MCP23S17-E/SP

I/o Expanders Overview

The MCP23S17-E/SP is a 16-bit remote bidirectional I/O port expander featuring an SPI interface. It operates within a supply voltage range of 1.8V to 5.5V and supports clock frequencies up to 10 MHz. The device provides 16 general-purpose I/O pins, functionally divided into two 8-bit ports (PORTA and PORTB). It includes configurable interrupt output pins (INTA and INTB) that can be set as active-high, active-low, or open-drain. The component is housed in a 28-pin SPDIP package and is qualified under AEC-Q100 standards.

I/o Expanders Feature Summary

• Supports high-speed serial communication via the SPI protocol with hardware address decoding for multi-device bus configurations.
• Features configurable interrupt outputs that trigger on input state changes or deviations from default register values.
• Includes internal weak pull-up resistors and polarity inversion registers for flexible input signal management.

I/o Expanders Applications

• Expanding GPIO capacity in resource-constrained embedded systems
• Industrial control interfaces requiring reliable digital I/O expansion
• Automotive electronic modules utilizing AEC-Q100 qualified components

I/o Expanders Procurement Notes

Verify the specific suffix 'SP' corresponds to the 28-pin Shrink Small Outline Dual In-line Package (SPDIP) during procurement. Confirm that the '-E' designation indicates compliance with extended industrial temperature ranges. Ensure the selected variant matches the required packaging format for the target assembly process.

I/o Expanders Selection Notes

Select this model when an SPI interface is preferred over I2C to reduce pin count or increase data throughput. Verify that the host microcontroller supports the required SPI modes and voltage levels. Consider the physical dimensions of the 28-pin SPDIP package against available PCB real estate constraints.

I/o Expanders Part Context

This component belongs to the MCP23X17 family, which also includes the I2C-based MCP23017. While sharing identical register maps and functional capabilities, the MCP23S17 utilizes a serial peripheral interface instead of the inter-integrated circuit protocol. This distinction dictates the necessary host controller interface configuration and wiring topology.

I/o Expanders Replacement Considerations

The MCP23017 serves as a functional equivalent but requires an I2C interface. Direct substitution necessitates verifying that the host system supports I2C communication and that the PCB layout accommodates SDA and SCL lines rather than MOSI, MISO, and SCK.