Current reference operative drive-sense circuit (DSC)

A current reference operative drive-sense circuit (DSC) comprising:

• a current source operably coupled to a load, wherein when enabled, the current source configured to drive a sinusoidal current reference signal to the load thereby generating a load voltage that is based on the sinusoidal current reference signal and an impedance of the load;
• a voltage-mode sigma delta analog to digital converter (ADC) operably coupled the load and to the current source, wherein when enabled, the voltage-mode sigma delta ADC configured to perform digital sampling of the load voltage and to generate a digital signal that is representative of the load voltage;
• memory that stores operational instructions;
• and
• one or more processing modules operably coupled to the voltage-mode sigma delta ADC and to the memory, wherein, when enabled, the one or more processing modules configured to execute the operational instructions to:
• process the digital signal that is representative of the load voltage to determine the load voltage;
• and
• determine the impedance of the load based on the load voltage and the sinusoidal current reference signal.

A current reference operative drive-sense circuit (DSC) comprising:

• a current source operably coupled to a touch screen capacitive load, wherein when enabled, the current source configured to drive a sinusoidal current reference signal to the touch screen capacitive load thereby generating a load voltage that is based on the sinusoidal current reference signal and an impedance of the touch screen capacitive load;
• a voltage-mode analog to digital converter (ADC) operably coupled the touch screen capacitive load and to the current source, wherein when enabled, the voltage-mode ADC configured to perform digital sampling of the load voltage and to generate a digital signal that is representative of the load voltage;
• memory that stores operational instructions;
• and
• one or more processing modules operably coupled to the voltage-mode ADC and to the memory, wherein, when enabled, the one or more processing modules configured to execute the operational instructions to:
• process the digital signal that is representative of the load voltage to determine the load voltage;
• and
• determine the impedance of the touch screen capacitive load based on the load voltage and the sinusoidal current reference signal.