BISM2 Bluetooth™ Version 2.0 Serial Module
1. General Description
Ezurio’s BISM2 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 incorporate Bluetooth
functionality into their products. The module is qualified to Bluetooth Version 2.0.
The BISM2 Bluetooth Serial Module is one of the most compact complete Bluetooth solutions, making
it ideal to integrate into handheld devices. However a version of the BISM2 module is available that
retains the same board size, mounting holes and connector as the previous Bluetooth Module from
Ezurio, allowing users to access the improved radio performance and functionality without the need
for any pcb modifications.
The BISM2 Module is based on Cambridge Silicon Radio’s BlueCore 04 chipset. The module contain
sall 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
baseband circuitry. The firmware integrated into the BC04 chipset implements the higher layer
Bluetooth protocol stack, up to and including the Generic Access Profile (GAP), Service Discovery
Profile (SDAP), Serial Port Profile (SPP), Dial Up Networking Profile (DUN), Headset Profile (HSP),
Hands Free Profile (HFP), File Transfer Profile (FTP) 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 abstracts
the Bluetooth protocol from the host application, saving many months of programming and
integration time. It provides extremely short integration times for data oriented cable replacement
and voice applications. A low cost development system is available for fast product evaluation and
development.
An alternative version of firmware is available that provides programming support for multi-point
applications.
The Module can be configured so that it can be attached to a ‘dumb’ terminal or attached to a PC or
PDA for cable replacement applications.
In addition to the Bluetooth functionality, The BISM2 Module provides access to 9 General I/O lines
and 2 analogue input and output lines. These can be configured to provide connection to simple
devices such as switches or LEDs without requiring any external processing. Both the GPIO and ADC
lines can be accessed either via the wired host UART connection, or remotely over the Bluetooth link.
The BISM2 module is supplied in a small form factor pcb (22.0mm x 34.0mm x 7.6mm), that
connects to a main pcb using a 40 way Hirose connector. The interface is compatible with the BISM1
module. 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 BISM2 particularly applicable to battery
powered installations.
The BISM2 module is Lead-free and is RoHS compliant and supports an industrial temperature range
of -40°C to +85°C.
1.1 Applications
•
•
•
POS Equipment
Medical Equipment
Telematics
•
•
•
Voice Applications
Industrial Automation
Automotive Applications
Bluetooth is a trademark owned by Bluetooth SIG, Inc., USA, and is licensed to Ezurio Ltd
Module shown without RF shield
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3. Functional Block Diagram
3.1 Connection Diagram
The Module is equipped with a 40-pin 0.5mm pitch board-to-board connector that connects to the
application platform.
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3.2 Pin Descriptions
The Hirose DF12C board-to-board connector on the module is a 40-pin double-row receptacle.
The table below defines the pin functions. Note that this pin-out is as viewed from the underside of
the Module.
Pin Signal
No.
Description
Pin Signal
No.
Description
1
Analogue 0
1.8v Max
2
GPIO1
I/O for Host.
I/O for Host
3
Analogue 1
SPI_MISO
SPI_CSB
SPI_CLK
GND
1.8v Max
4
GPIO2
5
SPI bus serial O/P
SPI bus chip select I/P
SPI bus clock I/P
6
UART_RI
UART_DCD
UART_DSR
‘Ring’ Input or Output
Input or Output
Input
7
8
9
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
GPIO3/UART_DTR I/O for Host
RESET
Reset I/P *
GPIO4
I/O for Host & LED
GND
GPIO5
I/O for Host
SPI_MOSI
UART_CTS
UART_TX
UART_RTS
UART_RX
VCC_3V3
VCC_5V
N/C
SPI bus serial I/P
Clear to Send I/P
Transmit Data O/P
Request to Send O/P
Receive Data I/P
3.3V Monitor
GND
PCM_CLK
PCM_IN
PCM_SYNC
PCM_OUT
N/C
PCM Clock I/P
PCM Data I/P
PCM Sync I/P
PCM Data O/P
3.6V < VIN < 7.0V
GND
USB / RESERVED
USB / RESERVED
GND
Do not connect
Do not connect
GPIO6 **
GPIO7 **
GPIO8 **
GPIO9
I/O for Host
I/O for Host
I/O for Host
I/O for Host
GND
N/C
Notes:
* The reset circuitry within the BISM Serial Modules now incorporates a brown-out detector within
the module. Customers migrating from previous modules should check their implementation, as they
may be able to simplify their external power supply design. The reset line has a fixed 10kOhm pull
down resistor to ground.
** Pins 33, 35 and 37 were N/C on BISM1. Pin 39 was a 1V8 monitor. Designers migrating between
designs should be aware that these are now available as I/O. Default configuration is as an input
PIO lines can be configured through software to be 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 3.3v level
logic. For example, when RX and TX are idle they will be sitting at 3.3V. Conversely for handshaking
pins CTS, RTS, RI, DCD, DSR a 0v is treated as an assertion.
Pin 6 (UART_RI) is active low. It is normally 3.3v. 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.
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Pin 8 (UART_DCD) is active low. It is normally 3.3v. 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 10 (UART_DSR) is an input, with active low logic. It should be connected to the DTR output of the
host. When the BISM2 Module is in high speed mode (See definition for S Register 507), this pin
should be asserted by the host to ensure that the connection is maintained. A deassertion is taken to
mean that the connection should be dropped, or an online command mode is being requested.
Pin 27 (VCC_3V3 monitor) may only be used for monitoring purposes. It must not be used as a
current source.
The GPIO pins can be accessed using S Registers 621 to 628. GPIO4 is connected to an LED on the
module. If these I/O pins are set for input, then the LED will be driven by the host and appropriate
drive current requirements must be satisfied. A Logic 1 switches on the LED.
GPIO3 is also used for DTR output (active low). See S Register 552 & 553.
Analogue 0 and 1 should not exceed 1.8v and S Registers 701 and 702 are used to access them.
3.3 Electrical Specifications
3.3.1
Absolute Maximum ratings
Absolute maximum ratings for supply voltage and voltages on digital and analogue pins of the Module
are listed below; exceeding these values will cause permanent damage.
Parameter
Min
0
Max
100
3.7
7
Unit
mA
V
Peak current of power supply
Voltage at digital pins
Voltage at POWER pin
-0.3
3.6
V
3.3.2
Recommended Operating Parameters
3.3.2.1
Sumber Kuasa
Signal Name
Vcc
Pin No
I/O
Voltage level
Comments
29
I
3.6V to 7.0V
Ityp = 30mA
GND
11, 15, 18,
30, 36, 38
6 Ground terminals to be attached
in parallel
VCC_3V3
27
O
3.3V typical
For monitoring only. No current
source
3.3.2.2
RS-232 Interface
Signal Name
Pin No
I/O
Signal level
Comments
VOLmax=0.2V
VOHmin=2.8V
UART_TX
21
O
VILmax=0.8V
VIHmin=2.1V
VIHmax=3.7V
UART_RX
25
19
I
I
VILmax=0.8V
VIHmin=2.1V
VIHmax=3.7V
UART_CTS
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UART_RTS
UART_DSR
23
10
O
I
VOLmax=0.2V
VOHmin=2.8V
VILmax=0.8V
VIHmin=2.1V
VIHmax=3.7V
VOLmax=0.2V
UART_DTR
UART_RI
12
6
O
Shared with GPIO3
VOHmin=2.8V
O/P : VOLmax=0.2V
VOHmin=2.8V
I or O
Direction may be programmed.
