【通信应用笔记】STMPE2401 GPIO端口扩展器硬件接口指南 AN2422 Application note STMPE2401 GPIO port expander Hardware interface guide Introduction 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 peripher……