ST STEVAL-WBC86TX - Page 73

4.13.2 Start and stop conditions..................................................39
4.13.3 Byte format ............................................................39
4.13.4 Interface protocol .......................................................39
4.13.5 Writing to a single register.................................................39
4.13.6 Writing to multiple registers with incremental addressing .........................40
4.13.7 Reading from a single register .............................................40
4.13.8 Reading from multiple registers with incremental addressing ......................41
4.14 GPIOx and INTB pins ..........................................................41
4.15 Interrupt registers .............................................................41
4.16 Frequency hopping (fhop) ......................................................42
4.17 PID tuning ...................................................................44
5 STEVAL-WBC86TX description and operation .....................................45
5.1 STWBC86 default configuration .................................................45
5.2 Typical performance characteristics ..............................................46
5.2.1 Power-up waveforms ....................................................46
5.2.2 Efficiency and spatial freedom in the XY plane .................................47
5.2.3 Efficiency and spatial freedom in the Z-axis ...................................48
5.2.4 Thermal performance ....................................................49
6 Designing a 5 W wireless power transmitter based on the STEVAL-WBC86TX
evaluation board..................................................................50
6.1 External component design .....................................................50
6.1.1 Coil selection...........................................................50
6.1.2 Series resonant capacitor selection..........................................50
6.1.3 Vin and Vinv capacitors selection ...........................................50
6.1.4 Hardware input protections ................................................50
6.2 Ring node voltage sensing......................................................51
6.3 PCB layout guidelines..........................................................51
6.4 Reference code with STM32 development boards ..................................52
6.4.1 Hardware requirements...................................................52
6.4.2 Hardware connections ...................................................52
6.4.3 Software requirements ...................................................53
6.4.4 Source files ............................................................53
6.4.5 Reference code porting procedure ..........................................53
6.4.6 API ..................................................................54
6.4.7 Error codes ............................................................54
7 Schematic diagrams ..............................................................55
8 Bill of materials...................................................................59
UM3161
Contents
UM3161 - Rev 1
page 73/78