Audio-specific Bluetooth WT32i reference design

WT32i is an audio-specific Bluetooth 3.0 module with excellent RF performance and enhanced audio capabilities for a first-class Bluetooth audio experience. In addition to the certified Bluetooth radio and software stack, the WT32i includes a DSP, stereo audio codec and battery charger, making it ideal for fixed and portable audio applications. The WT32i includes Bluegiga's iWRAP6 Bluetooth stack software that implements A2DP, AVRCP v.1.5 profiles and supports aptX® and AAC audio codecs for stereo audio applications. For hands-free applications, iWRAP6 software also supports HFP v.1.6, HSP, MAP and PBAP as well as CVC® echo cancellation software. For data communication with Android and iOS applications, iWRAP6 also implements Bluetooth Serial Port Profile (SPP) and Apple iAP profile. The WT32i is an ideal solution for developers who want to quickly integrate the latest Bluetooth audio technology without the time and cost typically involved in Bluetooth audio chipset design.

Article directory

TABLE OF CONTENTS
1 Introduction
2 Hardware Design of DKWT32i v2
2.1 Choosing the Capacitors and Resistors Used in the Audio Path 
2.2 How to Avoid Pops and Cracks When Powering the Board or Establishing A2DP connection
2.3 Schematic and Assembly of DKWT32i v2 
2.4 Layout of DKWT32i
2.5 RF, EMC and Audio Layout Considerations