Transfer Typically < 35mA

Stereo Music Typically < 70mA (including speaker drive)

Low Power Sniff Mode Less than 1.5mA

Supply Voltage Supply 3.0V – 3.6V DC

I/O 1.7V – 3.6V DC

USB 1.7V – 3.6V DC

Coexistence / Compatibility WLAN (802.11) 2-wire and 3-wire hardware coexistence schemes supported

Connections External Antenna (option) Pad for 50 Ohm antenna – BTM510

Interface Surface Mount Pads

Physical Dimensions 14.0mm x 20.0 x 1.6mm - BTM510

14.0mm x 26.0mm x 1.6mm - BTM511 (provisional)

Weight 3 grams

Environmental Operating Temperature -30°C to +70°C

Storage Temperature -40°C to +85°C

Approvals Bluetooth®Qualied as an END product

FCC Meets FCC requirements

Modular Approval (Integrated Antenna option – BTM511)

CE & R&TTE Meets CE and R&TTE requirements

Miscellaneous Lead free Lead-free within EU requirements and RoHS compliant

Warranty 12 Months

Development Tools Development Kit Development board and software tools

SPECIFICATIONS

CATEGORIES FEATURE IMPLEMENTATION

Wireless Specication Standards Supported Bluetooth® v2.1 + EDR

Transmit Class Class 2

Frequency 2.402 – 2.480 GHz

Channels 79 channels Frequency Hopping Adaptive Frequency Hopping

Max Transmit Power +4 dBm @ antenna pad – BTM510

+4 dBmi from integrated antenna – BTM511 (provisional)

Min Transmit Power -27 dBm @ antenna pad – BTM510

-27 dBmi from integrated antenna – BTM511 (provisional)

Receive Sensitivity Better than -86 dBm

Data Transfer rate Up to 300kbps

Range Up to 50 meters free space (Data)

Antenna Modes External Antenna 50 Ohm matched SMT pad – BTM510

Integrated Antenna +0dB (provisional) multilayer ceramic – BTM511

UART Interface Serial Interface RS-232 bi-directional for commands and data 16550 compat-

ible

Baud Rate Congurable from 1,200 to 921,600bps

Non-standard baud rates supported

Bits 8

Parity Odd, even, none

Stop bits 1 or 2

Default Serial parameters 9,600,n,8,1

Levels Set by VDD_USB pin

Modem Control DTR, DSR, DCD, RI, RTS, CTS

General Purpose Interface I/O 8 general purpose I/O pins

I2S Stereo Audio Digital Interface Bus

LED Two

Audio Codec Integrated stereo codec with -95dB SNR for DAC

Ampliers Direct drive for 22Ω Mono Speaker / 44Ω Stereo Speakers

Microphone Input with bias for low noise microphone

Sample Rates (DAC & ADC) 8, 11.025, 16, 22.05, 32 & 44.1kHz

Protocols & Firmware Bluetooth® Stack V2.1 compliant. Fully integrated.

Proles GAP (Generic Access Prole)

SDP (Service Discovery Prole)

SPP (Serial Port Prole)

