Texas Instruments OPT3002EVM Manuel utilisateur

SBOU160–May 2016

OPT3002EVM User's Guide

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User's Guide

SBOU160–May 2016

OPT3002EVM User's Guide

This user’s guide describes the characteristics, operation, and use of the OPT3002 evaluation module

(EVM). This user's guide discusses how to set up and configure the software and hardware, and reviews

various aspects of the program operation. Throughout this document, the terms evaluation board,

evaluation module, and EVM are synonymous with the OPT3002EVM. This document also includes an

electrical schematic, printed circuit board (PCB) layout drawings, and a parts list for the EVM.

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OPT3002EVM User's Guide

Contents

1 Overview ..................................................................................................................... 3

1.1 Kit Contents.......................................................................................................... 3

1.2 Related Documentation from Texas Instruments............................................................... 4

2 Hardware...................................................................................................................... 4

2.1 Theory of Operation ................................................................................................ 5

2.2 Hardware Overview................................................................................................. 5

3 Software....................................................................................................................... 7

3.1 Hardware Requirements........................................................................................... 7

3.2 Software Installation................................................................................................ 7

3.3 Launching the Software............................................................................................ 8

3.4 Software Operation................................................................................................. 9

4 Schematic, PCB Layout, and Bill of Materials.......................................................................... 12

4.1 Schematic .......................................................................................................... 12

4.2 PCB Layout ........................................................................................................ 13

4.3 Bill of Materials .................................................................................................... 14

List of Figures

1 Hardware Included With OPT3002EVM Kit .............................................................................. 3

2 Hardware Setup.............................................................................................................. 4

3 OPT3002 Test Board Block Diagram ..................................................................................... 5

4 Typical Hardware Connection.............................................................................................. 6

5 Typical Response After Connecting OPT3002EVM to the Computer ................................................ 6

6 OPT3002EVM Software-Installation Launch............................................................................. 7

7 Software-Installation Prompts.............................................................................................. 7

8 Main Operation Screen ..................................................................................................... 8

9 Hardware Error Message................................................................................................... 8

10 Power Indicators ............................................................................................................. 9

11 Default I2C Address Selection.............................................................................................. 9

12 Register x00 Button and Recorded Values............................................................................. 10

13 Register x01 Control and Status Register Bits ......................................................................... 10

14 Registers x02 and x03 LSB Limit Controls ............................................................................. 10

15 Simulated Screen Backlight Dimmer .................................................................................... 10

16 Weighted LSB vs. Sample Number Plot ................................................................................ 11

17 Re-Initialize Button......................................................................................................... 11

18 Data Logging Setup and Enable ......................................................................................... 12

19 OPT3002 Test-Board Schematic......................................................................................... 12

20 PCB Top Layer ............................................................................................................. 13

21 PCB Bottom Layer ......................................................................................................... 13

22 PCB Top-Layer Assembly Drawing...................................................................................... 14

23 PCB Bottom-Layer Assembly Drawing.................................................................................. 14

List of Tables

1 Kit Contents................................................................................................................... 3

2 Related Documentation..................................................................................................... 4

3 OPT3002 Test Board Parts List ......................................................................................... 14

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Overview

SBOU160–May 2016

OPT3002EVM User's Guide

1 Overview

The OPT3002 is an ambient light sensor (ALS) with a digital output integrated circuit. The OPT3002 uses

a two-wire interface that works with the I2C protocol, making this device ideal for many applications. The

OPT3002EVM is a platform for evaluating the performance of the OPT3002 under various conditions. The

OPT3002EVM consists of two PCBs. The first PCB is the SM-USB-DIG board that communicates with the

computer, provides power, and sends and receives appropriate digital signals. The second PCB is the

OPT3002 test board that contains the OPT3002 device and its support circuitry.

1.1 Kit Contents

Table 1 summarizes the contents of the OPT3002EVM kit. Figure 1 shows the included hardware. Contact

the Texas Instruments Worldwide Customer Support Center nearest you if any component is missing. It is

highly recommended that you also check the OPT3002 product folder on the TI web site at www.ti.com to

verify you have the latest versions of the released software.

