Texas Instruments DRV8818EVM Manuale utente

User's Guide

SLVU681–February 2012

DRV8818EVM Evaluation Module

This document serves as a supplement to the DRV8818 data sheet. It details the hardware

implementation of the DRV8818EVM evaluation module (EVM).

Contents

1 Block Diagram ............................................................................................................... 2

1.1 Introduction ......................................................................................................... 2

1.2 Power Connectors ................................................................................................. 2

1.3 Test Stakes ......................................................................................................... 2

1.4 Jumpers ............................................................................................................. 3

1.5 Motor Outputs ...................................................................................................... 3

2 Installing Drivers And Software ........................................................................................... 3

2.1 Installing FTDI USB Driver ........................................................................................ 3

2.2 Installing DRV8818EVM Windows Application Software ..................................................... 3

2.3 Running Windows Application Software ........................................................................ 3

3 Windows Application ........................................................................................................ 4

3.1 Connecting the EVM ............................................................................................... 4

3.2 Initial Configuration ................................................................................................ 4

3.3 Operating the GUI ................................................................................................. 5

4 Schematic and Bill of Materials ........................................................................................... 9

4.1 Schematics .......................................................................................................... 9

4.2 Bill of Materials .................................................................................................... 11

List of Figures

1 Schematic 1 of 2 ............................................................................................................ 9

2 Schematic 2 of 2........................................................................................................... 10

Windows is a trademark of Microsoft Corporation.

SLVU681–February 2012 DRV8818EVM Evaluation Module

VM Power

Test Stakes

DRV8818

Motor Outputs

MSP430F1612USB

Block Diagram

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1 Block Diagram

1.1 Introduction

The DRV8818EVM is a complete solution for evaluating the DRV8818 micro-stepping, bipolar stepper

driver. It includes a USB link to provide easy control from a personal computer (PC), a MSP430

microcontroller that interprets serial commands from the PC and generates control signals to the driver

device, and the DRV8818 device with access to all signals for a complete evaluation.

1.2 Power Connectors

The DRV8818EVM uses a combination of terminal blocks and test clips for the application and monitoring

of power. The only power rail that the user must supply is VM for the device’s power stage. VDD for logic

levels is internally generated from the USB connection.

Users must apply VM (8 V to 35 V) according to data sheet recommended parameters.

1.3 Test Stakes

Every pin on the device has been brought out to a test stake. A label on the silkscreen identifies each

signal.

2DRV8818EVM Evaluation Module SLVU681–February 2012

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POT

INT

(a) (b)

POT

INT

POT

INT

(a) (b)

POT

INT

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Installing Drivers And Software

1.4 Jumpers

Two styles of jumpers are on the DRV8818EVM: two-pin jumpers and three-pin jumpers.

Users can configure three-pin jumpers independently from other two- or three-pin jumpers. However, two-

pin jumpers must all be closed or left open.

1.4.1 VREF SELECT, JP1

To configure the VREF SELECT jumper: (a) Select an analog voltage derived from VDD through a voltage

divider implemented as a potentiometer R4. (b) Select an analog voltage derived from the MSP430’s

digital-to-analog converter (DAC) channel 0 (DAC0). Set as the following inset shows in (b) if you want to

use the GUI to control the VREF voltage.

1.4.2 DECAY SELECT, JP6

To configure the DECAY SELECT jumper: (a) Select an analog voltage derived from VDD through a

voltage divider implemented as a potentiometer R6. (b) Select an analog voltage derived from the

MSP430’s DAC channel 1 (DAC1). Set as the following inset shows in (b) if you want to use the GUI to

control the DECAY modes.

1.5 Motor Outputs

Users can connect the bipolar stepper motor into the DRV8818EVM in three ways: four-pin header (J2),

four-position terminal block (J3), or test clips. Each connection style offers identical connectivity to the

device’s output terminals. The recommended way, however, is to use the header or terminal block

because the test stakes traces are of low-current handling capability.

