PCA9554

The PCA9554 is an NXP CMOS device that provides 8 bits of general-purpose parallel input and output expansion for the I2C bus and the SMBus, in a 16-pin package. It is the smaller member of the NXP I2C I/O expander family, and it gives a small host eight extra ports that it can read or drive over the two-wire bus, with an interrupt output that tells the host when an input changes. The device includes an internal power-on reset, a set of configuration registers that make each port an input or an output, and a strong sink and source current that suits an LED or a small load. Three address pins allow up to eight expanders on one bus, so a designer can add I/O in blocks of eight where sixteen would be wasted, and the ESD protection and the industrial temperature range suit a control and a consumer application. The small 16-pin package keeps the board tight where only a few extra ports are needed. Typical applications include a consumer and an appliance product, an industrial control board and a small instrument that must add a few buttons, LEDs or control lines. Every device BeiLuo ships is factory-traceable and includes an import declaration, a certificate of origin and a RoHS compliance file. Our FAE team helps you choose the ports and plan the addressing and the pull-ups.