Ezurio BISMS02BI-01 User manual

www.ezurio.com DSH_BT024-00200_1v4 © Ezurio Ltd 2006 1

Embedded Intelligent Bluetooth™ Serial Module

Part Number: BISMS02BI-01

1. General Description

Ezurio’s Em edded Intelligent Bluetooth Serial Module is a fully integrated and qualified Class 1 Bluetooth solution

designed for lowest cost of integration and ownership for designers wishing to include Bluetooth functionality in

their products. The module is qualified to Bluetooth Version 2.0.

The Em edded Intelligent Bluetooth Serial Module is designed to give a rugged solution that is ideal for industrial

automation and ruggedised handheld devices. It works over a wide temperature range of -40°C to +85°C. The

physical form of the module allows designers to mount the antenna section of the module outside a screened

enclosure.

The Em edded Intelligent Serial Module is ased on Cam ridge Silicon Radio’s BlueCore4 chipset. The module

contains all of the hardware and firmware for a complete Bluetooth solution, requiring no further components.

The Module has an integrated, high performance antenna which is matched with the Bluetooth RF and ase and

circuitry. The firmware integrated into the module implements the higher layer Bluetooth protocol stack, up to

and including the Generic Access Profile (GAP), Service Discovery Profile (SDAP), Serial Port Profile (SPP) and

Audio Gateway. A virtual processor is used within the BC04 to implement an AT command processor. This

interfaces to the host system over a straight forward serial port using an extensive range of AT commands. The

AT command set a stracts the Bluetooth protocol from the host application, saving many months of programming

and integration time. It provides extremely short integration times for data oriented ca le replacement and voice

applications. A low cost development system and integrated RS232 products with the same firmware are

availa le for fast product evaluation and development.

An alternative version of firmware is availa le that provides support for multi-point applications.

The Module can e configured so that it can e attached to a ‘dum ’ terminal or attached to a PC or PDA for ca le

replacement applications.

In addition to the Bluetooth functionality, The Em edded Intelligent Serial Module provides access to 6 General

I/O lines and one ADC input. These can e configured to extend the UART control or to provide connection to

simple devices such as switches or LEDs without requiring any external processing. The GPIO lines can e

accessed either via the wired host UART connection, or remotely over the Bluetooth link. Support is also provided

for a PCM connection to an external audio codec.

The Em edded Intelligent Bluetooth Module is supplied in a small form factor PCB (17.7mm x 46.0mm x 5.0mm),

that solders directly. The module includes a high sensitivity, high gain antenna which provides excellent range.

Typical open field performance provides ranges of over 250 metres at transmit powers of 4mW.

Support is provided for low power modes that make the Em edded Intelligent Bluetooth Module particularly

applica le to attery powered installations.

The Em edded Intelligent Bluetooth Module is Lead-free and RoHS compliant and supports an industrial operating

temperature range of -40°C to +85°C.

1.1 Applications

•POS Equipment •Automotive Applications

•Industrial Automation •Telematics

•Vending Equipment •Medical

Bluetooth is a trademark owned y Bluetooth SIG, Inc., USA, and is licensed to Ezurio Ltd

www.ezurio.com DSH_BT024-00200_1v4 © Ezurio Ltd 2006 2

2. Features

Feature Implementation

Bluetooth Transmission Class 1

Fully Bluetooth pre-qualified Bluetooth 2.0

Range 250 metres typical (free space)

Frequency 2.400 – 2.485 GHz

Max Transmit Power +6dBm

Min Transmit Power -27dBm

Receive Sensitivity Better than -86dB

Data Transfer rate Up to 300K ps over UART.

Serial Interface RS-232 i-directional for commands and data using AT commands

Serial parameters Default 9600,n,8,1 - Configura le from 1,200 ps to 961,200 ps.

7 it firmware is availa le – please contact Ezurio

Support for DTR, DSR, DCD, RI, RTS, CTS

Physical size 17.7mm x 46.0mm x 5.0mm, 8g

Current consumption Less than 36mA during data transfer in standard power mode. Lower powers

are attaina le with a configura le low power mode.

Low power sniff mode 2.5mA typ

Temperature Range Normal operation: -40°C to +85°C

Supply Voltage 3.3V – 7.0V

Interface Levels 3.0V Logic

Audio Audio can e transferred over SCO channels through the PCM interface at

64k ps. PCM can e configured as master or slave.

