Abstract

The SPI interface provides synchronous data transfer used for short distance high-speed communication. Frame by frame, the SPI interface exchanges data between master devices and slave devices. In industrial applications, a common example of a SPI master would be a microcontroller where an example of a SPI slave might be a robotic arm or mechanical relay. As SPI is full duplex and can communicate simultaneously in both directions the production speed can be increased allowing for more autonomous communication. In this application note, we discuss the advantages of this configuration and how this communication method can be integrated into a design using TI’s Smart High Side Switches. A reference hardware design and various software snippets are provided in this application note to demonstrate a simple and practical example of how to enable the SPI interface on a TI high side switch with minimal external components. This application note is provided with a supplementary support package which includes the gerber files of the referenced SPI expander implementation as well as an example software implementation for the CC2652R microcontroller.

The software package contains all of the collateral listed in this application note.