Texas Instruments OPT3005DTSEVM User manual

User's Guide
Light Sensor Evaluation Modules
ABSTRACT
This user’s guide describes the characteristics, operation, and use of the OPT light sensor evaluation modules
(OPTEVM). The user's guide details 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 OPT light sensor EVM (OPTEVM). This document also includes an
electrical schematic, printed circuit board (PCB) layout drawings, and a parts list for the EVM.
This user's guide is applicable for the following devices:
Table 1-1. Devices Supported
Device Description
OPT3005DTSEVM Ambient Light Sensor (ALS) for Video Surveillance Cameras
OPT4001DTSEVM High-Speed, High-Resolution, Digital Ambient Light Sensor (ALS)
OPT4048DTSEVM High-Speed, High-Precision Tristimulus XYZ Color Sensor
OPT4001DNPQ1EVM Automotive High-Speed, High-Resolution, Digital Ambient Light Sensor (ALS)
Table of Contents
1 Overview..................................................................................................................................................................................3
1.1 OPTEVM Kit Contents....................................................................................................................................................... 3
1.2 Related Documentation from Texas Instruments............................................................................................................... 4
2 OPTEVM Hardware Overview................................................................................................................................................ 5
3 OPTEVM Software...................................................................................................................................................................6
3.1 Hardware Requirements.................................................................................................................................................... 6
3.2 Software Installation...........................................................................................................................................................6
3.3 Typical OPTEVM Hardware Setup...................................................................................................................................10
3.4 Launching the OPT300x/4xxxEVM Software................................................................................................................... 11
3.5 OPTEVM Software Operation.......................................................................................................................................... 13
3.6 Controls............................................................................................................................................................................14
3.7 OPTxxxDTSEVM Variants................................................................................................................................................15
3.8 Scripts Window................................................................................................................................................................ 17
4 Schematic, PCB Layout, and Bill of Materials................................................................................................................... 20
4.1 Coupon Board.................................................................................................................................................................. 20
4.2 Motherboard.....................................................................................................................................................................23
5 Troubleshooting....................................................................................................................................................................27
5.1 Microsoft Windows 7 Manual Driver Installation.............................................................................................................. 27
6 Revision History................................................................................................................................................................... 33
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List of Figures
Figure 1-1. Hardware Included with OPTEVM Kit....................................................................................................................... 3
Figure 2-1. OPTEVM Hardware Setup........................................................................................................................................ 5
Figure 3-1. OPT3004DTSEVM Software-Installation File............................................................................................................6
Figure 3-2. OPTEVM Software-Installation Launch.....................................................................................................................6
Figure 3-3. OPTEVM Software-Installation Prompts................................................................................................................... 7
Figure 3-4. OPTEVM Software-Installation Prompts................................................................................................................... 7
Figure 3-5. OPTEVM Software-Installation Prompts................................................................................................................... 8
Figure 3-6. OPTEVM Software-Installation Prompts................................................................................................................... 8
Figure 3-7. OPTEVM Software-Installation Prompts................................................................................................................... 9
Figure 3-8. OPTEVM Software-Installation Prompts................................................................................................................... 9
Figure 3-9. Typical Hardware Connection................................................................................................................................. 10
Figure 3-10. Typical Response After Connecting OPTEVM to the Computer........................................................................... 10
Figure 3-11. OPTEVM Main Operation Screen..........................................................................................................................11
Figure 3-12. Hardware Error Message...................................................................................................................................... 12
Figure 3-13. GUI Capture Running (single channel)................................................................................................................. 13
Figure 3-14. OPT4048DTSEVM CIE XY Window..................................................................................................................... 15
Figure 3-15. OPT4048DTSEVM Lux Live Window....................................................................................................................16
Figure 3-16. OPT4048DTSEVM Channel Live Window............................................................................................................ 16
Figure 3-17. Latte Scripts Window.............................................................................................................................................17
Figure 3-18. Registers View Example for OPT4xxx Devices.....................................................................................................19
Figure 4-1. OPT3004 Coupon Board Schematic....................................................................................................................... 20
Figure 4-2. PCB Top Layer........................................................................................................................................................ 21
Figure 4-3. PCB Bottom Layer...................................................................................................................................................21
Figure 4-4. PCB Top-Layer Assembly Drawing......................................................................................................................... 22
Figure 4-5. PCB Bottom-Layer Assembly Drawing....................................................................................................................22
Figure 4-6. OPTMB EVM Board Schematic.............................................................................................................................. 23
Figure 4-7. PCB Top Layer........................................................................................................................................................ 24
Figure 4-8. PCB Bottom Layer...................................................................................................................................................24
Figure 4-9. PCB Top-Layer Assembly Drawing......................................................................................................................... 25
Figure 4-10. PCB Bottom-Layer Assembly Drawing..................................................................................................................25
Figure 5-1. OPTEVM on Microsoft® Windows® 7 With Drivers not Installed............................................................................. 27
Trademarks
Windows 10®, Microsoft®, and Windows® are registered trademarks of Microsoft Corporation.
