The L6470 device， realized in analog mixed signal technology， is an advanced fully integrated solution suitable for driving two-phase bipolar stepper motors with microstepping. It integrates a dual low RDS（on） DMOS full bridge with all of the power switches equipped with an accurate onchip current sensing circuitry suitable for nondissipative current control and overcurrent protection. Thanks to a unique control system， a true 1/128 steps resolution is achieved. The digital control core can generate user defined motion profiles with acceleration， deceleration， speed or target position， easily programmed through a dedicated registers set. All commands and data registers， including those used to set analogue values （i.e. current control value， current protection trip point， deadtime， PWM frequency， etc.） are sent through a standard 5-Mbit/s SPI. A very rich set of protections （thermal， low bus voltage， overcurrent， motor stall） allows the design of a fully protected application， as required by the most demanding motor control applications.