Texas Instruments BOOSTXL-ULN2003 User Manual

BOOSTXL-ULN2003 Dual Stepper Motor Driver BoosterPack Hardware

User's Guide

Literature Number: SLCU002

September 2016

Contents

1 Introduction......................................................................................................................... 5

1.1 BOOSTXL-ULN2003 Dual Stepper Motor Driver BoosterPack Overview ........................................ 5

2 Hardware Description ........................................................................................................... 6

2.1 Top and Bottom View.................................................................................................... 6

2.2 Board Overview .......................................................................................................... 6

2.3 Block Diagram ............................................................................................................ 7

2.4 Connector, Switch, and LED Descriptions............................................................................ 8

2.5 Powering the BOOSTXL-ULN2003................................................................................... 11

2.6 Other Hardware Highlights ............................................................................................ 13

3 Interfacing With External Hardware ...................................................................................... 15

3.1 Connecting to a LaunchPad........................................................................................... 15

3.2 Connecting a Motor or Other Peripherals ........................................................................... 15

3.3 Connecting to Other Development Boards.......................................................................... 16

4 Functional Modes............................................................................................................... 17

4.1 Modes of Operation Overview ........................................................................................ 17

4.2 3-pin Serial Mode....................................................................................................... 18

4.3 8-pin Parallel Mode..................................................................................................... 19

5 Additional Information ........................................................................................................ 20

5.1 Design Files ............................................................................................................. 20

5.2 Software.................................................................................................................. 20

5.3 Hardware Change Log................................................................................................. 20

5.4 Schematic................................................................................................................ 21

2

Table of Contents

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1 BOOSTXL-ULN2003 Connected to MSP-EXP430F5529LP........................................................... 5

2 Top View of BOOSTXL-ULN2003 ......................................................................................... 6

3 Bottom View of BOOSTXL-ULN2003 ..................................................................................... 6

4 BOOSTXL-ULN2003 Top Side Overview................................................................................. 6

5 BOOSTXL-ULN2003 Block Diagram...................................................................................... 7

6 BOOSTXL-ULN2003 2x20 Header Description.......................................................................... 8

7 Board Image of Switches ................................................................................................... 9

8 Schematic View of Switches ............................................................................................... 9

9 Board Image of LEDs...................................................................................................... 10

10 Schematic View of LEDs.................................................................................................. 10

11 External Supply Connected to Motor Supply Pins..................................................................... 11

12 On-Board Power OR-ing .................................................................................................. 11

13 USB Powering a Single Motor (See NOTE) ............................................................................ 12

14 BoosterPack With ULN2003A ............................................................................................ 13

15 BoosterPack With ULN2803A ............................................................................................ 13

16 Board Image of LED Section ............................................................................................. 14

17 LED Section With R5 Depopulated ...................................................................................... 14

18 Board Image of COM Diode Section .................................................................................... 14

19 COM Diode Section With R14 Depopulated............................................................................ 14

20 BoosterPack Connected to MSP430F5529 LaunchPad .............................................................. 15

21 BoosterPack With Two Stepper Motors ................................................................................. 15

22 BoosterPack with Motor and Male Expansion Header ................................................................ 16

23 BOOSTXL-ULN2003 Mode Overview ................................................................................... 17

24 3-Pin Mode Abbreviated Schematic (Zoom for Higher Resolution).................................................. 18

25 8-Pin Mode Abbreviated Schematic (Zoom for Higher Resolution).................................................. 19

26 BOOSTXL-ULN2003 Schematic (Zoom for Higher Resolution)...................................................... 21

List of Figures

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List of Figures

3

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List of Tables

1 J1 and J2 Connector Pinout Description ................................................................................. 8

2 Dip Switch Description ...................................................................................................... 9

3 LED Description ............................................................................................................ 10

4 Description of Hardware Changes ....................................................................................... 20

4

List of Tables

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BOOSTXL-ULN2003 Dual Stepper Motor Driver

BoosterPack Hardware

1 Introduction

1.1 BOOSTXL-ULN2003 Dual Stepper Motor Driver BoosterPack Overview

The BOOSTXL-ULN2003 provides an easy-to-use development board to interface with up to two unipolar stepper motors using any Launchpad in the Launchpad Ecosystem. This user’s guide details a hardware description of the BoosterPack, how to interface the BoosterPack with external hardware, various modes of operation, and additional features.