HSP

HFP – Audio Gateway and Handsfree

A2DP – Source and Sink

AVRCP – Target and Controller

Protocols RFCOMM

AVCTP

AVDTP

Firmware Upgrade Available over UART

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BTM510/511

Bluetooth® Multimedia Module

PIN SIGNAL DESCRIPTION VOLTAGE

SPECIFICATION

1 PIO15 / DTR Host I/O VIO

2 PIO5/BT_STATE/BT_PRIORITY Host I/O, BT Co-existence VIO

3 PCM_IN PCM Data I/P VIO

4 PCM_OUT PCM Data O/P VIO

5 PCM_SYNC PCM Sync I/P VIO

6 PCM_CLK PCM CLK I/P VIO

7 LED_EXT1 Host I/O See Note 2

8 LED_EXT0 Host I/O See Note 2

9 GND

10 VDD_USB USB supply voltage

11 VDD_IO I/O supply voltage

12 VDD_IN Main supply voltage

13 GND

14 SPI_CSB SPI bus chip select I/P VIO

15 SPI_MISO SPI bus serial O/P VIO

16 SPI_CLK SPI bus clock I/P VIO

17 SPI_MOSI SPI bus serial I/P VIO

18 PIO2/DSR Host I/O VIO

19 PIO3/RI Host I/O VIO

20 PIO1/DCD Host I/O VIO

21 PIO0/BT_ACTIVE Host I/O, BT Co-existence VIO

22 GND

23 AUDIO_GND Audio ground

24 SPKR_A_N Speaker, channel A- (left) See note 3

25 SPKR_A_P Speaker, channel A+ (left) See note 3

26 SPKR_B_N Speaker, channel B- (right) See note 3

27 SPKR_B_P Speaker, channel B+ (right) See note 3

28 MIC_BIAS Microphone bias See note 4

29 MIC_BP_C Microphone, channel A- (left) See note 4

30 MIC_BN_C Microphone, channel A+ (left) See note 4

31 MIC_AP_C Microphone, channel B- (right) See note 4

32 MIC_AN_C Microphone, channel B+ (right) See note 4

33 Unused

34 ANT Antenna connection – BTM510 (50 ohm matched)

35 Unused

36 Unused

37 Unused

38 Unused

39 Unused

40 Unused

41 Unused

42 Unused

43 Unused

44 Unused

45 USB_D- VUSB

46 USB_D+ VUSB

47 GND

48 UART_RTS Request to Send O/P VUSB

49 UART_CTS Clear to Send I/P VUSB

50 UART_TX Transmit data O/P VUSB

51 UART_RX Receive data I/P VUSB

52 PIO7/RF_ACTIVE Host I/O, BT Co-existence VIO

53 PIO6/WLAN_ACTIVE Host I/O, BT Co-existence VIO

54 Reset Module reset I/P See Note 1

SPECIFICATIONS

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BTM510/511

Bluetooth® Multimedia Module

SPECIFICATIONS

The voltage on the module pad should be maintained below 0.5V

in which case the Ron of the FET is around 20Ω. Provided that this

condition is met, then the current owing through the diode is:

3. The speaker output is capable of driving loads with a minimum

impedance of 16Ω directly.

4. The audio inputs can operate in either line input mode or microphone

mode. The input circuit has a two stage amplier – the rst stage

provides a xed 24dB gain and the second a variable gain of

between -3dB and 18dB. If an input gain of less than 24dB is selected,

then the rst stage is switched out and the module is operating in line

input mode.

Iled =VDD - VFWhere VF is the forward bias voltage of the LED.

R + 20

When operating in microphone mode the

microphone should be biased as follows:

MIC_AP

MIC_AN

Module

External Circuit

MIC_BIAS

15 nH

15 pF

15 nH

15 pF

The input impedance on the microphone inputs (in microphone mode) is typically 6kΩ. In order to

maintain the regulation on the MIC_BIAS pin, the current drawn must be in the range 0.2 – 1.23mA.

If the microphone draws less current than this then an additional resistor to ground must be added to

pre-load the microphone output. The audio input is designed for use with inputs of between 1μA

and 10μA at 94dB SPL. If the biasing resistors are set to 1kΩ this implies a microphone with a

sensitivity in the range -40dBV to -60dBV.

The low pass lter elements formed by the inductor and capacitor are required to eliminate RF pick

up on the microphone inputs and should be placed as close to the module as possible.

When operating in line input mode, the input can be connected directly to the module input pins

in either single or double ended conguration as follows:

AC AC

Single ended Double ended

Note: 1. Reset input is active low. Input is pulled up to VDD_IN via 22k.

Minimum reset pulse width is 5ms.

2. LED drive pins are open drain outputs and hence the external circuit

to the right should be used.

VDD

Module External Circuit

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Bluetooth® Multimedia Module

NOTES FOR PCB LAYOUT:

1. The RF output pin must be matched to a 50Ω strip-line or coplanar waveguide on the antenna-less version (BTM510).

2. Ensure that there are no exposed conductors under the module to avoid shorts to the test points on the module underside.

3.  ThePCBfootprintisprovidedforguidanceonly.UsersmaywishtomodifythePCBlanddimensionstosuittheirspecic

manufacturing or process.

OPERATING PARAMETERS

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 3.6

VOLTAGE SPECIFICATIONS

LOGIC LEVELS (VUSB)

Input Voltage Levels Min Typ Max

Vih 0.625VDD_USB VDD_USB+0.3

Vil -0.3 0.25VDD_USB

Output Voltage Levels

Voh (Iout = -4mA) 0.75VDD_USB VDD_USB

Vol (Iout = 4mA) 0 0.125

LOGIC LEVELS (VIO)

Input Voltage Levels Min Typ Max

Vih 0.625VDD_IO VDD_IO+0.3

Vil -0.3 0.25VDD_IO

Output Voltage Levels

Voh (Iout = -4mA) 0.75VDD_IO VDD_IO

Vol (Iout = 4mA) 0 0.125

LOGIC LEVELS (VUSB – USB TERMINALS D+, D-)

Input Voltage Levels Min Typ Max

Vih 0.7VDD_USB

Vil 0.3VDD_USB

Output Voltage Levels (to correctly terminated USB cable)

Voh 2.8 VDD_USB

Vol 0 0.2

OPERATING

PARAMETERS

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BTM510/511

Bluetooth® Multimedia Module

CONFIGURING

THE BTM510/511

INTRODUCTION

This document describes the protocol used to control and congure the BT-MM Bluetooth device.

The AT commands described in the document apply to rmware releases from V14.0.9 onwards.

The protocol is similar to the industry standard Hayes AT protocol used in telephony modems which is

appropriate for cable replacement scenarios, as both types of devices are connection oriented.

Just like telephony modems, Laird Technologies’ devices powers up in an unconnected state and will only respond

via the serial interface. In this state the device will not even respond to Bluetooth Inquiries. Then, just like controlling

a modem, the host can issue AT commands which map to various Bluetooth activities. Conguration can be saved,

so that on a subsequent power up the device is discoverable or automatically connects.

