Multiple choice technology embedded technologies

CY8C20434 is a Touch Sensor based Microcontroller that has 23 I/O's . After designing the inputs and outputs how it really works when a finger is placed on PCB Board of CY8C20434(Touch Sensor)?

  1. Resistance is generated

  2. Inductance is generated

  3. Capacitance is generated

  4. Current is generated
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Capacitive touch sensors like the CY8C20434 work by detecting changes in capacitance when a finger touches the PCB. The human body acts as a capacitor, and when placed near the sensor electrodes, it changes the capacitance of the circuit, which the microcontroller detects as a touch event. Option C is correct.

AI explanation

The CY8C20434 is a PSoC-based capacitive touch-sensing microcontroller (Cypress CapSense family). Each I/O pin configured as a touch sensor acts as one plate of a capacitor; when a finger — which is conductive and grounded relative to the board — approaches or touches the PCB sensor pad, it changes the effective capacitance of that sensing node. The microcontroller's CapSense circuitry measures this capacitance shift (via charge-time or relaxation-oscillator methods) to detect the touch. Resistance, inductance, and current changes aren't the physical mechanism this chip's sensing technology relies on — capacitive sensing is specifically what "CapSense" and this touch-controller family are built around.

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