The SPBT2632C2A.AT2 is an easy to use Bluetooth module, compliant with Bluetooth v3.0.
The module is the smallest form factor available which provides a complete RF platform.
The SPBT2632C2A.AT2 enables electronic devices with wireless connectivity, not requiring
any RF experience or expertise for integration into the final product. The
SPBT2632C2A.AT2 module, being a certified solution, optimizes the time to market of the
final applications.
The module is designed for maximum performance in a minimal space including fast speed
UART and 7 general purpose I/O lines, several serial interface options, and up to 1.5 Mbps
data throughput.
Optimized design allows the integration of a complete working Bluetooth modem, including
antenna, in the minimum possible size; only an additional external LPO (low power
oscillator) is required to enable low power mode capability.
The SPBT2632C2A.AT2 is a surface mount PCB module that provides fully embedded,
ready to use Bluetooth wireless technology. The reprogrammable Flash memory contains
embedded firmware for serial cable replacement using the Bluetooth SPP profile.
Embedded Bluetooth AT2 command firmware is a friendly interface, which realizes a simple
control for cable replacement, enabling communication with most Bluetooth enabled
devices, provided that the devices support the SPP profile. The SPBT2632C2A.AT2 ,
supporting iAP profile, provides communication with Android, smartphone, and Apple
Bluetooth enabled devices.
®
iOS
An Apple authentication IC is required to exchange data with an Apple device or access an
Apple device application. The AT2 FW includes the Bluetooth SPP profile capable of
recognizing the Apple authentication chip.
Customers using the Apple authentication IC must register as developers to become an
Apple certified MFI member. License fees may apply, for additional information visit:
http://developer.apple.com/programs/which-program/index.html.
Certified MFI developers developing electronic accessories that connect to the iPod
iPhone
®
, and iPad® gain access to technical documentation, hardware components,
®
,
technical support and certification logos.
Customized firmware for peripheral device interaction, power optimization, security, and
other proprietary features may be supported and can be ordered pre-loaded and configured.
6/27Doc ID 022833 Rev 4
SPBT2632C2ARoHS compliance
2 RoHS compliance
ST modules are RoHS compliant and comply with ECOPACK® norms.
3 Applications
●Serial cable replacement
●M2M industrial control
●Service diagnostic
●Data acquisition equipment
●Machine control
●Sensor monitoring
●Security system
●Mobile health.
Doc ID 022833 Rev 47/27
Software architectureSPBT2632C2A
4 Software architecture
4.1 Lower layer stack
●Bluetooth v3.0
●Device power modes: active, sleep and deep sleep
●Wake on Bluetooth feature optimized power consumption of host CPU
●Authentication and encryption
●Encryption key length from 8 bits to 128 bits
●Persistent Flash memory for BD address and user parameter storage
1. Please note that the usage of ALT function is dependant upon the firmware that is loaded into the module,
and is beyond the scope of this document. The AT command interface uses the main UART by default.
Doc ID 022833 Rev 413/27
Hardware specificationsSPBT2632C2A
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5.8 Pin placement
Figure 2.Pin placement
5.9 Layout drawing
Figure 3.Layout drawing
14/27Doc ID 022833 Rev 4
SPBT2632C2AHardware block diagram
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6 Hardware block diagram
Figure 4.SPBT2632C2A.AT2 module block diagram
Doc ID 022833 Rev 415/27
Hardware designSPBT2632C2A
7 Hardware design
The SPBT2632C2A module without AT2 command embedded FW supports UART, SPI, I2C
and GPIO hardware interfaces. Note that the usage of these interfaces is dependent upon
the firmware that is loaded into the module, and is beyond the scope of this document. The
AT2 command interface uses the main UART by default.
Note:1All unused pins should be left floating; do not ground.
2All GND pins must be well grounded.
3The area around the module should be free of any ground planes, power planes, trace
routings, or metal for 6 mm from the antenna in all directions.
4Traces should not be routed underneath the module.
7.1 Module reflow installation
The SPB2632C2A is a surface mount Bluetooth module supplied on a 16-pin, 6-layer PCB.
The final assembly recommended reflow profiles are indicated here below.
The soldering phase must be executed with care: In order to avoid undesired melting
phenomenon, particular attention must be paid to the setup of the peak temperature.
The following are some suggestions for the temperature profile based on IPC/JEDEC JSTD-020C, July 2004 recommendations.
Table 8.Soldering
Profile featurePB-free assembly
Average ramp-up rate (T
Preheat:
– Temperature min. (T
– Temperature max. (T
–Time (t
Time maintained above:
– Temperature T
– Temperature T
Peak temperature (T
Time within 5 °C of actual peak temperature (T
Ramp-down rate6 °C/sec
Time from 25 °C to peak temperature8 minutes max.
min. to ts max.)(ts)
s
L
L
)240 + 0 °C
P
to TP)3 °C/sec max
SMAX
min.)
S
max.)
S
)10-20 sec
P
150 °C
200 °C
60-100 sec
217 °C
60-70 sec
16/27Doc ID 022833 Rev 4
SPBT2632C2AHardware design
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Figure 5.Soldering profile
7.2 GPIO interface
All GPIOs are capable of sinking and sourcing 4 mA of I/O current. GPIO [1] to GPIO [7] are
internally pulled down with 100 kΩ (nominal) resistors.
