Product model: IS220PAICH1A
Manufacturers: General Electric, GE Industrial Systems, USA
Model Type: Analog I/O package
Power Supply: Minimum 27.4 VDC, nominal 28.0 VDC and maximum 28.6 VDC
IS220PAICH1A Analog I/O, that is, analog input/output, involves signals carried by analog quantities. In the Arduino controller, the pins with an “A” in front of the number are analog input pins, and the Arduino can read the analog value input on these pins, that is, the voltage input on the pin is read. The analog signal is the information expressed by the continuous change of physical quantity, and the signal changes continuously at any time, such as the change of sound, temperature, etc.

In Arduino, IS220PAICH1A analog input pin is a pin with ADC (analog-to-digital converter) function, which can convert the external input analog signal into a digital signal that can be recognized when the chip is operating, so as to realize the function of reading the analog value. The Arduino analog input function has a 10-bit precision, that is, it can convert the voltage signal from 0 to 5V into an integer representation from 0 to 1023. The analog input function requires the analogRead() function, for example analogRead(A0) reads the analog value on the A0 pin.

The analog input function corresponds to the analog output function. Although Arduino does not have a real analog output pin, you can use the analogWrite() function to approximate the analog output value in the form of pulse-width modulation (PWM). This function specifies the pin to output the PWM wave and the pulse width of the PWM, ranging from 0 to 255.

In addition, IS220PAICH1A analog I/O is also used in virtualization technologies, such as full virtualization, paravirtualization, and hardware-assisted virtualization in I/O virtualization, which simulates I/O devices or functions to achieve virtualization.