2 Installing Drivers And Software

2.1 Installing FTDI USB Driver

Download the DRV8818EVM Software and Development package from the TI Web site in the

DRV8818EVM Evaluation Module product folder. Find and unzip Step 1 - INSTALL_USB_Driver into a

separate folder. See instructions on how to install the FTDI USB driver on a Windows™-based computer

in the FTDI_Drivers_Install_Readme.pdf file.

2.2 Installing DRV8818EVM Windows Application Software

The available download also includes a file named DRV8818EVM_Windows7_Application.zip. Copy the

contents of this folder to any desired folder on the computer. This causes the Settings.ini file to be written

to the desired folder on software exit. This action cannot occur if the application is run within the zip file.

Make sure to first unzip all the contents of the zip file into a folder on your computer.

2.3 Running Windows Application Software

To run the application, double-click the DRV8818EVM.exe application icon found on the same folder into

which the application was extracted. It is also available in the START menu under Texas Instruments Inc.

SLVU681–February 2012 DRV8818EVM Evaluation Module

Windows Application

www.ti.com

3 Windows Application

The DRV8818 Windows application is the software counterpart for the DRV8818EVM. This application is

in charge of connecting to the MSP430 microcontroller by an USB connection, which in turn selects the

proper logic state for the DRV8818 control signals.

The design of the graphical user interface (GUI) allows for all of the DRV8818 device’s functionality to be

tested without having to intervene with the hardware, except for the proper configuration of jumpers, when

necessary.

The following illustration shows the DRV8818EVM.exe main screen. It contains menu items to configure

and enable and disable the serial port, frames with GPIO control for the DRV8818 Control Signals,

Stepper Motor control for start and stop and speed, and current and decay control through the MSP430

DACs.

3.1 Connecting the EVM

The GUI auto-detects the port to which the USB has connected on connection of the USB cable between

the EVM and an available port on your PC. This is displayed in the window. Click the Connect button. If

this does not work, possible sources of error are as follows:

• FTDI drivers were not installed properly and the FTDI-USB chip is not recognized. Check for

connection in Control Panel→System→Hardware→Device Manager→Ports for a valid connection.

• Close the GUI, and reopen it to properly identify the open port.

3.2 Initial Configuration

First, go into the File menu. Select File→Configure Parameters, and the following box displays:

4DRV8818EVM Evaluation Module SLVU681–February 2012

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Windows Application

Rsense shows the default of 100. If any modifications are made to the EVM, be sure to change these

fields so that current is properly regulated.

3.3 Operating the GUI

SLVU681–February 2012 DRV8818EVM Evaluation Module

Windows Application

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3.3.1 Pin Information Control

Control pins appear in RED or GREEN. Click on these pins to change the state of the pin; this shows the

current state. Using the following key, you can see that a RED color indicates that the pin is a logic low,

and a GREEN color indicates it is logic high.

3.3.2 Basic Configuration and Control Buttons

Whereas clicking the individual pins changes the state of the pins, you can also use the control boxes at

the bottom to change the state of the pins.

For example, click on the Full Step radio button in the bottom right corner of the highlighted box. What

happens to the picture on the top?

6DRV8818EVM Evaluation Module SLVU681–February 2012

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Windows Application

3.3.3 Current Control and Decay Modes

This set of boxes controls the reference current and the current decay modes once this current threshold

is reached.

•Decay Control: The slider allows you to control the voltage on the DECAY pin. This controls which

mode the device is in when the current is decreasing through the load on the falling edge of the

sinusoidal current. In FULL Step mode, this control does not apply. The table shows the modes as it

corresponds to the voltage applied on the DECAY pin. For example, a voltage less than 0.7 V fixes the

device in a Fast decay mode. A voltage greater than 2 V puts the device in a Slow decay more. A

voltage between 0.7 V and 2 V selects a mixed decay with a ratio of fast decay followed by slow decay

depending on the voltage set between 0.7 V and 2 V. This is easier to see on an oscilloscope capture.