Support for dual slave PCM connections.

Profiles Server - SPP (Full), DUN, Audio Gateway, Headset, Handsfree

Client - All RFCOMM ased profiles

Multipoint Max 7 slaves with multipoint

Field upgradea le Over UART

Protocols Single point firmware is controlled and configured using AT Commands.

Standard multipoint firmware uses a simple packet ased protocol and

requires a host to ena le the module to function effectively.

Single point only allows a point to point connection whereas multipoint allows

more than one simultaneous connection.

GPIO 6 x digital (DTR can also e allocated as GPIO)

ADC 1 x 8 it

Indicators Pads for 2 programma le LEDs

Lead free Lead-free and RoHS compliant

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3. Functional Block Diagram

3.1 Connection Diagram

The Module is connected to a “mother” PCB y direct soldering to edge pads. With the exception of pads 36 – 38,

pads adjacent to the antenna do not provide an electrical connection, ut are used for additional mechanical

sta ility.

Antenna

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3.2 Pin Descriptions

The ta le elow defines the pin functions. Refer to the previous section for the pin location

No.

Signal Description Pin

No.

Signal Description

1 VCC 2 USB /RESERVED Do not connect

3 USB /RESERVED Do not connect 4 GND

5 RESET- Reset I/P * 6 GPIO_6 I/O for Host

7 GPIO_7 I/O for Host 8-19 N/C Do not Connect

20 GND 21 UART_DCD I/O for Host

22 UART_RI I/O for Host 23 UART_RTS Request to Send O/P

24 UART_RX Receive Data I/P 25 UART_CTS Clear to Send I/P

26 UART_TX Transmit Data O/P 27 UART_DTR

(GPIO_3)

I/O for Host

28 UART_DSR Input 29 GND

30 PCM_SYNC PCM Sync I/P 31 PCM_IN PCM Data I/P

32 PCM_CLK PCM Clock I/P 33 PCM_OUT PCM Data O/P

34 GPIO_9

PCM_SLVCLK

I/O for Host (Slave

PCM Clock)

35 GPIO_5 I/O for Host (LED2)

36 GPIO_4 I/O for Host (LED1) 37 Analogue_0 ADC

38 GPIO_8 I/O for Host 39-42 N/C Do not connect

Notes:

* The reset line has a fixed 10kOhm pull up resistor with the reset eing active low.

PIO lines can e configured through software to e either inputs or outputs with weak or strong pull-ups or pull-

downs. At reset, all PIO lines are configured as inputs with weak pull-downs.

UART_RX, UART_TX, UART_CTS, UART_RTS, UART_RI, UART_DCD and UART_DSR are all 3.0v level logic. For

example, when RX and TX are idle they will e sitting at 3.0V. Conversely for handshaking pins CTS, RTS, RI,

DCD, DSR a 0v is treated as an assertion.

Pin 22 (UART_RI) is active low. It is normally 3.0v. When a remote device initiates a connection, this pin goes

low. This means that when this pin is converted to RS232 voltage levels it will have the correct voltage level for

assertion.

Pin 21 (UART_DCD) is active low. It is normally 3.0v. When a connection is live this pin is low. This means that

when this pin is converted to RS232 voltage levels it will have the correct voltage level for assertion.

Pin 28 (UART_DSR) is an input, with active low logic. It should e connected to the DTR output of the host. When

the Module is in high speed mode (See definition for S Register 507), this pin should e asserted y the host to

ensure that the connection is maintained. A deassertion is taken to mean that the connection should e dropped,

or an online command mode is eing requested.

The GPIO pins can e accessed using S Registers in the range 623 to 629. GPIO4 and 5 are connected to

unpopulated LED pads on the module. If these I/O pins are set for input, then the LED will e driven y the host

and appropriate drive current requirements must e satisfied. A Logic 1 switches on the LED.

GPIO3 is shares the pin with DTR output (active low). See S Register 552 & 553.

Analogue 0 input should not exceed 1.8v. S Register 701 is used to access it.

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3.3 Electrical Speci ications

3.3.1 Absolute Maximum ratings

A solute maximum ratings for supply voltage and voltages on digital and analogue pins of the Module are listed

elow; exceeding these values will cause permanent damage.

