AN2542 Application note
Demo board BT-HTS-Rx_V1.0 for audio receiver using Bluetooth wireless technology
Features
! ! !
Class 2 A2DP Bluetooth technology receiver 1-Vpp line-out (stereo) Single 3.3-V supply.
Overview
This board is designed for the evaluation of the BT-STA2416C2 receiver module in an A2DP environment. It is based on the SOUNDabout and BLUEmagic software of Open Interface North America and it guarantees a broad compatibility with boards from many other manufacturers as given in Section 5: Interoperability on page 12. A full set of certifications is given on page 13. The board also accommodates the STA529 device. This is a codec with an high efficiency FFXTM class-D output stage. The line output pin is driven by the TS462 op-amp configured to filter the PWM and to scale the output to 1 Vpp. The output signal can be used to feed an amplification stage. Both ICs (codec and op-amp) and the entire Bluetooth technology module are designed and manufactured by STMicroelectronics. Figure 1 shows the BT-HTS-RX_V1.0 demo board. The BT-STA2416C2 Bluetooth technology module and the RF antenna connection are positioned on the right-hand side of the board, the STA529 codec is in the middle and the TS462 op-amp is on the left. Figure 1. BT-HTS-RX_V1.0 demonstration board
May 2007
Rev 2
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www.st.com
Circuit description
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1.1
Circuit description
Block diagram
Figure 2 shows the block diagram of the BT-HTS-RX board. The Bluetooth technology stream received by the RF antenna is sent to the BT-STA2416C2, a highly integrated module able to communicate wirelessly with BTA2DP sources such as cellular phones, BT Dongles and Notebook PCs. Whilst streaming audio the receiver manages the BT data in the BT-STA2416C2 module, transferring them to the STA529, an IC comprising a digital stereo class-D audio amplifier, a DSP and a CMOS power output stage based on the FFX technology. The STA529 is dedicated to the decoding and the generation of the PWM analog output. A low-pass filter stage cuts the high frequencies of the PWM signal before amplification to a standard line-out signal of 1 Vpp. Figure 2. Circuit block diagram
3.3 V
BT-STA2416C2 Receiver module BTA2DP Strea m connection indicator
STA529 Codec XTAL 13 MHz Low-pass filter
T S4 6 2 Dual op-amp
Stere o line out 1 Vpp
1.2
Schematic
Figure 3, Figure 4 and Figure 5 make up the overall schematic. You can zoom in to see the detail or you can download the original OrCAD and PDF files from http://www.st.com/stonline/products/applications/blocks/consumer/conb005.shtml.
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5
4
3
2
1
ALL Vdd (3.3V) must be connected only at the CON9 pin 5
3V3P_529 BLUE AUDIO_R AUDIO_L 3V3_OPAMP 3V3_1.8 BT_SIG R1 3V3_529 1k R2 1R1
D1
J1
Figure 3.
3V3 BT
3V3_529
R3 0
1 2 3 4 5
CON5 J2
D
D
3V3 BT D2 R5 100 1SS335 + C1 10uF 16V
R4
10k
TP1 TP2
1 2
CON2 J3
TP3 TP4 TP5 TP6 TP7 TP8 R6 100
RST PWREN BOOT USB VCC 3.3V UART_TXD GND UART RXD
J4
CON8
R7 0 100nF 3V3 BT R8 3k3 C2
BT_SIG
1 2 3 4 5 6 7 8
UART2_TXD
TP9 TP10
C
C
1 2 3 4 5 6 7 8 9 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25
UART2_RXD
CON9 GND
Schematic diagram, part 1
VDD33 DGND AUDIO_L AGND AUDIO_R BT_RESET LED_CONT
TP11 TP12 TP13 TP14 TP15
1
Vss1 Vdd GPIO15
GPIO14 GPIO13 GPIO12 N.C. GPIO11 GPIO9 GPIO8 GPIO7 GPIO6 GPIO5 GPIO4 GPIO3 GPIO2 GPIO1 GPIO0
