Wireless power transmitter implementing multiplexing for monitoring circuitry in a semiconductor device

A wireless power transmitter comprising a controller, the controller being configured to:

• cause a first pull down circuit of the wireless power transmitter to clamp a first transmission coil of a plurality of transmission coils to ground, the plurality of transmission coils being connected to the wireless power transmitter;
• cause a resistance of an attenuator of the wireless power transmitter to be set to a target resistance value;
• control a multiplexer of the wireless power transmitter to transition from a selection of the first transmission coil to a selection of a second transmission coil of the plurality of transmission coils for output by the multiplexer, the multiplexer being configured to output a signal based at least in part on the selection of the second transmission coil;
• cause a second pull down circuit of the wireless power transmitter to unclamp the second transmission coil from ground;
• cause the resistance of the attenuator to be progressively adjusted until a voltage of the signal is within a target voltage range;
• and
• receive monitoring data from a monitoring circuit of the wireless power transmitter, the monitoring circuit being configured to generate the monitoring data based at least in part on the signal.

A wireless power transmitter comprising:

• a plurality of transmission coils;
• and
• a semiconductor device comprising:
• a multiplexer, the transmission coils being connected to the multiplexer as inputs, the multiplexer being configured to select one of the transmission coils and output a signal based at least in part on the selected one of the transmission coils;
• an attenuator connected to the output of the multiplexer, the attenuator comprising a variable resistance;
• and
• a monitoring circuit connected to the output of the multiplexer and configured to measure at least one characteristic of the selected one of the transmission coils based at least in part on the signal output by the multiplexer.