Microcontroller having in-situ autocalibrated integrating analog-to-digital converter (IADC)

A microcontroller integrated circuit, comprising:

• an integrating analog-to-digital converter (IADC) having an in-situ autocalibration functionality;
• and
• a processor that executes instructions, wherein the processor reads a value output by the IADC, wherein autocalibration of the IADC is performed using an offset value and a scaling factor calculated by the processor, and wherein the IADC includes a counter that outputs a counter value, and wherein the value output by the IADC is determined by subtracting the offset value from the counter value.

A microcontroller integrated circuit, comprising:

• an integrating analog-to-digital converter (IADC) with a counter, wherein the IADC outputs an IADC output value, and wherein the IADC has an in-situ autocalibration functionality;
• and
• a processor that executes instructions, wherein the processor writes an initial count value into a first register, wherein the counter begins counting down from the initial count value, and wherein the processor reads the IADC output value from a second register.

A microcontroller integrated circuit, comprising:

• an integrating analog-to-digital converter (IADC), wherein an on-chip calibration function can be initiated periodically in the operating microcontroller integrated circuit between successive analog-to-digital conversions so that the IADC is recalibrated without using an external reference voltage to take into account changing parameters that affect the accuracy of the analog-to-digital conversions;
• and
• a processor that executes instructions, wherein the processor reads a value output by the IADC.

A microcontroller integrated circuit, comprising:

• an integrating analog-to-digital converter (IADC), wherein an on-chip calibration function can be initiated periodically in the operating microcontroller integrated circuit between successive analog-to-digital conversions so that the IADC is recalibrated to take into account changing parameters that affect the accuracy of the analog-to-digital conversions;
• and
• a processor that executes instructions, wherein the processor reads a value output by the IADC, wherein the IADC comprises a hardware correction circuit that includes a hardware adder, and wherein the hardware correction circuit is used to adjust a digital value output from a counter.

A microcontroller integrated circuit, comprising:

• an integrating analog-to-digital converter (IADC), wherein an on-chip calibration function can be initiated periodically in the operating microcontroller integrated circuit between successive analog-to-digital conversions so that the IADC is recalibrated to take into account changing parameters that affect the accuracy of the analog-to-digital conversions;
• and
• a processor that executes instructions, wherein the processor reads a value output by the IADC, and wherein the processor is used to adjust an initial count value from which a counter begins counting.