The principle of the digital isolation chip is that when the digital signal and analog signal are transmitted in the electronic system, it has a high resistance isolation characteristic to achieve the isolation between the electronic system and the user, a chip that mostly uses optocoupler, magnetic isolation and capacitance isolation to achieve, but its power consumption, speed, isolation voltage and other aspects are often not optimal. Digital isolator is an electronic system, digital signals and analog signals are transmitted, so that it has a high resistance isolation characteristics, in order to achieve the isolation between the electronic system and the user of a chip.