Internal voltage monitoring for integrated circuit devices

A system comprising:

• an integrated circuit (IC) chip that includes:
• an integrated voltage regulator circuit that is configured to provide an internal supply voltage to the IC chip;
• a test control interface that is configured to:
• receive a test mode signal from an external pin of the IC chip;
• and
• write, in response to the test mode signal, a value to a test mode register;
• an analog to digital converter (ADC) circuit that, in response to the value written to the test mode register, is configured to:
• measure, in an analog domain and over a plurality of sample-and-hold windows that are part of a measurement window, voltage characteristics of the internal supply voltage to produce an analog held value;
• and
• convert, upon completion of the measurement window, the analog held value to a digital value;
• and
• a memory circuit and memory interface circuit that are configured to:
• store the digital value in the memory circuit;
• and
• provide the digital value from the memory circuit to a reader device external to the IC chip.

A system comprising:

• an integrated circuit (IC) chip that includes:
• an integrated voltage regulator circuit that is configured to provide an internal supply voltage to the IC chip;
• a test control interface that is configured to:
• receive a test mode signal from an external pin of the IC chip;
• and
• write, in response to the test mode signal, a value to a test mode register;
• an analog to digital converter (ADC) circuit that, in response to the value written to the test mode register, is configured to:
• detect a peak voltage of the internal supply voltage;
• detect a minimum voltage of the internal supply voltage;
• and
• determine an average voltage of the internal supply voltage;
• and
• a memory circuit and memory interface circuit that are configured to:
• store values representing the determined peak voltage, minimum voltage, and average voltage;
• and
• provide the stored voltages from the memory circuit to a reader device external to the IC chip.