Texas Instruments DLP NIRscan EVM User manual

DLP®NIRscan™ Evaluation Module

User's Guide

Literature Number: DLPU016C

April 2014–Revised April 2019

2DLPU016C–April 2014–Revised April 2019

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Contents

Preface ........................................................................................................................................ 5

1 DLP NIRscan Evaluation Module Overview.............................................................................. 8

1.1 Introduction ................................................................................................................... 8

1.2 What is in the DLP NIRscan EVM? ....................................................................................... 8

1.2.1 Optical Engine ..................................................................................................... 10

1.2.2 DLP NIRscan EVM Electronics.................................................................................. 12

1.3 Other Items Needed for Operation....................................................................................... 14

1.4 DLP NIRscan Connections................................................................................................ 14

1.5 DLP NIRscan EVM Jumpers.............................................................................................. 16

2 Quick Start ........................................................................................................................ 18

2.1 Power-Up the DLP NIRscan EVM ....................................................................................... 18

3 Operating the DLP NIRscan EVM.......................................................................................... 20

3.1 Quick Scan Mode .......................................................................................................... 21

3.2 Custom Scan Mode........................................................................................................ 23

3.3 Slew Scan Mode ........................................................................................................... 28

3.4 File Download Icon ........................................................................................................ 32

3.5 System Information ........................................................................................................ 32

A Safety ............................................................................................................................... 34

A.1 Warnings and Cautions.................................................................................................... 34

B Power Supply Requirements................................................................................................ 35

B.1 External Power Supply Requirements................................................................................... 35

C NIRscan EVM Reprogramming Procedure ............................................................................. 36

C.1 Creating a bootable microSD Card ...................................................................................... 36

C.2 Reprogramming the DLP NIRscan EVM Application Software....................................................... 36

C.3 Upgrading the DLPC350 Firmware ...................................................................................... 39

Revision History.......................................................................................................................... 40

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DLPU016C–April 2014–Revised April 2019

List of Figures

1. DLP NIRscan Evaluation Module ......................................................................................... 6

1-1. DLP NIRscan EVM Block Diagram........................................................................................ 9

1-2. DLP NIRscan EVM Optical Engine ...................................................................................... 10

1-3. 0.45-Inch DMD Diamond Pixel Geometry............................................................................... 11

1-4. 0.45-Inch DMD Diamond Pixel Array Configuration ................................................................... 11

1-5. Diamond Pixel for Vertical, Horizontal, and Diagonal Lines .......................................................... 12

1-6. DLP NIRscan EVM......................................................................................................... 13

1-7. DLP NIRscan EVM Connectors (Backside View)...................................................................... 15

1-8. DLP NIRscan Connectors (Upside-Down Side View) ................................................................. 15

1-9. DLP NIRscan Jumper Locations ......................................................................................... 16

2-1. DLP NIRscan Homepage ................................................................................................. 19

3-1. Quick Scan Screen......................................................................................................... 21

3-2. Example Quick Scan....................................................................................................... 22

3-3. Example Quick Scan Spectrum Data.................................................................................... 23

3-4. Custom Scan Screen ...................................................................................................... 24

3-5. Example Custom Scan .................................................................................................... 26

3-6. Example Custom Scan Spectral Data................................................................................... 27

3-7. Example Custom Scan Raw Data ....................................................................................... 28

3-8. Slew Scan Screen.......................................................................................................... 29

3-9. Eample Slew Scan......................................................................................................... 31

3-10. File Download Screen ..................................................................................................... 32

3-11. Information Screen......................................................................................................... 33

C-1. MicroSD Card Slot ......................................................................................................... 37

C-2. Boot Switch Location ...................................................................................................... 38

C-3. LED Location................................................................................................................ 39

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List of Tables

1-1. DLP NIRscan EVM Specifications ....................................................................................... 11

1-2. DLP NIRscan EVM Components......................................................................................... 14

1-3. DLP NIRscan Connections................................................................................................ 15

DLPU016C–April 2014–Revised April 2019

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Preface

DLPU016C–April 2014–Revised April 2019

Read This First

The DLP®NIRscan™ EVM is a third-party implementation of the next generation DLP reference design to

enable faster development cycles for spectrometer applications requiring small form factors.

Trademarks

NIRscan, Sitara are trademarks of Texas Instruments.

DLP is a registered trademark of Texas Instruments.

Safari is a registered trademark of Apple Inc.

Digi-Key is a registered trademark of Digi-Key Corporation.

Google is a trademark of Google Inc.

Internet Explorer is a registered trademark of Microsoft Corporation.

Mozilla Firefox is a registered trademark of Mozilla Corporation.

Sullins Connector Solutions is a registered trademark of Sullins Connector Solutions, Inc.

About This Guide

This guide is an introductory document for the DLP NIRscan EVM that provides an overview of the system

and the systems software. Other documents provide more in-depth information of the hardware and

software features of the components of the DLP NIRscan EVM.

This document covers DLP NIRscan Software version 2.0 - version 2.0 is an update to version 1.0 which

adds the Slew Scan mode and Custom Scan - Hadamard mode of operation. For instructions on how to

update the NIRscan software from version 1.0 to version 2.0, please see Appendix C of this document.

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Figure 1. DLP NIRscan Evaluation Module

Use the most recent versions of either Firefox, Safari, Google Chrome, or Internet Explorer. There are

some compatibility issues noted with IE8 and IE9 so these versions are not recommended.

