Proximity sensing device

A proximity sensing device, comprising:

• a control module;
• a light-emitting module comprises a light-emitting element and a driver, the driver is coupled to the light-emitting element and the control module, the driver is driven by the control module to drive the light-emitting element to emit a detection light;
• a light receiving module configured to receive and covert an external light to a light sensing signal;
• an analog front-end module (AFE) coupled to the light receiving module through a first switch unit (SW1) to receive and convert the light sensing signal to an analog signal;
• an analog-to-digital converter (ADC) coupled to the analog front-end module and the control module through a fifth switch unit (SW5) to receive and convert the analog signal to an operation signal to the control module;
• a one cycle clock base analog-to-digital converter coupled to the analog front-end module and the control module through a sixth switch unit (SW6) to receive and convert the analog signal to a calibration signal to the control module;
• and
• an ambient light calibration digital-to-analog converter coupled to the light receiving module and the control module through a second switch unit (SW2), wherein
• the control module controls the first switch unit, the second switch unit, the fifth switch unit and the sixth switch unit to switch to close or open;
• the proximity sensing device enters an operation mode when the fifth switch unit is switched to close and the sixth switch unit is switched to open;
• and
• the proximity sensing device enters a calibration mode when the fifth switch unit is switched to open and the sixth switch unit is switched to close.