The BOOSTXL-ULN2003 allows for the control of eight high-current (up to 500 mA per channel), high voltage (up to 30 V), sink outputs. These outputs are controlled either through a serial (3-pin) or parallel (8-pin) mode. Using the BOOSTXL-ULN2003 in serial 3-pin mode allows for control of two unipolar stepper motors while only requiring 3 General-Purpose Input/Output (GPIO) pins, ultimately allowing for flexibility in design and reduction in the number of GPIO pins required.

The BOOSTXL-ULN2003 can not only be used to provide an interface to unipolar stepper motors, but also can be used in the following applications.

• Relay Driving

• Solenoid Driving

• LED Driving

• High-Voltage Logic Level Shifting For additional information regarding these applications, see What is a Peripheral Driver? Applications and

Design Considerations.

The Boosterpack is not limited to one specific application at a time, but can be used for all of these applications simultaneously. For example, one BoosterPack could enable driving one stepper motor, driving one relay, driving two LEDs, and shifting a 3.3-V logic signal to a 24-V logic signal at the same time.

User's Guide

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Figure 1. BOOSTXL-ULN2003 Connected to MSP-EXP430F5529LP

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J1, J3 Standard

BoosterPack Header

J

2 , J

4 Standard

BoosterPack Header

Header for Other Dev Board Compatibility

Dev Board

Hardware Description

2 Hardware Description

2.1 Top and Bottom View

Figure 2 is a top view of the BOOSTXL-ULN2003, and Figure 3 is a bottom view of the

BOOSTXL-ULN2003.

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Figure 2. Top View of BOOSTXL-ULN2003 Figure 3. Bottom View of BOOSTXL-ULN2003

2.2 Board Overview

Figure 4 shows an overview of the BOOSTXL-ULN2003 BoosterPack. The main features such as devices,

switches, connectors, and LEDs are highlighted. See Section 2.4 for additional details regarding each section.

Figure 4. BOOSTXL-ULN2003 Top Side Overview

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VCC

3V3

MSP430

Launchpad

40-pin

BoosterPack

Interface

ULN2003A

+

CSD17571Q2

SN74HC595

CH1-4 + Vcc

[Motor 1] [4 Relays]

[4 LEDs]

CH5-8 + Vcc

[Motor 2] [4 Relays]

[4 LEDs]

3-Pin Mode

Dip Switches (x4)

8-Pin Mode

Dual Stepper Motor Driver BoosterPack

BOOSTXL-ULN2003

Inputs

Outputs

Motor Supply

-

+

AGND

VIN

+

5V+3V3

-

DGND

VIN

5V

Power OR-ing

VCC

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2.3 Block Diagram

Figure 5 details a block diagram of the BOOSTXL-ULN2003 BoosterPack. The 40-pin BoosterPack

header allows the BoosterPack to be interfaced with any LaunchPad in the MSP430 LaunchPad ecosystem. See ti.com/launchpad for a list of all available MSP430 LaunchPads. A row of four switches allow the user to choose between a parallel, direct-drive (8-pin) mode and a serial (3-pin) mode of control of the ULN2003A.

The ULN2003A is a 7-channel Darlington pair array that is used to drive motors, solenoids, LEDs, or relays. See the ULN2003A product folder for additional overview regarding this device. The CSD17571Q2 is a TI N-Channel NexFET Power MOSFET that is paired with the ULN2003A in order to enable an eighth output channel. See the CSD17571Q2 product folder for additional overview regarding this device. The SN74HC595 shift register enables the 3-pin control mode, ultimately reducing the number of GPIOs required for driving eight output channels. See the SN74HC595 product folder for additional overview regarding this device. See Section 4 for additional information on how to select between 3-pin mode and 8-pin mode.

