Multi-mode sensor, system-on-chip comprising the same and multi-mode sensing method thereof

A multi-mode sensing method of a sensor mounted on a system-on-chip, comprising:

• receiving one of a plurality of sensing modes;
• generating at least one of a clock signal, a step pulse signal, and a window signal according to the received sensing mode;
• generating short pulses that are triggered by the clock signal or the step pulse signal to propagate through a plurality of delay elements;
• selecting delay clock signals delayed by the plurality of delay elements by a pulse width of the window signal;
• and
• counting and outputting a number of the selected delay clock signals.

A system-on-chip, comprising:

• a central processing unit;
• and
• a multi-mode sensor configured to execute one of a plurality of sensing modes according to a sensing mode provided from the central processing unit and output an execution result of the one of the sensing modes as an output signal,
• wherein the multi-mode sensor comprises:
• a pulse generator configured to generate at least one of a clock signal, a step pulse signal, and a window signal according to the sensing mode;
• a delay chain configured to select and output delay clock signals that are transmitted through each of a plurality of delay elements by being triggered by the clock signal or the step pulse signal as much as a pulse width of the window signal;
• and
• an adder configured to count a number of the selected delay clock signals to output the number of the selected delay clock signals as the output signal,
• wherein the plurality of sensing modes include a jitter sensing mode for sensing jitter of the clock signal, a processor corner sensing mode for sensing a processor corner of the plurality of delay elements, and a duty ratio sensing mode for sensing a duty ratio of the clock signal.