Parameter Min Max Unit

Peak current of power supply 0 100 mA

Voltage at digital pins -0.3 3.3 V

Voltage at POWER pin 3.3 7 V

3.3.2 Recommended Operating Parameters

3.3.2.1Power Supply

Signal Name Pin No I/O Voltage level Comments

Vcc 1 I 3.3V to 7.0V Ityp = 30mA

GND 4, 20, 29

The module contains a power on reset circuit that ensures the module is reset at power on. The internal reset

circuit is triggered when the input voltage to the module drops elow ~1.7V and is hence only suita le for

providing a power on reset signal. If the supply voltage to the module can drop elow the minimum voltage level

in normal operation, then it is recommended that an external rownout circuit is provided to assert the module

reset and to ensure that the module is reset when the module supply voltage drops elow 3.1V.

This will ensure that the module will return to an operational state when the supply voltage comes ack within

specification. For example, if the module supply can drop to 2.7V and then e restored to 3.3V there is no

guarantee that the module will still e operational unless the reset signal has een asserted.

3.3.2.2RS-232 Inter ace

Signal Name Pin No I/O Signal level Comments

UART_TX 26 O VOLmax=0.2V

VOHmin=2.8V

UART_RX 24 I VILmax=0.8V

VIHmin=2.1V

VIHmax=3.4V

UART_CTS 25 I VILmax=0.8V

VIHmin=2.1V

VIHmax=3.4V

UART_RTS 23 O VOLmax=0.2V

VOHmin=2.8V

UART_DSR 28 I VILmax=0.8V

VIHmin=2.1V

VIHmax=3.4V

UART_DTR 27 O VOLmax=0.2V

VOHmin=2.8V

Shared with GPIO_3

UART_RI 22 I or O O/P : VOLmax=0.2V

VOHmin=2.8V

I/P : VILmax=0.8V

VIHmin=2.1V

Direction may e programmed.

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VIHmax=3.4V

UART_DCD 21 I or O O/P : VOLmax=0.2V

VOHmin=2.8V

I/P : VILmax=0.8V

VIHmin=2.1V

VIHmax=3.4V

Direction may e programmed.

UART_RX, UART_TX, UART_CTS, UART_RTS, UART_RI, UART_DCD and UART_DSR are all 3.0v level logic. For

example, when RX and TX are idle they will e sitting at a nominal 3.0V. Conversely for handshaking pins CTS,

RTS, RI, DCD, DSR a 0v is treated as an assertion.

3.3.2.3General Purpose I/O and ADC

Signal Name Pin No I/O Signal level Comments

GPIO 4, 5, 6, 7,

8, 9

36, 35,

6, 7, 38,

I or O O/P : VOLmax=0.2V

VOHmin=2.8V

I/P : VILmax=0.8V

VIHmin=2.1V

VIHmax=3.4V

GPIO_4 and 5 are shared with the

on oard LED pads.

GPIO_9 is also used for

PCM_SLVCLK.

GPIO 3 27 I or O O/P : VOLmax=0.2V

VOHmin=2.8V

I/P : VILmax=0.8V

VIHmin=2.1V

VIHmax=3.4V

Shared with DTR

ADC 0 37 I Range 0 – 1.8V ADC

PIO lines can e configured through software to e either inputs or outputs with weak or strong pull-ups or pull-

downs. At reset, all PIO lines are configured as inputs with weak pull-downs.

3.3.2.4PCM Inter ace

Signal Name Pin No I/O Signal level Comments

PCM_CLK 32 I or O O/P : VOLmax=0.2V

VOHmin=2.8V

I/P : VILmax=0.8V

VIHmin=2.1V

VIHmax=3.4V

If unused keep pins open

PCM_IN 31 I VILmax=0.8V

VIHmin=2.1V

VIHmax=3.4V

PCM_SYNC 30 I or O O/P : VOLmax=0.2V

VOHmin=2.8V

I/P : VILmax=0.8V

VIHmin=2.1V

VIHmax=3.4V

PCM_OUT 33 O VOLmax=0.2V

VOHmin=2.8V

PCM_SLV_CLK O O/P : VOLmax=0.2V Availa le as a clock when two

connected devices are oth in PCM

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(GPIO9) VOHmin=2.8V slave mode.

Shared with GPIO_9

3.3.2.5Miscellaneous

Function Signal Name Pin No I/O Signal level Comments

Reserved USB D- 3 I VILmax =0.3vdd_us

VIHmin =0.7vdd_us

Normally inactive.

