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| may 2007 rev 2 1/16 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: interoper ability 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 ffx? 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 www.st.com
circuit description AN2542 2/16 1 circuit description 1.1 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 wit h 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 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. bt-sta2416c2 receiver module sta529 codec low-pass filter ts462 dual op-amp xtal 13 mhz stream connection indicator 3.3 v stereo line out 1 vpp bta2dp AN2542 circuit description 3/16 figure 3. schematic diagram, part 1 5 5 4 4 3 3 2 2 1 1 d d c c b b a a uart2_rxd uart2_txd bt_sig uart2_rxd uart2_txd bt_sig gnd gnd 3v3 bt 3v3 bt 3v3 bt 3v3 bt 3v3_529 3v3_opamp 3v3p_529 3v3_529 3v3_1.8 sta529_sda sta529_scl audio_l audio_r sta529_mute sta529_stby sel_clk33 sta529_reset pow_fault sta529_spi_rxd sta529_spi_txd sta529_spi_frm sta529_spi_clk title size document number rev date: sheet of bt-sta2416c2 AN2542 circuit description 5/16 figure 5. schematic diagram, part 3 5 5 4 4 3 3 2 2 1 1 d d c c b b a a 3v3_opamp 3v3_opamp audio_r audio_l out1a out1b out2a out2b title size document number rev date: sheet of opamp stmicroelectronics bt-sta2416-sta529q-opamp a 33 friday, february 23, 2007 title size document number rev date: sheet of opamp stmicroelectronics bt-sta2416-sta529q-opamp a 33 friday, february 23, 2007 title size document number rev date: sheet of opamp stmicroelectronics bt-sta2416-sta529q-opamp a 33 friday, february 23, 2007 close to the ic + c34 100u / 16v + c34 100u / 16v r30 4k7 r30 4k7 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 ic4 ada4841-2 ic4 ada4841-2 c38 150pf c38 150pf + c39 47u/16v + c39 47u/16v c37 150pf c37 150pf c45 150pf c45 150pf c35 2.2nf c35 2.2nf c36 150pf c36 150pf + c42 47u/16v + c42 47u/16v l2 ferrite l2 ferrite r50 30k r50 30k r37 4k7 r37 4k7 r43 15k r43 15k r33 30k r33 30k r47 4k7 r47 4k7 r38 15k r38 15k r44 10k r44 10k r42 4k7 r42 4k7 r39 10k r39 10k r41 4k7 r41 4k7 r49 30k r49 30k r36 4k7 r36 4k7 r29 30k r29 30k r31 4k7 r31 4k7 r48 4k7 r48 4k7 r32 4k7 r32 4k7 c43 100p c43 100p r34 1500 r34 1500 r46 4k7 r46 4k7 l1 ferrite l1 ferrite r40 4k7 r40 4k7 c41 150pf c41 150pf c44 2.2nf c44 2.2nf c46 150pf c46 150pf c33 0.1u c33 0.1u r45 1500 r45 1500 r35 4k7 r35 4k7 c40 100p c40 100p layout AN2542 6/16 2 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 AN2542 bom 7/16 3 bom ta bl e 1 gives the bill of material s for the receiver board. table 1. bill of materials item qty reference part footprint notes 1 1 c1 10 f, 16 v ce45 aluminium capacitor 4.5 mm 2 14 c2,c3,c4,c5,c8,c10, c18,c19,c20,c24, c26,c29,c31,c32 100 nf 0603 3 1 c6 82 pf 0603 4 2 c7,c9 22 pf 0603 5 1 c11 220 pf 0603 6 4 c12,c15,c17,c22 10 nf 0603 7 1 c13 10 f, 16 v ce66 aluminium capacitor 6.6 mm 8 5 c14,c16,c21,c28, c30 33 f, 10 v ce66 aluminium capacitor 6.6 mm 9 2 c23,c25 1 f 0805 10 1 c27 220 f, 16 v ce83 aluminium capacitor 8.3 mm 11 1 c33 0.1 f 0603 12 1 c34 100 f, 16 v ce66 aluminium capacitor 6.6 mm 13 2 c35,c44 2.2 nf 0603 14 6 c36,c37,c38,c41, c45,c46 150 pf 0603 15 2 c39, c42 47 f, 16 v ce66 aluminium capacitor 6.6 mm 16 2 c40,c43 100 pf 0603 17 1 d1 blue 0805 18 1 d2 1ss335 sod323 19 1 ic1 bt-sta2416c2 see module specs provided by st 20 1 ic2 sta529qfn vfqfpn52 provided by st 21 1 ic3 ld2985am18 sot23-5 provided by st 22 1 ic4 ts462 tssop8 provided by st 23 1 j1 con5 cn5_ra 5-pin male connector 2-mm step, right angle bom AN2542 8/16 24 1 j2 con2 cn2 2-pin connector 2-mm step, right angle 25 1 j3 con8 cn8 8-pin connector 2-mm step, 90 angle 26 1 j4 con9 conn9 9-pin connector for strip (2-mm step on adjacent pin) 27 1 j5 con5 coax_ra 90 or right sma connector 28 2 l1,l2 ferrite 0805 29 3 r1,r20,r21 1k ? 0603 30 3 r2,r26,r27 1r1 ? 0603 31 15 r3,r7,r9,r10,r11, r12,r13,r14,r15, r16,r17,r18,r19, r24,r28 0 ? 0603 wire connection 32 3 r4,r39,r44 10 k ? 0603 33 2 r5,r6 100 ? 0603 34 1 r8 3k3 ? 0603 35 1 r22 1 m ? 0603 36 1 r23 12 k ? 0603 37 1 r25 470 ? 0603 38 4 r29,r33,r49,r50 30 k ? 0603 39 12 r30,r31,r32,r35, r36,r37,r40,r41, r42,r46,r47,r48 4k7 ? 