Hardware Description

Figure 5. BOOSTXL-ULN2003 Block Diagram

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Hardware Description

2.4 Connector, Switch, and LED Descriptions

2.4.1 Connectors

The signal assignment on the BoosterPack pin connectors is shown in Figure 6. The J1-J4 descriptions on the BoosterPack follow the J1-J4 convention for the Launchpad ecosystem. See ti.com/launchpad for further description of the 40-pin BoosterPack standard.

Only the outer two pin columns, J1 and J2 (highlighted in red below) are required for BoosterPack operation, the inner 2 columns, J3 and J4, are provided to pass signals from any 40-pin Launchpad to other BoosterPack boards that may require these pins. The additional headers, J0, J5, and J6 are for interfacing with other development boards. See Section 3.3 for details regarding connecting to other development boards.

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(1) Pins with no name/description are not connected. Pins with the same name/description are shorted together. (2) *~ These pins are not required for BoosterPack operation. (3) * These pins are not connected out of the box. To enable control of this board through these pins, see

Section 4.3.1.

(4) ~ This pin is connected to IN4 out of the box. This allows for channels IN1-IN4 to be driven directly using 8-

pin parallel mode. A resistor is connected to protect the line from bus contention if 3-pin mode is being used and this pin is being used for another purpose.

Figure 6. BOOSTXL-ULN2003 2x20 Header Description

Table 1. J1 and J2 Connector Pinout Description

Direction Pin Name Pin Number Pin Number Pin Name Direction

POWER VDD J1.1 J2.20 DGND POWER

INPUT GP2* J1.2 J2.19

INPUT GP6* J1.6 J2.15

INPUT GP8~ J1.8 J2.13 GP13 INPUT INPUT GP9* J1.9 J2.12 GP12 INPUT INPUT GP10* J1.10 J2.11 GP11 INPUT

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BOOSTXL-ULN2003 Dual Stepper Motor Driver BoosterPack Hardware

J1.3 J2.18 J1.4 J2.17 J1.5 J2.16

J1.7 J2.14

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GP11 GP12 GP13

SRCLK

IN3

RCLK

IN2

SER

IN1

OE

DGND

3V3

3

1

2

6

4

5

S2

3

1

2

6

4

5

S1

560

R11

560

R12

560

R13

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2.4.2 Switches

The four on-board dip switches are used to select between 3-pin mode and 8-pin mode operation of the BoosterPack. Descriptions for each of the switches are provided in Table 2.

Hardware Description

Figure 7. Board Image of Switches

Figure 8. Schematic View of Switches

Table 2. Dip Switch Description

Reference Description

This SPDT switch directs the signal from BoosterPack header input GP11. If the switch is down, it connects GP11 to the SER input of the SN74HC595. If the switch is up, it

S1 - GP11

S1 - GP12

S2 - GP13

S2 - HC595

connects GP11 directly to IN1 – ultimately connected to the gate of the CSD17571Q2 FET. Switch Down = 3-pin Serial Mode Switch Up = 8-pin Parallel Mode

This SPDT switch directs the signal from BoosterPack header input GP12. If the switch is down, it connects GP12 to the RCLK input of the SN74HC595. If the switch is up, it connects GP12 directly to IN2 – ultimately connected to 1B of the ULN2003A device. Switch Down = 3-pin Serial Mode Switch Up = 8-pin Parallel Mode

This SPDT switch directs the signal from BoosterPack header input GP13. If the switch is down, it connects GP13 to the SRCLK input of the SN74HC595. If the switch is up, it connects GP13 directly to IN3 – ultimately connected to the 2B of the ULN2003A device. Switch Down = 3-pin Serial Mode Switch Up = 8-pin Parallel Mode

This SPDT switch connects the OE pin either to 3V3 or DGND. This determines whether or not the SN74HC595 outputs are enabled or are in high-impedance (Hi-Z) mode. If the switch is down, it enables the SN74HC595 outputs. If the switch is up, it disables the SN74HC595 outputs. Disabling these outputs is required for 8-pin Parallel Mode to avoid bus contention at the inputs of the ULN2003A and the CSD17571Q2 FET. Switch Down = 3-pin Serial Mode Switch Up = 8-pin Parallel Mode

