PCA9500 8-bit I2C-bus and SMBus I/O port with 2-kbit EEPROM Rev.
4.
1 — 5 May 2017 Product data sheet 1.
General description The PCA9500 is an 8-bit I/O expander with an on-board 2-kbit EEPROM.
The I/O expander's eight quasi-bidirectional data pins can be independently assigned as inputs or outputs to monitor board level status or activate indicator devices such as LEDs.
The system master writes to the I/O configuration bits in the same way as for the PCF8574.
The data for each input or output is kept in the corresponding Input or Output register.
The system master can read all registers.
The EEPROM can be used to store error codes or board manufacturing data for read-back by application ...

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