Datasheet4U Logo Datasheet4U.com

AN1043 - Unique Features of the MCP23X08/17 GPIO Expanders

General Description

The I/O port is highly configurable for maximum flexibility.

Figure 1 is a simplified block diagram of an I/O port pin.

The port can either drive logic levels on the pin, or read logic levels from the pad.

Key Features

  • of the MCP23X08/17 GPIO Expanders Author: Pat Richards Microchip Technology Inc. I/O PORT.

📥 Download Datasheet

📁 Similar Datasheet

Part Number Description Manufacturer
AN1042 High Fidelity Switching Audio Amplifiers Using TMOS Power MOSFETs ON Semiconductor
AN1042D High Fidelity Switching Audio Amplifiers Using TMOS Power MOSFETs ON Semiconductor
AN1048 RC Snubber Networks ON Semiconductor
AN1048D RC Snubber Networks ON Semiconductor
AN1001 The Next Step in Surface-Mount Power MOSFETs Vishay Siliconix

Other Datasheets by Microchip Technology

Part Number Description
AN1096 Using the C30 Compiler to Interface SPI Serial EEPROMs

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
AN1043 Unique Features of the MCP23X08/17 GPIO Expanders Author: Pat Richards Microchip Technology Inc. I/O PORT DESCRIPTION The I/O port is highly configurable for maximum flexibility. Figure 1 is a simplified block diagram of an I/O port pin. The port can either drive logic levels on the pin, or read logic levels from the pad. The level on the pad can be read at any time, regardless if the pin is configured as an input or an output. The IODIR register controls the direction of the pins (input or output). More specifically, the IODIR registers simply enables/disables the output driver. When the driver is activated (IODIR = 0), the pad is driven to the state in the latch register (OLAT). When deactivated (IODIR = 1), the driver is high impedance.