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Revision 1.0 Page 3 of 25
Headset Reference Design v1.0
Contents
1 Introduction .................................................................................................4
2 System Description .....................................................................................5
3 Hardware description ..................................................................................7
3.1 nRD24V1 Radio module ......................................................................7
3.1.1 Audio Codec.....................................................................................7
3.1.2 Micro controller.................................................................................8
3.1.3 Radio circuit .....................................................................................8
3.1.4 Antenna matching network...............................................................8
3.1.5 Power supply....................................................................................8
3.1.6 Programming....................................................................................8
3.1.7 Specifications...................................................................................9
3.2 Application board .................................................................................10
3.2.1 Audio interface .................................................................................10
3.2.2 Jumpers ...........................................................................................12
3.2.3 Antenna............................................................................................12
3.2.4 Power supply....................................................................................12
3.2.5 Buttons.............................................................................................13
3.2.6 Programming....................................................................................13
3.3 USB dongle ..........................................................................................14
3.3.1 USB Interface...................................................................................15
3.3.2 Micro controller.................................................................................15
3.3.3 Radio circuit .....................................................................................15
3.3.4 Power supply....................................................................................15
3.3.5 Programming....................................................................................15
3.3.6 Specifications...................................................................................16
4 Hardware design guidelines........................................................................17
4.1 Headset................................................................................................17
4.1.1 Antenna............................................................................................17
4.1.2 Interfaces .........................................................................................17
4.1.3 Crystals ............................................................................................18
4.1.4 MCU.................................................................................................18
4.1.5 Battery..............................................................................................18
4.2 USB dongle ..........................................................................................19
4.2.1 Antenna............................................................................................19
4.2.2 MCU.................................................................................................19
4.2.3 Crystals ............................................................................................19
5 Appendix .....................................................................................................20
5.1 Bill Of Materials (BOM) ........................................................................20
5.2 Application board schematics ..............................................................23
5.3 RF module schematics.........................................................................24
5.4 USB dongle schematics .......................................................................25