Texas Instruments C2000 LED BoosterPack User manual

C2000 LED BoosterPack

User's Guide

Literature Number: SPRUHH9

July 2012

Contents

1 C2000™ LED BoosterPack Overview ..................................................................................... 4

1.1 Overview .................................................................................................................. 4

2 Getting Familiar With the Kit ................................................................................................. 5

2.1 Kit Contents .............................................................................................................. 5

2.2 Kit Specifications ........................................................................................................ 5

3 Hardware Overview ............................................................................................................. 5

3.1 Subsystems .............................................................................................................. 6

3.2 Powering the Board ..................................................................................................... 7

3.3 Boot Modes .............................................................................................................. 8

4 Getting Started ................................................................................................................... 8

4.1 PC GUI Demo ........................................................................................................... 8

4.2 Capacitive Touch Demo .............................................................................................. 10

5 Hardware Resource Mapping .............................................................................................. 12

5.1 Resource Allocation ................................................................................................... 12

5.2 Jumpers, Connectors, and Switches ................................................................................ 13

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List of Figures

1 LED BoosterPack (BOOSTXL-C2KLED) ................................................................................ 4

2 Lighting System Topology ................................................................................................. 5

3 LED BoosterPack Circuit Diagram........................................................................................ 6

4 LED BoosterPack Subsytem Locations.................................................................................. 7

5 LED BoosterPack GUI ..................................................................................................... 9

6 GUI Setup Connections Window........................................................................................ 10

7 LED BoosterPack With C2000 LaunchPad and MSP430 Capacitive Touch BoosterPack...................... 11

8 LED BoosterPack Circuit Diagram ...................................................................................... 13

9 LED BoosterPack Jumper, Connector, and Switch Locations....................................................... 14

List of Tables

1 Boot Options................................................................................................................. 8

2 PWM and ADC Resource Allocation.................................................................................... 12

3 Description of Jumpers, Connectors, and Switches .................................................................. 13

SPRUHH9–July 2012 List of Figures

User's Guide

SPRUHH9–July 2012

C2000 LED BoosterPack

1 C2000™ LED BoosterPack Overview

1.1 Overview

The LED BoosterPack is an add-on board designed to fit the C2000 LaunchPad and the other 40-pin

based LaunchPads. This BoosterPack provides users with a way to accurately control a series of LED

strings while efficiently controlling the power stages needed to make the LEDs work. This user's guide

discusses the LED BoosterPack kit contents, the board hardware details, and also explains the functions

and locations of jumpers and connectors present on the board. Step-by-step instructions for two demo

examples are also included.

Figure 1. LED BoosterPack (BOOSTXL-C2KLED)

C2000, LaunchPad, controlSUITE, Code Composer Studio are trademarks of Texas Instruments.

Microsoft is a registered trademark of Microsoft Corporation in the United States and/or other countries.

All other trademarks are the property of their respective owners.

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DC/DC

stages LED strings

input

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Getting Familiar With the Kit

2 Getting Familiar With the Kit

2.1 Kit Contents

The kit consists of:

• LED BoosterPack

• AC/DC Power Adapter (12 V 1A)

• Quick Start Guide

2.2 Kit Specifications

The LED BoosterPack has the following specifications:

• Power Input:

– 6 V minimum @ 1.2A

– 20 V maximum @ 360 mA

• Boost Stages (each):

– Input

• 6 V minimum @ 400 mA

• 20 V maximum @ 120 mA

– Output

• 24 V nominal @ 100 mA

3 Hardware Overview

Figure 2 illustrates a LED lighting system running from DC power.

Figure 2. Lighting System Topology

There are multiple ways of controlling LEDs. This board uses the C2000 devices to control a separate DC

supply for each of the LED strings. Brightness control is accomplished using the C2000 devices by

independently varying the output power of each DC/DC stage. This allows the user to control the average

current passing through each LED string. Since average current is roughly proportional to lumen output,

each LED string’s brightness is controlled. Figure 3 shows the circuit diagram for the LED BoosterPack.