All trademarks are the property of their respective owners.
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1 Overview
Texas Instruments has multiple families of light sensor parts. This EVM user's guide supports all the devices
listed above. Each of these parts is a light sensor integrated circuit (IC) with a digital output and works with
the I2C protocol; making the device an excellent choice for many applications. The OPTEVM is a platform for
evaluating the performance of the multiple light sensor IC under various conditions. The OPTEVM consists of
two PCBs. The first PCB is the OPTMB EVM board that communicates with the computer, provides power, and
sends and receives appropriate digital signals. The second PCB is the OPTCB coupon board, which contains
the light sensor IC for evaluation and support circuitry.
1.1 OPTEVM Kit Contents
Table 1-1 summarizes the contents of the OPTEVM kit. Figure 1-1 shows the included hardware. Contact the
nearest Texas Instruments Product Information Center if any component is missing. TI highly recommends to
check the Light Sensor product folder on the TI web site at www.ti.com for the latest versions of the released
software.
Table 1-1. OPTEVM Kit Contents
Item Quantity
Coupon board with OPT300x/4xxx IC
(Installed on OPTMBEVM) 1
OPTMBEVM board 1
USB type A to type C cable 1
Figure 1-1. Hardware Included with OPTEVM Kit
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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 OPTEVM. This user's guide is available from the TI web site under literature number SBOU293.
Any letter appended to the literature number corresponds to the document revision that is current at the time of
the writing of this document. The latest revision can be found by clicking the link and is also available from the
TI web site, the Texas Instruments' Literature Response Center at [phone], and the Product Information
Center at [phone]. When ordering, identify the document by both title and literature number.
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2 OPTEVM Hardware Overview
Figure 2-1 shows the system setup for the OPTEVM. The computer runs the graphical user interface (GUI)
software that communicates with the OPTMB EVM board over a USB connection. The OPTMB EVM board
has a USB Type C port and ships with a USB-C to USB-A cable. The OPTMB EVM board acts as a bridge
between the software running on the PC and the OPTCB coupon board. The MSP430 on the OPTMB EVM
board receives USB commands from the PC and communicates with the light sensor over I2C.
The OPTCB coupon board consists of the light sensor IC, decoupling capacitor, and 8 pins. The pins create
connections for the power, I2C, and an interrupt signal between the OPTCB coupon board and the OPTMB EVM
board. For evaluation purposes, the OPTCB coupon board can be removed from the OPTMB EVM board to use
with other platforms. The OPTMB EVM board also has an unpopulated 5-pin header footprint for easy access to
the supply, ground, I2C, and interrupt lines.
The EVM ships with the OPTCB coupon board plugged into the motherboard. If not already assembled, then the
basic hardware setup for the OPTEVM involves plugging the coupon board into the OPTMB EVM board socket.
Take special care to make sure the OPTCB coupon board is oriented correctly as shown in Figure 1-1. Then
connect the USB cable. This section presents the details of this procedure.
CAUTION
Many of the components on the OPTEVM are susceptible to damage by electrostatic discharge
(ESD). Customers are advised to observe proper ESD handling precautions when unpacking and
handling the OPTEVM, including the use of a grounded wrist strap at an approved ESD workstation.
Figure 2-1. OPTEVM Hardware Setup
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3 OPTEVM Software
This section describes the installation and operation of the OPTEVM software. An OPTEVM uses the TI Latte
software, which is available for download on the EVM page.
3.1 Hardware Requirements
The OPTEVM software has been tested on the Windows 10® operating system (OS) with United States regional
settings. The software functions correctly on other Windows XP, Windows Vista, Windows 7 and Windows 8.