The device has a serial interface and an RF communications end point. The latter has a concept of connected

and unconnected modes and the former will have a concept of command and data modes. This leads to the

matrix of states shown below.

RF UNCONNECTED RF CONNECTED

Local Command Mode OK OK

Remote Command Mode ILLEGAL OK

Data Mode ILLEGAL OK

The combinations, ‘Data and RF Unconnected Mode’ and ‘Remote Command and RF Unconnected Mode’ do

not make sense and will be ignored.

Navigation between these states is done using the AT commands which are described in detail in subsequent

sections.

REFERENCES

[1] “AT Command Set”

[2] “BlueLab_v4.0_Release_Note.pdf”

[3] “Audio/Video Distribution Transport Protocol Specication” Rev.V12, 16/04/2007

[4] “Advanced Audio Distribution Prole Specication” Rev. V12, 16/04/2007

[5] “Audio/Video Remote Control Prole” Revision V14r00, 26/06/2008

[6] “Software Release Note Stereo Headset SDK Q3 2007 RC3.1” CS-117522-RNP1, CSR

[7] “Stereo Headset SDK Q3 2007 User Guide” CSR, CS-116451-UGP1, CSR, December2007

[8] “Bluetooth Specication Version 2.1 + EDR [vol3]”, 26 July 2007

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BTM510/511

Bluetooth® Multimedia Module

CONFIGURING

THE BTM510/511

Glossary of Terms

DESCRIPTION

A2DP : Advanced Audio Distribution Prole

ADC :Analogue to Digital Converter

AGHFP : Audio Gateway Hands-Free Prole

AT : Command prex, ‘Attention’

AVRCP : Audio/Video Remote Control Prole

BISM :Bluetooth Intelligent Serial Module

Codec :Device capable of encoding / decoding an analogue / digital signal

DAC :Digital to Analogue Converter

DSP :Digital Signal Processor

DUN : Dial-Up Network Prole

FTP : File Transfer Prole

GOEP : Generic Object Access Exchange Prole

GPIO :General Purpose Input Output

HFP : Hands Free Prole

HID : Human Interface Device Prole

I/O (IO) : Input/Output

Mic :Microphone

OPP : Object Push Prole

PBAP : Phone Book Access Prole

PWM :Pulse Width Modulation

Sxxx :S-Register No. xxx

SBC : Sub Band Codec

SPP : Serial Port Prole

TBD :To Be Determined

UART :Universal Asynchronous Receiver / Transmitter

PT :PASSS THROUGH Command

UI :UNIT INFO Command

SUI :SUBUNIT INFO Command

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Bluetooth® Multimedia Module

CONFIGURING

THE BTM510/511

AT Command Set

Assumptions

1. All commands are terminated by the carriage return character 0x0D, which is represented by the string

<cr> in descriptions below this cannot be changed.

2. All responses from the device have carriage return and linefeed characters preceding

and appending the response. These dual character sequences have the values 0x0D and 0x0A

respectively and shall be represented by the string <cr,lf>.

3. All Bluetooth addresses are represented by a xed 12 digit hexadecimal string, case insensitive.

4. All Bluetooth Device Class codes are represented by a xed 6 digit hexadecimal string, case insensitive.

Commands

The following syntax is employed throughput this document to describe optional or mandatory parameters for

AT commands.

<bd_addr> A 12 character Bluetooth address consisting of ASCII characters ‘0’ to ‘9’, ‘A’ to ‘F’ and ‘a’ to ‘f’.

<devclass> A 6 character Bluetooth device class consisting of ASCII characters ‘0’ to ‘9’, ‘A’ to ‘F’ and ‘a’ to ‘f’.

N A positive integer value.

M An integer value which could be positive or negative, which can be entered as a decimal value or

in hexadecimal if preceded by the ‘$’ character. E.g. the value 1234 can also be entered as $4D2

<string> A string delimited by double quotes. E.g. “Hello World”. The “ character MUST be supplied as delimiters.

<uuid> A 4 character UUID number consisting of ASCII characters ‘0’ to ‘9’, ‘A’ to ‘F’ and ‘a’ to ‘f’.

General AT Commands

1. AT

Used to check the module is available.

Response: <cr,lf>OK<cr,lf>

2. ATA {Answer Call}

Accept an incoming connection, which is indicated by the unsolicited string

<cr,lf>RING 123456789012<cr,lf> every second. 123456789012 is the Bluetooth address of

the connecting device.

Response: <cr,lf>CONNECT 123456789012<cr,lf>

3. ATD<bd_addr>,<uuid> {Make Outgoing Connection}

Make a connection to device with Bluetooth address <bd_addr> and SPP prole <uuid>.

The <uuid> is an optional parameter which species the UUID of the prole server to attach to,

and if not supplied then the default UUID from S Register 101 is used. As this is a device

which utilises the RFCOMM layer as described in the Bluetooth specication, it necessarily implies

that only proles based on RFCOMM can be accessed.

The timeout is specied by S register 505.

