STMICROELECTRONICS BT

BT-STA2425
Bluetooth® technology module
Features
!
Bluetooth® specification V 2.0 compliant
!
Transmission rate up to 721 kbit/s (basic rate)
and beyond (EDR)
!
Output power level: class 2 (0 dBm typical) and
class 1.5 (> 4 dBm)
!
Power class 1 compatible (with external power
amplifier)
!
ACL and SCO links
!
Full Bluetooth® upper-layer stack including
profiles
Applications
Supports USB1.1, UART, I2C, PCM, SPI, and
15 GPIOs
!
Remote speakers
!
Bluetooth® plug-in for TV, portable players
Audio cradle systems
Wireless audio systems
!
®
!
Embedded ARM7TDMI core processor
!
!
Integrated 4-Mbit flash, 64-KByte RAM,
4-Kbyte ROM
!
!
2.8-V single power supply
!
Designed for low power consumption in
standby condition
!
13-MHz and 32.768-kHz digital clock outputs
!
No external components needed - excluding
antenna
!
Module size: 29 mm x 17 mm
!
Fully programmable solution
!
Free development framework (CFWLite,
including real-time operating system)
!
Reference designs at no additional cost
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Proved for FCC/CE and BQB compliant
designs
!
Firmware library supporting profiles:
– A2DP, AVRCP sink and source
– HFP/HS
– SPP (up to 7 simultaneous connections
– Additional profiles under development
!
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Serial port replacement
!
Industrial automation
!
Wireless peripherals
Description
The BT-STA2425 is a flexible low-power module
enabling Bluetooth® connectivity. It is fully
programmable and capable of running the whole
stack plus custom applications.
The ARM7® embedded microcontroller can be
either programmed by the end-user or flashed
with our selection of firmware images, thereby
turning the module in a complete solution for
wireless audio connectivity or serial port
replacement.
A full set of peripherals is also available to allow
simple interfacing with other devices in the
system.
Order code: BT-STA2425
Seamless connection with ST audio codecs
and amplifiers (STA529, STA333BW,STA328)
December 2007
Rev 1
1/13
www.st.com
13
Block diagram
1
BT-STA2425
Block diagram
Figure 1.
Block diagram
Vdd1
(2.8v)
Supply voltage
regulator
1.8V
PCM
SPI
Ext PA
USB
I2C
STA2416
UART
STLC2500
Balun
ANT
GPIO
JTAG
RESET
32.768
Xtal
13 Mhz
oscillator
32.768 kHz
13 MHz
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BT-STA2425
2
Pin connections
Pin connections
Figure 2.
Pin connections (component side)
21
1
22
53
BT-STA2425
51
28
50
29
Table 1.
Pin description
Number
Name
Type
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RX_EN
O
RX Enable
2 (1)
PA_EN
O
External PA enable
3
(1)
PA_V1
O
External PA gain setting
4
(1)
PA_V0
O
5
(1)
ANT_SW
O
6
PMC_A
I/O
7
PMC_B
8
PMC_SYNC
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Description
(1)
1
Used in Class1 application
Used in Class1 application
Used in Class1 application
External PA gain setting
Used in Class1 application
Antenna switch
Used in Class1 application
Synchronous data in/out
I/O
Synchronous data out/in
I/O
Synchronous data strobe
PMC_CLK
I/O
Synchronous data clock
NTRST
I
JTAG0 pin
TDI
I
JTAG1 pin
TMS
I
JTAG2 pin
13
TCK
I
JTAG3 pin (must be connected to ground if not used)
14
TDO
I
JTAG4 pin
15
13M_CK
O
13 MHz oscillator out
16
RESET
I
Reset pin: a low on this pin resets the module.
An internal pull-up resistor of 100 kΩ to VDD and a
capacitor of 100 nF to GND is built into the module.
17
INT2
I
External interrupt signal, internally connected to GND via
10 kΩ
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Pin connections
Table 1.