0603 40 2 r34,r45 1500 ? 0603 41 2 r38,r43 15 k ? 0603 42 1 sw1 sw key-spst sw 2-pin switch with 5-mm step 43 1 tp1 rst tp not soldered 44 1 tp2 pwren tp not soldered 45 1 tp3 boot tp not soldered 46 1 tp4 usb vcc tp not soldered 47 1 tp5 3.3 v tp not soldered 48 1 tp6 uart_txd tp not soldered 49 1 tp7 gnd tp not soldered table 1. bill of materials item qty reference part footprint notes AN2542 bom 9/16 50 1 tp8 uart rxd tp not soldered 51 1 tp9 vdd33 tp not soldered 52 1 tp10 dgnd tp not soldered 53 1 tp11 audio_l tp not soldered 54 1 tp12 agnd tp not soldered 55 1 tp13 audio_r tp not soldered 56 1 tp14 bt_reset tp not soldered 57 1 tp15 led_cont tp not soldered 58 1 y1 13 mhz qz-49sx smd crystal (11mm x 4.8mm) table 1. bill of materials item qty reference part footprint notes how to use the board AN2542 10/16 4 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. allow some time for the source device to discover the bluetooth ? technology device(s) in its neighborhood. 2. 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). 3. select it and choose the ?pair? option. 4. enter the code ?0000? to pair the source and the receiver. d1 again turns on with a successful connection. 5. refresh available services. 6. choose the only service within the list (the board only exposes the a2dp service). 7. start streaming audio. the two figures below are screen prints from the pc taken whilst following the above steps. the pc was running bluesoleil ? 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 bluesoleil ? 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. AN2542 how to use the board 11/16 figure 8. screen print: finding and selecting the demo board figure 9. screen print: audio streaming in progress interoperability AN2542 12/16 5 interoperability the board can accept audio from a2dp compliant audio sources. ta bl e 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. the firmware of the receiver demo board is being continually revised to include new results from our continued testing of new commercial products. update s 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. table 2. interoperability list manufacturer type model blackjack pda hp pda ipaq lg mobile phone gsm type lg mobile phone (eu)u890 lg mobile phone chocolate vx8500 motorola mobile phone (usa)krzr k1 motorola mobile phone v3x nokia mobile phone 8801 samsung mobile phone (china)e788 samsung mobile phone (eu)d820 samsung mobile phone (korea)sch-b380 samsung mobile phone (korea)sch-b5050 samsung mobile phone (korea)sch-b560 samsung mobile phone (korea)sch-b630 samsung mobile phone (korea)sch-v740 samsung mobile phone (korea)sgh-d600 samsung mobile phone (korea)sph-v9600 samsung mobile phone (korea)sph-v9850 samsung mp3 player yp-t9b sony ericsson mobile phone w850i sony ericsson mobile phone (china)p990i sony ericsson mobile phone (eu)w810i sony ericsson mobile phone (usa)k800i sony ericsson mobile phone (usa)w710i sony ericsson mobile phone (usa)w850i AN2542 certifications 13/16 6 certifications the stmicroelectronics chipset and modules are fully compliant with the bqb certifications under the prd 2.0 standard as given in ta b l e 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 ta b l e 3 . figure 10. bluetooth ? wireless module bt-sta2416c2 table 3. bqb qualified designs qualified designs manufacturer product id product type profiles qd id bluetooth ? module stmicroelectronics bt-sta2416c2 component rf, bb, lm, hci b012535 bluetooth ? stack open interface north america, inc. bluemagic ? 3.0 profile sub-system s d p, g a p, a2dp, avctp, avdtp, avrcp, gavdp, l2cap b010293 trademark and other acknowledgements AN2542 14/16 7 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 north america, inc. windows media ? is a registered trademark of microsoft corporation. AN2542 revision history 15/16 8 revision history table 4. document revision history date revision changes 26-apr-2007 1 first release 23-may-2007 2 trademark updates on pages 1, 13 and 15 AN2542 16/16 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2007 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com |
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