1. INTRODUCTION ..................................................................................................... 5
1.1 General Information ...................................................................................... 5
2. SYSTEM STARTUP ................................................................................................ 6
2.1 General Purpose Input / Output Pins (GPIO’s) ........................................... 8
2.1.1 No Digital I/O Configuration ................................................................... 9
2.1.1.1 Connect / Disconnect (GP5) ..................................................... 9
2.1.1.2 Possibilities with function 1 and function 2 ................................ 10
2.1.2 Four-pins Digital I/O configurations ........................................................ 13
2.1.2.1 Possibilities with function 1 and function 2 ................................ 13
2.1.3 Six-pins Digital I/O configurations .......................................................... 14
2.1.4 Diode Selection ..................................................................................... 15
2.2 Additional External Circuitry ....................................................................... 17
2.2.1 Oscillator Circuit ................................................................................... 17
2.2.2 Coils at the input of the USB ……......................................................... 18
2.2.3 Coils at the Vdd lines of the UDA1331H …............................................ 18
3. CONFIGURATION DATA STRUCTURE ................................................................. 19
3.1 Working with Dynamic Bass Boost (DBB) .................................................. 19
3.2 Working with Default Volume ...................................................................... 19
3.3 Product ID (idProduct) and Vendor ID (idVendor) ...................................... 19
4. CUSTOMIZING YOUR DESIGN .............................................................................. 20
4.1 Handling Device Configurations ................................................................. 20
4.2 Configuring the USB-APP……….................................................................. 20
4.3 The USB-I2C example driver ........................................................................ 21
5. USB CONTACT ADDRESS ..................................................................................... 22
6. GLOSSARY ............................................................................................................. 22
7. FREQUENTLY ASKED QUESTIONS ...................................................................... 23
8. REFERENCES ......................................................................................................... 27