BT-STA2425
Pin description (continued)
Number
Description
UART1_RXD
I
UART data input
19
UART1_TXD
O
UART data output
20
I2C0
I/O
I2C interface data, to be connected to VDD via 10 kΩ
resistor
21
I2C1
I/O
I2C interface clock, to be connected to VDD by 10 kΩ
resistor
22
USB_DN
I/O
USB data - (negative) (connect to GND if not used)
23
USB_DP
I/O
USB data + (positive) (connect to GND if not used)
24
SPI_FRM
I/O
SPI frame sync
25
SPI_CLK
I/O
SPI clock
26
SPI_TXD
O
SPI transmit data
27
SPI_RXD
I
SPI receive data (connect to GND if not used)
28
GND_S
PWR
High-quality signal ground
29
BOOT
I
External downloading enable: when low it allows the
firmware to be downloaded into the internal flash at
power-up
30
GPIO 0
I/O
General purpose input / output 0
31
GPIO 1
I/O
General purpose input / output 1
32
GPIO 2
I/O
General purpose input / output 2
33
GPIO 3
I/O
34
GPIO 4
I/O
35
GPIO 5
I/O
36
GPIO 6
37
GPIO 7
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-
General purpose input / output 3
General purpose input / output 4
General purpose input / output 5
I/O
General purpose input / output 6
Not to be used, internally used for STLC2500 wake-up
I/O
General purpose input / output 7
GPIO 8
I/O
General purpose input / output 8
Not to be used, internally used for STLC2500 reset
GPIO 9
I/O
General purpose input / output 9
LP_CK
O
32.768 kHz digital output
41
GPIO11
I/O
General purpose input / output 11
42
GPIO12
I/O
General purpose input / output 12
43
GPIO13
I/O
General purpose input / output 13
44
GPIO14
I/O
General purpose input / output 14
45
GPIO15
I/O
General purpose input / output 15
46
1V8
PWR
1.8 V internal regulator output.
Not to be used – only for test purposes
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Type
18
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BT-STA2425
Pin connections
Table 1.
Pin description (continued)
Number
Name
Type
Description
47
2V8
PWR
2.8-V internal regulator output.
Not to be used – only for test purposes
48
NC
I
Not connected
49
VDD
PWR
2.8 V power supply
The STA2416 I/Os and STLC2500 supply pins are
connected to this pin (the STA2416 supply voltage is
internally generated)
50
GND
PWR
Digital ground
51
GND_RF
PWR
RF ground
52
BT_ANTENNA
I/O
RF pad to be connected to the antenna
53
GND_RF
PWR
RF ground
1. Leave unconnected for Class-2/1.5 operation.
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Electrical specification
BT-STA2425
3
Electrical specification
3.1
Absolute maximum ratings
Table 2.
Absolute maximum ratings
Symbol
3.2
Parameter
VDD
Module supply voltage
Vin
Input voltage on any digital pin
Tstg
Storage temperature
Tsold
Soldering temperature < 10s
Min
Max
4
V
GND
- 0.3
VDD
+ 0.3
V
-40
+85
°C
250
°C
Operating range
Table 3.
Operating range
Symbol
3.3
Parameter
Conditions
VDD
Module supply voltage
Tstg
Operating ambient
temperature
Iop
Operating current.
VDD = 2.8 V
Iosb
Standby current.
VDD = 2.8 V, Inhibit = L
DC specifications
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-20°C < T < 70°C
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2.75
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Unit
Typ
2.8
-20
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Max
Unit
2.85
V
+70
°C
40
mA
100
µA
b
O
-
The parameters in Table 4 are specified at VDD = 2.8 V and Tamb = 25° C, unless specified
otherwise.
Table 4.
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DC specifications
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Symbol
Min
Low level input voltage
VIH
High level input voltage
2
Vhyst
Schmitt trigger hysteresis
0.4
VOL
Low level output voltage
VOH
High level output voltage
2.4
13M_CKH 13 MHz output high level
2.4
13M_CKL
6/13
Conditions
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Parameter
13 MHz output low level
Typ
Max
Unit
0.8
V
2.85
V
V
0.2
V
2.85
V
V
0.3
V
BT-STA2425
3.4
Electrical specification
Transmitter / receiver specifications
The parameters in Table 5 are specified at VDD = 2.8 V and Tamb = 25° C, unless specified
otherwise. RF sensitivity and output power parameters are measured on the antenna pad.
For more complete information please refer to the datasheets for STA2416 and STLC2500C
Table 5.
