400 kHz I²C Expander IC, 28‑QFN Package
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The SX1509BIULTRT is an I²C expander IC manufactured by SEMTECH. This device provides GPIO expansion through the I²C communication protocol, operating at a maximum frequency of 400 kHz. It is housed in a compact 28-QFN package, making it suitable for space-constrained applications requiring additional digital input/output capabilities.
This I²C expander is commonly used in systems where the microcontroller or processor requires more digital I/O pins than are natively available. It finds applications in various embedded systems and control circuits.