PLEASE NOTE: This article is obsolete or related to a discontinued product.

DAISY-2-V2 - Stepper motor driver board

3 Ampere r.m.s bipolar stepper motor driver board based ST L6470 fully integrated microstepping motor driver with motion engine and SPI chip

The L6470, realized in analog mixed signal technology, is an advanced fully integrated solution suitable class='acmetable' 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 on-chip current sensing circuitry suitable class='acmetable' for non-dissipative 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.

Key features

  • Operating voltage: 8 - 45 V
  • 7.0 A out peak current (3.0 A r.m.s.)
  • Low RDS(on)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 of overtemperature protection

Daisy wirings

This board is pluggable on:

J3 pin-out

J3 Chip Function description
8 OUT1A Full-bridge A output 1
7 OUT2A Full-bridge A output 2
6 OUT1B Full-bridge B output 1
5 OUT2B Full-bridge B output 2
4 VSA/VSB Full-bridge A and B power supply
3 GND Bridge A and B power supply GND
2 SW External switch input pin
1 LED Led output for external led

SW1 dip-switch and P1 headers

This dip-switch selects which SPI CS use for this board and if send the SDO back to the SPI interface:

Signal description
1 Use SPI CS2
2 Use SPI CS1
3 Use SPI CS0
4 Send SPI SDO to the CPU

Stepper motor wirings

We tested the examples on this article with the following stepper motors:

Mercury NEMA-17 stepper motor SM-42BYG011-25

Wirings map:

J3 pins on DAISY-2-V2 Mercury wire colors Function description
1
2
3 GND power supply
4 VCC (12 volt) power supply
5 BLUE Bridge B output 2
6 YELLOW Bridge B output 1
7 GREEN Bridge A output 2
8 RED Bridge A output 1

Wantai NMEA-23 stepper motor 57BYG621

Wirings map:

J3 pins on DAISY-2-V2 Wantai wire colors Function description
1
2
3 GND power supply
4 VCC (12 volt) power supply
5 BLUE Bridge B output 2
6 RED Bridge B output 1
7 GREEN Bridge A output 2
8 BLACK Bridge A output 1

Schematic