Texas instruments LMP91050 User Manual

Table of Contents

LMP91050 Evaluation Board

User’s Guide for the LMP91050 Evaluation Board with Sensor AFE Software

1.0. Introduction ........................................................................................................................................ 1

2.0. Equipment .......................................................................................................................................... 2

2.1. Connection Diagram .......................................................................................................................... 2

2.2. Board Assembly ................................................................................................................................. 3

3.0. Quick Start ......................................................................................................................................... 4

4.0. Powering the LMP91050SDEVAL .................................................................................................... 11

5.0. Evaluating the LMP91050 without the SPIO-4 Board. ..................................................................... 11

6.0. Installing the LMP91050 Sensor AFE Software ................................................................................ 12

7.0. Schematic ........................................................................................................................................... 13

8.0. Layout ................................................................................................................................................ 14

9.0. BOM .................................................................................................................................................. 15

1.0. Introduction

The LMP91050 Design Kit (consisting of the LMP91050 Evaluation Board, the SPIO-4 Digital Controller Board, the Sensor AFE software, and this user’s guide) is designed to ease evaluation and design-in of Texas Instrument’s LMP91050 Configurable AFE for Nondispersive In frared (NDIR).

Data capturing and evaluations are simplified by connecting the SPIO-4 Digital Controller Board (SPIO-4 board) to a PC via USB and running the Sensor AFE software. The data capture board will generate the SPI signals to communicate to and capture data from the LMP91050. The user will also have the option to evaluate the LMP91050 without using the SPIO-4 board or the Sensor AFE software.

The on board data converter will digitize the LMP91050’s analog output, and the software will display these results in time domain and histogram. The software also allows customers to write to and read from registers, to configure the device’s gain, output offset, and common mode voltage, and most importantly, to configure and learn about the LMP91050.

This document describes the connection between the boards and PC, and provides a quick start for voltage measurements. This document also describes how to evaluate the LMP91050 with and without the SPIO-4 board and provides the schematic, board layout, and BOM.

2.0. Equipment

1. LMP91050 evaluation board (NSID: LMP91050SDEVAL)

2. SPIO-4 digital controller board (NSID: SPIO-4)

3. Power supplies (optional) to source VDD-EXT or IN_DUT.

4. Multimeter

5. PC with Sensor AFE software

6. NDIR Thermopile Sensor (optional)

2.1. Connection Diagram

Figure 1 shows the connection between the LMP91050 Evaluation Board (LMP91050SDEVAL), SPIO-4 board, and a personal computer with the LMP91050 Sensor AFE software. LMP91050 can be powered using external power supplies or from the SPIO-4 board.

LMP91050 Evaluation Board

Figure 1 – Connection Diagram

2.2. Board Assembly

LMP91050 Evaluation Board

Figure 2 – LMP91050 Evaluation Board Assembly

LMP91050 Evaluation Board

3.0. Quick Start

The following procedures show a quick method to assemble the LMP91050SDEVAL and perform a quick voltage reading.

A. LMP91050 EVB Jumper Connections

1. The jumpers for this example application can be seen in Figure 3 and Table 1

2. The SPIO-4 board is properly setup out of the box (no assembly required).

3. The schematic for the LMP91050SDEVAL can be seen in Figure 10.

Figure 3 – Jumper Settings (Default) for voltage reading

Jumpers

Purpose

JP1: VDD_DUT

P1-P2

Connect LMP91050 VDD to +3.3V from SPIO4

JP2: VREF_ADC

P1-P2

Connect ADC VREF to 4.1V from U5 (LM4140)

JP3: VA_ADC

P1-P2

Connect ADC VA to +5V from SPIO4

JP4: OUT_DUT to ADC

P1-P2

Connect LMP91050 OUT to ADC input RC filter

J2: IN to CMOUT

Open

Connect LMP91050 IN to CMOUT. Note: Bo ard is

short IN to CMOUT for easy evaluation.

provided with this jumper open. Use provided jumper to

Table 1 - Jumpers for Voltage Measurement

B. Installing/Opening the Software - follow section 6.0 to install and open the LMP91050 Sensor

AFE software.

C. Connecting and Powering the Boards – these steps have to be done in this order.

1. Connect the LMP91050SDEVAL’s J1 to SPIO-4 Board’s J6. See Figure 4.

LMP91050 Evaluation Board

Figure 4 – LMP91050SDEVAL-to-SPIO-4 Board Connection

2. Connect SPIO-4 board to a PC via USB.

3. Use a multimeter to measure LMP91050SDEVAL’s +5V test point; it should be

approximately 5V. If it is not, check your power supplies and jumpers. Measure test point VREF_ADC; it should be approximately 4.1V. If it’s not, check your jumpers and U5.

1 2 3 4 5

LMP91050 Evaluation Board

D. Sensor AFE Software Overview

Once connection between the boards and PC is established, you can use the software to com m unicate to and capture data from the LMP91050. Drag cursor over window icons to get an icon description. Some items of interest are shown in Figure 5.

Figure 5 – Sensor AFE Items of Interest

1. Menu Bar Icons (from left to right) a. Save Configuration to File: Saves the current configuration settings (register

settings) to an .xml file.

b. Load Configuration File: Loads the selected configuration settings (register

settings) .xml file.

c. Register Map: Opens Register Map window. An alternative to the Virtual

Device, for writing and reading the device registers. See datasheet for details on device Register Map.

d. Save All Registers to File: Saves register contents to a .cvs file. e. Read All Register from Board: After configuring the register map, use this button

to read all registers. Functional only in SDIO Mode (see Item 3).

f. Write All Registers To Board: After configuring the register map use this button

to write all registers. Registers will not be updated until this step is done.

g. Zoo m In/Out Diagram Ima g e: Zoom in and out of the virtual device image. h. Show Tutorial: Takes you to the interactive Software Overview videos. i. Documentation: Accesses the LMP91050 Datasheet, SPIO4 User’s Guide, or

Evaluation Board User’s Guide.

