BOB-13752

L6470 Fully integrated microstepping motor driver with motion engine and SPI Datasheet - production data Applications Bipolar stepper motors Description The L6470 device, realized in analog mixed signal technology, is an advanced fully integrated POWERSO36 HTSSOP28 solution suitable for driving two-phase bipolar stepper motors with microstepping. It integrates a dual low R DMOS full bridge with all of the DS(on) Features power switches equipped with an accurate on- chip current sensing circuitry suitable for non- Operating voltage: 8 - 45 V dissipative current control and overcurrent 7.0 A out peak current (3.0 A ) r.m.s. protection. Thanks to a unique control system, a true 1/128 steps resolution is achieved. The Low R Power MOSFETs DS(on) digital control core can generate user defined Programmable speed profile and positioning motion profiles with acceleration, deceleration, Programmable power MOS slew rate speed or target position, easily programmed through a dedicated registers set. All commands Up to 1/128 microstepping and data registers, including those used to set Sensorless stall detection analogue values (i.e. current control value, SPI interface current protection trip point, deadtime, PWM frequency, etc.) are sent through a standard Low quiescent and standby currents 5-Mbit/s SPI. A very rich set of protections Programmable non-dissipative overcurrent (thermal, low bus voltage, overcurrent, motor protection on high and low-side stall) allows the design of a fully protected Two-levels of overtemperature protection application, as required by the most demanding motor control applications. Table 1. Device summary Order codes Package Packaging L6470H HTSSOP28 Tube L6470HTR HTSSOP28 Tape and reel L6470PD POWERSO36 Tube L6470PDTR POWERSO36 Tape and reel March 2015 DocID16737 Rev 7 1/73 This is information on a product in full production. www.st.comContents L6470 Contents 1 Block diagram 8 2 Electrical data 9 2.1 Absolute maximum ratings . 9 2.2 Recommended operating conditions 10 2.3 Thermal data 10 3 Electrical characteristics 11 4 Pin connection . 16 Pin list 17 5 Typical applications 19 6 Functional description 21 6.1 Device power-up . 21 6.2 Logic I/O 21 6.3 Charge pump 21 6.4 Microstepping 22 Automatic full-step mode 23 6.5 Absolute position counter . 23 6.6 Programmable speed profiles . 23 6.7 Motor control commands . 24 6.7.1 Constant speed commands 24 6.7.2 Positioning commands 24 6.7.3 Motion commands . 25 6.7.4 Stop commands . 25 6.7.5 Step-clock mode 26 6.7.6 GoUntil and ReleaseSW commands . 27 6.8 Internal oscillator and oscillator driver . 27 6.8.1 Internal oscillator 28 6.8.2 External clock source . 28 6.9 Overcurrent detection 29 2/73 DocID16737 Rev 7