BT-STA2425 Bluetooth(R) technology module Features ! Bluetooth(R) 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(R) upper-layer stack including profiles Applications Supports USB1.1, UART, I2C, PCM, SPI, and 15 GPIOs ! Remote speakers ! Bluetooth(R) plug-in for TV, portable players Audio cradle systems Wireless audio systems ! (R) ! 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 (s) r P e t e l o s b O ! 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 ! o r P o s b O - ct u d o e t le c u d ) s t( ! Serial port replacement ! Industrial automation ! Wireless peripherals Description The BT-STA2425 is a flexible low-power module enabling Bluetooth(R) connectivity. It is fully programmable and capable of running the whole stack plus custom applications. The ARM7(R) 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 e t le ) s ( ct u d o r P e t e l o s b O 2/13 o s b O - o r P c u d ) s t( 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 e t le 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 (s) ct so b O - c u d ) s t( o r P 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 k 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 k o r P e 9 10 11 t e l o 12 s b O 49 du 3/13 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 k resistor 21 I2C1 I/O I2C 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 34 GPIO 4 I/O 35 GPIO 5 I/O 36 GPIO 6 37 GPIO 7 (t s) e t le c u d ) s t( o r P o s b O - 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 39 o r P e t e l o 40 4/13 Type 18 38 s b O Name c u d 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. c u d e t le ) s ( ct ) s t( o r P o s b O - u d o r P e t e l o s b O 5/13 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 ) s ( ct -20C < T < 70C c u d Min o r P 2.75 e t le Unit Typ 2.8 -20 so ) s t( Max Unit 2.85 V +70 C 40 mA 100 A b O - The parameters in Table 4 are specified at VDD = 2.8 V and Tamb = 25 C, unless specified otherwise. Table 4. u d o DC specifications r P e 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 VIL t e l o s b O 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/50s| CFD rate Hop Hopping 13M_CK System clock (s) ct du System clock stability o r P e LP_CK t e l o Tr 2402 BER = 0.1% -81 2402 dBm 3 P e let o s b O - dBm 1000 kHz dBm ) s t( dBm c u d ro -75 Unit 2480 MHz Frequency = 2402 to 2480 MHz dBm MHz +75 kHz 25 kHz 40 kHz 40 kHz 20 kHz/ s 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 s b O Conditions -200 Asyncronous kHz +200 ppm 1.4 Mbits /s 7/13 Mechanical information 4 BT-STA2425 Mechanical information Figure 3. Module dimensions (component side) c u d e t le Figure 4. Recommended land pattern (top view) ) s ( ct u d o r P e t e l o s b O 8/13 o s b O - o r P ) s t( 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 e t le c u d ) s t( o r P o s b O - 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: ) s ( ct - Antenova 30-30-A5839-01 - Murata ANCV12G44SAA127 - Pulse W3008 u d o r P e - " t e l o Yageo CAN4311153002451K An external antenna connected by means a SMA connector. Figure 6. Types of antenna for the BT-STA2425 module s b O 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 , by careful track layout, for maximum power transfer. Figure 7. Antenna connection Tracks 0 ==50 Traceswith withZZ0 50ohm Antennaconnection connection Antenna RF out pin 50 matching depends on various factors, for instance: c u d ) s t( " 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. e t le o r P 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 Track Trace width width t e l o bs O 10/13 ) s ( ct u d o (Dielectric constant) r P e PCB PCB thickness thickness o s b O - 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. c u d e t le ) s ( ct ) s t( o r P o s b O - u d o r P e t e l o s b O 11/13 Revision history 7 BT-STA2425 Revision history Table 6. Document revision history Date Revision 10-Dec-2007 1 Changes Initial release. c u d e t le ) s ( ct u d o r P e t e l o s b O 12/13 o s b O - o r P ) s t( BT-STA2425 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 herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. c u d ) s t( Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes 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. 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