AN2422 STMPE2401 GPIO端口扩展器硬件接口指南

AN2422 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