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WT11-A

D e s i g n G u i d e

V e r s i o n 1 . 1

F r i d a y , S e p t e m b e r 3 0 , 2 0 0 5

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Summary of Contents for WT11-A

Page 1: ...WT11 A D e s i g n G u i d e V e r s i o n 1 1 F r i d a y S e p t e m b e r 3 0 2 0 0 5 ...

Page 2: ...ailed herein at any time without notice and does not make any commitment to update the information contained herein Bluegiga Technologies products are not authorized for use as critical components in life support devices or systems The WRAP is a registered trademark of Bluegiga Technologies The Bluetooth trademark is owned by the Bluetooth SIG Inc USA and is licensed to Bluegiga Technologies All o...

Page 3: ...Contents 1 Introduction 5 2 Design recommendations 6 2 1 PCB material 6 2 2 Grounding 6 2 3 Signal tracks 7 2 4 Filtering 7 2 5 Antenna 10 3 ...

Page 4: ...d TERMS ABBREVIATIONS Term or Abbreviation Explanation Bluetooth Set of technologies providing audio and data transfer over short range radio connections EMC Electromagnetic compatibility PCB Printed circuit board RF Radio frequency UART Universal Asynchronous Receiver Transmitter USB Universal Serial Bus 4 ...

Page 5: ...eness of the EMC design of a product is the only way to guarantee disturbance resistant products A day spent at the beginning of the project preventing EMC problems can save a month of fixing problems at the end Following chapters give several recommendations how to do a good design Nevertheless a designer should never copy and paste a reference design and expect it to work In the world of RF noth...

Page 6: ...move small floating islands after copper pour Do not place a ground plane underneath the antenna The grounding areas under the module should be designed as shown in Figure 1 Use conductive vias separated max 3 mm apart at the edge of the ground areas This prevents RF to penetrate inside the PCB Use ground vias extensively all over the PCB If you allow RF freely inside the PCB you have a potential ...

Page 7: ...ck in a ground has to find a path by circling around the gap and this results in a loop 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 2441 MHz You should make pads for two bypass capacitors near the 3V3 pin of the module One capacitor is from 10 nF to 100 nF The other one is meant to filter the RF and ...

Page 8: ...Figure 2 Filtering the supply lines L1 C6 C21 and L2 C4 C14 Figure 3 UART 8 ...

Page 9: ...Figure 4 USB Figure 5 An example of a good power supply design Figure 6 Audio design for WT11 9 ...

Page 10: ...rences and Gerber files which show how to design grounding around the module The following list can be used as a checklist for the design Place the WT11 module to the edge of the PCB Do not enclose the module in the metal shielding Do not place ground plane or traces underneath the antenna Do not place the antenna close to any metal objects Do not place wiring near the antenna Do not use very thin...

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