Control circuit for wearable device, wearable device

A wearable device, comprising a control circuit for a wearable device, a communication module, and a power management module,

• wherein the control circuit comprises:
• a power supply circuit, a DC blocking circuit, and a voltage comparison circuit,
• wherein the power supply circuit is connected to a high voltage end, a low voltage end, a first signal input end, a second signal input end, a first node, and a second node;
• the power supply circuit is configured to output a voltage of the first signal input end to the first node and to output a voltage of the second signal input end to the second node according to voltages supplied by the high voltage end and the low voltage end;
• the DC blocking circuit is connected to the first node, the second node, and a sensor in the wearable device, and is configured to block DC signals on the first node and the second node from flowing to the sensor, and to cause AC signals on the first node and the second node to flow to the sensor;
• the voltage comparison circuit is connected to the first node, a reference voltage end, and an output end, and is configured to compare voltages of the first node and the reference voltage end;
• and to output a first control signal through the output end when the voltage of the first node is smaller than the voltage of the reference voltage end, and to output a second control signal through the output end when the voltage of the first node is larger than the voltage of the reference voltage end,
• wherein an output end of the voltage comparison circuit in the control circuit is connected to a power management module, and the power management module is connected to the communication module;
• the power management module is configured to convert the communication module from a sleep state to an operating state according to the first control signal output by the voltage comparison circuit;
• and is further configured to convert the communication module from the operating state to the sleep state according to the second control signal output by the voltage comparison circuit.