SW1
2
R9 R10 R11 R12 R13
0 0 0 0 0
POW_FAULT STA529_RESET SEL_CLK33 STA529_STBY STA529_MUTE
CON5 IC1
1 2 3 4 5 43 44 45 Vss2 (RF GND) +ANTENNA Vss2 (RF GND)
BT-STA2416C2
J5
R14 R15
0 0
B
BOOT RESET USB_DP USB_DN SPI_RXD SPI_TXD SPI_CLK SPI_FRM 17
24 23 22 21 20 19 18
STA529_SPI_RXD STA529_SPI_TXD R16 R17 R18 R19 0 0 0 0 STA529_SPI_CLK STA529_SPI_FRM STA529_SCL STA529_SDA
B
A
1 2 3 4 5 6 7 8 9 10 11 12 UART2_RXD 13 UART2_TXD 14 15 16
ALL GNDs must be connected only at the CON9 pin 7
TDI TMS NTRST TDO TCK INT1 I2C_DAT I2C_CLK PCM_CLK PCM_SYNC PCM_B PCM_A UART2_RXD UART2_TXD UART2_I1 UART2_O2
R20 1k 3V3 BT
R21 1k
A
GND
Title STMICROELECTRONICS BT-STA2416C2-STA529Q-OPAMP Size B Date:
4 3 2
Document Number BT-STA2416C2 Tuesday, February 20, 2007 Sheet
1
Rev
Circuit description
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5
1 52 51 50 49 48 47 46 45 44 43 42 41 40
3V3_529 C8 XTO XTI R24 0 100nF 12K
C13 + C12 C14 + IC2 STA529QFN 10nF 33uF 10V STA529_RESET C19 C16 + 10nF 1V8 100nF C17 10nF C15 R25 470 10uF 16V
STBY BICKO BICKI Vdd_IO1 GND_IO1 LRCKO LRCKI SDATAO SDATAI Vdd1 GND1 Vdd_PLL GND_PLL FILT
15 16 17 18 19 20 21 22 23 24 25 26
3V3_1.8
STA529_MUTE
Vcc1A OUT1A GND1A GND1B OUT1B Vcc1B Vcc2B OUT2B GND2B GND2A OUT2A Vcc2A
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4 3 2 1
5
Circuit description
C3 STA529_SPI_TXD 100nF XTI C5 C4 3V3_529 STA529_SPI_CLK STA529_STBY C6 100nF STA529_SPI_FRM 100nF XTO R22 1M 1A8 STA529_SPI_RXD
Figure 4.
1V8
D
D
13MHz Y1 C7 22pF C9 22pF
close to the IC
R23 C11 220pF
82pF
C10
100nF
SEL_CLK33 STA529_SDA STA529_SCL POW_FAULT 3V3P_529 C20 100nF 100nF 3V3_529 C18
C
C
2 3 4 5 6 7 8 9 10 11 12 13 14 INL INR VBIAS AVDD Vhi Vlo AGND VCM RESET CLKOUT GND2 VDD2 MUTE XTO XTI MCLK_33 SEL_CLK33 SDA SCL I2C DIS TM PWR_FAULT Vcc33 Vdd_IO2 GND_IO2 GND33
39 38 37 36 35 34 33 32 31 30 29 28 27
Schematic diagram, part 2
33uF 10V
OUT1A OUT1B C22 10nF 33uF 10V C23 1uF C24 100nF 3V3P_529 C25 1uF
OUT2A OUT2B
1V8
1A8
C21 +
3V3P_529 C26 100nF +
IC3
C27 220uF/16V
B
B
1
IN
OUT
5
R26
1R1
2 4
+ C29 C32 100nF 100nF R27 1R1 33uF 10V C28
GND
3
INH
BYP
+ C30
33uF 10V
C31
LD2985AM18
100nF
R28
0
A
A
Title STMICROELECTRONICS BT-STA2416-STA529Q-OPAMP Size B Date:
4 3 2
Document Number STA529Q Tuesday, February 20, 2007 Sheet
1
Rev 2 of 3
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4
3
2
1
close to the IC C33 0.1u + C34 100u / 16V R29 30k
Figure 5.
3V3_OPAMP
D
D
OUT2B C35 2.2nF R34 1500 C38 150pF + 15k OUT2A R38 47u/16V R35 4k7 R36 4k7 R37 4k7 C39 L1 FERRITE R39 10k C36 150pF R33 30k C37 150pF
R30
4k7
R31
4k7
R32
4k7
C40 100p
AUDIO_R
Schematic diagram, part 3
C
C
4
3
2 2 1
4
Title Rev 5 6 OPAMP 5 Sheet 3 of 3 6
3
1 IC4 ADA4841-2 8 8
STMICROELECTRONICS BT-STA2416-STA529Q-OPAMP 7 7
Size A
Document Number
Date:
Friday, February 23, 2007
B
B
C41 OUT1A R40 4k7 R41 4k7 R42 4k7 R43 R45 1500 R46 4k7 R47 4k7 R48 4k7 R50 30k C46 150pF R49 C44 2.2nF C45 150pF
150pF 15k
C42 +
L2 FERRITE 47u/16V R44 10k C43 100p AUDIO_L
OUT1B
30k
3V3_OPAMP
A
Circuit description
A
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5
4
3
2
1
Layout
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Layout
Figure 6 and Figure 7 show the PCB layout of the top and bottom layers. The complete set of OrCAD files can be found on the web page http://www.st.com/stonline/products/applications/blocks/consumer/conb005.shtml. Figure 6. Top layer viewed from top side
Figure 7.