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Green

12

D1

Green

12

D2

Green

12

D3

Green

12

D4

DGND

IN1 IN2 IN3 IN4

0

R5

1.0k

R1

1.0k

R7

1.0k

R3

1.0k

R4

Hardware Description

2.4.3 LEDs

The four on-board LEDs provide visual feedback for the IN1 through IN4 signals. When operating in 3-pin mode these LEDs are driven by the SN74HC595, and when operating in 8-pin mode these LEDs are being driven directly by the MSP430 GPIO pins.

If the user wants to disable the onboard LEDs, resistor R5 can be removed. Additional details are found in

Section 2.6.2.

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Figure 9. Board Image of LEDs Figure 10. Schematic View of LEDs

Reference Description

D1

D2

D3

D4

Table 3. LED Description

D1 is connected to the signal IN1. D1 is on when IN1 is high, and is off when IN1 is low. When IN1 is high, M1_CH1 is activated – ultimately being pulled to AGND as the CSD17571Q2 inverts the logic signal.

D2 is connected to the signal IN2. D2 is on when IN2 is high, and is off when IN2 is low. When IN2 is high, M1_CH2 is activated – ultimately being pulled to AGND as the ULN2003A inverts the logic signal.

D3 is connected to the signal IN3. D3 is on when IN3 is high, and is off when IN3 is low. When IN3 is high, M1_CH3 is activated – ultimately being pulled to AGND as the ULN2003A inverts the logic signal.

D4 is connected to the signal IN4. D4 is on when IN4 is high, and is off when IN4 is low. When IN4 is high, M1_CH4 is activated – ultimately being pulled to AGND as the ULN2003A inverts the logic signal.

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VCC

AGND DGND

0

R15

1µF

C1

D7

VIN

1 2

J9

5V

D8

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2.5 Powering the BOOSTXL-ULN2003

2.5.1 Powering the On-Board Devices

The BoosterPack is designed to accept power from a connected Launchpad. The 3.3 V line from the Launchpad is required to power the SN74HC595 device. The 3.3 V line from the LaunchPad cannot source enough current to power motors, relays, or LEDs, so an additional source of power is required as described in Section 2.5.2.

2.5.2 Powering the Motor or Other Peripherals

The method of powering the external peripherals is dependent upon the LaunchPad being used in addition to the output current requirements.

For higher current or voltage applications, the external motor supply pins should be connected to an external supply as shown in Figure 11. The maximum voltage supplied through these pins should not exceed 30 V, or permanent damage to components may occur. While there is some protection against reverse polarity included on the board, note the correct orientation of the motor supply pins to avoid permanent damage to the board.

Hardware Description

Figure 11. External Supply Connected to Motor Supply Pins

As shown in Figure 12, the VCC connected to the motor peripheral to provide power is created by using power OR-ing diodes.

• If there is no 5-V line available from the LaunchPad, the motor supply is required to power the external peripherals.

• If there is a 5-V line connected, and no motor supply is connected, the VCC pins provide a voltage close to 5 V.

• If there is a 5-V line connected, and the motor supply voltage is connected and greater than 5 V, the motor supply is used to power any external peripherals.

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Figure 12. On-Board Power OR-ing

BOOSTXL-ULN2003 Dual Stepper Motor Driver BoosterPack Hardware

11

Hardware Description

Some LaunchPad boards have a 5-V supply pin, which is powered directly from the USB port. This supply can be used to power peripherals, as shown in Figure 13, but there are some exceptions to when this can be used (See the following NOTE). The 5-V stepper motor used in Figure 13 below has the following DigiKey Part Number: 1528-1366-ND. A 12-V version of this stepper motor has the following Digi-Key Part Number: 1528-1367-ND.