3.2 Software Installation
The OPTEVM software is available through the light sensor IC Product Folder on the TI web site (www.ti.com).
The product folder is named corresponding to the specific device part number. To install the software to your
computer, navigate to the OPTEVM software. For example, the OPT4001DTS IC is called OPT4001DTSEVM.
Open the installer directory. Launch the installation file, for example: OPT4001DTS_EVM_Latte.exe, as shown in
the figure below.
Figure 3-1. OPT3004DTSEVM Software-Installation File
The OPTEVM software then begins the installation process, as shown in Figure 3-2.
Figure 3-2. OPTEVM Software-Installation Launch
Follow the prompts as shown in Figure 3-3 to Figure 3-8 to install the OPTEVM software.
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Figure 3-3. OPTEVM Software-Installation Prompts
Figure 3-4. OPTEVM Software-Installation Prompts
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Figure 3-5. OPTEVM Software-Installation Prompts
Figure 3-6. OPTEVM Software-Installation Prompts
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Figure 3-7. OPTEVM Software-Installation Prompts
Figure 3-8. OPTEVM Software-Installation Prompts
The OPTEVM GUI software is now installed.
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3.3 Typical OPTEVM Hardware Setup
Plug the male USB-C cable to the OPTMB EVM board and then plug the male USB-A cable into the computer.
The green light lights up on the EVM as shown in the figure below.
Figure 3-9. Typical Hardware Connection
The figure below shows the typical response when the OPTEVM 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.
Figure 3-10. Typical Response After Connecting OPTEVM to the Computer
Connect the EVM via USB to the PC. If Windows shows a notification that a driver is not found for the device
connected, then see the instructions to manually install drivers in Section 5.1 before proceeding.
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3.4 Launching the OPT300x/4xxxEVM Software
With the OPTEVM properly connected, launch the Latte OPTEVM GUI software from the Windows Start menu.
The software launches with a screen similar to that shown in Figure 3-11. The exact GUI screen varies based on
the EVM variant. This section describes the following devices.
Table 3-1. Section Supported Devices
OPT4001EVM
OPT4001DTSEVM
OPT3005DTSEVM
OPT4048DTSEVM
OPT4001DNPQ1EVM
Details on additional variants are covered in the following section though the software operation is the same for
each variant.
Figure 3-11. OPTEVM Main Operation Screen
If the message shown in Figure 3-12 appears when the OPTEVM GUI software is launched, then this means
that the OPTMB EVM board was not detected. The device name varies according to the OPTEVM selected.
Check the USB connection and that the OPTMB EVM board appears in the device manager as shown. A green
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light appears on the motherboard if the motherboard is receiving power from the PC and the GUI Start Capture
button has not been clicked.
Figure 3-12. Hardware Error Message
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3.5 OPTEVM Software Operation
This section primarily discusses how to operate the OPTEVM software. The GUI has a primary window that is
used to configure and read from the OPTEVM, along with two other windows that are used to access different
features of the OPTEVM. Basic GUI functionality and a description of the tabs are also presented in this section.
3.5.1 Getting Started
To quickly start using the device, click the Operation Select on the drop-down menu and select Continuous to
bring the device out of power-down mode. Then click Start Capture to begin data capture. The green LED on the
motherboard turns off. Lux data appears above the lux plot as shown. The plot also starts to populate with the
device lux readings.
Figure 3-13. GUI Capture Running (single channel)
If the GUI is not responsive, then check the other Latte scripts window, which is minimized by default. If the
message Operation I2C Register Read for command [REGRx01] Failed. is displayed, then this means that the
light sensor IC or the OPTCB board is not detected by the motherboard. Verify the OPTCB board is plugged in
and properly oriented.
3.5.2 Feature Descriptions
3.5.2.1 Lux Plot
For all single channel EVMs (non-color EVMs), the device outputs a single value (for example, a lux reading
indicating the ambient light level). In the center of the GUI window, there is a plot showing the lux reading from
the device on the y-axis and the sample number on the x-axis. The plot settings can be tweaked by right clicking
on the plot. The x-axis and y-axis options under the right-click menu allow the range of x and y-axes displayed to
be changed. There is also an auto option that dynamically changes the range to match the data. Scrolling zooms
in to or zooms out from the plot. Left-clicking and dragging displays a yellow rectangle that, upon releasing
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the mouse, zooms the data to the rectangle drawn. Right-clicking and dragging up or down zooms the y-axis.
