The RM1281A series chip has 1 to 4 touch key detection, which can be used to detect the touch action of the human hand on the external touch key. This series of chips has a high degree of integration, requiring fewer external components to achieve touch key detection.
    The RM1281A SOP8 package series chip has 3 touch keys for parallel output or 4 touch keys for serial output. The SOT23-6 package series chip has 1 or 2 touch keys to directly output the touch state. The chip has a high power supply voltage rejection ratio, which can reduce the occurrence of key detection errors, which ensures that the chip is still highly reliable in the application of adverse environmental conditions.
     The RM1281A series chip has a wide voltage operating range, low power operation mode, and features such as industrial operating temperature range, automatic calibration function to adapt to the environment, and anti-voltage fluctuations, which can provide a wide and easy touch button use scenario. It provides a simple and efficient implementation method for various touch-key applications.

Operating voltage: 2.2V~5.5V
Low standby current
Automatic calibration function
Automatically switch standby/work mode
It has the function of resisting voltage fluctuation
Supports serial and parallel output
Low voltage automatic reset function
Energy saving sleep mode
Industrial grade temperature range
The output can be selected as high or low effective
Reliable touch key detection
Sensitivity can be adjusted individually for each channel
Sensitivity can be adjusted by an external capacitor at the input end
Maximum keystroke output time detection