•Current Control: This slider sets the voltage on VREF. The current displays on the screen based on

the following calculation:

Iref = Vref / 8 × Rsense

SLVU681–February 2012 DRV8818EVM Evaluation Module

Windows Application

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3.3.4 Motion Control

Constant Speed Mode:

•Starting Speed (PPS): The following discussion defines pulses-per-second or PPS. A pulse is a single

step in the logic table. This is not necessarily a mechanical step. If you change micro-stepping modes,

you must double this for the same speed (in 1/2 step), x4 for 1/4 step, and so on.

•Desired Speed (PPS): This is the final speed that the motor ramps to and holds, otherwise known as

the target speed.

•Acceleration Rate (PPSPS): This is how fast the device ramps from the starting speed to the desired

speed. This is also the deceleration rate once you pause stepping.

•Start Steps Button: Press this button to spin. Press it again to stop, or pause, spinning.

•Update Speed Button: While spinning, you can change the Desired Speed field and nothing will

happen until you click Update Speed.

Indexing Mode:

•# of Steps: In Full Step mode, this is the number of mechanical steps you want to take. For example,

if the motor on your bench has 200 steps in a revolution and you want to move one revolution, you

choose 200 steps. If you are in 1/2 step mode, you need to double this to 400 for a full revolution.

•Steps To Stop: When the number of steps taken achieves this point, the motor starts to decelerate at

the rate given in the Acceleration Rate field.

•Stopping Speed: After the steps in the Steps To Stop field is reached and the motor begins to

decelerate, the motor rotates at this speed (once it is reached) until the value in the # of Steps is

reached.

•Move Steps Button: Click this to begin indexing. Once indexing is complete, you can click it again to

repeat the cycle.

8DRV8818EVM Evaluation Module SLVU681–February 2012

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GND

RESETn

TEP

AOUT2

ENABLEn

SLEEPn

HOME

DIR

AOUT1

.22uF

GND

BOUT2B OUT1

SM0

SM1

0.1

GND

0.1uF

C10

0.1uF

.22uF

0.1uF

100uF

0.1uF

ISENA

REF

ECAY

GND

JP1

VREF_SELECT

GVREF

REF

000

C11

47K

GND

1000pf

C13

47K

GND

RCA

TP9

BOUT1

ISENB

TP10

USM1

TP11

USM0

TP12

ISENB

TP13

SRn

TP14

RESET

TP1

BOUT2

TP16

STEP

TP17

VCP

TP18

CP2

TP19

CP1

TP20

AOUT2

TP21

ENABLEn

TP22

SLEEPn

TP23

GND

TP1

ISENA

TP2

HOME

TP3

DIR

TP4

AOUT1

TP5

TP6

RCA

TP7

VREF

TP8

RCB

HOME

DIR

AOU T1

BOUT1

USM0

USM1

RCA

RCB

VREF

ISENA

ISENB

RESETn

SRn

STEP

AOU T2

ENABLEn

SLEEPn

BOUT2

VCP

CP1

CP2

CP1

CP2

DECAY

GND

TP24

TP25

VDD

ISENA

HOME

DIR

AOUT1

DECAY

RCA

GND

VREF

RCB

VCC

BOUT1

USM1

USM0

ISENB

14VMB 1

SRn 1

RESETn 1

BOUT2 1

STEP 19

VGD 2

GND 2

VCP 2

CP1 2

CP2 2

AOUT2 2

ENABLEn 2

SLEEPn 2

VMA 2

U1 DRV8818

000

C12

D2MBRS360

D6MBRS360

D3MBRS360

D7MBRS360

D4MBRS360

D8MBRS360

D5MBRS360

BRS360

JP2 JP3 JP4 JP5

AOUT1 AOUT2 BOUT1

BOUT2

VM VM VM VM

DRV8818

.1uF

TP27

GND

TP28

GND

TP26

GND

TP29

GND

AOUT1

AOUT2

OUT1B

BOUT2

2.2K

GND

V3P3

TP30

VGD

JP6

DECAY_SELECT

GDECAY

ECAY RV8818EVM

DRV8818EVM

Input VoltageVCC: 5V

Input VoltageVDD: 3.3V to 5V

Input VoltageVM: 8V to 32V

SRn

RESETn

USM0

USM1

DIR

HOME

SLEEPn

ENABLEn

STEP

AOUT1

AOUT2

OUT1B

BOUT2

DCAY

This section can be populated

for asynchronous recirculation

modes of operation.

