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The CY8C95xxA is a multi-port IO expander with on board user available EEPROM and several PWM outputs. All devices in this family operate identically but differ in IO pins, number of PWMs,and internal EEPROM size.
The CY8C95xxA operates as two I2C slave devices. The first device is a multi port IO expander (single I2C address to access all ports through registers). The second device is a serial EEPROM. Dedicated configuration registers can be used to disable the EEPROM. The EEPROM uses 2-byte addressing to support the 28 Kbyte EEPROM address space. The selected device is defined by the most significant bits of the I2C address or by specific register addressing.
The IO expander's data pins can be independently assigned as inputs, outputs, quasi-bidirectional input/outputs or PWM ouputs. The individual data pins can be configured as open drain or collector, strong drive (10 mA source, 25 mA sink), resistively pulled up or down, or high impedance. The factory default configuration is pulled up internally.