Control circuit of electrostatic capacitive sensor and electronic device using the same

A control circuit of an electrostatic capacitive sensor including a plurality of transmitter electrodes disposed in parallel in a first direction and a plurality of receiver electrodes disposed in parallel in a second direction, and spaced apart from the plurality of transmitter electrodes by specific intervals, the control circuit comprising:

• a transmitter circuit configured to apply a periodical transmission signal to each of the plurality of transmitter electrodes;
• a receiver circuit configured to generate, based on a reception signal generated in each of the plurality of receiver electrodes in response to the transmission signal, a detection signal indicating a change in electrostatic capacitance formed at each of intersections of the plurality of transmitter electrodes and the plurality of receiver electrodes;
• and
• a controller configured to control operation modes of the transmitter circuit and the receiver circuit,
• wherein the transmitter circuit is configured to switch between a first mode, where the transmission signal is sequentially applied to the plurality of transmitter electrodes, and a second mode, where the plurality of transmitter electrodes are grouped into one or more groups and the transmission signal is simultaneously applied to transmitter electrodes belonging to the same group,
• wherein the receiver circuit is configured to switch between a first mode, where the reception signal generated in each of the plurality of receiver electrodes is sequentially monitored to generate the detection signal for each of the receiver electrodes, and a second mode, where the plurality of receiver electrodes are grouped into one or more groups and receiver electrodes belonging to the same group are connected in common to generate the detection signal for each group, and
• wherein the controller switches between a first condition, where the transmitter circuit and the receiver circuit are fixedly set to the first mode, and a second condition, where the transmitter circuit and the receiver circuit are set to alternate between the first mode and the second mode in a time-divisional manner.