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Figure 13. USB Powering a Single Motor (See NOTE)

NOTE: When using the 5-V pin (USB Power) to provide power to an external peripheral, TI does not

recommend to exceed 250 mA, and further caution should be taken when powering additional BoosterPacks. TI does not recommend to power more than one stepper motor from this board when using the 5-V LaunchPad power pin.

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ULN2803A

ULN2003A

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2.6 Other Hardware Highlights

2.6.1 Additional Device Compatibility

While the board initially comes populated with a ULN2003A device, this board is compatible with many other pin-to-pin devices that perform a similar function. As shown in Figure 14, the Boosterpack has the landing pattern for both the 16-pin D (SOIC) as well as the 18-pin DW (WIDE SOIC) package. Figure 15 shows the Boosterpack populated with the ULN2803A device.

If the ULN2003A device is depopulated, the following list of devices can be populated in order to be evaluated.

• ULQ2003A - –40°C to +105°C Temperature Range

• ULQ2003-Q1 - Automotive Qualified Variant

• ULN2003LV - FET based variant

• ULN2003V12 - Wider-Voltage FET based variant

• ULN2803 - 8 channel variant

• TPL7407L - FET based variant with 40V outputs and drive circuitry to decrease power dissipation

Hardware Description

Figure 14. BoosterPack With ULN2003A Figure 15. BoosterPack With ULN2803A

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Hardware Description

2.6.2 Disabling the On-Board LEDs

Figure 16 shows the section of the board with the LEDs. The R5 resistor is labeled LED ENABLE because

when a 0-Ω resistor is populated here, it allows a path for current flow through the LEDs. The on-board LEDs can be disabled easily by depopulating this R5 resistor. Figure 17 shows the resistor depopulated, so there is no longer a path for current to flow through the LEDs, thereby disabling them.

Figure 16. Board Image of LED Section Figure 17. LED Section With R5 Depopulated

2.6.3 Enabling Quick Inductor Discharge

The ULN2003A has internal flyback diodes to suppress voltage spikes due to inductive kickback. Stepper Motors and relays have inductive kickback that is suppressed by these internal diodes. The rate of discharge of the inductor is also directly proportional to the voltage across the inductor when discharging.

Figure 18 shows the section of the board near the COM pin of the ULN2003A device. Diode D5, also

labeled Flyback COM diode, is a 12-V Zener diode that is in series with the internal flyback diodes of the ULN2003A. Normally there is a 0-Ω resistor (R14) in parallel with this Zener diode, also labeled Diode Bypass, effectively bypassing the Zener diode. To enable the quick inductor discharge, the Diode Bypass resistor (R14) should be depopulated. Figure 19 shows the board with this resistor depopulated, ultimately enabling quick inductor discharge.

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Figure 18. Board Image of COM Diode Section Figure 19. COM Diode Section With R14 Depopulated

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3 Interfacing With External Hardware

3.1 Connecting to a LaunchPad

The BoosterPack is ready to connect to any LaunchPad out of the box. Figure 20 shows the correct orientation of the BoosterPack on the LaunchPad.

The connectors should be aligned carefully as misalignment could cause permanent damage to the BoosterPack.

Interfacing With External Hardware

CAUTION

Figure 20. BoosterPack Connected to MSP430F5529 LaunchPad

3.2 Connecting a Motor or Other Peripherals

The Boosterpack provides two standard 100 mil spacing female receptacles to interface two unipolar stepper motors or other peripherals such as relays, solenoids, or LEDs.

Each receptacle provides a six-pin interface. Four pins are dedicated to the outputs of the ULN2003A and CSD17571Q2 to drive the peripheral, and two pins are connected to the motor supply that is connected to the board. These two VCC pins allow for connection to both 5-pin and 6-pin type Unipolar stepper motors.

Figure 21 shows two 5-pin unipolar motors connected to the BoosterPack.

Figure 21. BoosterPack With Two Stepper Motors

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Interfacing With External Hardware

As shown in Figure 22, a male to male header can also be added to the receptacle to help interface with standard 5-pin or 6-pin unipolar stepper motors with female receptacles.