Response: <cr,lf>CONNECT 123456789012<cr,lf>

Or <cr,lf>NO CARRIER<cr,lf>

Due to a known issue in the Bluetooth RFCOMM stack, it is not possible to make more than

65525 outgoing connections in a single power up session. Therefore if that number is exceeded,

then the connection attempt will fail with the following response:-

Response: <cr,lf>CALL LIMIT

Or <cr,lf>NO CARRIER<cr,lf>

In that case, issuing an ATZ to reset the device will reset the count to 0 and more connections

are possible.

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BTM510/511

Bluetooth® Multimedia Module

CONFIGURING

THE BTM510/511

The following RFCOMM based UUIDs are dened in the Bluetooth Specication:-

4. ATDL {Remake Connection}

Make a connection with the same device and service as that specied in the most recent ATD

command. An error will be returned if the ‘L’ modier is specied AND a Bluetooth address.

If both ‘L’ and ‘R’ modiers are specied then an error will be returned.

Response: <cr,lf>CONNECT 123456789012 AE<cr,lf>

Or <cr,lf>NO CARRIER<cr,lf>

5.ATDR{MakeConnectiontopeerspeciedinAT+BTR}

Make a SPP connection with the device address specied in the most recent AT+BTR command.

The service is as specied in S Register 101. An error will be returned if the ‘R’ modier is specied

AND a Bluetooth address.

If both ‘R’ and ‘L’ modiers are specied then an error will be returned.

Response: <cr,lf>CONNECT 123456789012 AE<cr,lf>

Or <cr,lf>NO CARRIER<cr,lf>

6. ATEn {Enable/Disable Echo}

This command enables or disables the echo of characters to the screen. A valid parameter value

will be written to S Register 506.

All other values of n will generate an error.

Response: <cr,lf>OK<cr,lf>

Response: <cr,lf>ERROR nn<cr,lf>

7. ATH {Drop Connection}

Drop an existing connection or reject an incoming connection indicated by unsolicited RING messages.

Response: <cr,lf>NO CARRIER<cr,lf>

PROFILE NAME UUID

Serial Port 0x1101

LAN Access Using PPP 0x1102

Dialup Networking 0x1103

IrMC Sync 0x1104

OBEX Object Push 0x1105

OBEX File Transfer 0x1106

IrMC Sync Command 0x1107

Headset 0x1108

Cordless Telephony 0x1109

E0 Disable echo.

E1 Enable echo.

PROFILE NAME UUID

Intercom 0x1110

Fax 0x1111

Audio Gateway (HSP) 0x1112

WAP 0x1113

WAP_CLIENT 0x1114

Advanced Audio

Distribution

0x110D

A/V Remote Control 0x110E

Handsfree 0x111E

Audio Gateway (HFP) 0x111F

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BTM510/511

Bluetooth® Multimedia Module

CONFIGURING

THE BTM510/511

Table 3-1: S-Register List

S0 1 -1..15 Number of RING indication before automatically answering an incoming

connection. A value of 0 disables autoanswer. If -1, then autoanswer on one

RING and do NOT send RING/CONNECT response to the host. This emulates a

serial cable replacement situation

Setting values >= 0, resets S Register 504 to 0 and <0 forces 504 to 1.

If S0 <> 0 and S100 <> 0 then S0 must be < S100. If a value is entered which

violates this rule, then ERROR 29 is sent in response.

If S504 =1 then this register will return -1, regardless of the actual value

stored in non-volatile memory.

S2 0x5E 0x20..0x7E Escape sequence character. It is not ‘+’ by default as a Bluetooth® serial link

can be used to connect to a mobile phone which exposes an AT command

set, which will in turn use ‘+’ as default. So if both used ‘+’ there will be

confusion. 0x5e is the character ‘^’.

S12 100 40..5000 Escape sequence guard time in milliseconds, with a granularity of 20ms. New

values are rounded down to the nearest 20ms multiple

S100 15 0..15 Number of RING indications before an auto disconnection is initiated. A value

of 0 disables this feature.

If S0 <> 0 and S100 <> 0 then S0 must be < S100. If a value is entered which

violates this rule, then ERROR 29 is sent in response.

S101 $1101 0..$ffff UUID of default SPP based prole when not specied explicitly in the ATD

command.

S102 1 1..0x7FF Denes a set of bits masks for enabling prole servers. Values can be ORed.

0x001 is Serial Port Prole

0x080 is A2DP

0x100 is AVRCP

S103 1 1..7 Boot Mode on cold boot.

S126 ? 0 .. 0xFFFF Primer for changing to Multipoint mode

S300 1 0..2 Set A2DP role:

0 is feature not set

1 is A2DP Sink (default)

2 is A2DP Source

S301 1 0..2 Set AVRCP role:

0 is feature disabled

1 is Control (CT) (default)

2 is Target (TG)

S302 0 0..4 Set AVRCP category:

0 is Feature disabled (default)

1 is Player/Recorder

2 is Monitor/Amplier

3 is Tuner

4 is Menu

8. ATSn=m {Set S Register}

As with modems, the Bluetooth module employs a concept of registers which are used to store

parameters, such as escape sequence character, inquiry delay time etc, as listed in detail below.