Table 1. Kit Contents

Item Quantity

OPT3002 test board 1

SM-USB-DIG board 1

USB extension cable 1

Figure 1. Hardware Included With OPT3002EVM Kit

Overview

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1.2 Related Documentation from Texas Instruments

The following documents provide information regarding Texas Instruments' integrated circuits used in the

assembly of the OPT3002EVM. This user's guide is available from the TI web site under literature number

SBOU160. Any letter appended to the literature number corresponds to the document revision that is

current at the time of the writing of this document. For the latest revision, click the link in Table 2. The

latest revision is also available from the TI website at www.ti.com, the Texas Instruments' Literature

Response Center at (800) 477-8924, and the Product Information Center at (972) 644-5580. When

ordering, identify the document by both title and literature number.

Table 2. Related Documentation

Document Literature Number

OPT3002 product data sheet SBOS745

SM-USB-DIG Platform user's guide SBOU098

2 Hardware

Figure 2 shows the system setup for the OPT3002EVM. The computer runs the graphical user interface

(GUI) software that communicates with the SM-USB-DIG over a USB connection. The SM-USB-DIG

translates the USB commands from the computer into power, I2C, SPI™, and general-purpose

input/output (GPIO) commands for the OPT3002 test board. The OPT3002EVM does not require any

additional components to operate.

Figure 2. Hardware Setup

OPT3002

VDUT Supply

(Switched 3.3-V Power)

I2C Interface

10-Pin, Female

SM-USB-DIG

Connector

Interrupt

Five

100-mil-Spaced

Test Points

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Hardware

SBOU160–May 2016

OPT3002EVM User's Guide

2.1 Theory of Operation

A block diagram of the OPT3002 test board hardware is shown in Figure 3. The OPT3002 test board

contains connections for the power, I2C, and an interrupt signal. For evaluation purposes, the board also

has a 5-pin header that allows the OPT3002 test board to be connected to hardware other than the SM-

USB-DIG Platform.

Figure 3. OPT3002 Test Board Block Diagram

2.2 Hardware Overview

If not already assembled, the basic hardware setup for the OPT3002EVM involves connecting the

OPT3002 test board to the SM-USB-DIG Platform, and then connecting the USB cable. This section

presents the details of this procedure.

CAUTION

Many of the components on the OPT3002EVM are susceptible to damage by

electrostatic discharge (ESD). Customers are advised to observe proper ESD

handling precautions when unpacking and handling the EVM, including the use

of a grounded wrist strap at an approved ESD workstation.

Hardware

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2.2.1 Typical Hardware Setup

Connect the right-angle female socket on the OPT3002 test board to the right-angle male header on the

SM-USB-DIG Platform, as shown in Figure 4. Take special care to make sure that the two 10-pin sockets

directly align with each other. Plug the female USB-A cable to the SM-USB-DIG Platform, and then plug

the male USB-A cable into the computer.

NOTE: Always connect the two boards together before connecting the USB cable to avoid any

issues if the connectors are misaligned.

Figure 4. Typical Hardware Connection

Figure 5 shows the typical response when the SM-USB-DIG is plugged into the USB port of the computer

for the first time. Typically, the computer responds with a Found New Hardware, USB Device pop-up

dialog window. The pop-up window then typically changes to Found New Hardware, USB Human Interface

Device. This pop-up indicates that the device is ready to be used. The SM-USB-DIG Platform uses the

human interface device drivers that are part of the Windows®operating system.

Figure 5. Typical Response After Connecting OPT3002EVM to the Computer

In some cases, the Add Hardware Wizard appears. If this installation prompt occurs, allow the device

manager to install the human interface device drivers by clicking Yes at each request to install the drivers.

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Software

SBOU160–May 2016

OPT3002EVM User's Guide

3 Software

This section describes the installation and operation of the OPT3002EVM software.

