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AN2422 STMPE2401 GPIO port expander Hardware interface guide

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STMPE2401 is the first in the ST family of I/O port expanders. The principle of a basic I/O port expander is that it provides additional I/Os that can be used by the host processor to implement additional features such as increased number of inputs/outputs, expanding the number of control signals and mixed signal lines, controlling a greater number of peripherals without resorting to an additional Complex Programmable Logic Device (CPLD) or upgrading the central processing unit (CPU).

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