I/P : VILmax=0.8V
VIHmin=2.1V
VIHmax=3.7V
O/P : VOLmax=0.2V
VOHmin=2.8V
UART_DCD
8
I or O
Direction may be programmed.
I/P : VILmax=0.8V
VIHmin=2.1V
VIHmax=3.7V
3.3.2.3
SPI Bus
Signal Name
Pin No
I/O
Signal level
VILmax=0.8V
VIHmin=2.1V
VIHmax=3.7V
VOLmax=0.2V
VOHmin=2.8V
VILmax=0.8V
VIHmin=2.1V
VIHmax=3.7V
VILmax=0.8V
VIHmin=2.1V
VIHmax=3.7V
Comments
SPI_MOSI
17
I
Used to reprogram Flash
SPI_MISO
SPI_CSB
5
7
O
I
SPI_CLK
9
I
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3.3.2.4
PCM Interface
Signal Name
Pin No
I/O
Signal level
O/P : VOLmax=0.2V
VOHmin=2.8V
Comments
PCM_CLK
20
I or O
If unused keep pins open
I/P : VILmax=0.8V
VIHmin=2.1V
VIHmax=3.7V
VILmax=0.8V
PCM_IN
22
24
I
VIHmin=2.1V
VIHmax=3.7V
O/P : VOLmax=0.2V
VOHmin=2.8V
PCM_SYNC
I or O
I/P : VILmax=0.8V
VIHmin=2.1V
VIHmax=3.7V
VOLmax=0.2V
VOHmin=2.8V
PCM_OUT
26
O
3.3.2.5
General Purpose I/O and ADC
Signal Name
Pin No
2,4,12,
14,16,
33, 35,
37, 39
I/O
Signal level
O/P : VOLmax=0.2V
VOHmin=2.8V
Comments
GPIO 1 - 9
I or O
I/P : VILmax=0.8V
VIHmin=2.1V
VIHmax=3.7V
Range 0 – 1.8V
AIO_0, AIO_1
1, 3
I
3.3.2.6
Miscellaneous
Function
Signal Name
Pin No
I/O
Signal level
Comments
VILmax =0.3vdd_usb
VIHmin =0.7vdd_usb
Reserved
USB D-
32
34
13
I
Normally inactive.
Pull to GND
through 10K
VILmax =0.3vdd_usb
VIHmin =0.7vdd_usb
Reserved
USB D+
RESET
I
I
Normally inactive.
Pull to GND
through 10K
Threshold 2.6V
Reset
Active HIGH
Terminology:
USB Signal Levels. vdd_usb refers to the internal voltage generated by the LDO regulator on the
module, which is typically 3.3V. Hence 0.3vdd_usb and 0.7vdd_usb correspond to 1.0V to 2.3V. If
Vcc falls below the recommended minimum of 3.6V, these values will be reduced.
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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 3.6 to 7.0 at Vcc. Tests have
shown that there is no significant difference in current draw when Vcc is 5 or 6V. Therefore the data
presented below, pertains to Vcc levels of 3.6 and 5v only. Tests have shown that where power drain
is an issue, it is best to keep Vcc at the lower end of the range.
The UART baudrate has a bearing on power drain because as is normal for digital electronics, the
power requirements increase linearly with increasing clocking frequencies. Hence higher baudrates
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 between no data being transferred and when data is being transferred at the maximum
rate possible. The AT command Set document describes how to configure the Module for optimal
power performance.
4.1.1
Typical Current Consumption in mA
Baudrate
38,400 115,200
9,600
460,800
3.00
Idle Mode, S512=1
3.6v
5.0v
3.6v
5.0v
1.60
1.80
1.96
2.00
2.10
2.30
3.40
Wait for Connection Or Discoverable Mode,
AT+BTP
59.00
65.00
59.00
65.00
59.00
65.00
59.00
65.00
S508=S510=640, S509=S511=320
Wait for Connection Or Discoverable Mode,
AT+BTP
3.6v
5.0v
2.75
3.26
2.94
3.36
3.10
3.55
4.12
4.63
S508=S510=1000, S509=S511=11*
Inquiring Mode, AT+BTI
3.6v
5.0v
3.6v
5.0v
3.6v
5.0v
3.6v
5.0v
50.00
54.00
50.00
54.00
6.00
50.00
54.00
50.00
54.00
6.10
50.00
54.00
50.00
54.00
6.40
50.00
54.00
50.00
54.00
7.20
Connecting Mode (ATDxxx)
Connected Mode (No Data Transfer)
Connected Mode (Max Data Transfer)
7.20
7.20
7.40
8.20
21.50
24.50
22.50
26.00
24.50
28.00
32.50
36.00
Notes: These figures were obtained with pre-production firmware. Production values will typically be
20% lower.
* Calculated figures
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5. DC Characteristics
5.1 RF Performance
5.1.1
Transmit Power
Conducted Transmit Power
Antenna Gain
min: 1.0mW (0dBm)
+2dBi typ.
max: 4mW (6dBm)
Max: +6dBm
Effective Transmit Power
min:0dBm
Output power can be reduced by program control
5.1.2
Receive Sensitivity
Receive Sensitivity
Antenna Gain
-86dBm (at 25°C)
+2dBi typ
Effective Receive Sensitivity
-88dBm (at 25°C)
5.1.3
RF Performance Data
Receive Sensitivity
0
-40 deg
-20 deg
0 deg
20 deg
40 deg
60 deg
80 deg
100 deg
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
NOTE: Measured as attenuation required
to achieve better than 0.1% BER
Temperature Deg. C.
5.2 Range
See the Data Transfer Rate vs. distance graph below. The data throughput of the Module is limited to
280Kbps by the parsing of the data being transferred through the RFCOMM stack. The graph below
shows the typical data throughput. Distances are measured in free space between 2 Modules.
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Data Transfer Rate / Distance
800
700
600
500
400
300
200
100
0
RF data rate
Serial port data rate
10m
50m
100m
150m
200m
250m
300m
Distance (meters)
5.3 Temperature Performance
Data Transmit Rate with Temperature and Attenuation
800
700
600
500
400
300
200
100
0
-40 deg
-20 deg
0 deg
20 deg
40 deg
60 deg
80 deg
100 deg
-60dBm
-65dBm
-70dBm
-75dBm
-80dBm
-85dBm
-90dBm
dBm attenuation
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6. Functional Description
The BISM2 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-band 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 BISM2 module to be used for a wide
number of short range wireless applications, from simple cable replacement to complex multipoint
applications, where multiple radio links are active at the same time.
