5.11.1 ASK communication .....................................................30
5.11.2 FSK communication .....................................................32
5.11.3 Most common Qi communication packets.....................................33
5.12 Adaptive rectifier configuration (ARC) mode .......................................34
5.13 I²C Interface ..................................................................35
5.13.1 Data validity ...........................................................36
5.13.2 Start and stop conditions..................................................36
5.13.3 Byte format ............................................................36
5.13.4 Interface protocol .......................................................36
5.13.5 Writing to a single register.................................................36
5.13.6 Writing to multiple registers with incremental addressing .........................37
5.13.7 Reading from a single register .............................................37
5.13.8 Reading from multiple registers with incremental addressing ......................37
5.14 GPIOx and INTB pins ..........................................................38
5.15 Interrupt registers .............................................................38
6 Schematic diagrams ..............................................................40
7 Bill of material (BOM) .............................................................41
8 STEVAL-WLC38RX description and operation .....................................43
8.1 STEVAL-WLC38RX coil description ..............................................43
8.2 STEVAL-WLC38RX PCB layout .................................................45
8.3 STWLC38 default configuration..................................................48
8.4 Typical performance characteristics ..............................................49
8.4.1 Power up waveforms.....................................................49
8.4.2 Efficiency and spatial freedom in the XY plane .................................50
8.4.3 Spatial freedom in the Z-axis...............................................51
8.4.4 Thermal performance ....................................................53
9 Designing a 5 W Qi BPP or 15 W Qi EPP wireless power receiver based on
STEVAL-WLC38RX evaluation board .............................................55
9.1 External component design .....................................................55
9.1.1 Coil selection...........................................................55
9.1.2 Series and parallel resonant capacitor selection ...............................55
9.1.3 VRECT and VOUT capacitor selection .......................................55
9.1.4 ASK modulation capacitor selection and configuration ...........................55
9.1.5 SOVP clamp resistor selection .............................................57
9.1.6 ESD/TVS diodes ........................................................57
9.1.7 NTC thermistor connection ................................................57
9.2 PCB layout guidelines..........................................................58
UM3154
Contents
UM3154 - Rev 2
page 76/81
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