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Introduction

The 

EVALSP820-XS

 is an easy to use evaluation board for the STSPIN820, providing a compact solution to evaluate the

performance of the STSPIN820 stepper motor driver with minimal external equipment and without the need for extra
components.

The hardware is fully compatible with RepRAp Arduino Mega Poloulo Shield (RAMPS) or other similar Fused Filament
Fabrication (FFF) 3D Printing platforms, representing a very fast drop-in replacement of similar solutions. Contrary to most other
competitor solutions, the EVALSP820-XS helps customers to really exploit the benefits of working at high microstepping
resolution.

 Getting started with the EVALSP820-XS evaluation board 

 UM2434 

User manual

UM2434

 - 

Rev 1

 - 

June 2018

For further information contact your local STMicroelectronics sales office.

www.st.com

Summary of Contents for EVALSP820-XS

Page 1: ...uino Mega Poloulo Shield RAMPS or other similar Fused Filament Fabrication FFF 3D Printing platforms representing a very fast drop in replacement of similar solutions Contrary to most other competitor solutions the EVALSP820 XS helps customers to really exploit the benefits of working at high microstepping resolution Getting started with the EVALSP820 XS evaluation board UM2434 User manual UM2434 ...

Page 2: ...crostepping resolution up to 1 256th of step Overcurrent short circuit and overtemperature protections Figure 1 Board overview Table 1 Board pinout J1 Signal J2 Signal 8 Enable EN 1 Motor supply voltage VM 7 Step mode selection input M0 2 Ground 6 Step mode selection input M1 3 Phase B out 1 OUTB1 5 Step mode selection input M2 4 Phase B out 2 OUTB2 4 NC 5 Phase A out 2 OUTA2 3 Active low standby ...

Page 3: ...ends on the VDD logic supply voltage pin 6 of J2 as listed in the table below Table 2 Peak current ranges VDD Minimum Maximum 3 3 V VREF 0 V Ipeak 0 A 1 VREF 0 67 V Ipeak 4 5 A 2 5 V VREF 0 V Ipeak 0 A 1 VREF 1 V Ipeak 6 8 A 2 1 Minimum current could be present due to the PWM current control operation 2 The overcurrent protection of the STSPIN820 could limit the actual peak current 2 2 1 Modify th...

Page 4: ...FF time vs ROFF value 0 20 40 60 80 100 120 140 160 OFF time µs ROFF k AM040213 2 4 Setting the step mode The inputs M0 M1 and M2 sets the step mode of the STSPIN820 driver as listed in the table below Table 3 Step mode selection M2 M1 M0 Mode LOW LOW LOW Full step LOW LOW HIGH step LOW HIGH LOW of step LOW HIGH HIGH 1 8th of step HIGH LOW LOW 1 16 th of step HIGH LOW HIGH 1 32 nd of step HIGH HIG...

Page 5: ...A1 5 OUTB1 12 OUTB2 11 SENSEB1 14 GND 2 EPAD 25 DECAY 18 MODE2 22 VS 10 SENSEA2 6 SENSEB2 13 SNSA 4 SNSB 15 GND 3 R9 0 15R R7 10K ST2TA103 1 3 2 R8 0 15R C2 1NF R2 100K C4 4 7UF 50V R3 39K J2 1 2 3 4 5 6 7 8 R6 39K R4 18K J1 1 2 3 4 5 6 7 8 R5 10K R1 100K C3 100NF OUTB1 OUTB2 DIR M2 M1 M0 EN VMM STEP OUTA1 OUTA2 AM040394 Figure 4 Layout top AM040395 Figure 5 Layout bottom AM040396 UM2434 Schematic...

Page 6: ...4 1 C4 4 7 UF 50 V 0 15 0805 5 2 J1 J2 61300811121 WURTH ELECTRONIK 61300811121 6 2 R1 R2 100 K 1 10 W 0 05 0603 7 2 R3 R6 39 K 1 10 W 0 05 0603 8 1 R4 18 K 1 10 W 0 05 0603 9 1 R5 10 K 1 10 W 0 05 0603 10 1 R7 10 K 1 10 W 0 2 L2 75_W2 2_H0 8 BOURNS TC42X 2 103 11 2 R8 R9 0 15 R 1 2 W 0 01 1206 12 1 U1 STSPIN820 QFN24_L4_W4_P0 5 ST STSPIN820 UM2434 Schematic layout and bill of material UM2434 Rev ...

Page 7: ...Revision history Table 5 Document revision history Date Version Changes 28 Jun 2018 1 Initial release UM2434 UM2434 Rev 1 page 7 11 ...

Page 8: ...fety precautions 3 2 2 Adjusting motor peak current 3 2 2 1 Modify the peak current range 3 2 3 Setting off time duration 3 2 4 Setting the step mode 4 3 Schematic layout and bill of material 5 Revision history 7 UM2434 Contents UM2434 Rev 1 page 8 11 ...

Page 9: ...st of tables Table 1 Board pinout 2 Table 2 Peak current ranges 3 Table 3 Step mode selection 4 Table 4 Bill of material 6 Table 5 Document revision history 7 UM2434 List of tables UM2434 Rev 1 page 9 11 ...

Page 10: ...List of figures Figure 1 Board overview 2 Figure 2 OFF time vs ROFF value 4 Figure 3 Schematic 5 Figure 4 Layout top 5 Figure 5 Layout bottom 5 UM2434 List of figures UM2434 Rev 1 page 10 11 ...

Page 11: ...r the choice selection and use of ST products and ST assumes no liability for application assistance or the design of Purchasers products No license express or implied to any intellectual property right is granted by ST herein Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product ST and the ST logo are trademark...

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