The complexity and flexibility of configuration are made simple for the design engineer by the
integration of a 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”.
To provide the widest scope for integration a range of different physical host interfaces are provided:
6.1 Interfaces
6.1.1
UART interface
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 3.3V and are inverted with
respect to the signalling on an RS232 cable. The interface is programmable over a variety of bit
rates; no, even or odd parity; stop bit and hardware flow control. The default condition on power-up
is pre-assigned in the external Flash. Two-way hardware flow control is implemented by 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 be continuously polled to detect
incoming communication. The UART_RI signal serves to indicate incoming calls.
UART_DSR is an active low input. It should be 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 be asserted by the host
to ensure connection is maintained. A de-assertion is taken to mean that the connection should be
dropped, or an online command mode is being 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
Serial Module
UART_TX
Application
/RXD
UART_RX
/TXD
/RTS
/CTS
/DTR
/DSR
/RING
UART_CTS
UART_RTS
UART_DSR
UART_DTR
UART_RI
UART_DCD
/DCD
Figure 6.1 : UART interfaces
Note that the serial module output is at 3.3V CMOS logic levels. Level conversion must be added to
interface with an RS-232 level compliant interface.
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6.1.2
SPI bus
The Module is a slave device that uses terminals SPI_MOSI, SPI_MISO, SPI_CLK and SPI_CSB. This
interface is used for program firmware updates at the factory.
Ezurio supply a PC based utility to allow firmware upgrade over the UART port. It is highly
recommended that customers should use this method for updating firmware.
Note: The designer should be aware that no security protection is built into the hardware or firmware
associated with this port, so the terminals should not be permanently connected in a PC application.
6.1.3
GPIO Port
Eight lines of programmable bi-directional input/outputs (I/O) are provided that can be accessed
either via the UART port, or Over The Air (OTA) from a second Bluetooth unit. These can be used as
data inputs or to control external equipment. By using these in OTA mode, a BISM module can be
used for control and data acquisition without the need for any additional host processor.
Each of the GPIO[1:8] ports can be independently configured to be either an Input or Output. A
selection of ports can be accessed synchronously.
GPIO 1 and 2 can be configured as event counters.
The ports are powered from VCC. The mode of these lines can be configured and the lines are
accessed via S Registers 621 to 628.
Low latency I/O can be accessed by using Ezurio’s I/O via an enhanced inquiry process.
6.1.4
PCM CODEC Interface
PCM_OUT, PCM_IN, PCM_CLK and PCM_SYNC carry up to three bi-directional channels of voice data,
each at 8ksamples/s. The format of the PCM samples can be 8-bit A-law, 8-bit µ-law, 13-bit linear or
16-bit linear. The PCM_CLK and PCM_SYNC terminals can be configured as inputs or outputs,
depending on whether the module is the Master or Slave of the PCM interface. Please contact an
Ezurio FAE for further details.
The Module is compatible with the Motorola SSI TM interface and interfaces directly to PCM audio
devices including the following:
6.1.4.1
Compatible Codec Chips
•
•
•
Winbond W61360 13-bit linear CODEC (Motorola MC145483 compatible)
OKI MSM7702 single channel A-law and µ-law CODEC
OKI MSM7705 four channel A-law and µ-law CODEC
The default codec support is for the Winbond W61360
Codec development boards that mate with the EZURiO Wireless Developers Kit are available for each
of the three codecs listed above.
6.1.5
ADC
The BISM2 provides access to two 8-bit ADCs. These provide an input range of 0mV to 1,800mV,
which can be read using the S registers 701 and 702.
Suitable external scaling and over-voltage protection should be incorporated in your design. The
module provides 5 samples per second at the UART with a baud rate of 115200 or above.
Low latency access of the upper 6 bits of the ADCs can be obtained by using Ezurio’s I/O via an
enhanced inquiry process.
6.1.6
LED
A single LED provides information on the status of the module. It is controlled by a S register to
display the status of various parameters and is useful for debug and test.
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7. Integrated Firmware
7.1 General
The BISM2 has been designed to provide the fastest route to market for designers who wish to use
Bluetooth to wirelessly enable 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 be controlled by means of a simple
set of commands.
For applications where multiple concurrent live connections need to be maintained a variant of
firmware is available which is specifically targeted at multipoint operation.
For both applications a comprehensive range of windows based software is available to speed up the
design process. A low cost development kit is also available that can be used for prototyping both
cable replacement and multipoint applications.
7.2 Profiles
Bluetooth has been designed to accommodate a very wide range of wireless applications. To enable
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 basic functions. These provide a base line of interoperability for specific application
scenarios, upon which more complex user applications can be developed.
There are over 30 different profiles, many of which have been developed for specific applications.
The BISM2 firmware is provided with support for the profiles that are most commonly required for
cable replacement applications.
The current profiles support includes:
•
•
GAP
SDP
Generic Access Profile. The base connection profile upon which others are based.
Service Discovery Profile. The profile to find other Bluetooth devices and the services
they support.
•
•
SPP
Serial Port Profile. Emulation of a serial cable for cable replacement applications.
DUN
Dial Up Networking. Profile support for connection to an external PSTN, GSM, GPRS
or VPN connection.
•
•
Audio Gateway. The base element for Headset and Handsfree profile. A portion of these
profiles must be implemented within the host system.
HSP
Headset Profile. Supports early implementations of headsets. Now largely replaced
by the:
•
•
HFP
FTP
Hands-free profile, which provide more control over the headset operation.
File Transfer Profile (full client support).
For other profile support, please contact Ezurio Ltd at [email protected]
7.3 AT Overview
The AT command set is well known by engineers and was developed to aid the integration of PSTN
modems. It provides simple high level commands for complex functions that can easily be
incorporated into programs or used within programming scripts.
Ezurio has used this familiar concept and extended it to Bluetooth to simplify the integration of
Bluetooth for product designers. Rather than having to understand the many stages of setting up a
Bluetooth connection or function, a single AT command is all that is required.
For example to connect to a Bluetooth device with an address 00809844EA13, all that is needed is to
send the string
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ATD00809844EA13
to the UART of the BISM2 module. The module will attempt to make a connection and return connect
00809844ea13,1101) or (NO CARRIER), depending on whether the connection was successful.
The scope of the AT command set developed by Ezurio is such that most Bluetooth functionality can
be covered, greatly reducing development time.
To provide additional functionality a range of “S” registers has been implemented. These allow
program settings to be stored to control the BISM2 function and also give access to configuring and
reading ports and status registers within the BISM2.
Full details of the AT command set are provided in the Blu2i AT Command Reference Manual.
