ST EVAL6470PD User Manual

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.

May 2012 Doc ID 022606 Rev 2 1/12

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

thj-a

12 °C/W

typical)

■ Suitable for use in combination with the

STEVAL-PCC009V2

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 multi-

motor applications.

AM11329v1

www.st.com

Board description EVAL6470PD

2/12 Doc ID 022606 Rev 2

1 Board description

Figure 1. Jumper and connector location

Table 1. EVAL6470PD specifications

Parameter Value

Supply voltage (VS) 8 to 45 V

Maximum output current (each phase) 3 A

r.m.s.

Logic supply voltage (VREG)

Externally supplied: 3.3 V internally

supplied: 3 V typical

Logic interface voltage (VDD)

Externally supplied: 3.3 V or 5 V

internally supplied: VREG

Low level logic input voltage 0V

High level logic input voltage VDD

(1)

1. All logic inputs are 5 V tolerant.

Operating temperature -25 to +125 °C

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

AM11330v1

EVAL6470PD Board description

Doc ID 022606 Rev 2 3/12

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

SPI master IN slave OUT signal (connected to the L6470 SDO

output through the daisy-chain termination jumper JP2)

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

7 Digital input

SPI master OUT slave IN signal (connected to L6470 SDI

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

Board description EVAL6470PD

4/12 Doc ID 022606 Rev 2

Table 4. Slave SPI connector pinout (J11)