Bottom layer viewed from top side
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BOM
3
BOM
Table 1 gives the bill of materials for the receiver board. Table 1.
Item 1 2 1 14 Qty C1
Bill of materials
Reference Part 10 F, 16 V Footprint CE45 0603 Notes Aluminium capacitor 4.5 mm
C2,C3,C4,C5,C8,C10, 100 nF C18,C19,C20,C24, C26,C29,C31,C32 C6 C7,C9 C11 C12,C15,C17,C22 C13 C14,C16,C21,C28, C30 C23,C25 C27 C33 C34 C35,C44 C36,C37,C38,C41, C45,C46 C39, C42 C40,C43 D1 D2 IC1 IC2 IC3 IC4 J1 82 pF 22 pF 220 pF 10 nF 10 F, 16 V 33 F, 10 V 1 F 220 F, 16 V 0.1 F 100 F, 16 V 2.2 nF 150 pF 47 F, 16 V 100 pF BLUE 1SS335 BT-STA2416C2 STA529QFN LD2985AM18 TS462 CON5
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
1 2 1 4 1 5 2 1 1 1 2 6 2 2 1 1 1 1 1 1 1
0603 0603 0603 0603 CE66 CE66 0805 CE83 0603 CE66 0603 0603 CE66 0603 0805 SOD323 See module specs VFQFPN52 SOT23-5 TSSOP8 CN5_RA Provided by ST Provided by ST Provided by ST Provided by ST 5-pin male connector 2-mm step, right angle Aluminium capacitor 6.6 mm Aluminium capacitor 6.6 mm Aluminium capacitor 8.3 mm Aluminium capacitor 6.6 mm Aluminium capacitor 6.6 mm
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BOM Table 1.
Item 24 1 Qty J2
AN2542 Bill of materials
Reference CON2 Part CN2 Footprint Notes 2-pin connector 2-mm step, right angle 8-pin connector 2-mm step, 90 angle 9-pin connector for strip (2-mm step on adjacent pin) 90 or right SMA connector
25
1
J3
CON8
CN8
26
1
J4
CON9
CONN9
27 28 29 30 31
1 2 3 3 15
J5 L1,L2 R1,R20,R21 R2,R26,R27 R3,R7,R9,R10,R11, R12,R13,R14,R15, R16,R17,R18,R19, R24,R28 R4,R39,R44 R5,R6 R8 R22 R23 R25 R29,R33,R49,R50 R30,R31,R32,R35, R36,R37,R40,R41, R42,R46,R47,R48 R34,R45 R38,R43 SW1 TP1 TP2 TP3 TP4 TP5 TP6 TP7
CON5 FERRITE 1k 1R1 0
COAX_RA 0805 0603 0603 0603
wire connection
32 33 34 35 36 37 38 39
3 2 1 1 1 1 4 12
10 k 100 3k3 1 M 12 k 470 30 k 4k7
0603 0603 0603 0603 0603 0603 0603 0603
40 41 42 43 44 45 46 47 48 49
2 2 1 1 1 1 1 1 1 1
1500 15 k SW KEY-SPST RST PWREN BOOT USB VCC 3.3 V UART_TXD GND
0603 0603 SW TP TP TP TP TP TP TP 2-pin switch with 5-mm step Not soldered Not soldered Not soldered Not soldered Not soldered Not soldered Not soldered
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AN2542 Table 1.
Item 50 51 52 53 54 55 56 57 58 1 1 1 1 1 1 1 1 1 Qty TP8 TP9 TP10 TP11 TP12 TP13 TP14 TP15 Y1
BOM Bill of materials
Reference Part UART RXD VDD33 DGND AUDIO_L AGND AUDIO_R BT_RESET LED_CONT 13 MHz TP TP TP TP TP TP TP TP QZ-49SX Footprint Notes Not soldered Not soldered Not soldered Not soldered Not soldered Not soldered Not soldered Not soldered SMD crystal (11mm x 4.8mm)
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How to use the board
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How to use the board
The board is simple to set up and use. Just connect the power supply to the supply wires ensuring that the red wire is 3.3 V and the black is 0 V (ground). Connect a suitable amplifier with speakers or headphones, if desired, to the line output. The board can communicate to any of the tested A2DP BT sources given in Section 5: Interoperability on page 12. Turn on the transmitter and source equipment and the BT-HTS_RX board. When the power to the board is turned on the blue LED (D1) turns on for a short time indicating the initialization of the board. After the LED extinguishes the board is ready to operate. Now follow this procedure. 1. 2. 3. 4. 5. 6. 7. Allow some time for the source device to discover the Bluetooth technology device(s) in its neighborhood. Find this demo board in the list of the discovered devices: the demo board appears with its name (HTS_RX) and/or its address (00:80:E1:00:01:00). Select it and choose the "pair" option. Enter the code "0000" to pair the source and the receiver. D1 again turns on with a successful connection. Refresh available services. Choose the only service within the list (the board only exposes the A2DP service). Start streaming audio.
