November 2010 Doc ID 16737 Rev 2 1/64
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L6470
Fully integrated microstepping motor driver
with motion engine and SPI
Features
■ Operating voltage: 8 - 45 V
■ 7.0 A output peak current (3.0 A r.m.s.)
■ Low R
DSon
power MOSFETS
■ Programmable speed profile and positioning
■ Programmable power MOS slew-rate
■ Up to 1/128 microstepping
■ Sensorless stall detection
■ SPI interface
■ Low quiescent and standby currents
■ Programmable non dissipative overcurrent
protection on high and low-side
■ Two levels overtemperature protection
Applications
■ Bipolar stepper motor
Description
The L6470, 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 R
DSon
DMOS full bridge
with all of the power switches equipped with an
accurate on chip current sensing circuitry suitable
for non dissipative current control and overcurrent
protections. 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, dead time, PWM
frequency etc.) are sent through a standard
5Mbit/s SPI.
A very rich set of protections (thermal, low bus
voltage, overcurrent, motor stall) allows designing
a fully protected application, as required by most
demanding motor control applications.
HTSSOP28
Table 1. Device summary
Order codes Package Packing
L6470H HTSSOP28 Tube
L6470HTR HTSSOP28 Tape and reel
www.st.com
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