The PCA9500PW 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 software for diagnostic purposes. The PCA9500 has 3 address pins with internal pull-up resistors allowing up to 8 devices to share the common two-wire I²C software protocol serial data bus. The fixed GPIO I²C-bus address is the same as the PCF8574 and the fixed EEPROM I²C-bus address is the same as the PCF8582C-2, so the PCA9500 appears as two separate devices to the bus master.
● Self-timed write cycle
● 4-byte Page write operation
● I²C-bus and SMBus Interface logic
● Internal power-ON reset
● Noise filter on SCL/SDA input
● 3 Address pins allowing up to 8 devices on the I²C-bus/SMBus
● No glitch on power-up
● Supports hot insertion
● Power-up with all channels configured as inputs
● Low standby current consumption
● Latch-up testing is done to JEDEC standard JESD78 which exceeds 100mA
