With the touch technology in recent years, the popularity of different markets, all kinds of touch technology developed rapidly, particularly among the fastest growing capacitive touch applications. A1semi Following the resistive touch control chip widely used in mobile phone market after he launched a capacitive sensing touch button chip. Compared to traditional mechanical buttons and keys resistive touch, capacitive touch feel smooth, translucent touch screen, panel robust tolerance, dustproof, waterproof and anti-electromagnetic, light signals without interference, and low cost. 

      A1semi capacitive touch solutions AS9048 RC-based sampling theory, as shown, capacitance (C) consists of two parts: a fixed capacitor (electrode capacitance) and the sensing capacitor (when staff or close contact with the electrode, the capacitance caused by the staff) . Electrode capacitance should be as small as possible to ensure that staff detected touch. By measuring small changes in capacitance of the touch electrode to sense the body's capacitive touch sensors (buttons, scroll wheel or slider) touch.

 AS9048 The main features and advantages: 

1 chip memory bank for the FLASH, supports online updates;
2 internal 16MHz oscillator and WDT, 3.3V/5.5V voltage mode, can support up to 12Key touch keys independent testing;
3 high anti-jamming performance, can withstand the strong electromagnetic interference, can easily withstand 1GHZ RF wireless signal interference;
4 automatic intelligent power-saving mode, full-speed operation mode current <300uA;
5 automatic calibration and drift compensation;
6. KEY point area of ​​at least up to 3x3mm. 

Products in volume, and is widely used in induction cooker, electric heating, washing machines and other small household appliance market, because of its power and low power consumption, but also by LED TV / Monitor panel, DVD and other popular consumer electronics market. 

A1semi according to different customer needs evaluation boards and technical support services.