The CJMCU-8591 is a monolithically integrated, individually powered, low power, 8-bit CMOS data acquisition device. The CJMCU-8591 has four analog inputs, one analog output and one serial I2C bus interface. The three address pins A0, A1 and A2 of the CJMCU-8591 can be used for hardware address programming, allowing access to eight CJMCU-8591 devices on the same I2C bus without additional hardware. In CJMCU-8591 device input and output of the address, control and data signals are through the two-way two-way I2C bus to serial transmission.