For further information contact your local STMicroelectronics sales office.

September 2012 Doc ID 023548 Rev 2 1/11

11

EVAL6474PD

Stepper motor driver mounting the L6474 in a high power PowerSOpackage

Data brief

Features■ Voltage range from 8 V to 45 V

■ Phase current up to 3 Ar.m.s.

■ SPI with daisy chain feature

■ Socket for external resonator or crystal

■ FLAG LED indicator

■ Suitable for use in combination with STEVAL-PCC009V2

DescriptionThe EVAL6474PD demonstration board is a microstepping motor driver. In combination with the STEVAL-PCC009V2 communication board and easySPIN evaluation software, the board allows the user to investigate all the features of the L6474 device.

The 4-layer layout and the PowerSO™ package allow the highest thermal performance to be obtained.

The EVAL6474PD supports the daisy chain configuration making it suitable for the evaluation of the L6474 in multi-motor applications.

www.st.com

Board description EVAL6474PD

2/11 Doc ID 023548 Rev 2

1 Board description

Figure 1. Jumper and connector location

Table 1. EVAL6474PD specifications

Parameter Value

Supply voltage (VS) 8 to 45 V

Maximum output current (each phase) 3 Ar.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 0 V

High level logic input voltage VDD(1)

1. All logic inputs are 5 V tolerant.

Operating temperature -25 to +125 °C

L6474PD thermal resistance junction-to-ambient 12 °C/W typical

Phase A connector

Power supply connector(8 V - 45 V)

Master SPIconnector

SYNCoutput

FLAG LED(Red)

JP1: VDD supply frommaster SPI connector

JP2: VDD to VREG connection

OSCIN/OSCOUT connector

JP3: Daisy chain

JP5: DIR to slave board

JP6: STCK to slave board

termination

Phase B connector

Slave SPIconnector

Application referenc earea

AM14866v1

EVAL6474PD Board description

Doc ID 023548 Rev 2 3/11

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 SYNC output

TP1 (VS) Test point Motor supply voltage test point

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

TP6 (VREG) Test pointLogic supply voltage/L6474 internal regulator test point

TP4 TP5 (GND) Test point Ground test point

TP8 (STCK) Test point Step-clock input test point

TP3 (DIR) Test point BUSY/SYNC output test point

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

TP7(FLAG) Test point FLAG output test point

Table 3. Master SPI connector pinout (CN1)

Pin number

Type Description

1 Open drain output L6474 direction input

2 Open drain output L6474 FLAG output

3 Ground Ground

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

5 Digital outputSPI master IN slave OUT signal (connected to L6474 SDO output through daisy chain termination jumper JP2)

6 Digital input SPI serial clock signal (connected to L6474 CK input)

7 Digital inputSPI master OUT slave IN signal (connected to L6474 SDI input)

8 Digital input SPI slave select signal (connected to L6474 CS input)

9 Digital input L6474 step-clock input

10 Digital input L6474 standby/reset input

Board description EVAL6474PD

4/11 Doc ID 023548 Rev 2

Table 4. Slave SPI connector pinout (CN2)

Pin number

Type Description

1 Open drain output L6474 direction input

2 Open drain output L6474 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 pin 5 of J10)

6 Digital input SPI serial clock signal (connected to L6474 CK input)

7 Digital inputSPI master OUT slave IN signal (connected to L6474 SDO output)

8 Digital input SPI slave select signal (connected to L6474 CS input)

9 Digital input L6474 step-clock input

10 Digital input L6474 standby/reset input

EVAL6474PD Board description

Doc ID 023548 Rev 2 5/11

Figure 2. EVAL6474PD schematic

VD

DV

RE

G

VS

SP

I_IN

SP

I_O

UT

GN

D

App

licat

ion

refe

renc

e

FLA

G

DIR

STB

Y/R

ES

STC

K

1A 2A 1B 2B

VS

GN

D

SY

NC

OP

TIO

N

GN

D

ST

CK

DIR

nCS

CK

SD

IS

DO

AD

CIN

DIR

FLA

G

CK

nCS

ST

BY

_RE

SE

TS

TC

K

MIS

OS

DI

ST

BY

_RE

SE

T

SD

OM

ISO

CK

FLA

G

ST

BY

_RE

SE

TnC

SS

DO

MIS

O

ST

CK

DIR

FLA

G

VS

VR

EG

VD

D

VR

EG

VD

D

VD

D

VR

EG

EX

T_V

DD

VS

EX

T_V

DD

VR

EG

VD

DE

XT

_VD

D

VD

D

VD

D

VS

TP

3

1

M1

1 2

+C

110

0uF

/63V

JP3

12

C7

10uF

/6.3

V

JP5

12

CN

21

23

45

67

89

10

TP

1

1

CN

4

N.M

.1

M2

1 2

R5

39k

C3

10nF

/50V

C6

100n

F/5

0V

TP

4

1

C5

47uF

/6.3

V

C11

1nF

/6.3

V

C8

220n

F/1

6V

M3

12

CN

3N

.M.