7.3 UART interface
The UART is compatible with the 16550 industry standard. Four signals are provided with
the UART interface. The TXD and RXD pins are used for data while the CTS and RTS pins
are used for flow control.
Figure 6.Connection to host device
Doc ID 022833 Rev 417/27
Hardware designSPBT2632C2A
!-V
SURROUNDING
!-V
Figure 7.Typical RS232 circuit
7.4 PCB layout guidelines
Figure 8.PCB layout guidelines
18/27Doc ID 022833 Rev 4
SPBT2632C2AHardware design
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7.5 Reset circuit
Two types of system reset circuits are detailed below.
7.5.1 External reset circuit
Figure 9.External reset circuit
Note:RPU ranges from 30 kΩ
to 50 kΩ internally.
7.5.2 Internal reset circuit
Figure 10. Internal reset circuit
Note:1R
2R
ranges from 30 kΩ to 50 kΩ internally.
PU
should be from 1 kΩ to 10 kΩ.
RST
Doc ID 022833 Rev 419/27
Hardware designSPBT2632C2A
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7.6 External LPO input circuit
An optional low power oscillator input may be added to allow Deep sleep and Sniff modes.
●LPO parameters:
–Frequency: 32.768 kHz
–Tolerance: 150 ppm
–Voltage levels
–Low: 0.5 V
–High: 1.8 V
–Input capacitance: 2.5 pF maximum
●Configurations:
–Use two configuration variables: UseExtLPO and AllowSniff.
Table 9.System configuration variables
VariableNameDefaultDescription
Var37UseExtLPO True
Var43 AllowSniff TrueEnables Sniff mode.
True when a 32.768 kHz low power oscillator is present, and false
if not present
Figure 11. External LPO circuit
20/27Doc ID 022833 Rev 4
SPBT2632C2AHardware design
!-V
!-V
7.7 Apple iOS CP reference design
The figures below give an indicative overview of what the hardware concept looks like. A
specific MFI co-processor layout is available for licensed MFI developers from the MFI
program.
Figure 12. BT module
Figure 13. Co-processor
Doc ID 022833 Rev 421/27
Hardware designSPBT2632C2A
!-V
Figure 14. Power switch
22/27Doc ID 022833 Rev 4
SPBT2632C2ARegulatory compliance
8 Regulatory compliance
●FCC and IC
–This module has been tested and found to comply with the FCC part 15 and IC
RSS-210 rules. These limits are designed to provide reasonable protection
against harmful interference in approved installations. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio
communications.
However, there is no guarantee that interference may not occur in a particular
installation.
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.
Modifications or changes to this equipment not expressly approved by the part
responsible for compliance may render void the user's authority to operate this
equipment.
–Modular approval, FCC and IC
FCC ID: X3ZBTMOD4
IC: 8828A-MOD4
In accordance with FCC part 15, the SPBT2632C2A.AT2 is listed above as a
modular transmitter device.
–Label instructions
When integrating the SPBT2632C2A.AT2 into the final product, it must be ensured
that the FCC labelling requirements, as specified below, are satisfied. Based on
the Public Notice from FCC, the product into which the ST transmitter module is
installed must display a label referring to the enclosed module. The label should
use wording such as the following:
Contains Transmitter Module
FCC ID: X3ZBTMOD4
IC: 8828A-MOD4
Any similar wording that expresses the same meaning may be used.
●BQB
–BQB qualified design, QD ID: B019224
–Product type: End Product
–TGP version: Core 3.0
–Core spec version: 3.0
–Product descriptions: Bluetooth module, spec V3.0
Doc ID 022833 Rev 423/27
Regulatory complianceSPBT2632C2A
●CE
–CE Expert opinion: 0448-ARAM00003
–Measurements have been performed in accordance with (report available on
request):
–EN 300 328 V 1.7.1 (2006-10)
–EN 301 489-17 V 2.1.1 (2009)
–EN60950-1:2006 +A11:2009+A1:2010
(a)
(b)
(c)
CE certified:
a. EN 300 328 V 1.7.1 (2006-10): “electromagnetic compatibility and radio spectrum Matters (ERM); Wideband
transmission systems; data transmission equipment operating in the 2.4 GHZ ISM band and using wideband
modulation techniques; harmonized EN covering essential requirements under article 3.2 of the R&TTE
directive”.
b. EN 301 489-17 V 2.1.1 (2009): “electromagnetic compatibility and radio spectrum Matters (ERM);
electromagnetic compatibility (EMC) standard for radio equipment and services; part 17: specific condition for
2.4 GHz wideband transmission systems and 5 GHz high performance RLAN equipment”.
c. EN60950-1:2006 +A11:2009+A1:2010: “Information technology equipment - safety”.
24/27Doc ID 022833 Rev 4
SPBT2632C2AOrdering information
9 Ordering information
Table 10.Ordering information
Order codeDescription
SPBT2632C2A.AT2Class 2 OEM Bluetooth antenna module
Doc ID 022833 Rev 425/27
Revision historySPBT2632C2A
10 Revision history
Table 11.Document revision history
DateRevisionChanges
03-Apr-20121First release.
16-Apr-20122Modified: Section 8
– Document status promoted from preliminary data to
12-Jun-20123
production data
– Modified: Figure 1
07-Aug-20124
– Added: notes in Ta bl e 6 and 7
– Modified: Section 7
26/27Doc ID 022833 Rev 4
SPBT2632C2A
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