Tx/Rx specifications
Symbol
Parameter
Min
Typ
RFin
Input frequency range
RX sens
Receiver sensitivity
RFout
Output frequency range
TXpout
Nominal output power
TXout
Txout spectr at - 20 dBm
930
ACP
Channel offset = 2
-50
ACP
Channel offset = 3
-55
ACP
Channel offset = 4
-57
Chs
Channel space
∆F
Initial CF tolerance
|∆f-p1|
CFD 1 slot packet
|∆f-p3|
CFD 3 slot packet
|∆f-p5|
CFD 5 slot packet
|∆f/50µs|
CFD rate
Hop
Hopping
13M_CK
System clock
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System clock stability
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LP_CK
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Tr
2402
BER = 0.1%
-81
2402
dBm
3
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-
dBm
1000 kHz
dBm
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dBm
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-75
Unit
2480 MHz
Frequency = 2402 to 2480 MHz
dBm
MHz
+75
kHz
25
kHz
40
kHz
40
kHz
20
kHz/
µs
1600
hop/s
13
MHz
Tamb = 25° C
-10
+10
ppm
Tamb = -20° C to 70° C
-20
+20
ppm
32.76
8
Low-power mode clock
Low-power mode clock
accuracy
Transmission rate
Max
2480 MHz
1
System clock precision
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Conditions
-200
Asyncronous
kHz
+200 ppm
1.4
Mbits
/s
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Mechanical information
4
BT-STA2425
Mechanical information
Figure 3.
Module dimensions (component side)
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Figure 4.
Recommended land pattern (top view)
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BT-STA2425
5
Applications information
Applications information
The following are some suggestions to better implement the BT-STA2425 module in the final
application.
"
The module is usually mounted on a motherboard, so avoid routing tracks with
switching signals below the module. The best would be to have a ground plane beneath
the module.
"
Connect the power supply ground of the module with the other grounds in a star
fashion on the motherboard.
"
Keep the RF ground separate from the module power supply ground - the two grounds
are already connected at one point inside the module. A possible implementation is
shown in Figure 5.
Figure 5.
Ground connections
Module foot print
Supply voltage gnd
RF gnd
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The RF pin must be connected to an antenna which could be one of those shown in Figure 6
and explained as follows.
"
An antenna directly printed on the PCB
"
An integrated antenna, such as:
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–
Antenova 30-30-A5839-01
–
Murata ANCV12G44SAA127
–
Pulse W3008
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Yageo CAN4311153002451K
An external antenna connected by means a SMA connector.
Figure 6.
Types of antenna for the BT-STA2425 module
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Printed-circuit antenna
Integrated antenna
External antenna
9/13
Applications information
BT-STA2425
Whichever type of antenna is chosen, the connection from the RF antenna pin,
BT_ANTENNA, must follow good RF design practice and maintain the characteristic
impedance (Z0) of 50 Ω, by careful track layout, for maximum power transfer.
Figure 7.
Antenna connection
Tracks
0 ==50
Traceswith
withZZ0
50Ωohm
Antennaconnection
connection
Antenna
RF out pin
50 Ω matching depends on various factors, for instance:
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the type of board material, for example FR4
"
the electrical characteristics of the board, for example the relative permittivity, εr, at
2.4 GHz
"
the mechanical dimensions of the board and tracks, for example PCB thickness, track
and ground thicknesses, track width.
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As an example, using a 1-mm thick FR4 board (εr = 4.3 at 2.4 GHz) with copper thickness of
41 µm, the required track width for 50-Ω strip-line is 1.9 mm (microstrip-type calculation)
Figure 8.
Parameters for track matching
Track
Trace width
width
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PCB
PCB
thickness
thickness
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r
Trackthickness
thickness
Trace
Reference ground
Reference ground
Parameters for trace matching
Tools for calculating the characteristic impedance based on the physical and mechanical
characteristics of the PCB can be easily found on the internet.
BT-STA2425
6
Trademarks and other acknowledgements
Trademarks and other acknowledgements
Bluetooth is a registered trademark of Bluetooth SIG Inc.
ARM7 and ARM7TDMI are registered trademarks of ARM Limited.
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Revision history
7
BT-STA2425
Revision history
Table 6.
Document revision history
Date
Revision
10-Dec-2007
1
Changes
Initial release.
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BT-STA2425
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