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december 2007 rev 1 1/13 13 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 ! supports usb1.1, uart, i 2 c, pcm, spi, and 15 gpios ! 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 ! 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 ! seamless connection with st audio codecs and amplifiers (sta529, sta333bw,sta328) applications ! remote speakers ! bluetooth ? plug-in for tv, portable players ! audio cradle systems ! wireless audio systems ! 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 www.st.com
block diagram BT-STA2425 2/13 1 block diagram figure 1. block diagram stlc2500 sta2416 32.768 xtal 13 mhz oscillator balun supply voltage regulator pcm sp i usb i2c uart gpio ant 32.768 khz 13 mhz ext p a 1.8v reset jtag vdd1 (2.8v)
BT-STA2425 pin connections 3/13 2 pin connections figure 2. pin connections (component side) table 1. pin description number name type description 1 (1) rx_en o rx enable used in class1 application 2 (1) pa_en o external pa enable used in class1 application 3 (1) pa_v1 o external pa gain setting used in class1 application 4 (1) pa_v0 o external pa gain setting used in class1 application 5 (1) ant_sw o antenna switch used in class1 application 6 pmc_a i/o synchronous data in/out 7 pmc_b i/o synchronous data out/in 8 pmc_sync i/o synchronous data strobe 9 pmc_clk i/o synchronous data clock 10 ntrst i jtag0 pin 11 tdi i jtag1 pin 12 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 k ? to vdd and a capacitor of 100 nf to g nd is built into the module. 17 int2 i external interrupt signal, inte rnally connected to gnd via 10 k ? 53 1 29 22 21 50 49 BT-STA2425 28 51
pin connections BT-STA2425 4/13 18 uart1_rxd i uart data input 19 uart1_txd o uart data output 20 i2c0 i/o i 2 c interface data, to be connected to vdd via 10 k ? resistor 21 i2c1 i/o i 2 c interface clock, to be connected to vdd by 10 k ? 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 general purpose input / output 3 34 gpio 4 i/o general purpose input / output 4 35 gpio 5 i/o general purpose input / output 5 36 gpio 6 i/o general purpose input / output 6 not to be used, internally used for stlc2500 wake-up 37 gpio 7 i/o general purpose input / output 7 38 gpio 8 i/o general purpose input / output 8 not to be used, internally used for stlc2500 reset 39 gpio 9 i/o general purpose input / output 9 40 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 table 1. pin description (continued) number name type description
BT-STA2425 pin connections 5/13 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. table 1. pin description (continued) number name type description
electrical specification BT-STA2425 6/13 3 electrical specification 3.1 absolute maximum ratings 3.2 operating range 3.3 dc specifications the parameters in ta bl e 4 are specified at vdd = 2.8 v and tamb = 25 c, unless specified otherwise. table 2. absolute maximum ratings symbol parameter min max unit vdd module supply voltage 4 v vin input voltage on any digital pin gnd - 0.3 vdd + 0.3 v tstg storage temperature -40 +85 c tsold soldering temperature < 10s 250 c table 3. operating range symbol parameter conditions min typ max unit vdd module supply voltage -20c < t < 70c 2.75 2.8 2.85 v tstg operating ambient temperature -20 +70 c iop operating current. vdd = 2.8 v 40 ma iosb standby current. vdd = 2.8 v, inhibit = l 100 a table 4. dc specifications symbol parameter conditions min typ max unit vil low level input voltage 0.8 v vih high level input voltage 2 2.85 v vhyst schmitt trigger hysteresis 0.4 v vol low level output voltage 0.2 v voh high level output voltage 2.4 2.85 v 13m_ckh 13 mhz output high level 2.4 v 13m_ckl 13 mhz output low level 0.3 v
BT-STA2425 electrical specification 7/13 3.4 transmitter / rece iver specifications the parameters in ta bl e 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 conditions min typ max unit rfin input frequency range 2402 2480 mhz rx sens receiver sensitivity ber = 0.1% -81 dbm rfout output frequency range 2402 2480 mhz txpout nominal output power frequency = 2402 to 2480 mhz 3 dbm txout txout spectr at - 20 dbm 930 1000 khz acp channel offset = 2 -50 dbm acp channel offset = 3 -55 dbm acp channel offset = 4 -57 dbm chs channel space 1 mhz ? f initial cf tolerance -75 +75 khz |? f-p1 | cfd 1 slot packet 25 khz |? f-p3 | cfd 3 slot packet 40 khz |? f-p5 | cfd 5 slot packet 40 khz |? f/50 s | cfd rate 20 khz/ s hop hopping 1600 hop/s 13m_ck system clock 13 mhz system clock precision tamb = 25 c -10 +10 ppm system clock stability tamb = -20 c to 70 c -20 +20 ppm lp_ck low-power mode clock 32.76 8 khz low-power mode clock accuracy -200 +200 ppm tr transmission rate asyncronous 1.4 mbits /s
mechanical information BT-STA2425 8/13 4 mechanical information figure 3. module dimensions (component side) figure 4. recommended land pattern (top view)
BT-STA2425 applications information 9/13 5 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 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: ? antenova 30-30-a5839-01 ? murata ancv12g44saa127 ? pulse w3008 ? yageo can4311153002451k " an external antenna connected by means a sma connector. figure 6. types of antenna for the BT-STA2425 module rf gnd supply voltage gnd module foot print printed-circuit antenna integrated antenna external antenna
applications information BT-STA2425 10/13 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 (z 0 ) of 50 ? , by careful track layout, for maximum power transfer. figure 7. antenna connection 50 ? matching depends on various factors, for instance: " the type of board material, for example fr4 " the electrical characteristics of the board, for example the relative permittivity, r, at 2.4 ghz " the mechanical dimensions of the board and tracks, for example pcb thickness, track and ground thicknesses, track width. as an example, using a 1-mm thick fr4 board ( r = 4.3 at 2.4 ghz) with copper thickness of 41 m, the required track width for 50- ? strip-line is 1.9 mm (microstrip-type calculation) figure 8. parameters for track matching tools for calculating the characteristic impe dance based on the physical and mechanical characteristics of the pcb can be easily found on the internet. traces with z0 = 50 ohm antenna connection rf out pin tracks with z 0 = 50 ? antenna connection r ( dielectric constant ) pcb thickness trace width reference g round parameter s for trace matching trace thickness track thickness reference ground pcb track width thickness
BT-STA2425 trademarks and other acknowledgements 11/13 6 trademarks and other acknowledgements bluetooth is a registered trademark of bluetooth sig inc. arm7 and arm7tdmi are registered trademarks of arm limited.
revision history BT-STA2425 12/13 7 revision history table 6. document revision history date revision changes 10-dec-2007 1 initial release.
BT-STA2425 13/13 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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