PCA9555 series datasheets. Manufacturer: Philips Semiconductors.

PCA9555 16-bit I2C and SMBus I/O port with interrupt Datasheet*) PCA9555BS 16-bit I2C and SMBus I/O port with interrupt Datasheet*) PCA9555D 16-bit I2C and SMBus I/O port with interrupt Datasheet*) PCA9555DB 16-bit I2C and SMBus I/O port with interrupt Datasheet*) PCA9555N 16-bit I2C and SMBus I/O port with interrupt Datasheet*) PCA9555PW 16-bit I2C and SMBus I/O port with interrupt Datasheet*) There are other manufacturers for this components. For more information please check PCA9555 (Texas Instruments)

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