Pull to GND through

10K

Reserved USB D+ 2 I VILmax =0.3vdd_us

VIHmin =0.7vdd_us

Normally inactive.

Pull to GND through

10K

Reset RESET 5 I Threshold 2.6V Active LOW

Terminology:

USB Signal Levels. vdd_us refers to the internal voltage generated y the LDO regulator on the module, which

is typically 3.1V. Hence 0.3vdd_us and 0.7vdd_us correspond to 0.9 V to 2.1V. If Vcc falls elow the

recommended minimum of 3.3V, USB operation cannot e guaranteed.

The USB lines cannot e accessed when using AT firmware.

4. I/O Characteristics

4.1 Power Consumption

The current drain from the Vcc power input line is dependent on various factors. The three most significant factors

are the voltage level at Vcc, UART Baudrate and the operating mode.

The hardware specification for the Module allows for a voltage range of 3.3 to 7.0 at Vcc. Tests have shown that

where power drain is an issue, it is est to keep Vcc at the lower end of the range.

The UART Baudrate has a earing on power drain ecause as is normal for digital electronics, the power

requirements increase linearly with increasing clocking frequencies. Hence higher audrates result in a higher

current drain.

Finally with regards to operating mode the significant modes are; idle, waiting for a connection, inquiring,

initiating a connection, sniff and connected. With connected mode, it is also relevant to differentiate etween no

data eing transferred and when data is eing transferred at the maximum rate possi le. The AT command Set

document descri es how to configure the Module for optimal power performance.

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5. DC Characteristics

5.1 RF Per ormance

5.1.1 Transmit Power

Conducted Transmit Power min: 1.0mW (0dBm) max: 4mW (6dBm)

E ective Transmit Power min:0dBm Max: +6dBm

Output power can e reduced y program control

5.1.2 Receive Sensitivity

Receive Sensitivity -86dBm (at 25°C)

Antenna Gain +2dBi typ

E ective Receive Sensitivity -88dBm (at 25°C)

5.2 Range

Range is determined y the environment and the orientation of the module.

The data throughput of the Module is limited to 300K ps y the parsing of the data eing transferred through the

RFCOMM stack.

6. Functional Description

The Em edded Intelligent Bluetooth module is a self-contained Bluetooth product and requires only power to

implement full Bluetooth communication. The integrated, high performance antenna together with the RF and

Base- and circuitry provides the Bluetooth wireless link and the UART interface provides a connection to the host

system.

The variety of interfaces and the AT command set allow the Em edded Intelligent Bluetooth Module to e used for

a wide num er of short range wireless applications, from simple ca le replacement to complex multipoint

applications, where multiple radio links are active at the same time.

The complexity and flexi ility of configuration are made simple for the design engineer y the integration of an

extremely comprehensive set of AT commands, supplemented with a range of “S” registers which are used for

non-volatile storage of system parameters. These are fully documented in the “Blu2i AT Command Reference

Manual”.

6.1 Inter aces

6.1.1 UART inter ace

UART_TX, UART_RX, UART_RTS and UART_CTS form a conventional asynchronous serial data port with

handshaking. The interface is designed to operate correctly when connected to other UART devices such as the

16550A. The signalling levels are nominal 0V and 3.0V and are inverted with respect to the signalling on an

RS232 ca le. The interface is programma le over a variety of aud rates; no, even or odd parity. The default

condition on power-up is pre-assigned in the external Flash. Two-way hardware flow control is implemented y

UART_RTS and UART_CTS. UART_RTS is an output and is active low. UART_CTS is an input and is active low.

These signals operate according to normal industry convention.

By writing different values to the relevant S register the UART_RI can e continuously polled to detect incoming

communication. The UART_RI signal serves to indicate incoming calls.

UART_DSR is an active low input. It should e connected to DTR output of the host. When the module is running

in high speed mode (See definition for S Reg 507), this pin should e asserted y the host to ensure connection is

maintained. A de-assertion is taken to mean that the connection should e dropped, or an online command mode

is eing requested.

The module communicates with the customer application using the following signals:

RS-232

Port /TXD @ application sends data to the module’s UART_RX signal line

Port /RXD @ application receives data from the module’s UART_TX signal line

Figure 6.1 : UART interfaces

Note that the serial module output is at 3.0V CMOS logic levels. Level conversion must e added to interface with

an RS-232 level compliant interface.