SPRUHH9–July 2012 C2000 LED BoosterPack

Vin-12v

Boost V-boost1

V-boost2

V-boost6

I-Led6 I-Led2 I-Led1

F28027

3V3

Comms

CPU

32 bit

DSP core

60 MHz

I C

SPI

UART

ADC

12 bit

4.6 MSPS

I-Led1

I-Led2

I-Led8

V-boost1

V-boost6

V-sepic1

V-sepic2

1A / 1B

2A / 2B

3A / 3B

4A / 4B

PWM1(HR)

PWM2(HR)

PWM3(HR)

PWM4(HR)

Vref

Hardware Overview

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Figure 3. LED BoosterPack Circuit Diagram

3.1 Subsystems

The LED BoosterPack board is divided into functional groups referred to as subsystems. The following is a

list of the subsystems present on the board and brief descriptions of each:

•Power Supplies – Power is supplied to the board via a 12 V AC/DC wall adapter. This power is

stepped down using the Buck regulator to generate 5 V. The 5 V is used to power a 3.3 V LDO that

supplies power to the 3.3 V device present on the BoosterPack. Both the 3.3 V and 5 V power

domains can be selectively jumpered (via J2 and J8, respectively) to supply power to the

LaunchPadXL headers.

•Boost Converters – Boost converters are used to step up the 12 V input voltage to a voltage high

enough to forward bias the LEDs. The boost converters are driven by the EPWM peripheral present on

the F28027 device on the C2000 LaunchPad™.

•Current Feedback – Shunt resistors at the base of each LED string are used to convert the LED

current into a voltage that can be measured. The voltage from the sense resistors is passed to a set of

op-amps to amplify and filter the current feedback signal. They also serve the purpose of driving the

analog-to-digital converter (ADC) inputs.

•MSP430 Capacitive Touch – The LED BoosterPack includes an MSP430 device and headers such

that a Capacitive Touch BoosterPack can be plugged into the LED BoosterPack and used to control

the LEDs. Switch S1 can be used to connect or disconnect the MSP430’s serial peripheral to the

F28027 device’s serial peripheral present on the C2000 LaunchPad. If the user wishes to use the

capacitive touch demo, ensure S1 is in the up position while S4 on the LaunchPad is in the down

position.

– Advanced users can reprogram the MSP430 present on the LED BoosterPack by using J5.

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Hardware Overview

Figure 4 illustrates the position of these subsystems on the board. The use of a subsystem approach, for

different power stages, enables easy debug and testing of one stage at a time.

Figure 4. LED BoosterPack Subsytem Locations

3.2 Powering the Board

The LED BoosterPack has three separate power domains and two major modes of operation: two power

domains are the primary power rails that feeds the three DC/DC power stages and the auxiliary power

supply rails that power all of the support chips, and is used to power the LaunchPad. The question of

which mode of operation should be used depends on whether the board is being used for evaluation or for

experimentation.

• Non-Isolated – Used to quickly show how the boards function with the supplied firmware. Power for the

LaunchPad is supplied via the USB. Power for the LED BoosterPack is supplied via the included 12 V

AC/DC adapter. With this configuration, your PC’s USB port is connected to the same ground as both

the LaunchPad and LED BoosterPack.

– Jumpers JP1, JP2, and JP3 on the LaunchPad should have jumpers placed on each post.

– Jumpers J2 and J8 on the LED BoosterPack should NOT have jumpers placed on each post.

– Connect the USB to the LaunchPad.

– Connect the included power adapter to the LED BoosterPacks’ J1.

SPRUHH9–July 2012 C2000 LED BoosterPack

Getting Started

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• Isolated/Standalone – Used to protect the host PC while debugging the application, which may present

dangerous voltages to a PC or when the user wants to run a standalone application with a single

supply. Power for the entire system (both LaunchPad and LED BoosterPack) is supplied from the 12 V

AC/DC wall adapter. The USB can be optionally connected if the user wants to debug the application;

in this case, power for the emulator is supplied via USB. This mode provides the user with 2500 Vrms

of isolation to protect the computer in the event that dangerous transient voltages are present on the

board.

– Jumpers JP1, JP2, and JP3 on the LaunchPad should NOT have jumpers placed on each post.

– Jumpers J2 and J8 on the LED BoosterPack should have jumpers placed on each post.

– Connect the USB (optional, only used for debugging) to the LaunchPad.

– Connect the included power adapter to the LED BoosterPacks’ J1.

