ST EVALSP820-XS Bedienungsanleitung

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

1Board overview

The main characteristics of the board are:

• Supply voltage from 7 V to 45 V

• Output current up to 1.5 A rms for each motor phase

• Peak current regulation through trimmer

• Form factor and connectivity compatible with RAMPS (RepRap Arduino Mega Pololu Shield) or similar

boards

• Based on STSPIN820 driver featuring:

–Stepper motor driving with a microstepping 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 (nSTBY) 6 Phase A out 1 (OUTA1)

2 Step-clock input (STEP) 7 Logic supply voltage (VDD)

1 Direction input (DIR) 8 Ground

UM2434

Board overview

UM2434 - Rev 1 page 2/11

2Quick start

2.1 Safety precautions

Note: Warning! Some of the components mounted on the board could reach hazardous temperatures during

operation.

While using the board, please adhere to the following precautions

• Do not touch the components

• Do not cover the board

• Do not put the board in contact with flammable materials of with materials releasing smoke when heated

After operation, allow the board to cool down before touching it.

2.2 Adjusting motor peak current

The R7 trimmer adjusts the reference voltage of the STSPIN820 PWM current controller setting the peak current

input to the motor phases.

The R7 trimmer controls the current level. Rotating clockwise increases and rotating counter clockwise decrease

the current level.

The range depends 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 the peak current range

The trimmer can be adjusted by modifying some board components.

In particular the components contributing to the definition of the peak current are:

• Both the sensing resistors

• Pull-up resistor (R6)

• Sensing resistor (R8 and R9)

The detailed formula is the following:

Changing the sensing resistors requires particular attention:

• Bust the sensing resistors must have the same value

•Power dissipation on the resistors is equal to Ipeak2 × Rsense. The power rating must be selected accordingly.

UM2434

Quick start

UM2434 - Rev 1 page 3/11

2.3 Setting off time duration

The R5 resistor sets the off time duration for the PWM current control circuitry as indicated in the figure below.

Low resistance value imposes a short off time reducing the current ripple into the motor phases.

The default value is 10 kΩ, corresponding to about 14 µs.

Figure 2. OFF time vs ROFF value

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 ½ step

LOW HIGH LOW ¼ 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 HIGH 0 1/128 th of step

HIGH HIGH HIGH 1/256 th of step

UM2434

Setting off time duration

UM2434 - Rev 1 page 4/11

3Schematic, layout and bill of material

Figure 3. Schematic

VDD

VMOT

GND

Connected on

RAMP 1.4

VCC

10NF

1NF

STSPIN820

STBY/RESET

EN/FAULT

DIR

STCK

MODE3

MODE1

REF

TOFF

OUTA1 7

OUTA2 8

SENSEA1 5

OUTB1 12

OUTB2 11

SENSEB1 14

GND

EPAD

DECAY

MODE2

SENSEA2 6

SENSEB2 13

SNSA 4

SNSB 15

GND

0.15R

10K

ST2TA103

1 3

0.15R

1NF

100K

4.7UF

50V

R3 39K

39K

18K

10K

100K

100NF

OUTB1

OUTB2

DIR

VMM

STEP

OUTA1

OUTA2

AM040394

Figure 4. Layout top

AM040395

Figure 5. Layout bottom

AM040396

UM2434

Schematic, layout and bill of material

UM2434 - Rev 1 page 5/11

Table 4. Bill of material

Item Qty. Ref. Part/ value Voltage/ watt/

ampere

Tolerance Package Manufacturer Orderable part

number

1 1 C1 10 NF 50 V 0.15 0603

2 2 C2, C5 1 NF 50 V 0.15 0603

3 1 C3 100 NF 100 V 0.15 0603

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 1 page 6/11

Revision history

Table 5. Document revision history

Date Version Changes

28-Jun-2018 1 Initial release.

UM2434

UM2434 - Rev 1 page 7/11

Contents

1 Board overview ...................................................................2

2Quick start ........................................................................3

2.1 Safety 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

3Schematic, layout and bill of material ..............................................5

Revision history ........................................................................7

UM2434

Contents

UM2434 - Rev 1 page 8/11

List 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

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

Inhaltsverzeichnis

Andere ST Hauptplatine Handbücher

ST PTB801DC Bedienungsanleitung

ST STEVAL-IHM020V1 Bedienungsanleitung

ST STM3210B-EVAL Bedienungsanleitung

ST STM8L1526-EVAL Bedienungsanleitung

ST STM3210C-EVAL Bedienungsanleitung

ST STEVAL-IDB007V1 Bedienungsanleitung

ST UM1935 Bedienungsanleitung

ST UM1748 Bedienungsanleitung

ST STM32L152RCT6 Discovery kit Bedienungsanleitung

ST STLink Bedienungsanleitung

ST ST9 Series Bedienungsanleitung

ST STM3221G-EVAL Bedienungsanleitung

ST X-NUCLEO-CCA02M1 Bedienungsanleitung

ST STEVAL-PTOOL2V1 Bedienungsanleitung

ST SPC58NG-DISP Bedienungsanleitung

ST PractiSPIN UM0696 Bedienungsanleitung

ST STM32303C-EVAL Bedienungsanleitung

ST STM3241G-EVAL Bedienungsanleitung

ST STM3240G-EVAL Bedienungsanleitung

ST L5965 Bedienungsanleitung

ST SPC58XXADPT292S Bedienungsanleitung

ST STEVAL-WESU1 Bedienungsanleitung

ST SGS-Thomson ST624x-KIT Series Bedienungsanleitung

ST STM3210B-EVAL Bedienungsanleitung

Beliebte Hauptplatine Handbücher anderer Marken

DFI

DFI SD170 Bedienungsanleitung

ASROCK

ASROCK ROMED8-2T Bedienungsanleitung

Asus

Asus P2L97A Bedienungsanleitung

Winmate

Winmate IC70 Bedienungsanleitung

Asus

Asus MES-B Bedienungsanleitung

Grantech

Grantech SYS8F377VGGA-3OMN Bedienungsanleitung

Telit Wireless Solutions

Telit Wireless Solutions SL869-3DR Bedienungsanleitung

Texas Instruments

Texas Instruments ADS8372EVM Bedienungsanleitung

Commell

Commell MS-C73 Bedienungsanleitung

Gigabyte

Gigabyte GA-9IVDT Bedienungsanleitung

IBT Technologies

IBT Technologies MB860 Bedienungsanleitung

Nvidia

Nvidia TEGRA DG-04927-001_V01 Bedienungsanleitung

Intel

Intel D33217CK Bedienungsanleitung

Asus

Asus F1A55-M LX PLUS R2.0 Bedienungsanleitung

EPC

EPC EPC9147C Bedienungsanleitung

Asus

Asus EX-B760M-V5 D4 Bedienungsanleitung

EPOX

EPOX MU-8KHA0010 Bedienungsanleitung

Ski-Doo

Ski-Doo Bombardier MPEM 219 700 090 Bedienungsanleitung