ST EVAL6470PD User Manual

EVAL6470PD

Fully integrated stepper motor driver mounting the L6470 in a high

power PowerSo package

Data brief − preliminary data

Features

■ Voltage range from 8 V to 45 V

■ Phase current up to 3 Ar.m.s.

■ Dual SPI connector (daisy-chain configuration

suitable)

■ SW input

■ FLAG and BUSY LED indicators

■ Adjustable supply voltage compensation

■ High thermal performance (R

typical)

■ Suitable for use in combination with the

STEVAL-PCC009V2

12 °C/W

thj-a

Description

The EVAL6470PD demonstration board is a fully integrated microstepping motor driver. In combination with the STEVAL-PCC009V2 communication board and dSPIN evaluation software, the board allows the engineer to investigate all the features of the L6470 device. In particular, the board can be used to check the voltage mode driving and to regulate the L6470 parameters in order to fit the application requirements. The 4-layer layout and the PowerSO package allow the top thermal performance to be obtained. The EVAL6470PD supports the daisy-chain configuration making it suitable for the evaluation of the L6470 in multimotor applications.

AM11329v1

May 2012 Doc ID 022606 Rev 2 1/12

This is preliminar y information on a new product now in development or undergoing evaluation. Details are subject to change without notice. For further information contact your local STMicroelectronics sales office.

www.st.com

Board description EVAL6470PD

1 Board description

Table 1. EVAL6470PD specifications

Parameter Value

Supply voltage (VS) 8 to 45 V

Maximum output current (each phase) 3 A

Logic supply voltage (VREG)

Logic interface voltage (VDD)

r.m.s.

Externally supplied: 3.3 V internally supplied: 3 V typical

Externally supplied: 3.3 V or 5 V internally supplied: VREG

Low level logic input voltage 0V

High level logic input voltage VDD

(1)

Operating temperature -25 to +125 °C

L6470PD thermal resistance junction-to-ambient 12 °C/W typical

1. All logic inputs are 5 V tolerant.

Figure 1. Jumper and connector location

2/12 Doc ID 022606 Rev 2

AM11330v1

EVAL6470PD Board description

Table 2. Jumper and connector description

Name Type Function

M1 Power supply Motor supply voltage

M2 Power output Bridge A outputs

M3 Power output Bridge B outputs

CN1 SPI connector Master SPI

CN2 SPI connector Slave SPI

CN3 NM connector OSCIN and OSCOUT pins

CN4 NM connector External switch input

TP1 (VS) Test point Motor supply voltage test point

TP2 (VDD) Test point Logic interface supply voltage test point

TP3 (VREG) Test point Logic supply voltage/L6470 internal regulator test point

TP5 (GND) Test point Ground test point

TP6 (GND) Test point Ground test point

TP8 (STCK) Test point Step clock input test point

TP9 (STBY/RES) Test point Standby/reset input test point

TP10 (FLAG) Test point FLAG output test point

TP11 (BUSY/SYNC) Test point BUSY/SYNC output test point

Table 3. Master SPI connector pinout (J10)

Pin number Type Description

1 Open drain output L6470 BUSY/SYNC output

2 Open drain output L6470 FLAG output

3 Ground Ground

4 Supply EXT_VDD (can be used as external logic power supply)

5 Digital output

6 Digital input SPI serial clock signal (connected to L6470 CK input)

7 Digital input

8 Digital input SPI slave select signal (connected to L6470 CS input)

9 Digital input L6470 step-clock input

10 Digital input L6470 STBY/RST input

SPI master IN slave OUT signal (connected to the L6470 SDO output through the daisy-chain termination jumper JP2)

SPI master OUT slave IN signal (connected to L6470 SDI input)

Doc ID 022606 Rev 2 3/12

Board description EVAL6470PD

Table 4. Slave SPI connector pinout (J11)