Scheme description：

Human body induction cabinet light is a kind of lamp controlled by infrared induction switch, just open the door or wave the hand and other actions can easily illuminate, close the cabinet door can be extinguished, is a kind of convenient and energy-saving equipment in life.

Function description：

Function is controlled by HS6604 chip. After being powered on, REL will be lowered for 2s(2s on), and then enter the normal working mode after a 3.5s high resistance state blockade time:REL is high resistance state when there is no person (the light is not on);If human movement is detected, REL is lowered (the light is on), the timing lasts for 30 seconds, and the trigger can be repeated;The maximum driving current of REL foot is 200mA.

The HS6604 also has a built-in charge management chip,a single lithium-ion battery can be charged directly from a USB port,the maximum charging current can be adjusted to 300mA,MOSFET、detection resistors or isolation diodes are not required,ensure charging speed without risk of overheating,accuracy reaches ±1% (±42mV) of 4.2V preset charging voltage.CHRG port indicates charging status,When in the charging cycle, the strong pull-down state is effective, and the light is on;Once the charging cycle is terminated or filled, the light goes out.

There are several advantages in making charging night light scheme with HS6604：

1. Extremely low power consumption,standby current of induction state is only 20UA, and peripheral components are simple

2. External three-terminal voltage regulator can be omitted,HS6604 can directly supply voltage regulator to the probe

3. It can save the driving triode /MOS tube, and the maximum driving current of HS6604 can reach 200mA

4. The charge management chip can be dispensed with, and a single lithium-ion battery can be charged directly from the USB port through the HS6604

A chip + analog probe can realize all functions of human sensing small night light

Schematic diagram：

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