Figure 22. BoosterPack with Motor and Male Expansion Header

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3.3 Connecting to Other Development Boards

The BoosterPack is compatible with Arduino development boards, but some additional hardware is required beyond what is supplied in the box. The following list shows the additional required materials. These must be populated on the BoosterPack to enable a hardware interface with the development board.

• J0 Male Pin Header

• J5 Male Pin Header

• J6 Male Pin Header

Once the additional headers are populated, the BoosterPack can be connected to the development board.

NOTE: The BoosterPack must be placed on the development board upside down for the pins to

align properly.

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4 Functional Modes

4.1 Modes of Operation Overview

Figure 23 provides a brief overview of how the Boosterpack pins are connected to either the SN74HC595

or the ULN2003A based on the selected mode of operation. Additional details for 3-pin mode and 8-pin mode can be found in Section 4.2 and Section 4.3 respectively.

Functional Modes

(1) *There are NO resistors populated for pins GP6, GP2, GP9, and GP10, therefore there will be no direct

connection to IN5, IN6, IN7, and IN8 respectively. 0 Ohm or solder bridge connections can be made to connect these pins in order to enable the full functionality of 8 pin mode. See Section 4.3.1 for additional details

(2) ~There IS a resistor populated for pin IN4, therefore it can be used in 8-pin mode without bus contention;

however, in 3-pin mode it will draw current if GP8 is set low. The resistor allows IN4 and GP8 to be different voltage levels when GP8 is being used for another purpose while the Boosterpack is in 3-pin mode. See

Section 4.2.1 for additional details.

Figure 23. BOOSTXL-ULN2003 Mode Overview

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GP12

DGND

GP13

GP11

QB

1

QC

2

QD

3

QE

4

QF

5

QG

6

QH

7

GND

8

QH'

9

SRCLR

10

SRCLK

11

RCLK

12

OE

13

SER

14

QA

15

VCC

16

U1

SN74HC595DR

VCC

AGND

Green

12

D1

Green

12

D2

Green

12

D3

Green

12

D4

VCC

AGND

VCC

3

5,6,84,7

1,2,

Q1 CSD17571Q2

DGND

0.1 µF

C3

IN1

0

R14

DGND

TP1

TP2

TP3

TP4

0.1 µF

C2

IN1

IN2

IN3

IN4

IN5

IN6

IN7

IN8

IN1 IN2 IN3 IN4

3V3

DGND

1B

1

2B

2

3B

3

4B

4

5B

5

6B

6

7B

7

GND

8

COM

9

7C

10

6C

11

5C

12

4C

13

3C

14

2C

15

1C

16

U2

ULN2003ADR

1 2 3 4 5 6

J7

1 2 3 4 5 6

J8

M1_CH1

M1_CH2

M1_CH3

M1_CH4

M2_CH5

M2_CH6

M2_CH7

M2_CH8

COM

AGND

VCC

0

R5

DGND

0

R15

COM

1µF

C1

D7

DB2W40200L

D6 DB2W40200L

VIN

1 2

J9

12V

D5

5V

D8

DB2W40200L

1.0k

R1

1.0k

R7

1.0k

R3

1.0k

R4

Launchpad Inputs

Motor/Peripheral Outputs

Functional Modes

4.2 3-pin Serial Mode

4.2.1 Enabling 3-pin Mode

The BoosterPack has all of the required components to run 3-pin Mode out of the box. To enable this mode of operation, the four dip switches should be in the lower position. Each switch works as defined in

Table 2.

4.2.2 3-pin Mode of Operation

Figure 24 shows the effective schematic for the 3-pin mode of operation. Inputs GP11, GP12, and GP13

from the microcontroller are used to drive the inputs of the SN74HC595 device. This 8-bit shift register converts the serial input data to parallel output data to control the ULN2003A channels. For example software to drive the SN74HC595, see Section 5.2.

