The PCAL9538A is a versatile 8-bit GPIO expander designed for I²C-bus and SMBus applications, enabling the addition of extra input/output capabilities to a system. Supporting a wide operating voltage range of 1.65 V to 5.5 V, it features integrated interrupt and reset capabilities, high-current LED drive support, and the ability to share an I²C bus with up to four devices. Beyond standard GPIO functionality, the PCAL9538A offers advanced Agile I/O features that enhance flexibility, reliability, and overall system performance.
The PCAL9538A is a pin-to-pin replacement for the PCA9538 while providing enhanced functionality and improved startup behavior.
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