【通信应用笔记】STMPE2401 - 端口扩展键盘控制器 AN2423 Application note STMPE2401 - Port expander keypad controller Introduction STMPE2401 is the first in the family of STMicroelectronic’s expander logic products. The principle of a basic expander logic is the provision of additional I/Os that can be used by the host processor to implement additional features such as expanding the number of control signals and mixed signal lines or controlling numerous peripherals. In addition to t……