March 2015

DocID024501 Rev 2

1/16

16

AN4290

Application note

L647x, L648x and powerSTEP01 family communication protocol

Enrico Poli

Introduction

The L6470, L6472, L6474, L648x and powerSTEP01 devices provide advanced features

and high programmability. The devices are controlled by a host microcontroller through

a fast SPI interface compliant with the daisy chain configuration.

This document describes how the SPI communication protocol is implemented and it gives

some suggestions about the application design.

The features of the different parts and the current control algorithms (voltage mode driving,

predictive current control and auto-adjusted decay) are not investigated in this document.

Please refer to the respective application notes.

www.st.com