7.3.1
AT features at a glance
7.3.1.1
General
•
Configure two modules to automatically connect and transfer data, audio or a combination of
data and audio when both devices are powered. The peer device does not have to be another
Intelligent Serial Module. It is possible to implement auto connect with a Bluetooth enabled
mobile phone.
•
•
Automatically re-connect devices when a connection is dropped.
Remotely access the AT parser of the remote unit from a master device to perform Over The
Air (OTA) configuration.
•
Configure the module to enter a state on power up and after a period of time change to
another state automatically. This allows units to be placed in the discoverable state for a
limited time period.
•
•
•
Read and write to GPIO lines
Read the ADC channels
Get fast GPIO and ADC status through an inquiry response (patent pending)
7.3.1.2
Audio
•
Set up audio connections
•
Enable / disable Auto Answer for incoming connections
7.3.1.3
UART
•
•
•
•
•
•
Change the baud rate from 1200 to 921,600 baud.
Use the DSR line to drop connections
Flexible configuration as either DTE or DCE
Change escape sequence character
Change the number of Stop bits and Parity
Enable or disable echoes
7.3.1.4
Security
•
Enable Authentication by requiring a PIN code for incoming AND / OR outgoing connections
•
Enable data to be encrypted over the air for incoming AND / OR outgoing connections. The
module can be configured to be:
non-connectable and non-discoverable,
non-connectable but discoverable,
connectable but non-discoverable,
connectable and discoverable.
•
Automatically store Paired devices in a trusted device database in the flash memory
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7.3.1.5
Bluetooth
•
•
•
•
•
•
•
•
•
•
•
Set the module to be a master or slave
Make a Bluetooth connection to a specified device
Perform a full inquiry for other Bluetooth devices
Query a remote device to check if a service is offered
Fetch the friendly name of a remote device
Increase or decrease the delay before the master abandons a connection attempt
Change the device class code
Set the device’s friendly name
Change the Inquiry scan time
Change number of returned devices from an inquiry scan
Obtain the RSSI value for a connection
7.3.1.6
Power Management
•
Decrease or increase the output power to suit your connection range
Configure the modules to work in Sniff and other low power modes.
•
7.4 Multipoint Firmware
For multipoint operation, the same hardware can be loaded with multipoint software. Whereas the
firmware for single point ‘AT’ communication only allows one connection to be active at any one time,
using multipoint firmware allows a number of simultaneous connections to be made and maintained.
It also allows connections to multiple profiles to one or more devices. Multipoint firmware should be
seen as a concept of channels instead of slave connections.
When operating in Bluetooth multipoint mode, the resources and bandwidth of a Bluetooth master
device are shared amongst the different connected devices. This has an impact on the maximum
throughput to any one device. If multiple device connections are maintained it also impacts on the
memory resources and device database within the Bluetooth stack. Designers should be aware of
these restrictions when using multipoint configurations. In most cases better latency and power
consumption can be achieved by polling or fast data transfer rather than by maintaining concurrent
connections.
In general, multipoint connections are viable for up to three connections, but other connection
schemes become appropriate if a greater number of devices are being deployed.
7.5 OTA (Over the Air) Configuration
When the BISM2 has its remote AT parser enabled, its settings can be remotely controlled by a
master unit (see register S536). This places the slave unit’s AT parser in remote mode providing
over the air configuration. This mode is of use for remote sensor applications, where no host
processor is required to control the slave Bluetooth unit.
7.6 Boot modes
The module has the capability of booting into 1 of 7 modes. Currently only Boot Mode 1 is supported.
Boot Mode 1 is default and gives functionality equivalent to the BISM1 module.
These modes will specify different PSKEY settings to allow for different basic operation. Please
contact Ezurio for further information.
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8. Low Power Modes
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 baud rate and the operating mode.
The hardware specification for the blu2i module allows for a voltage range of 3.6 to 7.0v at Vcc. Tests
have shown that there is no significant difference in current draw when Vcc is 5 or 6V.
The UART baud rate has a bearing on power drain because as is normal for digital electronics, the
power requirements increase linearly with increasing clocking frequencies. Hence higher baud rates
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 and connected. With connected mode, it is also relevant to
differentiate between no data being transferred and when data is being transferred at the maximum
rate possible.
The operating mode can best be described by stating the AT commands required to enter that mode.
In addition, there are certain S Registers which have a direct impact on power consumption, which
are described next.
The blu2i Module has a single LED which can be configured to display connection status. Tests have
shown that this LED can consume up to 5.3mA which is more than double the current draw when in
Idle mode. S Register 534 can be used to completely disable this indicator.
S Registers 508 to 511, which specify the page and inquiry scan intervals and windows, can be used
to adjust the average current drain when in discoverable and or connectable modes. Registers 508
and 509 specify the interval and window for page scans and registers 510 and 511 specify the
interval and window for inquiry scans. Register pairs 508/509 and 510/511 describe duty cycles when
the blu2i module goes into scan modes. It is while scanning that the highest current draw occurs. The
average current draw is determined by simple arithmetic using the values stored in the 508/509 and
510/511 register pairs.
Typical current consumption is given in Section 4.1.
The current drain while waiting for a connection or discoverable mode is about 30 times higher than
in idle mode. This is when the page/inquiry scan duty cycle is 100%. These modes give the quickest
response to a page or inquiry request from a remote peer.
It is possible to reduce the duty cycle down to as low as 0.5% at the expense of response time. The
response time can be specified via S Registers 508 and 510 for page and inquiry respectively, where
the worst case response time can be as high as 2.5 seconds. Then the duty cycle can be varied by
changing the value of S Registers 509 and 511 appropriately.
For example, if S Register 508 and 510 are both set to 1000ms and S Register 509 and 511 are both
set to 11ms then the duty cycle is reduced to 1%, this means that average current drain at 5.0v will
be 2% of 65mA plus the normal idle mode current, that is, it is as low as 2.75mA. However, in this
case, it can take up to 1 second to establish a connection.
The connected state current consumption while a master or slave can be considerably reduced by
enabling Sniff mode, described in detail in the next section.
mA
Current per LED (when fitted)
3.6V
5.0V
3.20
5.30
8.1 Low Power Modes using Sniff
Bluetooth connections are master/slave in nature. A master sends packets and a slave has to
acknowledge that packet in the next timeslot. Timeslots in Bluetooth are 625 microseconds wide. This
implies that a master will always know when packets will be sent and received, which further means it
is able to optimise power usage by switching on power hungry circuitry only when needed.
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A slave on the other hand does NOT have prior knowledge of when a packet will be received and has
to assume that a packet will be received from a master on every receive slot. This means that it has
to leave its receiving circuitry on for most of the receive slot duration. The result of this is high power
consumption as illustrated in the power table in Section 4.1, where a slave with no data transmission
still consumes around 31mA whereas a master consumes only 6mA.