6.1.2 GPIO Port

Eight lines of programma le i-directional input/outputs (I/O) are provided that can e accessed either via the

UART port, or Over The Air (OTA) from a second Bluetooth unit. These can e used as data inputs or to control

external equipment. By using these in OTA mode, an em edded Bluetooth Serial module can e used for control

and data acquisition without the need for any additional host processor. A further line can e used as an input.

Each of the GPIO ports can e independently configured to e either an Input or Output. A selection of ports can

e accessed synchronously.

The ports are powered from VCC. The mode of these lines can e configured and the lines are accessed via S

Registers in the range 623 to 629.

Low latency I/O can e accessed y using Ezurio’s I/O via an enhanced inquiry process.

6.1.3 PCM CODEC Inter ace

PCM_OUT, PCM_IN, PCM_CLK and PCM_SYNC carry up to three i-directional channels of voice data, each at

8ksamples/s. The format of the PCM samples can e 8- it A-law, 8- it µ-law, 13- it linear or 16- it linear. The

PCM_CLK and PCM_SYNC terminals can e configured as inputs or outputs, depending on whether the module is

the Master or Slave of the PCM interface.

In applications where the PCM master cannot supply a clock signal, the module can e configured to generate a

clock signal on this GPIO: PCM_SLVCLK. Please contact an Ezurio FAE for further details.

The Module is compati le with the Motorola SSI TM interface and interfaces directly to PCM audio devices

including the following:

6.1.3.1Compatible Codec Chips

•Qualcomm MSM 3000 series and MSM 5000 series CDMA ase and devices

•OKI MSM7705 four channel A-law and µ-law CODEC

•Motorola MC145481 8- it A-law and µ-law CODEC

•Motorola MC145483 13- it linear CODEC

6.1.4 ADC

The module provides access to one 8- it ADC. This provides an input range of 0mV to 1,800mV, which can e

read using S register 701.

Suita le external scaling and over-voltage protection should e incorporated in your design. The module provides

5 samples per second at the UART with a aud rate of 115,200 or a ove.

Low latency access of the upper 6 its of the ADCs can e o tained y using Ezurio’s I/O via an enhanced inquiry

process.

6.1.5 LEDs

Pads are provided to allow two LEDs to e added for diagnostic purposes. They are controlled y an S registers

624 and 625 to display the status of various parameters and are useful for de ug and test.

7. Integrated Firmware

7.1 General

The Em edded Intelligent Serial Module has een designed to provide the fastest route to market for designers

who wish to use Bluetooth to wirelessly ena le their products. To achieve this Ezurio has implemented a wide

ranging set of AT commands that control all of the standard Bluetooth tasks. These remove the complexity of

Bluetooth from the design engineer and allow the wireless link to e controlled y means of a simple set of

commands.

For applications where multiple concurrent live connections need to e maintained a variant of firmware is

availa le which is specifically targeted at multipoint operation.

For oth applications a comprehensive range of windows ased software is availa le to speed up the design

process. A low cost development kit is also availa le that can e used for prototyping oth ca le replacement

and multipoint applications.

7.2 Pro iles

Bluetooth has een designed to accommodate a very wide range of wireless applications. To ena le these

different applications the Bluetooth SIG (Special Interest Group) has defined a series of different profiles that

define the way in which Bluetooth devices communicate with each other and perform asic functions. These

provide a ase line of interopera ility for specific application scenarios, upon which more complex user

applications can e developed.

There are over 30 different profiles, many of which have een developed for specific applications. The Em edded

Intelligent Serial Module firmware is provided with support for the profiles that are most commonly required for

ca le replacement applications.

The current profiles support includes:

GAP Generic Access Profile The ase connection profile upon which others are ased.

SDP Service Discovery Profile The profile to find other Bluetooth devices and the services

they support.

SPP Emulation of a serial ca le for ca le replacement applications.

DUN Dial Up Networking Profile support for connection to an external PSTN, GSM, GPRS

or VPN connection.

AG Audio Gateway The ase element for Headset and Handsfree profile. A portion

of these profiles must e implemented within the host system.

HSP Headset Profile Supports early implementations of headsets. Now largely

replaced y the:

HFP Hands-free profile which provides more control over the headset operation.

FTP File Transfer Profile (full client support).

For other profile support, please contact EZURiO at [email protected]

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