EBWT32-A

WT32 EVALUATION KIT DATA SHEET Monday, 09 September 2013 Version 2.2 Copyright © 2000-2013 Bluegiga Technologies All rights reserved. Bluegiga Technologies assumes no responsibility for any errors which may appear in this manual. Furthermore, Bluegiga Technologies reserves the right to alter the hardware, software, and/or specifications detailed here at any time without notice and does not make any commitment to update the information contained here. Bluegiga’s products are not authorized for use as critical components in life support devices or systems. The WRAP, Bluegiga Access Server, Access Point and iWRAP are registered trademarks of Bluegiga Technologies. The Bluetooth trademark is owned by the Bluetooth SIG Inc., USA and is licensed to Bluegiga Technologies. All other trademarks listed herein are owned by their respective owners. Bluegiga Technologies Oy VERSION HISTORY Version Comment 1.0 Pra 1.1 MSa 2.0 Pra 2.1 Msa 2.2 Minor changes Bluegiga Technologies Oy TABLE OF CONTENTS WT32 Evaluation kit ..............................................................................................................................................1 Data Sheet ............................................................................................................................................................1 ...................................................................................................................1 1 Introduction ....................................................................................................................................................5 2 Physical outlook.............................................................................................................................................6 3 Schematics ....................................................................................................................................................7 4 Assembly .................................................................................................................................................... 13 5 Layout ......................................................................................................................................................... 14 6 Interfaces .................................................................................................................................................... 18 6.1 Power Supply ..................................................................................................................................... 18 6.2 Stereo Line Input and Output ............................................................................................................ 18 6.3 Microphone Input ............................................................................................................................... 18 6.4 SPI interface ...................................................................................................................................... 18 6.5 UART Interface .................................................................................................................................. 19 6.6 USB interface ..................................................................................................................................... 19 7 WEEE Compliance ..................................................................................................................................... 19 8 Contact Information .................................................................................................................................... 20 Bluegiga Technologies Oy 1 Introduction FEATURES  USB cable  Plantronics Stereo Headset  Evaluation kit for WT32 Bluetooth audio module containing   o 290 mAh Li-Pol battery with USB battery charger and a LED indicator o RS-232 serial interface with DTR button o USB interface o SPI for upgrading the firmware and parameters o Reset and 4 software configurable buttons o 3 x 2,5mm audio jacks for line in, line out and microphone o 16 pin I/O interface (PIO0 – PIO10, AIO0 – AIO1, PCM, UART, RESET, GND, 3V3) o Switchs for disabling RS232 driver and to connect a LED for PIO7 Configurable audio interface consisting o A mono electric microphone input o A fully differential audio input / output through a pin header o Differential audio input and output through stereo jack connectors iWRAP™ firmware Bluegiga Technologies Oy 2 Physical outlook Figure 1: WT32 evaluation kit, Onboard Installation Kit and headphones Bluegiga Technologies Oy 3 Schematics Figure 2: WT32 evaluation board schematic (1/6) Bluegiga Technologies Oy Figure 3: WT32 evaluation board schematic (2/6) Bluegiga Technologies Oy Figure 4: WT32 evaluation board schematic (3/6) Bluegiga Technologies Oy Figure 5: WT32 evaluation board schematic (4/6) Bluegiga Technologies Oy Figure 6: WT32 evaluation board schematic (5/6) Bluegiga Technologies Oy Figure 7: WT32 evaluation board schematic (6/6) Bluegiga Technologies Oy 4 Assembly Figure 8: WT32 evaluation kit assembly Bluegiga Technologies Oy 5 Layout Figure 9: Layout top layer Bluegiga Technologies Oy Figure 10: Layout second layer Bluegiga Technologies Oy Figure 11: Layout third layer Bluegiga Technologies Oy Figure 12: Layout bottom layer Bluegiga Technologies Oy 6 Interfaces 6.1 Power Supply The evaluation kit is powered from a 290 mAh lithium polymer battery. The battery can be charged through the USB interface. The charger starts when the 5 V is applied from the USB interface. 6.2 Stereo Line Input and Output Stereo line input and output are available on 3.5 mm jack connectors. 1 MΩ resistors R6 and R7 remove any voltage charge on the connector and helps to prevent clicks and pops occurring when plugging the headphone for the first time. R9 + C15 and R8 + C14 make a Zobel network. Its purpose is to tune out the inductance of the speaker coil and there by reduce cross over distortion. The value the components depend on the properties of the speaker coil and alternative values for the components may be required depending on the design. U10 and U11 convert unbalanced stereo line input to fully differential. Fully differential line input for the module provides high common mode noise rejection improving RF immunity. 6.3 Microphone Input Microphone takes the bias voltage from an external low noise regulator which is controlled by the mic_bias line of WT32. The microphone is connected differentially through SW2 to the left channel audio input of the module. 6.4 SPI interface SPI interface pin configuration is show in Table 2. The physical interface is 2X3 pin header. PIN name No. I/O Description MISO 1 O MISO 3.3 V 2 POWER 3.3 V power supply input CLK 3 I CLK MOSI 4 I MOSI CSB 5 I CSB GND 6 GND GND Table 1: SPI Interface PIN description Bluegiga Technologies Oy Page 18 of 20 6.5 UART Interface UART interface is connected to both I/O pin header and the RS232 driver. When using UART through I/O interface the RS232 driver can be set to high impedance using SW11. DTR button is connected to PIO5 through the DTR logic circuitry and a buffer. DSR is connected to PIO4. SW11 sets the DTR buffer to high impedance and thus when disabling RS232 interface through SW11, PIO5 can be configured to any purpose and used through the I/O interface. When you want to use the DTR signal, please refer to the iWRAP manual. 6.6 USB interface USB interface consists of the ESD protection circuit U2 and a voltage divider network R11 and R12 (refer to the datasheet of WT32). PIO8 is connected for the USB interface through SW13. 7 WEEE Compliance The crossed-out wheeled bin means that within the European Union the product must be taken to separate collection at the product end-of-life. Do not dispose of these products as unsorted municipal waste. Bluegiga Technologies Oy Page 19 of 20 8 Contact Information Sales: sales@bluegiga.com Technical support: support@bluegiga.com http://techforum.bluegiga.com Orders: orders@bluegiga.com WWW: www.bluegiga.com www.bluegiga.hk Head Office / Finland: Phone: +358-9-4355 060 Fax: +358-9-4355 0660 Sinikalliontie 5A 02630 ESPOO FINLAND Postal address / Finland: P.O. BOX 120 02631 ESPOO FINLAND Sales Office / USA: Phone: +1 770 291 2181 Fax: +1 770 291 2183 Bluegiga Technologies, Inc. 3235 Satellite Boulevard, Building 400, Suite 300 Duluth, GA, 30096, USA Sales Office / Hong-Kong: Phone: +852 3972 2186 Bluegiga Technologies Ltd. Unit 10-18 32/F, Tower 1, Millennium City 1 388 Kwun Tong Road Kwun Tong, Kowloon Hong Kong Bluegiga Technologies Oy Page 20 of 20