This problem was identified very early in the evolution of Bluetooth (especially since headsets spend
all their time as a slave in a Bluetooth connection) and it was solved by having a mode called Sniff,
with appropriate lower layer negotiating protocol.
Sniff mode during connection is basically an agreement between the slave and its master that data
packets will only be exchanged for N timeslots every M slots. The slave can then assume that it will
never be contacted during N-M slots, and so can switch its power hungry circuitry off. The
specification goes further by also specifying a third parameter called ‘timeout’ (T) which specifies
‘extra’ timeslots that the slave will agree to listen for after receiving a valid data packet. Put another
way, if a data packet is received by the slave, then it knows that it MUST carry on listening for at
least T more slots. If within that T slot time period another data packet is received, then the timer is
restarted. This mechanism ensures low power consumption when there is no data transfer – at the
expense of latency. When there is a lot of data to be transferred, it acts as if sniff mode were not
enabled.
It is stated above that during sniff mode, a slave listens for N slots every M slots. The Bluetooth
specification states that a master can have up to 7 slaves attached to it with all slaves having
requested varying sniff parameters. It may therefore be impossible to guarantee that each slave gets
the M parameter it requested. In light of this, the protocol for enabling sniff mode specifies that a
requesting peer specify the M parameter as a minimum and maximum value. This will allow the
master to interleave the sniff modes for all slaves attached.
For this reason, the sniff parameters are specified in the BISM2 module via four S registers. S
Register 561 is used to specify ‘N’, S Register 562 is used to specify ‘T’ and S Registers 563/564 are
used to specify minimum ‘M’ and maximum ‘M’ respectively. Although the specification defines these
parameters in terms of timeslots, the S register values have to be specified in units of milliseconds
and the firmware does the necessary translation to timeslots.
High Power Consumption
Low Power Consumption
T Slots
T Slots
T Slots
T Slots
T Slots
N Slots
N Slots
N Slots
M Slots (Negotiated)
M Slots (Negotiated)
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9. Application Examples
9.1 RS232 Modem Signals
Just as a telephony modem has control and status lines, the blu2i Module also provides for 6 control
and status lines as per the table below. The direction column is as seen from the module’s viewpoint.
Direction
IN or OUT *
IN or OUT *
IN
Function
CI also known as RI (Ring Indicate)
DCD (Data Carrier Detect)
DSR (Data Set ready)
OUT
DTR (Data Terminal Ready)
CTS (Clear to Send)
IN
OUT
RTS (Request to Send)
* configurable with S register 552
The first four lines are under program control. These use four of the GPIO pins and are mapped to
I/O as per the table below. The last two are under control of the UART driver and their functionality is
always enabled.
Direction
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN
Connector Pin Label
GPIO1
Function
General Purpose I/O
GPIO2
General Purpose I/O
UART_RI
Input/Output from module
Input/Output from module
Input to Module
UART_DCD
UART_DSR
GPIO3/UART_DTR
GPIO4/LED
GPIO5
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
General Purpose I/O (or DTR functionality)
General Purpose I/O (LED)
General Purpose I/O
GPIO6
General Purpose I/O
GPIO7
General Purpose I/O
GPIO8
General Purpose I/O
Notes:
1.
PIO4 (DSR) is used by the blu2i module to sense that the host is connected, and is intricately
linked with connections. For outgoing calls, if this line is not asserted then an error is indicated.
Similarly for AT+BTP and AT+BTG.
While in a call, for appropriate modes, a de-assertion means fall into command state. If the de-
assertion exists for longer than the period specified in S Register 519 then the connection is dropped
as if an ATH command was received.
2.
PIO2 (RI), is normally de-asserted. When an incoming connection is detected it will be
asserted, until the connection is either answered or rejected using ATA and ATH respectively. See S
Registers 552 & 553 for more details
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3.
PIO3 (DCD) will be de-asserted when the device is in the unconnected state. Asserted when a
connection is active. See S Registers 552 and 553 for more details.
4. PIO5 is either used as GPIO or driven as UART_DTR. When the unit is configured in pure host
mode, this pin is forced into UART_DTR and is asserted when there is a Bluetooth connection.
GPIO Pins 1 to 8 are available for general purpose use.
9.2 Modem signalling over Bluetooth
The RFCOMM protocol used in Bluetooth for implementing the serial port profile allows for the
exchange of four modem signals. This information is contained in a special transparent message
which contains bits identified as RTR, RTC, DV and IC which depending on the type of serial device
being emulated maps to DTR or DSR, RTS, DCD and RI respectively. In addition, this message also
includes the ability to convey a BREAK input from one end to the other.
To allow for the greatest flexibility and variability in how the modem control signals are used out in
the real world, S Registers 551, 552 and 553 have been provided which allow for any of RTR,RTC,DV
and IC to be mapped to any modem control/status line.
BREAK signal on RX line
If the host sends a break signal of duration greater than 100ms, then the blu2i module is
configured to treat that as a signal to perform a hardware reset.
This being the case it is not possible to convey a BREAK over Bluetooth to the peer device.
Reset
The module can be reset by the host without the need of any I/O using a BREAK signal. The
module has been configured to reset when the RX line detects a break condition for durations
greater than 100 milliseconds.
The Reset line has a fixed pull down resistor of 10kOhm
9.3 Pure Cable Replacement Mode
The module has the capability of being preset into a pure 5-wire data cable replacement mode. The 5
wires being RX, TX, CTS, RTS and GND. This mode requires no changes to a host application since the
Bluetooth connection is automatically set up on power up. If the connection is lost the BISM2 module
will constantly retry until the connection is reinstated.
By implication, two devices are needed to replace a cable. One device is pre-configured to always be
a master and the other, a slave.
Assuming the Bluetooth address of the master to be <bdaddr_m> and that of the slave to be
<bdaddr_s>, the master module is configured by sending it the following AT commands:
AT&F*
ATS512=1
ATS504=1
ATS507=2
ATS530=2000
AT&W
AT+BTR<bdaddr_s>
The ATS507=2 setting puts the device in DSR drop mode only. This means that when the device
needs to be reconfigured, deasserting the DSR line will ensure that the module responds quickly to AT
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commands. This further means that in stand alone mode, the DSR input line MUST be asserted e.g.
0V in TTL signal mode.
The slave is configured by:
AT&F*
ATS512=4
ATS0=-1
AT&W
AT+BTR<bdaddr_m>
Where <bdaddr_m> is optional. If it is not specified, then the slave unit will accept connections from
any device. If specified then only connections from the device specified will be accepted.
If it is desired that the slave unit should not be discoverable (the master is by default not
discoverable), then the configuration commands are:
AT&F*
ATS512=3
ATS0=-1
AT&W
AT+BTR<bdaddr_m>
Where <bdaddr_m> is optional. If it is not specified, then the slave unit will accept connections from
any device. If specified then only connections from the device specified will be accepted.