The value part ‘m’ can be entered as decimal or hexadecimal. A hexadecimal value is specied via

a ‘$’ leading character. For example $1234 is a hexadecimal number.

When S register values are changed, the changes are not stored in non-volatile memory UNTIL

the AT&W command is used. Note that AT&W does not affect S registers 520 to 525 or 1000

to 1010 as they are updated in non-volatile memory when the command is received.

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BTM510/511

Bluetooth® Multimedia Module

CONFIGURING

THE BTM510/511 REGISTER DEFAULT RANGE COMMENT

S303 0 0..0xFFFFFF Set Company ID:

IEEE Company ID, 24bit hexadecimal,

Required for UNIT INFO Response in AVRCP target mode, default value is 0.

S305 1 0..1 Accept UNIT INFO request:

0 – reject

1 – accept

S306 1 0..1 Accept SUBUNIT INFO request:

0 – reject

1 – accept

S310 1 0..1 Congure PASS THROUGH (PT) Response:

1 = Enable automatic PT-response, response type is read from S311, (default)

0 = Host is required to respond to PT-Indication, see ‘AT+AVR’

S311 1 w

9 r

0..7 (Write) Set automatic PT response:

This value is queried for automatic PT-Response, see Table 3-10.

The written value is mapped internal, that is why the Read-value is different

from the written value. The Read-value is actually sent out as response

S312 1 0..15 A2DP sink supported features (Bitmask) :

Bit 0 = Headphone (default)

Bit 1 = Speaker

Bit 2 = Recorder

Bit 3 = Amplier

S313 1 0..15 A2DP source supported features (Bitmask) :

Bit 0 = Player (default)

Bit 1 = Microphone

Bit 2 = Tuner

Bit 3 = Mixer

S320 2 1..3 Security Level: see [12], Generic Access Prole - Table 5.7

needs subsequent ‘AT&W’ and power cycle to take effect

S321 1 0..4 Set IO capability:

0 – display only

1 – display yes no

2 – keyboard only

3 – no input no output

4 – reject IO-cap requests

S322 0 0..1 Force man-in-the-middle-protection (MITM):

0 – disabled

1 – enabled

S323 0 0..1 Disable legacy (pre-BT2.1) Pairing:

0 – legacy pairing enabled

1 – legacy pairing disabled

S324 90 1..255 Secure Simple Pairing timeout in s

This value must be at least 90 in order to meet the recommendation

of BT2.1 specication

S325 1 0..1 Store link key automatically on dedicated bonding outgoing (DBO),

identical with S538

S326 1 0..1 Store link key automatically on general bonding outgoing (GBO)

S327 1 0..1 Store link key automatically on dedicated bonding incoming (DBI)

S328 1 0..1 Store link key automatically on general bonding incoming (GBI)

S329 0 0..1 Enable legacy (BISM2) response format

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BTM510/511

Bluetooth® Multimedia Module

CONFIGURING

THE BTM510/511 REGISTER DEFAULT RANGE COMMENT

S330 1 1..15 Congure inquiry response of AT+BTI (Bitmask):

1 – show device address

2 – show class of device

4 – show friendly name

8 – show extended inquiry data

Values can be ORed

S415 0 0..1 Enable Microphone Input Gain, adds extra 24dB to input gain

S416 0 0..1 Enable MicBias

S417 0 0..15 Set MicBiasCurrent

S418 0 0..15 Set MicBiasVoltage

S419 6 0..6 Set sampling rate for Audio Loopback Mode

0 = 8 kHz

1 = 11.025 kHz

2 = 16 kHz

3 = 22.050 kHz

4 = 24 kHz

5 = 32 kHz

6 = 44.1 kHz

S504 0 0..1 Setting to 1 will force S0 to -1 and will suppress messages arising from

connections or pairing. E.g. CONNECT, NO CARRIER, RING, PAIR etc.

Suppressing connection based messaged allows the device to be

congured in cable replacement mode.

S505 10 2..120 Minimum delay before abandoning connection attempt as a master.

Referenced by ATD. In units of seconds. See S Registers 530 and 543 also.

Please note that as disconnection time can vary, this register only guarantees

the minimum delay. Note that for invalid addresses specied in the ATD

command, the “NO CARRIER” response will be immediate. See S register

560 for specifying disconnect max timeout.

S506 1 0..1 Enable/Disable echoes. The ATEn command also affects this.

S507 0 0..2 When set to 0, a connection can be dropped using ^^^ escape sequence only

and the state of DSR line is ignored.

When set to 1 a connection can be dropped using EITHER the ^^^ escape

sequence OR the DSR handshaking line. When set to 2, a connection can

only dropped using a deassertion of DSR. Mode 2 provides for the highest

data transfer rate.

If the status of the DSR line is to be conveyed to the remote device as a low

bandwidth signal then this register MUST be set to 0, otherwise a deassertion

of DSR will be seen as a request to drop the Bluetooth® connection.

This register affects S Register 536 – see details of 536

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BTM510/511

Bluetooth® Multimedia Module

CONFIGURING

THE BTM510/511 REGISTER DEFAULT RANGE COMMENT

S512 1 0..7 Specify power up state.

