BT-STA2425

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, I2C, 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 ® Applications ! ! ! ! ! ! ! Remote speakers Bluetooth® plug-in for TV, portable players Audio cradle systems Wireless audio systems Serial port replacement Industrial automation Wireless peripherals 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) bs O ! let o Pr e du o ct (s) so Ob - te le ro P uc d s) t( 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 December 2007 Rev 1 1/13 www.st.com 13 Block diagram BT-STA2425 1 Block diagram Figure 1. Block diagram Vdd1 (2.8v) Supply voltage regulator 1.8V PCM SPI USB I2C UART GPIO JTAG RESET 32.768 Xtal 13 Mhz oscillator Balun Ext PA STA2416 STLC2500 ANT 32.768 kHz 13 MHz bs O let o Pr e du o (s) ct so Ob - te le ro P uc d s) t( 2/13 BT-STA2425 Pin connections 2 Pin connections Figure 2. Pin connections (component side) 21 1 22 53 BT-STA2425 28 51 50 29 49 Table 1. Number 1 (1) Pin description Name RX_EN PA_EN PA_V1 PA_V0 ANT_SW PMC_A PMC_B PMC_SYNC O O O O O I/O Type RX Enable Description 2 (1) 3 4 5 6 7 8 9 10 (1) (1) (1) External PA enable External PA gain setting bs O let o 12 13 14 15 16 11 ro P e TDI TMS TCK TDO PMC_CLK du ct I/O I/O (s) Ob - External PA gain setting Antenna switch so te le Used in Class1 application Used in Class1 application Used in Class1 application Used in Class1 application Used in Class1 application ro P uc d s) t( Synchronous data in/out Synchronous data out/in Synchronous data strobe Synchronous data clock JTAG0 pin JTAG1 pin JTAG2 pin JTAG3 pin (must be connected to ground if not used) JTAG4 pin 13 MHz oscillator out 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. External interrupt signal, internally connected to GND via 10 kΩ I/O I I I I I O I NTRST 13M_CK RESET 17 INT2 I 3/13 Pin connections Table 1. Number 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 BT-STA2425 Pin description (continued) Name UART1_RXD UART1_TXD I2C0 I2C1 USB_DN USB_DP SPI_FRM SPI_CLK SPI_TXD SPI_RXD GND_S BOOT GPIO 0 GPIO 1 GPIO 2 GPIO 3 GPIO 4 GPIO 5 GPIO 6 GPIO 7 I O I/O I/O I/O I/O I/O I/O O I PWR I I/O I/O I/O I/O I/O Type UART data input UART data output I2C interface data, to be connected to VDD via 10 kΩ resistor I2C interface clock, to be connected to VDD by 10 kΩ resistor USB data - (negative) (connect to GND if not used) USB data + (positive) (connect to GND if not used) SPI frame sync SPI clock SPI transmit data SPI receive data (connect to GND if not used) High-quality signal ground Description External downloading enable: when low it allows the firmware to be downloaded into the internal flash at power-up General purpose input / output 0 General purpose input / output 1 bs O let o 40 41 42 43 44 45 46 39 ro P e LP_CK GPIO 8 uc d (s) t I/O I/O I/O I/O O I/O I/O I/O I/O I/O PWR I/O so Ob - General purpose input / output 2 General purpose input / output 3 General purpose input / output 4 General purpose input / output 5 te le ro P uc d s) t( General purpose input / output 6 Not to be used, internally used for STLC2500 wake-up General purpose input / output 7 General purpose input / output 8 Not to be used, internally used for STLC2500 reset General purpose input / output 9 32.768 kHz digital output General purpose input / output 11 General purpose input / output 12 General purpose input / output 13 General purpose input / output 14 General purpose input / output 15 1.8 V internal regulator output. Not to be used – only for test purposes GPIO 9 GPIO11 GPIO12 GPIO13 GPIO14 GPIO15 1V8 4/13 BT-STA2425 Table 1. Number 47 48 2V8 NC Pin connections Pin description (continued) Name Type PWR I Description 2.8-V internal regulator output. Not to be used – only for test purposes Not connected 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) Digital ground RF ground RF pad to be connected to the antenna RF ground 49 VDD PWR 50 51 52 53 GND GND_RF BT_ANTENNA GND_RF PWR PWR I/O PWR 1. Leave unconnected for Class-2/1.5 operation. bs O let o Pr e du o (s) ct so Ob - te le ro P uc d s) t( 5/13 Electrical