When the units are next power cycled, the slave unit will wait for the master to connect to it and the
master will continually look for the slave. If a connection attempt fails, the master will wait for 2
seconds before reattempting a connection. This 2 second delay can be varied by issuing it an ATS530
command with an appropriate value in the range 100ms to 15000ms.
IMPORTANT NOTE: The DSR input to the module MUST be asserted for the auto connection to
succeed. When operating at TTL levels a 0V is seen as an assert state. When operating at RS232
levels and voltage greater than 3V is seen as assert. It is usual to connect the DTR line of the host to
the DSR line of this device.
9.4 Audio Cable (voice)
With a pair of these modules it is possible to replace a mono audio cable with two way traffic. That is,
a setup where a microphone is connected to a speaker at the remote end and vice versa. So this
mode effectively replaces two audio cables.
Assuming the Bluetooth address of the master to be <bdaddr_m> and that of the slave to be
<bdaddr_s>, the master module is configured by sending it the following AT commands:
AT&F*
ATS512=1
ATS504=1
ATS530=2000
ATS532=7
AT&W
AT+BTR<bdaddr_s>
And the slave is configured by:
AT&F*
ATS512=4
ATS0=-1
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AT&W
AT+BTR<bdaddr_m>
9.5 Modem Control and Status Signals
A serial port has DTR, DSR, RTS, CTS, DCD and RI control lines. RTS and CTS are locally controlled to
prevent local buffer overflow.
The status of DTR, DRS, DCD and RI can be exchanged with the remote peer device. If for example,
the DTR/DSR lines are to be exchanged between the two peers to simulate the performance of a
physical cable, then it is possible to do so. Refer to the description for S Registers 551, 552 and 553
for more details.
Some serial implementations link CTS and RTS to remove the need for handshaking. Ezurio do not
recommend linking CTS and RTS other than for testing and prototyping. If these pins are linked and
the host sends data at the point that the Bluetooth Serial Module deasserts its RTS signal, then there
is a significant risk that internal receive buffers will overflow which could lead to an internal processor
crash. This will lead to a drop in connection and may require a power cycle to reset the module.
Ezurio recommend that the correct CTS/RTS handshaking protocol be adhered to for proper
operation.
9.6 Oscillator Output
The output from the high performance crystal oscillator (+ 10ppm) can be divided and output on one
of the selected PIO lines, removing the need for a crystal on the customer’s main pcb. The
frequencies available are:
•
•
•
•
8 MHz
16 MHz
24 MHz
48 MHz
For more implementation details, please contact Ezurio’s FAE team.
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10. Application Information
10.1
Antenna Position
The antenna used on the BISM2 Bluetooth module is designed to be largely immune from the effects
of proximity detuning. Normally, antennas operating at 2.4GHz are affected by their surroundings, so
that great care is needed in their placement and orientation.
The BISM2 can be used in most locations and orientations and is only marginally affected by the
presence of a significant ground plane in close proximity.
The antenna distribution is close to isotropic, which means that the orientation of mounting has only a
limited effect on the overall range. However the optimum range is achieved when the two antennae
are directly facing each other
Example of Radiation Characteristics
Horizontal Polarisation
Vertical Polarisation
Typical Radiation Characteristics. Measured at 2.5metres from a standard dipole.
The module should not be located in a sealed metal enclosure, as this will act as a Faraday cage and
severely attenuate the radio signal.
The antenna finish may tarnish as a result of environmental effects and handling. This is a cosmetic
effect and does not affect the RF performance.
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10.2
Sumber Kuasa Considerations
The power supply for the Module has to be a single voltage source of Vcc within the range of 3.6 V to
7.0 V. It must be able to provide sufficient current in a transmit burst. This can rise to 65mA.
The Module includes regulators to provide local 3.3V. This rail is accessible on connector J2 for
monitoring purposes only. Under no circumstances should this pin be used to source current.
Power (Vcc) can be provided via the board-to-board connector Pin 29 on J2.
10.3
Power-On-Reset (Power Cycling and Brown Out
considerations).
The Module is provided with an active high reset pin (Hirose 40way DF12C connector pin 13). Upon
the application of power, the Power On Reset circuit built into the Module will ensure that the unit
starts correctly. There is no need for an external power reset monitor.
Note: The previous version of the Bluetooth Serial Module required an external Brown Out circuit to
ensure correct operation. This circuitry has now been incorporated into the module. The power
supply has been designed to work with previous versions of customer circuitry that may or may not
have external brown-out implementations. Customers migrating from a BISM1 to BISM2 module may
be able to simplify their power supply circuitry as a result..
10.4
RF Shield
To meet FCC requirements, all modules are supplied with a soldered RF shield. This meets the
requirement that users may not be able to access RF circuitry without special tools. Removal of the
shield may negate RF approvals.
10.5
Mounting the Module onto the application platform
There are many ways to properly install the Module in the host device. An efficient approach is to
mount the PCB to a frame, plate, rack or chassis. Fasteners can be M1.8 or M2 screws plus suitable
washers, circuit board spacers, or customized screws, clamps, or brackets in 2.2mm diameter holes.
Note that care should be taken to ensure the head of the fixing does not interfere with the circuit.
Nylon fixings are recommended. In addition, the board-to-board connection can also be utilized to
achieve better support.
The antenna (Brown square component on top side of PCB) must not be influenced by any other
PCBs, components or by the housing of the host device. The proximity of the antenna to large
metallic objects can affect the range and performance of the system. Designers should carefully
consider the location of the Module and the type of enclosure material that is used.
To prevent mechanical damage, be careful not to force, bend or twist the Module. Be sure it is
positioned flat against the host device.
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10.5.1 Fixing Pillars
Ezurio in conjunction with Richco has designed a mounting pillar for use with the Bluetooth Serial
Module. This allows the module to be securely held to a primary pcb using snap fit details. A variety
of different heights are available to accommodate different variants of Hirose stacked connectors.
Pillars supporting a 3.5mm stacked board height can be supplied by Ezurio. These and alternative
spacings can also be ordered directly from Richco.
Customer designs using these pillars should use 2.5mm diameter holes on a 1.6mm thick PCB. in
conjunction with the 3.6 mm stacked height Hirose if they are to take advantage of this.
Board Spacing
Part number
Source
Matching HRS PCB
Socket
3.6 mm
NPR2005-153-3.6
Ezurio / Richco
CL537-0032-4-86
4.1 mm
5.1 mm
NPR2005-153-4.1
NPR2005-153-5.1
Richco
Richco
CL537-0057-5-86
CL537-0157-0-86
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11. Board to Board Connector
This chapter provides specifications for the 40-pin board-to-board connector which serves as physical
interface to the host application. The receptacle assembled on the Module is Hirose type DF12C.
11.1
Stacking Height
Mating headers from Hirose are available in different stacking heights, allowing the spacing between
the BISM2 and carrier pcb to be changed from 3.5mm to 5.0mm.