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BOOSTXL-ULN2003 Dual Stepper Motor Driver BoosterPack Hardware

Figure 24. 3-Pin Mode Abbreviated Schematic (Zoom for Higher Resolution)

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GP13

GP12

GP11

VCC

AGND

Green

12

D1

Green

12

D2

Green

12

D3

Green

12

D4

VCC

AGND

VCC

3

5,6,84,7

1,2,

Q1 CSD17571Q2

DGND

0.1 µF

C3

IN1

0

R14

TP1

TP2

TP3

TP4

IN1

IN2

IN3

IN4

IN5

IN6

IN7

IN8

IN1 IN2 IN3 IN4

1B

1

2B

2

3B

3

4B

4

5B

5

6B

6

7B

7

GND

8

COM

9

7C

10

6C

11

5C

12

4C

13

3C

14

2C

15

1C

16

U2

ULN2003ADR

1 2 3 4 5 6

J7

1 2 3 4 5 6

J8

M1_CH1

M1_CH2

M1_CH3

M1_CH4

M2_CH5

M2_CH6

M2_CH7

M2_CH8

COM

AGND

VCC

0

R5

DGND

0

R15

COM

1µF

C1

D7

DB2W40200L

D6 DB2W40200L

VIN

1 2

J9

12V

D5

5V

D8

DB2W40200L

1.0k

R1

1.0k

R7

1.0k

R3

1.0k

R4

GP10

GP9

GP8

GP6

GP2

560

R8

0

R6

0

R2

0

R9

0

R10

560

R13

560

R12

560

R11

Launchpad Inputs

Motor/Peripheral Outputs

X

DNP

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4.3 8-pin Parallel Mode

4.3.1 Enabling 8-pin Mode

The BoosterPack has the required components to run ONLY 4 pins of the 8-pin Mode out of the box. Ultimately, this allows control of a single stepper motor in a parallel control mode, so additional components are required to enable control of all 8 outputs in parallel mode. To use 8-pin mode, the four dip switches should be in the upper position. Each switch works as defined in Table 2.

To enable all 8 pins for this mode of operation, a 0-Ω resistor or solder bridge should be populated on the pads for resistors R6, R2, R9, and R10 to enable IN5, IN6, IN7, and IN8 respectively.

NOTE: The 560-Ω resistors exist on IN1, IN2, IN3, and IN4 to help protect against bus contention if

the IN1, IN2, IN3, and IN4 pins are being driven by both the SN74HC595 and the microcontroller. This should only happen if the dip switches are in the wrong position. If the intent is to use the device in the 8-pin mode, and the switches are set properly, then there should be no potential for bus contention, and therefore 560-Ω resistors are not required for R6, R2, R9, and R10.

4.3.2 8-pin Mode of Operation

Figure 25 shows the effective schematic for the 8-pin mode of operation. Inputs GP11, GP12, GP13, GP8,

GP6, GP2, GP9, and GP10 from the microcontroller are used to drive the inputs of the ULN2003A device directly. For example software to drive unipolar stepper motors using the ULN2003A, see Section 5.2.

Functional Modes

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Figure 25. 8-Pin Mode Abbreviated Schematic (Zoom for Higher Resolution)

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Additional Information

5 Additional Information

5.1 Design Files

All design files including schematics, layout, Bill of Materials (BOM), Gerber files, and documentation are made available in the Texas Instruments Resource Explorer:

dev.ti.com/tirex

The schematic for the design is also attached as Figure 26 to the end of the document for quick reference.

5.2 Software

For software examples including the out-of-box experience, 3-pin mode driving, and 8-pin mode driving, see dev.ti.com/BOOSTXL-ULN2003.

For additional information regarding stepper motor driving patterns, including half-step, full-step, and wave drive, see Stepper Motor Driving with Peripheral Drivers (Driver ICs)

5.3 Hardware Change Log

PCB Revision Description of Changes

Rev 1.0

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Table 4. Description of Hardware Changes

• Initial Release

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QB

1

QC

2

QD

3

QE

4

QF

5

QG

6

QH

7

GND

8

QH'

9

SRCLR

10

SRCLK

11

RCLK

12

OE

13

SER

14

QA

15

VCC

16

U1

SN74HC595DR

COM

10

1B

1

2B

2

3B

3

4B

4

5B

5

6B

6

7B

7

8B

8

GND

9

8C

11

7C

12

6C

13

5C

14

4C

15

3C

16

2C

17

1C

18

U3

ULN2803ADW

GPIO !

