The present invention relates to a capacitive touch sensor, and relates to a touch sensor which precisely senses whether there is any touch, without using a reference
voltage or
reference current in the touch sensor but by converting data between neighboring channels into two types of data having different polarities and by comparing the same. The invention makes it possible to miniaturize a structure of the touch sensor and to ensure compatibility allowing application to a variety of touch panels by minimizing the influence of
noise from the outside environment. More specifically, the present invention provides a capacitive touch sensor comprising: at least one
receiver channel RX which outputs analog data of a
voltage for change in
capacitance caused by presence or absence of a
transmitter channel TX pulse impression and touch; at least one
receiver unit which is connected to the
receiver channel RX, receives the analog data of the
voltage, and outputs bipolar
pulse width modulation signals; a counter which periodically operates in accordance with reset RST signals; and at least one flip-flop which outputs, as
digital data, the bipolar
pulse width modulation signals input from the receiver unit, by using count values received from the counter.