Item
Part number
Stacking height
HRS number
Receptacle on
Module
DF12C-40DS-0.5V(86)
3.5 mm – 5 mm
CL537-0007-7-86
Headers DF12 series
DF12(3.5)-40DP-0.5V(86)
DF12(4.0)-40DP-0.5V(86)
DF12(5.0)-40DP-0.5V(86)
3.5 mm
4.0 mm
5.0 mm
CL537-0032-4-86
CL537-0057-5-86
CL537-0157-0-86
Notes: The headers listed above are with boss and metal fitting.
Suffix -86 denotes RoHS compliance.
11.2
Hirose Connector general specification
Parameter
Specification (40 pin Board to Board connector)
Number of Contacts
Quantity delivered
Voltage
40
2000 Connectors per Tape & Reel
50V
Current Rating
0.5A max per contact
0.05 Ohm per contact
500V RMS min
Resistance
Dielectric Withstanding Voltage
Operating Temperature
Contact Material
-45°C...+125°C
phosphor bronze (surface: gold plated)
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Insulator
Material PA , beige natural
Stacking height
Insertion force
3.0 mm ; 3.5 mm ; 4.0 mm ; 5.0 mm
21.8N
10N
Withdrawal force 1st
Withdrawal force 50th
10N
Maximum connection cycles
50
12. Qualification
12.1
Bluetooth Qualification Process
The following safety precautions must be observed during all phases of the operation, usage, service
or repair of any application incorporating this Module. Manufacturers of the RF equipment are advised
to convey the following safety information to users and operating personnel and to incorporate these
guidelines into all manuals supplied with the product. Failure to comply with these precautions
violates safety standards of design, manufacture and intended use of the product. Ezurio assumes no
liability for customer failure to comply with these precautions.
12.2
Safety Information:
Switch off the Bluetooth device before boarding an aircraft. Make sure it cannot be switched on
inadvertently. The operation of wireless appliances in an aircraft is forbidden by many airlines to
prevent interference with communications systems. Applications that could result in use on aircraft
should carry appropriate warnings.
12.3
Qualifications
12.3.1 RF approvals
The Module is listed as a Bluetooth Product in terms of the Bluetooth SIG Program Reference
Document (PRD). This means that it can be integrated into end products without further testing or
approval listing. The manufacturer must state the Ezurio part number and product reference in his
literature in order to meet the requirements of the Bluetooth and regulatory approvals.
A list of the countries where the Module is approved will be provided by Ezurio as required. As a
minimum the product is listed in Europe, Scandinavia and USA. Ezurio assumes no liability for
customer failure to comply with national RF approvals.
12.3.1.1
EMC Emissions
EN 300 328 V1.5.1 (2004-08)
12.3.1.2
EMC Immunity
EN 301 489-1 V1.4.1 (2002-08)
12.3.1.3
FCC
FCC Part 15.247:2004 (Subpart C)
FCC ID: PI401B
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12.4
Safety and Regulatory Statements
12.4.1 Europe – EU Declaration of Conformity
DECLARATION OF CONFORMITY
In accordance with Annex IV of the EU directive 1999/5/EC
Ezurio declare under our responsibility that the BISM2 Module
complies with the appropriate essential requirements of the Article 3 of
the R&TTE and the other relevant provisions, when used for its intended
purpose.
Health and Safety requirements contained in Article 3 (1) a)
EN 60 950: 1992 Safety of information technology equipment +
Amendment A1:1993, Amendment A2:1993, Amendment A3:1995,
Amendment A4:1997, Amendment A11:1997
EN 50371: Generic standard to demonstrate the compliance of low-power
electronic and electrical apparatus with the basic restrictions related to
human exposure to electromagnetic fields (10 MHz - 300 GHz) – General
public
Protection requirements with respect to electromagnetic compatibility
Art.3 (1) b)
EN 301 489-1 V1.4.1 (2002-08), Electromagnetic Compatibility and
radio spectrum Matters (ERM); Electro Magnetic Compatibility (EMC)
standard for radio equipment and services; Part 17: Specific
conditions for wideband data HiperLAN equipment
Means of the efficient use of the radio frequency spectrum
EN 300 328 V1.5.1 (2004-08), Radio Equipment and Systems (RES);
Wideband transmission systems; Technical characteristics and test
conditions for data transmission equipment operating in the 2,4 GHz
ISM band and using spread spectrum modulation techniques. Part 2:
Harmonized EN covering essential requirements under article 3(2) of
the R&TTE directive.
Ezurio Ltd
Saturn House, Mercury Park
tel: +44 (0) 1628 858 940
Registered in England
No. 5178293
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12.4.2 FCC and Industry Canada 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.
12.4.2.1
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:
PI401B” or “Contains FCC ID: PI401B.” Any similar wording that expresses the same meaning may be
used.
13. Environmental
13.1
Operating temperatures
Parameter
Min
Typ
Max
Unit
Operating temp (standard product)
-40
25
+85
°C
13.2
Storage temperature
Parameter
Min
Max
Unit
°C
Storage temp
-40
+125
13.3
Reliability
Parameter
Thermal Shock
Vibration
Test
Comment
200 cycles -40ºC /+85ºC 30 min
1 cycle/hour
Continuous operation at 60 Hz,
2mm stroke
15g max sine wave, 12 hours
Shock
50G 11ms Half Sine Wave
6 axis x 3 cycles each axis
Moisture Resistance
High Temp Storage
Low Temp Storage
85ºC, 360 hours
-40ºC, 240 hours
High Temp/Humidity
Operation
60ºC, 90%RH, 360 hours
Thermal shock
-40 to 60ºC in 30min
200 cycles with continuous
operation
Electro Static Discharge
Drop Test
EN55024:1998 & IEC61000-4-3
75cm to concrete, 3 axis x 2
cycles per corner
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14. Physical Dimensions
14.1
Mechanical Dimensions
14.1.1 Standard Module
Location of Connector
(Bottom View)
All dimensions in mm
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14.2
BISM2 Module without antenna (special order)
The dimensions for this module are identical to the standard BISM2 illustrated above, but the antenna
is replaced with a U-FL connector.
TOP VIEW
The external antenna used must not result in an increased output power. I.e. the total gain of mating
connector, cable and antenna must not exceed +2dB. If a higher gain antenna is connected, it will
invalidate the RF and Bluetooth approvals for the module. The external antenna must provide a 50
Ohm impedance.
The antenna connector is a U.FL connector, supplied by Hirose. Mating connectors with cables are
available from Hirose and their distributors, and also from other cable suppliers. The data sheet for
the connector series is available at http://www.hirose.co.jp/cataloge_hp/e32119372.pdf
14.2.1 External Antennae
A variety of manufacturers can supply external antennae suitable for use with the BISM2 module
without antenna. Users should be aware that the choice of antenna may affect the qualification of the
module.