Right-clicking and dragging right or left zooms the x-axis. Right clicking and selecting View All resets the view.
For color EVMs, each channel output is displayed on the same plot with the readings at the top of the window
updated to display one reading per channel instead of a single reading as shown in Figure 3-16.
3.5.2.2 Mean, Std, and the Blue Slider
There is a blue slider on the lux plot shown on the right side of the plot in the Figure 3-13. The Mean and Std
columns in the table where capture data is displayed are calculated from only the data within the blue slider.
Left-clicking on the middle of this slider and dragging moves the slider. Left-clicking on the edge of either side
of the slider and dragging adjusts the size of the slider. This allows the mean and standard deviation of the
distance, phase, and amplitude to be computed for any continuous portion of the displayed data. If capture is
running this data updates in real-time along with the data in the Live column.
3.6 Controls
3.6.1 Capture Controls
3.6.1.1 Start Capture and Stop Capture
At the top left of the plot are two buttons. The Start Capture button begins capturing data based on the capture
controls, device controls, and operations controls section below the two buttons. The Stop Capture button ends
the process for capturing data
3.6.1.2 Display Sample Count
The Display Sample Count drop-down selector selects how many samples are displayed on the x-axis of the
plot.
3.6.1.3 Save to File
The Set Save to File Name check box allows the data captured in the GUI to be dumped to a CSV file. Clicking
this check box displays a windows file selector screen. Select the directory to store the CSV and set the name
for the CSV. After clicking sSave in the pop up window, press the Start Capture button to start saving data and
click the Stop Capture button to copy all the data into the indicated CSV file. When capturing data with save
enabled, the GUI initially dumps the data to temporary .npy files. After clicking Stop Capture, this data is written
over to the CSV file and .npy files removed.
3.6.2 Device Controls
3.6.2.1 Mode Select
The Mode Select drop-down menu changes the device gain range setting mode. The device supports automatic
gain control (AGC), which is the recommended mode setting for most use cases, or the gain range of the device
can be selected manually using this drop-down menu.
3.6.2.2 Conversion Time
The device supports 12 conversion times: ranging from 600 μs to 800 ms, which can be selected using the
respective drop-down menu. Each conversion time shows the number of resolution bits obtainable with that
conversion time.
3.6.3 Operation Controls
3.6.3.1 Operation Select
The Operation Select drop-down menu allows the device operating mode to be switched between the PWRDN,
continuous, oneshot (AGC), and oneshot modes. PWRDN is the power-down or standby mode where the
device enters a low power state. There is no active light sensing or conversion in the mode. Continuous mode
measures and updates the output registers continuously determined by the conversion time. Oneshot keeps the
device in standby mode and a conversion is triggered by an interrupt (INT Pin) or a timer measurement. This
mode uses auto-range selection logic from the previous selection to decide the range for the current trigger.
Oneshot (AGC) keeps the device is standby mode and a conversion is triggered by an interrupt (INT Pin) or a
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timer measurement. In this mode, every oneshot trigger forces a full reset on the auto-ranging control logic and a
fresh auto-range detection is initiated ignoring the previous measurements.
3.6.3.2 Measurement/Capture Trigger
The Measurement/Capture Trigger drop-down menu allows the device measurement and capture trigger to
be switched between the INT Pin/Timer, Timer/Timer, Timer/INT Pin, and Timer/INT PinBy2 modes. This can
only be selected when operating in oneshot (AGC) or oneshot mode. INT Pin/Timer has an input to trigger a
measurement. Since the INT pin is used as input, there is no hardware interrupt to indicate thE completion of
measurement, so a timer is used to keep time from the trigger measurement and read out output registers. With
a timer measurement, the next measurement is set by the timer and the INT Pin, INT PinBy2 (every second INT
Pin) or the timer can indicate measurement completion to read out output registers.
3.6.3.3 Oneshot Time (μs)
The oneshot time slider sets the timer duration while using oneshot (AGC) and oneshot mode.
3.7 OPTxxxDTSEVM Variants
With different OPTEVM variants that are listed in Table 1-1, there are slight differences in the GUI. Most of the
controls, such as the capture controls, the device controls, and the operations, control are the same. Additional
details for the OPTEVM variants are listed below.
Table 3-2. Section Supported Devices
OPT4048DTSEVM
3.7.1 OPT4048DTSEVM
The OPT4048DTSEVM GUI launches with three window options.