3.3 Boot Modes

Table 1 describes the switch settings that are needed for emulation boots as well as booting from FLASH

or SCI for the board.

Table 1. Boot Options

Emulation Boot Boot From FLASH Boot From SCI

SW1 on LaunchPad SW1 on LaunchPad SW1 on LaunchPad

Position 1 = up Position 1 = up Position 1 = up

F2802x Position 2 = up Position 2 = up Position 2 = down

Position 3 = up Position 3 = down Position 3 = down

4 Getting Started

4.1 PC GUI Demo

The LED BoosterPack experimenter’s kit comes with a GUI that provides a convenient way to evaluate the

functionality of this kit and the F28027 device without having to learn and configure the underlying project

software. The interactive interface using sliders, buttons, and textboxes allows LED lighting with the

C2000 device to be demonstrated quickly and easily.

4.1.1 Hardware Setup for PC GUI Demo

Perform or verify the following steps to prepare the LED BoosterPack for use with the included GUI:

1. Verify the following jumper and switch settings on the LED BoosterPack.

(a) A jumper is not placed on J2.

(b) A jumper is not placed on J8.

2. Verify the following jumper and switch settings on the C2000 LaunchPad:

(a) A jumper is placed on JP1.

(b) A jumper is placed on JP2.

(d) Switches in S1 are all in the up position.

(e) The switch S4 is in the up position.

3. Insert a C2000 LaunchPad into the header marked J3, J9 and J4, J10.

4. Connect the LED BoosterPack to the included power adapter and plug in the adapter to the mains

power.

5. Connect the LaunchPad to the PC using the USB cable included with the C2000 LaunchPad.

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Getting Started

4.1.2 Software Setup for PC GUI Demo

The GUI for evaluating this kit is named LED_BOOST_PC_GUI.exe and can be found in the C2000

LaunchPad controlSUITE™ package. This GUI is all the software necessary to do a quick evaluation of

this kit. To explore deeper, the underlying reference software can be found within controlSUITE.

NOTE: The GUI requires Microsoft®.NET framework 3.0 to run. Please ensure that this software is

installed prior to running this program.

If this demo is being used on a computer that uses a decimal comma, the regional settings of

the computer may need to be changed to English for this demo to run correctly.

Follow these instructions to run the GUI included with the LED BoosterPack:

1. Start Code Composer Studio™ version 5.

2. In TI Resource Explorer, look for an entry called controlSUITE and expand the Development Tools

section.

3. Expand the entry for BOOSTXL-C2KLED and look for the PC GUI application project. Follow the steps

in the right pane of Resource Explorer to import, compile, program, and run the embedded half of this

example.

4. Browse to and run the LED_BOOST_PC_GUI.exe GUI. The program shown in Figure 5 should

appear. This executable resides next to the embedded example application in Resource Explorer.

Figure 5. LED BoosterPack GUI

SPRUHH9–July 2012 C2000 LED BoosterPack

Getting Started

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5. Click Setup Connection and make sure the baud rate is set to 57600 and that the Boot on Connect

box is unchecked.

Figure 6. GUI Setup Connections Window

6. Select the serial COM port. This can be found by going to:

Control Panel →System →Hardware tab →Device Manager →Ports(COM and LPT)

Look for the COM port that is named USB Serial Port (or similar) and note the number. Select this

COM port in the Setup Connection window and click OK to close the window. Hint: Try selecting the

largest number or refreshing the list while connecting or disconnecting the USB cable to or from the

board to see which one changes.

7. Click Connect in the GUI main window. The status bar at the bottom left corner of the GUI turns green

and says Connected once the GUI is connected.

8. Use the Color Presets provided or manually adjust the current level for each LED string to vary the

color generated by each LED array.

9. When finished, set each LED string’s Target Current to 0.00A and press Disconnect to terminate the

connection.

4.2 Capacitive Touch Demo

The LED BoosterPack experimenter’s kit comes with an MSP430 device and headers such that a user

can connect the Capacitive Touch BoosterPack and use it to control the LEDs. This interface is meant to

demonstrate how an OEM lighting company might implement touch-based control of LED lighting

applications.

No external hardware is required to run this demo, which makes it a great demo to show when one is

away from a PC. To explore deeper, the underlying reference software can be found within controlSUITE.

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