W Audio DSR 12A User Manual

WT12-A Design Guide Version 1.1 Wednesday, September 12, 2007

9 Figure 4: Audio design for the WT12 bluetooth module 3.2 UART interface UART interface of WT12 uses voltage levels of 0V and Vdd. Thus an externa

10 Figure 5: Example of an UART implementation for WT12 3.3 USB interface Figure 6 shows an example of how to connect the USB interface of WT12. Tr

11 Figure 6: Example of an USB interface circuitry 3.4 PCB Following picture shows an example of a good PCB design. The module is placed at the ed

12 Figure 7: Design example (WT12 Evaluation Kit)

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Copyright © 2005 Bluegiga Technologies All rights reserved. Bluegiga Technologies assumes no responsibility for any errors, which may

2 Contents: 1. Introduction... 4 2. Design recomm

3 VERSION HISTORY Version: Author: Comments: 1.1 Pasi Rahikkala Example designs added 1.0 Teemu Ruokokoski First release 9.9.2005 TERMS & AB

4 1. INTRODUCTION This guide gives recommendations how to design electronics around WRAP THOR WT12-A module. EMC issues are considered in chapter 2

5 2. DESIGN RECOMMENDATIONS 2.1 PCB material A multilayer (for example 4-layer) PCB is recommended. A good grounding is always available in a multi

6 Figure 1: Ground areas under the WT12-A module (green color is layer 1 copper and light blue is layer 2 copper) 2.3 Signal tracks • Routing sho

7 2.4 Filtering Always use high-Q components! Use filtering especially on supply lines. A special care should be taken to filter RF frequencies at 2

8 2.5 Antenna WT12-A module has an internal antenna which makes the module easy to integrate into a product. Nevertheless, to ensure proper operatio