Abstract: An integrated circuitry includes a first circuit, a second circuit, and a voltage conversion circuit. A first power supply positive terminal of the first circuit is electrically coupled to a power source. The second circuit is electrically coupled in series with the first circuit and the power source. A second power supply positive terminal of the second circuit is electrically coupled to a first power supply negative terminal of the first circuit. The voltage conversion circuit is electrically coupled between the first circuit and the second circuit so as to receive a signal from the first circuit or the second circuit. The voltage conversion circuit converts a voltage value of the signal according to a first low potential signal of the first power supply negative terminal and a second low potential signal of a second power supply negative terminal.