When set to 0, AT+BTO is required to open the device for Bluetooth® activity.

When set to 1, it proceeds to a state as if AT+BTO was entered.

When set to 2, it will be discoverable only, similar to issuing AT+BTQ.

When set to 3, it will be connectable but not discoverable e.g. AT+BTG

When set to 4, it will be connectable and discoverable e.g. AT+BTP.

When set to 5, it will be like 2, but all UART RX trafc is discarded in

absence of a connection while DSR is asserted. If DSR is not asserted,

then it behaves exactly as per mode 2.

When set to 6, it will be like 3, but all UART RX trafc is discarded in

absence of a connection while DSR is asserted. If DSR is not asserted,

then it behaves exactly as per mode 3.

When set to 7, it will be like 4, but all UART RX trafc is discarded in

absence of a connection while DSR is asserted. If DSR is not asserted,

then it behaves exactly as per mode 4.

Note that by implication, a change to this can only be seen after a power

cycle AND if AT&W is actioned prior to the power cycle.

If S Reg 554 is non-zero and this register is between 2 and 7 inclusive,

then the value of S554 species the time in seconds that the device will

remain in the specied mode after power up. On timeout, the device will

fall back to the mode specied in S Register 555.

In some rmware builds, S Registers 565 to 569 inclusive are visible, which

allows the start-up mode to depend on the state of RI line (Setting S Reg 565

forces the RI pin to be congured as an input). For this feature to be active,

SReg 565 should be set to 1. In that case, on start-up, if RI is asserted, then

the start-up mode is dened by S Reg 566 and if deasserted then S Reg 567.

S514 10 1..60 Pairing Timeout in seconds. This includes the time a host takes to supply

the PIN number when PIN? messages are indicated.

S515 0x001F00 0.. 0xFFFFFF Default Device Class Code on power up. When queried, the value is always

printed as a hexadecimal number.

To change the device class of the module permanently, use this S register plus

subsequent AT&W and ATZ. To change the device class temporarily (until next

power cycle), use the command AT+BTC.

S516 0x000000 0..0x2FFFFFF Default Device Class lter to be used with AT+BTI when it is not explicitly

specied. When queried the value is always printed as a hex number.

The seventh most signicant digit, can be 0,1 or 2, and is used to specify

the type of device class lter.

When 0, it species no ltering.

When 1, it species an AND mask and all 24 bits are relevant

When 2, it species a lter to look for devices with matching major device

class which occupies a 5 bit eld from bits 8 to 12 inclusive (assuming

numbering starts at bit 0). All other 19 bits MUST be set to 0.

S517 20 2..61 Inquiry Length in units of seconds. This parameter is referenced by the

AT+BTI command.

S518 8 0..255 Maximum number of responses from an inquiry request. This parameter is

reference by the AT+BTI command. If this number is set too high, then

AT+BTI will return ERROR 27. For a particular rmware revision, determine

the effective maximum value by trial and error. That is, set to a high value,

send AT+BTI and if ERROR 27 is returned, then retry with a smaller value.

This effective max value will remain unchanged for that particular

rmware build.

S519 500 100..6000 When S507>0, and in a connection, DSR can be used to change from data

to command state by deasserting the DSR line for less than the time specied

in this register. This value is rounded down to the nearest 100ms

S530 1000 100..15000 Reconnect delay when congured as master in pure-cable-replacement

mode. This value is rounded down to the nearest 100ms. See S Register

505 and 543 also.

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BTM510/511

Bluetooth® Multimedia Module

CONFIGURING

THE BTM510/511 REGISTER DEFAULT RANGE COMMENT

S531 0 0..5 Species the mode on connection establishment.

0 = Normal, that data is exchanged between UART and RF

1 = LOCAL_COMMAND. UART input is parsed by the AT interpreter

and RF data is discarded

2 = REMOTE_COMMAND. RF input is parsed by the AT interpreter and UART

data is discarded. If S Reg 536 is not 1 then this register cannot be set

to 2 and an ERROR will be returned

3 = LOCAL_COMMAND. UART input is parsed by the AT interpreter

and incoming RF data is sent to the host using the RX<string>

asynchronous response.

4 = LOCAL_COMMAND and on the rf side, the gpio is automatically sent

when there is a change in input. See section 9.5 for more details.

5 = DEAMON mode

S532 0 0..7 If non zero then on every connection, a SCO channel (audio) will be initiated.

Bit 0 for HV1, Bit1 for HV2 and Bit2 for HV3. When the connection is lost,

the SCO channel disappears along with it.

S533 1 0..2 If set to 1 then GPIO5 follows RI state, if set to 2 then it follows the state of

DSR and if 0 it is not driven and GPIO5 is available as a user I/O.

This register will not necessarily be effective immediately after changing the

value. It must be saved to non-volatile memory using AT&W and will operate

as expected after an ATZ or a power cycle.

S534 1 0..2 When set to 0, GPIO4 is available as user i/o

If set to 1 then GPIO4 follows DCD state. If set to 2 then GPIO4 behaves

as per setting 1, but in addition, when not in a connection, if the device is

connectable or discoverable, then GPIO4 will blink.

