NXP | PCA9502BS,128

The I/O expandable 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.

Features:

• 8 general purpose input/output expander/collector
• Replacement for PCF8574 with integrated 2-kbit EEPROM
• Internal 256 ´ 8 EEPROM
• Self timed write cycle (5 ms typical)
• 16 byte page write operation
• I2C-bus and SMBus interface logic
• Internal power-on reset
• Noise filter on SCL/SDA inputs
• Active LOW interrupt output

Applications:

• Board version tracking and configuration
• Board health monitoring and status reporting
• Multi-card systems in telecom, networking, and base station infrastructure equipment
• Field recall and troubleshooting functions for installed boards
• General-purpose integrated I/O with memory
• Replacement for PCF8574 with integrated 2-kbit EEPROM
• Bus master sees GPIO and EEPROM as two separate devices