Touchscreen Controller, Touchscreen System Including the Same, and Operating Method of the Touchscreen Controller

A touchscreen controller comprising:

• a first sample-and-hold (S/H) block configured to sample a plurality of capacitive touch inputs in response to a first sampling signal and to output samples of the sampled capacitive touch inputs in response to first output control signals;
• a second S/H block configured to sample a plurality of force touch inputs in response to a second sampling signal independent of the first sampling signal and to output samples of the sampled force touch inputs in response to second output control signals;
• and
• an analog-digital converter (ADC) shared by the first and second S/H blocks and configured to convert the samples of the capacitive touch inputs and the samples of the force touch inputs into digital signals.

A touchscreen system comprising:

• a touchscreen panel comprising a plurality of capacitive sensing electrodes configured to sense capacitive touches and a plurality of force sensing electrodes configured to sense force touches;
• and
• a touchscreen controller electrically connected to the capacitive sensing electrodes through a plurality of first channels and to the force sensing electrodes through a plurality of second channels, the touchscreen controller comprising:
• a first sample-and-hold (S/H) block configured to generate and store samples of a plurality of capacitive touch inputs received through the first channels responsive to a first sampling signal;
• a second S/H block configured to generate and store samples of a plurality of force touch inputs received through the second channels responsive to a second sampling signal;
• an analog-digital converter (ADC) shared by the first and second S/H blocks and configured to convert the stored samples of the capacitive touch inputs and the force touch inputs into digital signals;
• and
• a control signal generator configured to generating the first sampling signal and the second sampling signal.