This register will not necessarily be effective immediately after changing the

value. It must be saved to non-volatile store using AT&W and will operate as

expected after an ATZ or a power cycle.

S535 20 0..41 Link Supervision Timeout. If units go out of range, then a NO CARRIER

message will be sent to the host after the time specied here

S536 0 0..1 When set to 1, a remote device can ‘capture’ the AT parser of this unit by it

sending this module an escape “!!!” sequence. The inter character timing is

set via S Register 12.

If S Register 507 is >= 2, then reading this register will always return 0 and

writing 1 will result in ERROR 33.

S538 0 0..1 If 1, then when a successful pairing occurs, it is automatically saved in the

trusted device database – if it has room to store it.

S539 0 0..1 When set to 1, in idle mode (S512=1), UART Rx characters are discarded if

DSR is deasserted.

S541 6 -50..6 This sets the power level in dBm when inquiring or paging. Reading this

S542 6 -50..6 As per S541, however reading this register returns the current power level as

set in the base band. The read can be different from S541because the actual

power is set using a lookup table and the base band rounds down to the

nearest value in the table.

S543 0 0..1 If this is set to 1, then incoming pairing attempts will be accepted (if a pin

code has been pre-entered using AT+BTK) while in the wait phase of auto

connect cycle initiated by the AT+BTR command. In addition to accepting

pairing attempts, if the pairing is successful, then the new device is

automatically set as the peer address for automatic connections

(as if an explicit AT+BTR command was entered).

See S Register 505 and 530 also

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BTM510/511

Bluetooth® Multimedia Module

CONFIGURING

THE BTM510/511 REGISTER DEFAULT RANGE COMMENT

S551 0x3211 0xFFFF This register species in each 4 bit nibble, how the outgoing modem status

bits to the remote peer gets its value. Bluetooth® allows for RTR, RTC, DV

and IC bits to be exchanged over an RFCOMM connection.

Nibble 0..3 species the source for RTC

4..7 species the source for RTR

8..11 species the source for DV (i.e. DCD)

12..15 species the source for IC (i.e. RI)

Each nibble can take the following value:-

0 Always set to 0

1 Always set to 1

2 If DCD (pin 8 on module connector) is output then always 1

If DCD is input then 1 if DCD is asserted otherwise 0

3 If RI (pin 6) is output then always 0

If RI is input then 1 if RI is asserted otherwise 0

4 If DSR (pin 10) is asserted then 1 otherwise 0

In the event that a nibble species DSR as the source of its state, be aware

that if, S Register 507 is anything other than 0, a de-assertion of DSR will

cause the Bluetooth connection to be dropped.

If bits 0..3 and 4..7 are set to 0, then some Bluetooth devices will use

that as a signal to stop sending any data back. For example, Nokia 6310

stops responding.

If this register is changed while in command and connected mode, then

on going back online using the ATO command, a fresh signal will be sent

to the peer to update the bits.

S552 0x0122 0x0FFF This register species in each 4 bit nibble, how the DTR, DCD, RI output

pins are controlled when in a Bluetooth connection

Nibble 0..3 species the source for DTR

4..7 species the source for DCD

8..11 species the source for RI

Each nibble can take the following value:-

0 Do NOT touch the I/O

1 Always deassert

2 Always assert

3 If RTC bit in CONTROL_IND is 1 then assert otherwise deassert

4 If RTR bit in CONTROL_IND is 1 then assert otherwise deassert

5 If DV bit in CONTROL_IND is 1 then assert otherwise deassert

6 If IC bit in CONTROL_IND is 1 then assert otherwise deassert

If this register is changed while in command and connected mode, then

on going back online using the ATO command, the modem output lines

will get refreshed.

S553 0x0201 0x0FFF This register species in each 4 bit nibble, how the DTR,DCD,RI output pins

are controlled when NOT in a Bluetooth connection

Nibble 0..3 species the source for DTR

4..7 species the source for DCD

8..11 species the source for RI

In addition it also refers to S Register 552 to see if the relevant pin is an

input or not to be touched. If the nibble in 552 is 0, then the relevant pin

is an input.

Each nibble can take the following value:-

0 Always deassert

1 Always assert

2 Assert if RING is being sent to the host

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BTM510/511

Bluetooth® Multimedia Module

CONFIGURING

THE BTM510/511 REGISTER DEFAULT RANGE COMMENT

S554 0 0..900 If S Register 512>=2 and <=7 then this register species a time in seconds

for which the device will stay in the S512 mode after power up or reset. On

timeout, it will abort the discoverable and/or connectable and fall back into

S512=1 mode, when it is deaf and dumb.

Note that if AT+BTR has been used to specify a peer device, then on reverting

to mode 1, it will attempt to make a connection to that peer device.

A power cycle, reset via BREAK or ATZ is required to see the effects of change.

S555 1 1..7 If S Register 554 is nonzero, then after the post reset window expires,

the mode will revert to the mode specied in this register. This allows,

for example, the device to be discoverable and connectable on power up

(mode 4 or 7) and on window timer expiry to revert to connectable only

(mode 3 or 6).

