Power-on-reset circuit and corresponding electronic device

An electronic device comprising:

• a power supply generator configured to provide a power supply voltage;
• a power-on-reset (POR) circuit comprising:
• a power supply input configured to receive the power supply voltage;
• a proportional to absolute temperature (PTAT) stage having a left branch and a right branch and configured to generate a current equilibrium condition between currents circulating in the left and right branches upon the power supply voltage reaching a POR detection level;
• an output stage, coupled to the PTAT stage and configured to generate a reset signal with a value switching at an occurrence of the current equilibrium condition for the PTAT stage;
• and
• a detection-level generation stage, coupled to the PTAT stage as a central branch thereof and configured to define the value of the POR detection level;
• and
• electronic circuitry, coupled to the POR circuit and configured to:
• receive the reset signal;
• activate a power-on sequence of operations when the reset signal switches to a first value;
• and
• stop operations when the reset signal switches to a second value.