BS814A-1 touch button module

This project is used to verify the module design of the Lichuang Mall touch chip/BS814A-1.

There is an onboard LED light to indicate the button status. The key detection of the chip is independent of each other, and there is no conflict among the 4 keys. After power-on, the chip will initialize and obtain the first reference value. Next, if no button is pressed within 1s in normal mode or 32s in standby mode, the touch chip will reset after a fixed time period. Automatically calibrate the reference value so that the reference value can dynamically change according to the external environment.

C3 to C6 are touch sensitivity adjustment capacitors, which can be left empty by default. The larger the adjustment capacitance, the lower the sensitivity.

The manual states that the operating voltage is 2.2V~5.5V, and the actual measurement is about 2.1V. The accuracy of the current power supply is too poor to give an exact value.

See the attachment for the test video.