A power cycle, reset via BREAK or ATZ is required to see effects of a change.

In some rmware builds, S Registers 565 to 569 inclusive are visible, which

allows the start-up mode to depend on the state of RI line (Setting S Reg 565

forces the RI pin to be congured as an input). For this feature to be active,

SReg 565 should be set to 1. In that case, on start-up, if RI is asserted, then

the start-up mode is dened by S Reg 568 and if deasserted then S Reg 569.

S558 0 0..1 When 1, the following responses; “RING”, “NO CARRIER” and “CONNECT”

are replaced by “BTIN”, “BTDOWN” and “BTUP” respectively. This will

eliminate ambiguity when the module has a Bluetooth connection to an AT

modem which also gives these responses.

S559 0 0..3 This species a mask.

When Bit 0 is 1, the response word “ERROR“ is replaced by “BTERR” and

“OK” is replaced by “ok”.

When Bit 1 is 1, then error responses do not include the error number and

instead the error number can be retrieved using ATI12.

S560 15 15..120 Disconnect timeout in seconds. This timer species how long to wait for

conrmation from the peer device and/or the underlying stack that the

connection has been successfully torn down. There can be instances where

a conrmation does not arrive and so in this case this timer is used to ‘close

off’ the procedure and put the state machine back into a proper mode for

new operations.

Time is specied with 15 seconds intervals.

S565 0 1 If set to 1, RI (Ring Indicate) line is congured as an input and forces the

start-up mode (SReg512) and post-timeout on Start-up mode (SReg555)

to be dependent on the state of RI. The RI conditional modes are dened

by SRegs 566 to 569 inclusive.

S566 1 7 If S565=1, and RI is asserted then this is the mode the device will start up in.

S567 1 7 If S565=1, and RI is deasserted then this is the mode the device will

start up in.

S568 1 7 If S565=1, and RI is asserted then this is the mode the device will assume

after the post-start-up timeout dened in SReg 554 instead of mode dened

in SReg555

S569 1 7 If S565=1, and RI is deasserted then this is the mode the device will assume

after the post-start-up timeout dened in SReg 554 instead of mode dened

in SReg555

S584 0 0..1 Enable/Disable eSCO

When changing the unit returns ERROR 14 it implies the device is either in

a connection or waiting for a connection and so the new value cannot be

accepted. For the former, drop the connection, then issue the command

AT+BTX and then set the new value and for the latter issue the command

AT+BTX prior to setting the register.

S588 0 0..1 After a disconnection, there will be a cold reset

S589 15 0..22 Codec output gain

S590 15 0..22 Codec input gain

S591 0 0..1FF Default GPIO output states when not in a connection. This is used when

virtual digital i/o cable replacement mode is in operation

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Laird Technologies

BTM510/511

Bluetooth® Multimedia Module

CONFIGURING

THE BTM510/511 REGISTER DEFAULT RANGE COMMENT

S592 0 0..1 Set this to 1 to reduce the trusted device database to just 1 record

when autosaving of pairing is enabled via S reg 538

S593 0 0..1 Automatically append last 6 digits of local bluetooth address to the

friendlyname which was set via AT+BTN or AT+BTF

S689 0 -450..+215 Set codec output gain in dBr * 10

(applies to sink), default = 0

S690 0 -450..+215 Set codec input gain in dBr * 10

(applies to source), default = 0

S730 0 0..1 Enable Auxiliary DAC

S731 0 0..225 Set Auxiliary DAC Level

9. ATSn? {Read S Register Value}

This will return the current value of register n.

For recognised values of n

Response: <cr,lf>As Appropriate<cr,lf>OK<cr,lf>

For unrecognised values of n

Response: <cr,lf>ERROR nn<cr,lf>

10. ATSn=? {Read S Register – Valid Range}

This will return the valid range of values for register n.

For recognised values of n

Response: <cr,lf>Sn:(nnnn..mmmm)<cr,lf>OK<cr,lf>

For unrecognised values of n

Response: <cr,lf>ERROR nn<cr,lf>

11. ATZ<n> {Hardware Reset and emerge into mode ‘n’}

Forces the device through a hardware reset which means it will eventually come alive in the local

command and unconnected mode. This allows changes to the PS store to take effect. The module

will issue an OK response after the reset is complete and it is ready to receive commands once again.

ATZ and ATZ0 signify reset and emerge into the current mode (see command ATI14). ATZ1 to ATZ4

instructs the module to reset and then emerge into the appropriate boot mode. Note that S Reg 103

species the boot mode from cold.

Response: <cr,lf>OK<cr,lf> and OK is returned after the RESET

12. AT&W {Write S Registers to Non-volatile Memory}

Writes current S Register values to non-volatile memory so that they are retained over a power cycle.

Response: <cr,lf>OK<cr,lf>

Response: <cr,lf>ERROR nn<cr,lf>

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Laird BTM511 User manual

Brand: Laird

Model: BTM511

Category: Bluetooth music receivers

Type: User manual

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