45.2: A Capacitive Touchscreen Controller IC with Noise‐based Hybrid Sensing Scheme

In this paper, it is presented a capacitive touch sensor IC with noise-based hybrid sensing scheme, which provides two sensing modes with noise detector. In noiseless environment, fast power-efficient peak-detection sensing mode is enabled and if noise is detected, the sensing mode is switched to high-SNR demodulation sensing mode. Therefore, it adaptively offers both fast sensing speed and high noise immunity without large power consumption. The proposed IC shows higher than 50-dB SNR in demodulation mode and over 240-Hz reporting rate in peak-detection mode with 2.8-mW analog power consumption, evaluated with 4-inch AMOLED panel with on-cell touch screen.