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Related Documentation

DLPC350 data sheet: DLPC350 DLP Digital Controller for Portable Advanced Light Control,DLPS029

DLP4500NIR data sheet: DLP 0.45 WXGA NIR DMD,DLPS032

Programmer's guide: DLPC350 Programmer’s Guide,DLPU010

Design guide: DLP Spectrometer Design Considerations,DLPA049

Technical Support

Refer to the DLP and MEMS TI E2E community support forums.

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DLP NIRscan Evaluation Module Overview

Chapter 1

DLPU016C–April 2014–Revised April 2019

DLP NIRscan Evaluation Module Overview

1.1 Introduction

The DLP®NIRscan™ EVM is a complete evaluation module (EVM) to design a high performance,

affordable near-infrared spectrometer. This flexible tool contains everything a designer needs to start

developing a DLP-based spectrometer right out of the box. The EVM features the DLP 0.45 WXGA NIR

chipset. It is the first DLP chipset optimized for use with near-infrared (NIR) light. With DLP technology,

spectrometers for use in the food, pharmaceutical, oil and gas and other emerging industries are able to

deliver lab performance levels in the factory and the field. This technology brings together a set of

components providing an efficient and compelling spectroscopy system solution for:

• Process analyzers

• Laboratory equipment

• Dedicated analyzers

The new DLP4500NIR DMD is optimized for operation at wavelengths between 700 nm and 2500 nm. The

DLP NIRscan EVM is one possible implementation of this new DLP technology, operating from 1350 nm

to 2450 nm.

1.2 What is in the DLP NIRscan EVM?

The DLP NIRscan EVM is a complete NIR spectrometer EVM using DLP technology. The EVM package

includes:

• Near infrared optomechanical spectrometer engine:

– Transmissive sample holder with broadband visible-to-infrared tungsten-halogen lamp

– 25-µm input slit

– Collimating lenses

– 1300 to 2500 nm bandpass filter

– Reflective diffraction grating

– Focusing lens

– DLP4500NIR DMD (.45-inch WXGA, 912 × 1140 diamond pixels, NIR optimized)

– Collection optics

– 2-mm single-pixel, cooled InGaAs detector

• Electronics subsystem with the electronics consisting of five boards:

– Spectro board

• DLPC350 controller ASIC

• Sitara™ processor (AM3358) for system control and analysis

• Power management circuits

• Connectivity through Ethernet and USB

• Non-volatile eMMC flash memory

• Micro SD card slot for external programming

• Open source Linux web-server application software

– Detector board

• 2-mm, single-pixel cooled InGaAs detector with TEC and thermistor

• Low-noise differential amplifier circuit

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What is in the DLP NIRscan EVM?

DLPU016C–April 2014–Revised April 2019

DLP NIRscan Evaluation Module Overview

• ADS1255 30 kSPS analog-to-digital converter (ADC) with SPI interface

– Lamp driver board

• Low noise, constant current supply for the broadband lamp

– TEC driver board

• Thermistor feedback signal amplifier for temperature measurement

• Closed loop TEC current control with high current driver

– DMD interconnect board

– Associated cable harnesses

• Three disposable cuvettes, each 12.5 × 12.5 mm with 10-mm path length, for use during the

spectrometer evaluation.

Figure 1-1 shows the major hardware components.

Figure 1-1. DLP NIRscan EVM Block Diagram

What is in the DLP NIRscan EVM?

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DLP NIRscan Evaluation Module Overview

1.2.1 Optical Engine

The DLP NIRscan EVM spectrometer optical engine is mounted on top of a thermal plate which acts as a

stable platform for mounting the optics. The configuration is a post-dispersive architecture where the

broadband light from the tungsten lamp is directed through a transmissive sample. In this specific

implementation, the lamp or sample holder module allows insertion of standard cuvettes. These cuvettes

are designed to hold liquid samples. There is also a slit in the sample holder, which allows insertion of

various thickness NIR transmissive samples such as plastic sheets and coated glass.

Each sample passes (and absorb) a specific amount of NIR light through the sample. The amount passed

(and absorbed) depends on the molecular makeup of the material, and is specific to that material, similar

to a fingerprint. The light which passes through the sample enters the engine through the input slit. Slit

size is relative to the desired wavelength resolution of the spectrometer. This spectrometer uses a 25-µm

wide slit, which is approximately 4.2-mm tall. After light passes through the slit, the light then passes

through a collimating lens, through a 1350- to 2450-nm bandpass filter where the light then strikes a

reflective grating. This grating, in combination with the focusing lens, disperses the NIR wavelengths

across the DLP4500NIR DMD in a horizontal fashion, with 1350 nm projected to one side of the DMD,

2450 nm to the other end, and all wavelengths dispersed between. When specific DMD columns are

selected as 'on', or tilted to the +12º position, the energy reflected by the selected columns diverts through

the collection optics to the single pixel detector. All other DMD columns which are not selected as 'on' are

by default 'off' (tilted to the –12º position). 'Off' DMD pixels divert the unselected wavelengths away from

the detector optical path so as not to interfere with the selected wavelength measurement.

The DLP NIRscan EVM size is mostly driven by the size of the optical engine and measures

approximately 197-mm long, 112-mm wide, and 96-mm tall.

Figure 1-2. DLP NIRscan EVM Optical Engine

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