To ensure that the qualification is not affected, the TOTAL GAIN of the external antenna, including
insertion loss of the connectors and cable must be less than 2dBi. If a higher gain is employed, then
the pre-qualified status of the module will be lost. It is the customer’s responsibility to ensure that
an external antenna does not negate the qualification.
in external connector of the form generally known as
a “rubber duck” with a 100mm captive lead
terminated in a U.FL connector that is particularly
appropriate for use with the BISM2 module.
The part number is WCR 2400-IP
rubber duck antenna with U.FL connection.
The ordering information is W-154C 2dB Wireless
LAN Antenna (2.4GHz) Assembled with U.FL (iPX)
Connector.
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manufacture a wide range of antennae, including
their planTEc roof antennae that are ideal for vehicle
mounting.
Part Number M70CXR 0300 00 XX XX
(Contact Reel for availability of a U.FL connection
and exact part number)
wide range of antennae, including high gain
antennae. Although these will require
requalification, they may be appropriate for longer
range applications. The RooTenna is a good solution
for IP65 applications.
U.FL to SMA adaptors / pigtails
Other antennas can be used with a pigtail that goes
from the U.FL connection on the BISM2 to the
appropriate antenna connection, moat commonly a
reverse SMA. These are available from a variety of
sources, a good range is supplied by:
High volume quantities can be obtained from Hirose.
When connecting to SMA antennae, please check
whether your antenna is a normal or reverse thread.
14.3
BISM1 Compatible Module (special order)
The BISM1 Compatible format version of the BISM2 Bluetooth Serial Module, preserves all of the
mechanical mounting detail and dimensions of the earlier module design.
This is a special order module for customers who are currently in production with the BISM1, but want
to migrate to the additional features of the BISM2. It is not recommended for new designs.
TOP VIEW
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SIDE VIEW
All dimensions in mm.
14.4
Labelling
The label contains the Part number and the unique Bluetooth address of the module.
14.5
Ordering Information
The BISM2 is available with different variants of engineering or production firmware. Ordering
information is provided below:
Part Number
Description
Firmware Version
TRBLU23-00200
BISM2 with integrated ceramic antenna and
standard AT firmware
Version 7.18.0
The following parts are available to special order. Please contact your Ezurio representative:
Part Number
Description
Firmware Version
TRBLU23-002MP BISM2 with integrated ceramic antenna and
Version 5.13.ES
standard Multipoint firmware
TRBLU23-002HC BISM2 with integrated ceramic antenna and
Version 00056-01
Version 2.11.0
standard HCI firmware
TRBLU23-00300
BISM2 with U.FL jack and standard AT
firmware
TRBLU23-003MP BISM2 with U.FL jack and standard Multipoint Version 5.13.ES
firmware
TRBLU23-003HC BISM2 with U.FL jack and standard HCI
Version 00056-01
firmware
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15. Related Documents
•
•
•
•
•
•
•
•
•
•
blu2i AT Command Set Version 2.11.0 Reference Manual
blu2i Firmware Release Notes Version 2.11.0
blu2i Multipoint Firmware Reference Manual
BISM Bluetooth Serial Module - Quick Start Guide
BISM Bluetooth Serial Module - FAQ
Blu2i Application Scenarios
Wireless Developer’s Kit User Guide
ACC-005 Winbond W61360 Audio Codec Board Manual
ACC-006 OKI 7702 Audio Codec Board Manual
Bluetooth Core 2.0 Specification – www.bluetooth.org
16. Differences from previous modules
The BISM2 has been designed to be a drop in replacement for previous BISM modules from TDK
Systems and Ezurio. However, some additional features have been made. This section lists all of
these changes. More details can be found in the relevant section of the data sheet.
Significant additions have been made to the AT command set.
Pin 27 is now marked as RESERVED instead of VCC_3V3. It can no longer be relied to provide a 3.3v
regulated output.
Pins 33, 35 & 37 are now GPIO instead of N/C. The default state is configured as an inputs.
Pin 39 is now allocated as GPIO9 which defaults as an input line instead of a “VCC_1V8” monitor.
This change has been made to increase the I/O capability and to prevent noise being injected onto
the 1V8 rail.
The module is physically smaller so the fixing holes no longer align with those of the previous module.
A brown-out circuit is now incorporated on the module. Reset functionality remains the same.
The Oscillator output is now available.
17. Disclaimers
EZURIO’S BLUETOOTH PRODUCTS ARE NOT AUTHORISED FOR USE AS CRITICAL COMPONENTS IN
LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE
MANAGING DIRECTOR OF EZURIO LTD.
The definitions used herein are:
a) Life support devices or systems are devices which (1) are intended for surgical implant into the
body, or (2) support or sustain life and whose failure to perform when properly used in accordance
with the instructions for use provided in the labelling can reasonably be expected to result in a
significant injury to the user.
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b) A critical component is any component of a life support device or system whose failure to perform
can be reasonably expected to cause the failure of the life support device or system, or to affect its
safety or effectiveness.
Ezurio does not assume responsibility for use of any of the circuitry described, no circuit patent
licenses are implied and Ezurio reserves the right at any time to change without notice said circuitry
and specifications.
17.1
Data Sheet Status
Ezurio Ltd reserve the right to change the specification without notice in order to improve the design
and supply the best possible product.
Please check with Ezurio Ltd for the most recent data before initiating or completing a design.
Where reference is made to related products from other suppliers, Ezurio takes no responsibility for
the information, availability or performance of such products.
17.2
Warranty
Ezurio warrants that its products shall conform to Ezurio’s published specifications and remain free
from defects in materials and workmanship under normal, proper and intended use for a period of
two (2) years from date of purchase, provided that proof of purchase be furnished with any returned
equipment.
If during the warranty period any component part of the equipment becomes defective by reason of
material or workmanship, and Ezurio is immediately notified of such defect, Ezurio shall at its option
supply a replacement part or request return of equipment, freight prepaid, to its designated facility
for repair. In the event no trouble is found on products returned for repair, Ezurio reserves the right
to charge the customer its standard published repair charge.
This warranty shall not apply to any products that have been subject to misuse, bending, twisting,
neglect, alteration, improper installation, testing or unauthorized repair performed by anyone other
than a Ezurio designated repair facility. Any non-warranty repairs or maintenance shall be at Ezurio’s
standard rates in effect at the time.
This warranty is in lieu of all other warranties, whether expressed, implied, or statutory, including but
not limited to, implied warranties or merchantability and fitness for a particular purpose. In no event
shall Ezurio be liable, whether in contract, in part, or on any other basis, for any damage sustained by
its customers or any other person arising from or related to loss of use, failure or interruption in the
operation of any products, or delay in maintenance, or for incidental, consequential, in direct, or
special damages or liabilities, or for loss of revenue, loss of business, or other financial loss arising
out of or in connection with the sale, lease, maintenance, use, performance, failure, or interruption of
these products.
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