The two figures below are screen prints from the PC taken whilst following the above steps. The PC was running BlueSoleilTM 1.4.8.1 software by IVT Corporation for setting up and controlling the devices. Figure 8 refers to points 2, 3 and 4 above. Here you can see all of the discovered devices. On selecting the HTS_RX demo board, its BD address appears on the left bottom of the main window. The smaller pop-up window asks for the pairing code related to the board. Pairing is accomplished as soon as the code "0000" is confirmed, then the refreshing of the available services highlights the AV service. The BT-HTS-RX audio receiver board indicates a successful connection by turning on the blue LED after pairing. Figure 9 shows the window during audio streaming that begins once that service is launched. In this kind of test extra software for playing the audio is required (for example, Windows Media player by Microsoft Corporation) since BlueSoleilTM software does not do it. Of course, actual needs are related to the source used for the BT connection. For instance, the portable MP3 players and mobile phones that are compliant to this standard already incorporate all of the necessary items. Refer to the specific source product for further information.
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AN2542 Figure 8. Screen print: finding and selecting the demo board
How to use the board
Figure 9.
Screen print: audio streaming in progress
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Interoperability
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Interoperability
The board can accept audio from A2DP compliant audio sources. Table 2 lists the commercial source products tested up to April 2007. For some of these products to operate properly it may be necessary to update the firmware. Table 2. Interoperability list
Manufacturer Blackjack HP LG LG LG Motorola Motorola Nokia Samsung Samsung Samsung Samsung Samsung Samsung Samsung Samsung Samsung Samsung Samsung Sony Ericsson Sony Ericsson Sony Ericsson Sony Ericsson Sony Ericsson Sony Ericsson PDA PDA Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone MP3 Player Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone Mobile phone IPAQ GSM type (EU)U890 Chocolate VX8500 (USA)krzr k1 V3X 8801 (China)E788 (EU)D820 (Korea)SCH-B380 (Korea)SCH-B5050 (Korea)SCH-B560 (Korea)SCH-B630 (Korea)SCH-V740 (Korea)SGH-D600 (Korea)SPH-V9600 (Korea)SPH-V9850 YP-T9B W850i (China)P990i (EU)W810i (USA)K800i (USA)W710i (USA)W850i Type Model
The firmware of the receiver demo board is being continually revised to include new results from our continued testing of new commercial products. Updates will be available on newer demo boards as soon as they are released. The present firmware release is marked STM849_SINK_V10_E1.0.0.
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Certifications
The STMicroelectronics chipset and modules are fully compliant with the BQB certifications under the PRD 2.0 standard as given in Table 3. The stack, supplied by Open Interface North America, Inc. is BQB certified and provides full connectivity for our Bluetooth wireless technology kit by supporting different profiles as given in Table 3. Table 3.
Qualified designs Bluetooth module
BQB qualified designs
Manufacturer STMicroelectronics Product ID BT-STA2416C2 Product Type Component Profiles RF, BB, LM, HCI QD ID B012535
Bluetooth stack
Open Interface North America, Inc.
BLUEmagic 3.0
Profile sub-system
SDP, GAP, A2DP, AVCTP, AVDTP, B010293 AVRCP, GAVDP, L2CAP
Figure 10. Bluetooth wireless module BT-STA2416C2
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Trademark and other acknowledgements
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Trademark and other acknowledgements
Bluetooth is a registered trademark of Bluetooth SIG Inc. FFX is an STMicroelectronics proprietary digital modulation technology. OrCAD is a registered trademark of OrCAD Systems Corporation. BlueSoleil is a trademark of IVT Corporation. BLUEmagic and SOUNDabout are registered trademarks of Open Interface Nor th America, Inc. Windows Media is a registered trademark of Microsoft Corporation.
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Revision history
8
Revision history
Table 4.
Date 26-Apr-2007 23-May-2007 1 2
Document revision history
Revision First release Trademark updates on pages 1, 13 and 15 Changes
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