Network sensing device and power management method thereof

A power management method, comprising:

• generating a trigger signal periodically by an active scheduling circuit, and the active scheduling circuit operating regularly;
• triggering the power management circuit of a sensor by the trigger signal to have the sensor being switched from a sleep mode to an active mode;
• collecting an environmental information through a sensor circuit of the sensor;
• and
• storing the environmental information and the sensor returning to the sleep mode.

A network sensing device, comprising:

• an active scheduling circuit, operating regularly;
• and
• a sensor, comprising:
• a power management circuit, coupled to the active scheduling circuit;
• a passive scheduling circuit, coupled to the active scheduling circuit;
• and
• a wireless radio circuit, coupled to the passive scheduling circuit;
• wherein a trigger signal generated by the active scheduling circuit periodically triggers the sensor to have the sensor being switched from a sleep mode to an active mode and updating a scheduling status of the passive scheduling circuit, the sensor circuit collects an environmental information in the active mode;
• and returns to the sleep mode after the environmental information is stored, and when the scheduling status satisfies a scheduling condition, the passive scheduling circuit enables the wireless radio circuit to have the sensor entering a broadcast mode.