CY8C9520A-24PVXI is a multi-port I/O expander with on board user available EEPROM and several PWM outputs. It operates as two I2C server devices. The first device is a multi port I/O 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 I/O expander's data pins can be independently assigned as inputs, outputs, quasi-bidirectional input/outputs or PWM outputs. The individual data pins can be configured as open drain or collector, strong drive, resistively pulled up or down, or high impedance. The factory default configuration is pulled up internally.