3.7.1.1 OPT4048DTSEVM CIE XY Window
The CIE XY window shows the CIE 1931 color space in both XY and UV in graph form. The black dot represents
the color sensed by the OPT4048 as shown in Figure 3-14.
Figure 3-14. OPT4048DTSEVM CIE XY Window
3.7.1.2 OPT4048DTSEVM Lux Live Window
The Lux Live window, shown in Figure 3-15, shows the live lux value sensed by the OPT4048 across the sample
count.
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Figure 3-15. OPT4048DTSEVM Lux Live Window
3.7.1.3 OPT4048DTSEVM Channel Live Window
The Channel Live window, shown in Figure 3-16, shows the live register codes of each channel around the
sample count.
Figure 3-16. OPT4048DTSEVM Channel Live Window
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3.8 Scripts Window
When Latte is launched, the GUI window appears front and center. However, there is a second window that
is minimized at launch. This is the scripts window and exposes some more advanced features of the Latte
platform. See Figure 3-17.
Figure 3-17. Latte Scripts Window
The scripts window also provides access to the device registers view that displays the stored value of the device
registers and is able to be changed directly. Launch the registers view by double-clicking on the Registers View
button under the Device List box on the right side of the screen.
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3.8.1 Additional Features of the Scripts Window
3.8.1.1 Hidden IDE Window
The Latte program runs a number of python scripts in the background to capture and display data from the EVM.
These scripts allow for initialization of the device including loading calibration data from the EVM flash memory,
launching a live view window with measurement plot and readings, and additional functionality such as reading
from the flash and selecting a specific LED current for the device to use. For advanced users or users looking
for more flexibility when using the OPTEVM, these python scripts are available in an integrated development
environment (IDE) window that is minimized when TI-Latte is launched. The IDE window allows advanced users
to customize the existing scripts or write new scripts.
After launching Latte, expand the light sensor directory on the left hand side of the window under Files by
clicking the triangle to the left of the directory name. This displays the light sensor folder. Further expanding the
light sensor folder displays all the example scripts as shown in Figure 3-17.
3.8.1.2 devInit.py
Open the devInit.py script by clicking on the corresponding file in the light sensor folder on the left side of the
screen. This displays the contents of the script on the center of the window. With devInit.py still selected in
TI-Latte, click Run>Buffer from the top menu bar of TI-Latte (or press F5) to run the script. Once completed, the
live view GUI is opened in a new window. More details on the live view GUI are given in the following section.
Additional info is also displayed in the log window in the lower left- hand corner of the main window.
3.8.1.3 04-launchGUI.py
A live view GUI window is launched when running the devInit.py script. This window allows data from the
OPTEVM to be viewed on a graph in real time. The GUI is created in the launchGUI.py example script. When
running devInit.py, the launchGUI.py script is automatically run. However, if the GUI window is closed, then the
window can be re-launched by directly running the launchGUI.py script. To do this, select the launchGUI.py
script and click Run>Buffer or press F5.
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3.8.2 Overview of Device Registers: OPT4xxx Devices
Figure 3-18. Registers View Example for OPT4xxx Devices
Registers E, R_MSB, R_LSB, C and X are the result registers for single channel devices with registers 0x02
through 0x07 as FIFO registers. The result register provides the output data from the device as an exponent and
mantissa value indicated as e and r in the register view. The mantissa is split between registers 0x00 and 0x01
as R_MSB and R_LSB. A sample counter (C) and CRC check bits (X) are also contained in register 0x01.
For color sensors, registers 0x00 through 0x07 are the result registers for each channel.
Registers 0x0A, 0x0B, and 0x0C are the configuration registers and provide feedback about the state of the
device; the bit names and full descriptions are shown in the device data sheet. Each of the read-only status bits
are grayed out and cannot be changed. Registers x08 and x09 allow low and high limits, respectively, to be set.
These registers are used in certain interrupt reporting modes. The Design_ID is contained in register 0x11.
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4 Schematic, PCB Layout, and Bill of Materials
4.1 Coupon Board
4.1.1 Schematic
Figure 4-1 shows the schematic of the OPT3004DTS coupon board. C1 is a bypass capacitor for device VDD.
For other OPT300x/4xxx device variants, the pinout and schematic are the same except for the change to the IC
in the BOM.
Figure 4-1. OPT3004 Coupon Board Schematic
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