通过的I2C/SMBus实现方便的并行I / O扩展或接收 NXP octal SMBus registered interface PCA9557 Convenient parallel I/O expansion or collection via the I2C/SMBus This exible device ofoads the I/O controller in a range of system-management applications. It uses the I2C/SMBus for I/O expansion or collection, supports unique resets, enables chipset-to- peripheral interfaces, and can be used to send alert signals to LEDs. Features The PCA9557 has its own reset pins, so its I/O can be reset Supports SMBus or I2C-bus I/O expansion and collection without taxing the I/O controller’s GPIO. This is especially Supports simple BIOS implementation via f……