www.ti.com

Schematic and Bill of Materials

4 Schematic and Bill of Materials

4.1 Schematics

Figure 1. Schematic 1 of 2

SLVU681–February 2012 DRV8818EVM Evaluation Module

TXD

DTR

RTS

VCCIO

RXD

GND

DSR

DCD

CTS

CBUS4

CBUS2

CBUS3

4USBDP 15

USBDM 1

3V3O 17

GND 18

RST 19

VCC 20

GND 21

CBUS1 22

CBUS0 23

NC 24

AGND 25

TEST 26

OSCI 27

OSCO 28

FTD232R

0.1uF

C19

GND

V3p3

VCC 1

DM 2

DP 3

GND 4

SHLD

USBB Conn

5VCC

10mHL

5VCC

0.1uF

C14

GND

USBDM

USBDP

TX OSCO

OSCI

CBUS0

CBUS1

BUS2

BUS3

ESET

DSR

DCD

BUS4

USB5V

GND

196K

110K

330

GND GND

10uF

C22

GND

0.1uf C23

5VCC V3P3

GND

EN*

IN OUT

OUT

S77701

D11

P6.3/A3

P6.5/A5

VREF+

VeREF+

P1.1/TA0

P1.4/SMCLK

P1.7/TA2

P2.2/CAOUT/TA0

P2.5/ROSC

P3.0/STE0

P3.3/UCLK0/SCL

P3.7/URXD1 35

P4.1/TB1 37

P4.4/TB4 40

P5.1/SIMO1 45

P5.4/MCLK 48

P5.7/TBOUTH/VSOUT 51

TDO/TDI 54

TCK 57

P6.2/A2 61

AVCC 64

P6.4/A4

P6.6/A6/DAC0

XOUT

P1.0/TACLK

P1.3/TA2

P1.6/TA1

P2.1/TAINCLK

P2.4/CA1/TA2

P2.7/TA0

P3.2/SOMI0

P3.5/URXD0 33

P4.0/TB0 36

P4.3/TB3 39

P4.7/TBCLK 43

P5.3/UCLK1 47

P5.6/ACLK 50

XT2IN 53

TMS 56

RST/NMI 58

P6.1/A1 60

DVSS 63

P5.0/STE1 44

DVCC

P6.7/A7/DAC1/SVSIN

XIN

VREF-/VeREF-

P1.2/TA1

P1.5/TA0

P2.0/ACLK

P2.3/CA0/TA1

P2.6/ADC12CLK/DMA E0

P3.1/SIMO0/SDA

P3.4/UTXD0

P3.6/UTXD1 34

P4.2/TB2 38

P4.5/TB5 41

P5.2/SOMI1 46

P5.5/SMCLK 49

XT2OUT 52

TDI/TCLK 55

P6.0/A0 59

AVSS 62

P4.6/TB6 42

MSP430F2917

GND

10uF

C16

10uF

C18

0.1uF

C17

33pF

C20

33pF

C21

910

11 12

13 14

JTAG

GND

JMP1

PWRSelect

4.7K R8

0.1uF

C15

GND

1-2JTG_PWR

2-3TRG_PWR

8MHZ

V3p3

330

D10

GND

P6M5

SW-PB

GND

RST

SLEEPn

ENABLEn

HOME

DIR

STEP

RST

P6M5

USM1

USM0

RESETn

SRn

GVREF

GDECAY

DRV8818EVM

Input VoltageVCC: 5V

Input VoltageVDD: 3.3V to 5V

Input VoltageVM: 8V to 32V

R101

R102

R103

R104

R105

R106

R107

R108

R109

JP7

MCU PWR

V3p3

USBDP

USBDM

Schematic and Bill of Materials

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Figure 2. Schematic 2 of 2

10 DRV8818EVM Evaluation Module SLVU681–February 2012

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