specification BT-STA2425 3 3.1 Electrical specification Absolute maximum ratings Table 2. Symbol VDD Vin Tstg Tsold Module supply voltage Input voltage on any digital pin Storage temperature Soldering temperature < 10s GND - 0.3 -40 Absolute maximum ratings Parameter Min 4 VDD + 0.3 +85 250 Max Unit V V °C °C 3.2 Operating range Table 3. Symbol VDD Tstg Iop Iosb Operating range Parameter Module supply voltage Operating ambient temperature Operating current. Standby current. VDD = 2.8 V Conditions -20°C < T < 70°C Min VDD = 2.8 V, Inhibit = L 3.3 DC specifications The parameters in Table 4 are specified at VDD = 2.8 V and Tamb = 25° C, unless specified otherwise. Table 4. Symbol bs O let o VIL VIH Pr e DC specifications Parameter du o (s) ct Ob - so te le ro P 2.75 -20 uc d Typ 2.8 40 100 Max s) t( V °C Unit 2.85 +70 mA µA Conditions Min Typ Max 0.8 Unit V V V Low level input voltage High level input voltage 2 0.4 2.85 Vhyst VOL VOH Schmitt trigger hysteresis Low level output voltage High level output voltage 0.2 2.4 2.4 0.3 2.85 V V V V 13M_CKH 13 MHz output high level 13M_CKL 13 MHz output low level 6/13 BT-STA2425 Electrical specification 3.4 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. Symbol RFin RX sens RFout TXpout TXout ACP ACP ACP Chs ∆F |∆f-p1| |∆f-p3| |∆f-p5| |∆f/50µs| Hop 13M_CK Tx/Rx specifications Parameter Input frequency range Receiver sensitivity Output frequency range Nominal output power Txout spectr at - 20 dBm Channel offset = 2 Channel offset = 3 Channel offset = 4 Channel space Initial CF tolerance CFD 1 slot packet CFD 3 slot packet CFD 5 slot packet CFD rate Hopping System clock -75 Frequency = 2402 to 2480 MHz BER = 0.1% 2402 3 930 -50 -55 Conditions Min 2402 -81 Typ Max Unit 2480 MHz dBm 2480 MHz dBm 1000 kHz System clock precision System clock stability LP_CK bs O let o Tr ro P e Low-power mode clock Low-power mode clock accuracy Transmission rate Asyncronous -200 du ct (s) so Ob Tamb = 25° C eP let ro uc d 1 -57 s) t( dBm dBm dBm MHz kHz +75 25 40 40 20 1600 13 kHz kHz kHz kHz/ µs hop/s MHz -10 -20 32.76 8 +10 +20 ppm ppm kHz Tamb = -20° C to 70° C +200 ppm 1.4 Mbits /s 7/13 Mechanical information BT-STA2425 4 Mechanical information Figure 3. Module dimensions (component side) Figure 4. Recommended land pattern (top view) bs O let o Pr e du o (s) ct so Ob - te le ro P uc d s) t( 8/13 BT-STA2425 Applications information 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. Ground connections " " Figure 5. Module foot print Supply voltage gnd RF gnd 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 " bs O let o Figure 6. Pr e An external antenna connected by means a SMA connector. Types of antenna for the BT-STA2425 module du o (s) ct so Ob - te le ro P uc d s) t( 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 with Z0 ==550Ω Traces with Z0 0 ohm Antenna connection Antenna connection RF out pin 50 Ω 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, εr, 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 (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 width Trace width PCB PCB thickness thickness O bs let o Pr e du ε (Dielectric constant) o r Parameters for trace matching (s) ct so Ob - te le ro P uc d s) t( Track thickness Trace thickness Reference ground Reference ground Tools for calculating the characteristic impedance based on the physical and mechanical characteristics of the PCB can be easily found on the internet. 10/13 BT-STA2425 Trademarks and other acknowledgements 6 Trademarks and other acknowledgements Bluetooth is a registered trademark of Bluetooth SIG Inc. ARM7 and ARM7TDMI are registered trademarks of ARM Limited. bs O let o Pr e du o (s) ct so Ob - te le ro P uc d s) t( 11/13 Revision history BT-STA2425 7 Revision history Table 6. Date 10-Dec-2007 Document revision history Revision 1 Initial release. Changes bs O let o Pr e du o (s) ct so Ob - te le ro P uc d s) t( 12/13 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. 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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