An apparatus, comprising: a plurality of programmable hardware resources (136, 250) disposed on an integrated circuit die; an analog-to-digital converter disposed on the integrated circuit die and configured to quantize values of one or more analog parameters of the integrated circuit die; a configuration control circuit disposed on the integrated circuit die and configured to, in response to a set of configuration data, program the programmable hardware resources (136, 250) to implement a set of circuits specified by the set of configuration data, and connect the analog-to-digital converter to respective nodes of the integrated circuit die for sampling the one or more analog parameters; and an interface circuit coupled to the analog-to-digital converter and configured to generate a control signal, based on quantized values of the one or more analog parameters from the analog-to-digital converter, and output the control signal to a power supply (110, 210) coupled to a power terminal (122, 222) of the integrated circuit die; wherein the analog-to-digital converter is configured to quantize at least one voltage of a power distribution node of the integrated circuit die; wherein the interface circuit is configured and arranged to: adjust the control signal based on a difference between the voltage quantized by the analog-to-digital converter and a target voltage; in response to the integrated circuit die being powered on, and prior to programming the programmable hardware resources (136, 250), store a first quantized value of the voltage of the power distribution node; after programming the programmable hardware resources (136, 250), store a second quantized value of the voltage of the power distribution node; and determine the target voltage based on a difference between the first and second quantized values. a plurality of programmable hardware resources (136, 250) disposed on an integrated circuit die; an analog-to-digital converter disposed on the integrated circuit die and configured to quantize values of one or more analog parameters of the integrated circuit die; a configuration control circuit disposed on the integrated circuit die and configured to, in response to a set of configuration data, program the programmable hardware resources (136, 250) to implement a set of circuits specified by the set of configuration data, and connect the analog-to-digital converter to respective nodes of the integrated circuit die for sampling the one or more analog parameters; and an interface circuit coupled to the analog-to-digital converter and configured to generate a control signal, based on quantized values of the one or more analog parameters from the analog-to-digital converter, and output the control signal to a power supply (110, 210) coupled to a power terminal (122, 222) of the integrated circuit die; wherein the analog-to-digital converter is configured to quantize at least one voltage of a power distribution node of the integrated circuit die; wherein the interface circuit is configured and arranged to: adjust the control signal based on a difference between the voltage quantized by the analog-to-digital converter and a target voltage; in response to the integrated circuit die being powered on, and prior to programming the programmable hardware resources (136, 250), store a first quantized value of the voltage of the power distribution node; after programming the programmable hardware resources (136, 250), store a second quantized value of the voltage of the power distribution node; and determine the target voltage based on a difference between the first and second quantized values. adjust the control signal based on a difference between the voltage quantized by the analog-to-digital converter and a target voltage; in response to the integrated circuit die being powered on, and prior to programming the programmable hardware resources (136, 250), store a first quantized value of the voltage of the power distribution node; after programming the programmable hardware resources (136, 250), store a second quantized value of the voltage of the power distribution node; and determine the target voltage based on a difference between the first and second quantized values.