31

GPIO !

32

GPIO !

33

GPIO !

34

Timer_Cap/GPIO !

35

Timer_Cap/GPIO !

36

PWM/GPIO !

37

PWM/GPIO !

38

PWM/GPIO !

39

PWM/GPIO !

40

GPIO !

11

SPI_CS/GPIO !

12

SPI_CS/GPIO !

13

SPI_MISO

14

SPI_MOSI

15

RST

16

GPIO

17

GPIO !

18

PWM/GPIO !

19

GND

20

J2/J4

SSQ-110-03-T-D

+3.3V

1

Analog_In

2

LP_UART_RX

3

LP_UART_TX

4

GPIO !

5

Analog In

6

SPI_CLK

7

GPIO !

8

I2C_SCL

9

I2C_SDA

10

+5V

21

GND

22

Analog_In

23

Analog_In

24

Analog_In

25

Analog_In

26

Analog_In/I2S_WS

27

Analog_In/I2S_SCLK

28

Analog_Out/I2S_SDout

29

Analog_Out/I2S_SDin

30

J1/J3

SSQ-110-03-T-D

VCC

AGND

Green

12

D1

Green

12

D2

Green

12

D3

Green

12

D4

GP8

GP13

GP12

GP11

GP10

GP11 GP12 GP13

DGND

VCC

AGND

VCC

3

5,6,84,7

1,2,

Q1 CSD17571Q2

DGND

3V3

0.1µF

C3

IN1

0

R14

DGND

TP1

TP2

TP3

TP4

GP2

GP10

GP9

GP6

GP9

GP8

GP6

GP2

SRCLK

IN3

RCLK

IN2

SER

IN1

SER

SRCLK

RCLK

5

4

1 2 3

6 7 8

J0

5 4

1

2

3

J6

0.1µF

C2

IN4 IN1

IN2

IN3

IN4

IN5

IN6

IN7

IN8

IN1 IN2 IN3 IN4

IN6

IN5

IN7

IN8

3V3

DGND

OE

DGND

3V3

1B

1

2B

2

3B

3

4B

4

5B

5

6B

6

7B

7

GND

8

COM

9

7C

10

6C

11

5C

12

4C

13

3C

14

2C

15

1C

16

U2

ULN2003ADR

5

4

1 2 3

6 7 8 9

10

J5

IN1

IN2

IN3

IN4

IN5

IN6

IN7

IN8

AGND

COM

M2_CH8

M2_CH7

M2_CH6

M2_CH5

M1_CH4

M1_CH3

M1_CH2

M1_CH1

1 2 3 4 5 6

J7

1 2 3 4 5 6

J8

M1_CH1

M1_CH2

M1_CH3

M1_CH4

M2_CH5

M2_CH6

M2_CH7

M2_CH8

COM

AGND

VCC

3

1

2

6

4

5

S2

3

1

2

6

4

5

S1

0

R5

DGND

3V3

0

R15

GP10

GP9

GP8

GP6

GP2

COM

1µF

C1

3V3

D7

DB2W40200L

D6 DB2W40200L

VIN

1 2

J9

12V

D5

5V

D8

DB2W40200L

1.0kR11.0kR71.0kR31.0k

R4

560

R11

560

R12

560

R13

560

R8

560

R6

560

R2

560

R9

560

R10

X

DNP

X

DNP

X

DNP

X

DNP

X

DNP

X

DNP

X

DNP

X

DNP

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Additional Information

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5.4 Schematic

Figure 26. BOOSTXL-ULN2003 Schematic (Zoom for Higher Resolution)

NOTE: DNP is an abbreviation for do not populate. Components highlighted as DNP in the schematic are not populated out of the box.

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Additional Information

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