12

C12

3.3n

F/6

.3V

TP

5

1

C15

100n

F/5

0V

DL1

RE

D

21

JP4

12

TP

8

1

R1

39k

C13

100n

F/5

0V

TP

2

1

TP

7

1

C14

100n

F/5

0V

R4

39k

TP

6

1

TP

9

1

JP1

12

+C

1A10

0uF

/63V

R2

470

D1

BA

V99

12

3

C10

1nF

/6.3

V

C2

100n

F/5

0V

R3

39k

U1

L6

47

4P

D

VDD24

VREG9

OS

CIN

10

OS

CO

UT

11

CP13

VBOOT14

AD

CIN

8

VSA

4

VSA

5

VSB

15

VSB

16PGND

1

OU

T1A

2

OU

T2A

35

OU

T1B

17

OU

T2B

20

AGND12

DIR

7

DGND28

SY

NC

29F

LAG

31

SD

O25

SD

I27

CK

26C

S30

ST

BY

_RE

S6

ST

CK

32

OU

T1A

3

OU

T1B

18

OU

T2B

21

OU

T2A

36

VSB22

VSB

23

VSA33VSA

34

PGND 19

E_PADEP

C4

100n

F/5

0V

JP2

12

TR

150

k

1 3

2

C9

1nF

/6.3

V

CN

11

23

45

67

89

10

AM14867v1

Board description EVAL6474PD

6/11 Doc ID 023548 Rev 2

Table 5. Bill of material

Index Quantity Reference Value Package

1 1 C1 220 nF/16 V CAPC-0603

2 1 C2 47 µF/6.3 V CAPC-3216

3 1 C3 100 nF/6.3 V CAPC-0603

4 1 C4 10 µF/4 V CAPC-3216

5 1 C5 100 nF/4 V CAPC-0603

6 4 C6, C7, C8, C10 100 nF/50 V CAPC-0603

7 1 CN1

10-pole Polarized IDC

Male header 2.54 mmvertical black

CON-FLAT-5X2-180M

8 1 CN210-pole Polarized IDCMale header 2.54 mm

vertical grayCON-FLAT-5X2-180M

9 1 CN3 N.M STRIP254P-M-2

10 1 CN4 N.M TPTH-RING-1MM

11 1 C1A 100 uF/63 V CAPE-R10HXX-P5

12 1 C1 100 uF/63 V CAPES-R10HXX

13 6C2,C4,C6,C13,C14

,C15100 nF/50 V CAPC-0603

14 1 C3 10 nF/50 V CAPC-0603

15 1 C5 47 uF/6.3 V CAPC-1206

16 1 C7 10 uF/6.3 V CAPC-0805

17 1 C8 220 nF/16 V CAPC-0603

18 3 C9, C10, C11 1 nF/6.3 V CAPC-0603

19 1 C12 3.3 nF/6.3 V CAPC-0603

20 1 DL1 LED red LEDC-0805

21 1 D1 BAV99 SOT-23

22 1 JP1 Jumper open JP2SO

23 4 JP2, JP3, JP4, JP5 Jumper closed JP2SO

24 3 M1, M2, M3 Screw connector 2 poles MORSV-508-2P

EVAL6474PD Board description

Doc ID 023548 Rev 2 7/11

Figure 3. EVAL6474PD - silkscreen

Figure 4. EVAL6474PD - layout (top layer)

AM14868v1

AM14869v1

Board description EVAL6474PD

8/11 Doc ID 023548 Rev 2

Figure 5. EVAL6474PD - layout (inner layer2)

Figure 6. EVAL6474PD - layout (inner layer3)

AM14870v1

AM14871v1

EVAL6474PD Board description

Doc ID 023548 Rev 2 9/11

1.1 Thermal data

Figure 7. EVAL6474PD - layout (bottom layer3)

AM14872v1

Figure 8. Thermal impedance graph

101 100 1000

Zth

time (seconds)

25

20

15

10

5

Zth

0

(°C/W)

AM14873v1

Revision history EVAL6474PD

10/11 Doc ID 023548 Rev 2

2 Revision history

Table 6. Document revision history

Date Revision Changes

07-Aug-2012 1 Initial release.

07-Sep-2012 2 In cover page, dSPIN has been changed into easySPIN.

EVAL6474PD

Doc ID 023548 Rev 2 11/11

Please Read Carefully:

Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve theright to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at anytime, without notice.

All ST products are sold pursuant to ST’s terms and conditions of sale.

Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes noliability whatsoever relating to the choice, selection or use of the ST products and services described herein.

No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of thisdocument refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party productsor services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of suchthird party products or services or any intellectual property contained therein.

UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIEDWARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIEDWARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWSOF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.

UNLESS EXPRESSLY APPROVED IN WRITING BY TWO AUTHORIZED ST REPRESENTATIVES, ST PRODUCTS ARE NOTRECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAININGAPPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY,DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVEGRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER’S OWN RISK.

Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately voidany warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, anyliability of ST.

ST and the ST logo are trademarks or registered trademarks of ST in various countries.

Information in this document supersedes and replaces all information previously supplied.

The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.

© 2012 STMicroelectronics - All rights reserved

STMicroelectronics group of companies

Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America

www.st.com