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
12
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)
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 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 OUT slave IN signal (connected to L6470 SDO
output)
4/12 Doc ID 022606 Rev 2
EVAL6470PD Board description
Figure 2. EVAL6470PD - schematic
VREG
1B
2B
M3
1
2
JP2
1A
2A
SDOMISO
M2
2
1
VDD
JP1
EXT_VDD
FLAGBUSY
CN2
1 2
FLAGBUSY
CN1
1 2
TP1
1
VS
VS
M1
EXT_VDD
CK
nCS
6
345
7 8
MISO
SDO
EXT_VDD
CK
nCS
6
3 4
7 8
5
MISO
SDI
1
2
VS
GND
JP3
9 10
STCK STBY_RESET
TP9
YB
T
1
S
SPI_IN SPI_OUT
9 10
K
C
TS
1
STCK STBY_RESET
TP8
VREG
1
GERVDDV
TP3
VDD
1
TP2
C8
220nF/16V
OPTION
C7
10uF/6.3V
100uF/63V
C1
+
C6
VS
100nF/6.3V
47uF/6.3V
C5
C4
100nF/6.3V
12
D1
C1A
+
VS
100nF/50V
100nF/50V
10nF/50V
C3
3
BAV99
VREG
VDD
CN3
N.M.
100uF/63V
C16
C15
C14
C2
23
22
16
15
13
14
24
34
33
4
5
9
VSB
VSB
VSB
VSB
VSA
VSA
VSA
VSA
CP
VBOOT
VREG
VDD
U1
2
1
100nF/50V
100nF/50V
OSCINOSCOUT
VDD
2
3
OUT1A
OUT2A35OUT1B
OUT1A
OSCIN10OSCOUT
11
R5
R4
R3
36
OUT2A
39K
39K
39K
ADCIN
7
8
ADCIN
SW
L6470
SW
TP6
1
TP5
1
GND GND
18
20
17
21
OUT1B
OUT2B
OUT2B
PGND
PGND
19
AGND
1
12
DGND
28
E_PAD
37
BUSY_SYNC29FLAG
STBY_RES
STCK
6
32
31
SDI27CK
SDO
CS
25
30
26
SDI
CK
SDO
nCS
C12
3.3nF/6.3V
D2
1nF/6.3V
C11
BZX585-B3V6
C10
100pF/6.3V
C9
100pF/6.3V
TP11
TP10
SW
C13
10nF/6.3V
R8
10K
1
2
N.M.
CN4
SW
BUSY
YSUBGA
1
1
DL2
2
R7
470
FLAG
L
1
F
1
Application reference
DL1
2
200k
31K6
TR1
R2
8K2
13
2
R1
VS
STCK
BUSY
FLAG
STBY_RESET
VDD VDD
470
R6
AM12921v1
Doc ID 022606 Rev 2 5/12
Board description EVAL6470PD
Table 5. EVAL6470PD - bill of material
Index Quantity Reference Value Package
1 1 CN1
2 1 CN2
Pol. IDC male header vertical
10 poles (black)
Pol. IDC male header vertical
10 poles (gray)
CON-FLAT-5X2-180M
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
TP1, TP2, TP3,
28 9
TP5, TP6, TP8,
TP9, TP10,
TPTH-RING-1MM TPTH-RING-1MM
TP11
29 1 TR1 200 kΩ TRIMM-100x50x110-64W
30 1 U1 L6470 PowerSO36
6/12 Doc ID 022606 Rev 2
EVAL6470PD Board description
Figure 3. EVAL6470PD - Layout (silk screen)
AM12922v1
Figure 4. EVAL6470PD - Layout (top layer)
AM12923v1
Doc ID 022606 Rev 2 7/12
Board description EVAL6470PD
Figure 5. EVAL6470PD - Layout (inner layer 2)
AM12924v1
Figure 6. EVAL6470PD - Layout (inner layer 3)
AM12925v1
8/12 Doc ID 022606 Rev 2
EVAL6470PD Board description
Figure 7. EVAL6470PD - Layout (bottom layer
AM12926v1
Doc ID 022606 Rev 2 9/12
Board description EVAL6470PD
1.1 Thermal data
Figure 8. Thermal impedance graph
Zth
12
10
8
6
Zth
(°C/W)
4
2
0
1
10
100
Time (seconds)
1000
10000
AM11337v1
10/12 Doc ID 022606 Rev 2
EVAL6470PD Revision history
2 Revision history
Table 6. Document revision history
Date Revision Changes
23-Dec-2011 1 Initial release.
Updated: Figure 2, Figure 3, Figure 4, Figure 5, Figure 6, Figure 7.
31-May-2012 2
Updated TP9 (STBY/RES) function in Ta bl e 2 ;
Updated pin 1and pin 10 description both in Ta bl e 3 and in Ta bl e 4 .
Updated Table 5: EVAL6470PD - bill of material.
Doc ID 022606 Rev 2 11/12
EVAL6470PD
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12/12 Doc ID 022606 Rev 2
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