JL8022S-B touch sensing IC is an integrated circuit designed to realize human touch interface. It can replace the mechanical light touch button to realize waterproof and dustproof, sealed isolation, strong and beautiful operation interface. Touch switch control can be realized using this chip. The peripheral circuit required by the scheme is simple and easy to operate. After determining the sensitivity and selecting the capacitor, the IC can automatically overcome various disturbances caused by ambient temperature, humidity, surface debris, etc., and avoid button differences caused by resistance and capacitance errors.

Basic Features

High sensitivity (can be adjusted by the user)

High waterproof performance

Low standby power consumption, power saving

High anti-interference performance, touch response sensitivity and reliability are not affected in the case of close-range and multi-angle mobile phone interference

Button sensor pad size: greater than 3mm×3mm, depending on different panel materials and thicknesses

Button sensor pad spacing: greater than 2mm

The shape of the key sensor pad: any shape (the contact area with the panel must be guaranteed)

Key sensor pad material: PCB copper foil, metal sheet, flat top cylindrical spring, conductive rubber, conductive ink, ITO layer of conductive glass, etc.

Panel material: insulating materials, such as plexiglass, ordinary glass, tempered glass, plastic, wood, paper, ceramics, stone, etc.

Panel thickness: 0-12mm, different according to different panel materials

Working temperature: -20℃-85℃

Working voltage: 2.7V-5.5V

Package Type: SOP8

Application areas: touch desk lamp, touch atomizer, touch flashlight, etc.

Pin layout

Application Notes

Reference schematic

Note: 1. When the material and thickness of the medium differ greatly, the touch sensitivity can be adjusted by adjusting the value of the C2 sampling capacitor. The larger the capacitance value, the higher the sensitivity; the smaller the capacitance value, the lower the sensitivity.

2. The PIN1 pin must be connected to a fixed state to ensure the normal operation of the function and increase the anti-interference.

Function description

The initial output state of LO1 and LO2 after power-on is determined by the input state of OSC before power-on; OSC pin is connected to VDD (high level) for power-on, LO1 and LO2 output high level after power-on; OSC pin is connected to GND (Low level) Power on, LO1 and LO2 output low level after power on. TI1 touch input corresponds to LO1 logic output, TI2 touch input corresponds to LO2 logic output. Each time TI1 or TI2 is touched, the output state of the corresponding LO1 or LO2 is flipped once. so cycle.

Key operation method

In the production process, when the key is exposed to the air, if you directly touch the metal spring of the key with your finger, because the human body is connected to the ground, there will be 50Hz power frequency interference entering the chip, which may cause the key or key to not be detected. Continuous response.

The correct keystroke method is:

1. Put a piece of thin glass (about 4mm) on the spring;

2. Touch with pencils, screwdrivers, etc.;

3. Touch with fingernails.

waterproof mode

JL8022S-B chip has built-in waterproof working mode. In waterproof mode, no matter the panel is splashed, flooded or even completely submerged in water, the keys can respond correctly and quickly. It is different from the current general induction buttons that are prone to malfunction when the panel is splashed or flooded, and the response is slow or mis-responsive after the water accumulates.

Sensitivity adjustment capacitor

The second pin of the chip is the sensitivity adjustment capacitor input port. The user can adjust the sensitivity of all touch buttons by adjusting the capacitance value of the VC port. The adjustment range is recommended to be 102-103. The user should try to use polyester with an accuracy of 5%. capacitance. Increasing the capacitance will increase the sensitivity and reduce the anti-interference ability; conversely, reducing the capacitance will reduce the sensitivity and enhance the anti-interference ability.

The value of the capacitance is related to the PCB wiring, the material and thickness of the panel, etc. In the application, appropriate adjustments should be made according to the actual plan to optimize the touch effect.