3.1 Hardware Requirements

The OPT3002EVM software has been tested on the Windows 7®operating system (OS) with United

States regional settings. The software should function correctly on other Windows operating systems.

3.2 Software Installation

The OPT3002EVM software is available through the OPT3002EVM Product Folder on the TI web site

(www.ti.com). To install the software to your computer, launch the OPT3002EVM installation file,

setup_OPT3002_EVM.exe.

The OPT3002EVM software then begins the installation process, as shown in Figure 6.

Figure 6. OPT3002EVM Software-Installation Launch

Follow the prompts shown in Figure 7 to install the OPT3002EVM software. After the prompts, the

OPT3002EVM GUI software completes installation.

Figure 7. Software-Installation Prompts

Software

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3.3 Launching the Software

With the OPT3002EVM properly connected (see Figure 4), launch the EVM GUI software from the

Windows Start menu by navigating to the folder titled Texas Instruments and clicking on the OPT3002

EVM application. The software launches with a screen similar to that shown in Figure 8.

Figure 8. Main Operation Screen

If the message shown in Figure 9 appears when the OPT3002EVM GUI software is launched, disconnect

all components of the OPT3002EVM kit, and repeat the hardware assembly and connection instructions.

Figure 9. Hardware Error Message

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Software

SBOU160–May 2016

OPT3002EVM User's Guide

3.4 Software Operation

This section primarily discusses software operation and basic GUI functionality, and gives a description of

the various tabs.

3.4.1 Getting Started

With the hardware properly connected, and the EVM software installed and operating, make sure that the

power to the device is turned on by checking the LED on the SM-USB-DIG board and the VDUT indicator

on the SM-USB-DIG tab in the GUI software, as shown in Figure 10. The GUI has a primary window that

is used to configure and read from the OPT3002EVM, along with a secondary window used to access

different features of the OPT3002EVM.

Figure 10. Power Indicators

If the hardware address of the OPT3002EVM on the EVM board has not been reconfigured, then the

address fields shown on the SM-USB-DIG tab are set by default, as shown in Figure 11.

Figure 11. Default I2C Address Selection

To quickly start using the device, leave the default settings selected, click the Write Reg x01 button, and

then click the Run Continuously flip switch. The software then begins capturing data from the device. This

quick-start procedure is a good test to make sure everything is operational. To stop the computer from

capturing data and plotting, click Run Continuously again.

Software

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3.4.2 Feature Descriptions

the OPT3002 data sheet) to compute the output, labeled Reg x00 in Figure 12. Click the Read Reg x00

button to update these fields and the plot with the latest values from the OPT3002EVM.

Figure 12. Register x00 Button and Recorded Values

names and full descriptions are shown in the OPT3002 data sheet.Figure 13 shows the control and status

appropriate value. All the read-only status bits have an associated small, blue indicator. Two buttons are

provided to operate register x01 because some of the bits have read and write capability. The Full Scale

Range selection field has four identical automatic range modes: 0x0C, 0x0D, 0x0E, and 0x0F. Also, the

Mode selection field has two identical continuous sampling options: 0x02 and 0x03.

Figure 13. Register x01 Control and Status Register Bits

Registers x02 and x03 enforce low and high limits, respectively, on the output ranges (exponent) and

values (mantissa) from the OPT3002. These registers are programmed using the appropriate fields, as

shown in Figure 14. Change the values of the data in these fields to write and read the values from the

OPT3002. No button press is required; however, make sure to exit the text field for the field to update.

Figure 14. Registers x02 and x03 LSB Limit Controls

There is a simulated screen backlight dimmer represented by a rectangle, shown in Figure 15. This

rectangle changes from black, through 254 shades of grey, to white, depending on the value of the output

measured by the OPT3002. The rectangle shows a brighter backlight for high-output situations, and a dim

backlight for low-output situations. The low limit (darkest backlight) is always 0, and the high limit

(brightest backlight) can be adjusted with the LSB for White numeric field.

Figure 15. Simulated Screen Backlight Dimmer

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