This is preliminary 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

12

EVAL6470PD

Fully integrated stepper motor driver mounting the L6470 in a highpower 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 (Rthj-a12 °C/W typical)

Suitable for use in combination with the STEVAL-PCC009V2

DescriptionThe 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 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 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 outputSPI 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 inputSPI 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)

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 pin 5 of J10)

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

7 Digital inputSPI master OUT slave IN signal (connected to L6470 SDO output)

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

EVAL6470PD Board description

Doc ID 022606 Rev 2 5/12

Figure 2. EVAL6470PD - schematic

1A 2A

SW

1B 2B

OS

CIN

OS

CO

UT

App

licat

ion

refe

renc

e

VS

GN

D

GERVDDV

SP

I_IN

SP

I_O

UT

YSUBGAL F

OP

TIO

N

YBT SKC TS

VS

GN

DG

ND

SW

MIS

OS

DI

CK

nCS

FLA

GB

US

Y

ST

CK

ST

BY

_RE

SE

T

MIS

OS

DO

CK

nCS

FLA

GB

US

Y

SD

OM

ISO

BU

SY

SD

IC

KnC

S

SW

ST

CK

AD

CIN

SD

O

FLA

GB

US

Y

FLA

GS

TB

Y_R

ES

ET

ST

CK

ST

BY

_RE

SE

T

VS

VS

EX

T_V

DD

EX

T_V

DD

EX

T_V

DD

VD

D

VR

EG

VR

EG

VD

D

VR

EG

VD

D

VD

D

VD

DV

DD

VS

VS

TP

1

1

C1510

0nF

/50V

CN

3N

.M.

12

CN

11

23

45

67

89

10

C9

100p

F/6

.3V

R4

39K

M2

1 2

C3

10nF

/50V

+C

1

100u

F/6

3VJP3

U1

L647

0

VDD24

VREG9

OS

CIN

10

OS

CO

UT

11

CP13

VBOOT14

AD

CIN

8

VSA4

VSA5

VSB15

VSB16 PGND

1

OU

T1A

2

OU

T2A

35

OU

T1B

17

OU

T2B

20

AGND12

SW

7

DGND

28

BU

SY

_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

VSB23

VSA

33

VSA34

PGND19

E_PAD

37

TP

6

1

C13

10nF

/6.3

V

TP

11

1

TP

10

1

C11

1nF

/6.3

V

R6

470

C8

220n

F/1

6V

R8

10K

C2

100n

F/5

0V

C6

100n

F/6

.3V

TP

21

CN

4 N.M

.1 2D

L1

21

TR

120

0k

13

2

C16 10

0nF

/50V

DL2

21

M3

12

R3

39K

R1

31K

6

C12

3.3n

F/6

.3V

TP

9

1

TP

31

D2

BZ

X58

5-B

3V6

+C

1A10

0uF

/63V

R5

39K

C5

47uF

/6.3

V

CN

21

23

45

67

89

10

R7

470

TP

5

1

M1

1 2

C4

100n

F/6

.3V

TP

8

1

JP2

C10

100p

F/6

.3V

D1

BA

V99

12

3

C14

100n

F/5

0V

R2

8K

2

C7

10uF

/6.3

V

JP1

AM12921v1

Board description EVAL6470PD

6/12 Doc ID 022606 Rev 2

Table 5. EVAL6470PD - bill of material

Index Quantity Reference Value Package

1 1 CN1Pol. IDC male header vertical 10 poles (black)

CON-FLAT-5X2-180M

2 1 CN2Pol. IDC male header vertical 10 poles (gray)

CON-FLAT-5X2-180M

3 2 CN3,CN4 N.M. STRIP254P-M-2

4 1 C1A 100 µF/63 V (option) CAPE-R10HXX-P5

5 1 C1 100 µF/63 V CAPES-R10HXX

6 4 C2,C14,C15,C1 100 nF/50 V CAPC-0603

7 1 C3 10 nF/50 V CAPC-0603

8 2 C4,C6 100 nF/6.3 V CAPC-0603

9 1 C5 47 µF/6.3 V CAPC-1206

10 1 C7 10 µF/6.3 V CAPC-0805

11 1 C8 220 nF/16 V CAPC-0603

12 2 C9,C10 100 pF/6.3 V CAPC-0603

13 1 C11 1 nF/6.3 V CAPC-0603

14 1 C12 3.3 nF/6.3 V CAPC-0603

15 1 C13 10 nF/6.3 V CAPC-0603

16 1 DL1 LED red LEDC-0805

17 1 DL2 LED amber LEDC-0805

18 1 D1 BAV99 SOT23

19 1 D2 BZX585-B3V6 SOD523

20 1 JP1 Jumper OPEN JP2SO

21 2 JP2,JP3 Jumper CLOSED JP2SO

22 3 M1,M2,M3 Screw connector 2 poles MORSV-508-2P

23 1 R1 31.6 kΩ RESC-0603

24 1 R2 8.2 kΩ RESC-0603

25 3 R3 R4 R5 39 kΩ RESC-0603

26 2 R6,R7 470 kΩ RESC-0603

27 1 R8 10 kΩ RESC-0603

28 9

TP1, TP2, TP3, TP5, TP6, TP8,

TP9, TP10, TP11

TPTH-RING-1MM TPTH-RING-1MM

29 1 TR1 200 kΩ TRIMM-100x50x110-64W

30 1 U1 L6470 PowerSO36

EVAL6470PD Board description

Doc ID 022606 Rev 2 7/12

Figure 3. EVAL6470PD - Layout (silk screen)

Figure 4. EVAL6470PD - Layout (top layer)

AM12922v1

AM12923v1

Board description EVAL6470PD

8/12 Doc ID 022606 Rev 2

Figure 5. EVAL6470PD - Layout (inner layer 2)

Figure 6. EVAL6470PD - Layout (inner layer 3)

AM12924v1

AM12925v1

EVAL6470PD Board description

Doc ID 022606 Rev 2 9/12

Figure 7. EVAL6470PD - Layout (bottom layer

AM12926v1

Board description EVAL6470PD

10/12 Doc ID 022606 Rev 2

1.1 Thermal data

Figure 8. Thermal impedance graph

0

2

4

6

8

10

1 10 100 1000 10000

Time (seconds)

Zth

Z

th(°

C/W

)

12

AM11337v1

EVAL6470PD Revision history

Doc ID 022606 Rev 2 11/12

2 Revision history

Table 6. Document revision history

Date Revision Changes

23-Dec-2011 1 Initial release.

31-May-2012 2

Updated: Figure 2, Figure 3, Figure 4, Figure 5, Figure 6, Figure 7.

Updated TP9 (STBY/RES) function in Table 2; Updated pin 1and pin 10 description both in Table 3 and in Table 4.Updated Table 5: EVAL6470PD - bill of material.

EVAL6470PD

12/12 Doc ID 022606 Rev 2

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