2. User Inputs

a. fc: Center frequency of external bandpass filter. b. bandwidth: Pass band bandwidth of external bandpass filter. c. R1_EXT, R2_EXT, C1_EXT, C2_EXT: External bandpass filter component

values calculated based on user input for center frequency (fc) and pass band (bandwidth) described above.

d. Supply: LMP91050 supply voltage (VDD). e. IC Temp: LMP91050 operating temperature f. Offset Adjust Voltage: The tool will calculate the DAC code (decimal) required

to achieve this output offset adjust voltage. User must then Write to the register to update the value in the NDAC register.

g. ADC Vref: ADC reference voltage. User should inpu t v alue m easured at

VREF_ADC test point. Value used to calculate displayed Output Voltage.

h. Vout Dark: This value corresponds to the user measured value at the LMP91050

output (OUT) when input is shorted (IN = CMOUT). Tool will use this value to estimate LMP91050 input voltage (IN - CMOUT) on subsequent measurements.

3. Change Mode: Change between device Read Mode OFF (default) and ON. See datasheet

for details on SPI Read Mode.

4. Eval Board Setting: Document to show user how to configure jumpers and connect

thermopile based on sensor selected.

5. Virtual Device: Drag cursor across color coded blocks and click to configure each block.

To update registers “Write A ll Regis ters ” when done.

E. Configuring the LMP91050 Using the Sensor AFE Software

Follow the step-by-step instructions under the “HelpBar” mini-tab (left hand side of the GUI) to configure the LMP91050 for this example. These step-by-step instructions are discussed in details below, and the recommended configuration should look similar to Figure 6.

LMP91050 Evaluation Board

Figure 6 - Recommended LMP91050 Conf ig uration for a voltage Reading

1. Step 1: Select a Sensor – Sensor Database window opens. See Figure 7. Step 1: Click sensor

type (Thermopile) and the sensors will show in the bottom table. Step 2: Click sensor and then click “Select” button on the left to use this sensor.

Step 1

Step 2

LMP91050 Evaluation Board

Figure 7 – Sensor Database Window

2. Step 2: PGA1 Enable – click on the “PGA1” block to set “1: PGA1 ON” . Remember after

configuring the register map to use the Write All Registers button to update the registers.

3. Step 3: PGA2 Enable – click on the “PGA2” block to set “1: PGA2 ON” . Note: By default

PGA1 and PGA2 are OFF on power up. However the software was designed to automatically power ON PGA1 and PGA2 for ease of use.

4. Step 4: External Filter – click on the switch block to choose “0: PGA1 to PGA2 direct”

(default).

5. Step 5: Common Mode – click on the “CM GEN” block to set “0: 1.15V” (default).

6. Step 6: GAIN 2 – click on the “PGA2” block to set “00: 4” (default).

7. Step 7: GAIN 1 – click on the “PGA1” block to set “0: 250” (default).

8. Step 8: DAC (Output Offset) – click on the “DAC” block to set “128” (default) for 0 mV

offset. Alternatively, user can also use the Offset Adjust Voltage user input field to input 0 mV.

9. Step 9: Performance - click on the “Performance” mini-tab. This tab displays the Estimated

Device Performance based on device configuration and user input device Supply and IC Temp .This tab also displays the Measured System Performance if you’ve connected a board and ran the LMP91050.

F. Capturing Data

1. Click on the “Measurement” tab.

2. Under the “Output Format” field, select Display as “Output Voltage (V)”

3. Under the “Stop Condition” field, select Run as “1” Seconds. Alternatively, select “Run

Continuously” radio button to run continuously up to 1 hour.

4. Click on the “Run” button to view the output voltage results. A reading should be plotted as

seen in Figure 8 . Output voltage will vary depending on input voltage across IN_DUT and CMOUT_DUT. If J2 is shorted, IN_DUT = CMOUT_DUT, output voltage should be about 1V. Note: Board is provided with jumper J2 open. Use provided jumper to short IN to CMOUT for easy evaluation.

LMP91050 Evaluation Board

Figure 8 - Results for DC Reading

LMP91050 Evaluation Board

4.0. Powering the LMP91050SDEVAL

There are two ways in which VDD can be sourced: external supply or SPIO-4 power.

If using an external power supply to source VDD, do the following:

1. Connect an external power supply to banan a jack s VDD-EXT and GND.

2. Jumper pins 2 and 3 of JP1 to connect the external power to VDD_DUT.

If using the SPIO-4 power to source VDD, then do the following:

1. Jumper pins 1 and 2 of JP1 to connect +3.3V SPIO-4 power to VDD_DUT.

The schematic for the LMP91050SDEVAL can be seen in Figure 10.

5.0. Evaluating the LMP91050 without the SPIO-4 Board.

The SPIO-4 digital controller board is used to generate the SPI signals to communicate to the LMP91050. Without the SPIO-4 board, the Sensor AFE software for the LMP91050 cannot be used to capture and analyze data from the LMP91050SDEVAL.

If the SPIO-4 board is not available but LMP91050 evaluation is desirable, then connect your own SPI signals to J1 of the LMP91050SDEVAL as seen below. Reference the LMP91050 datasheet for appropriate SPI timing diagrams. Source LMP91050 VDD with an external power supply per previous section.

Figure 9 - LMP91050SDEVAL’s J1 for SPI Signals

Refer to the LMP91050 datasheet for more information on the LMP91050’s SPI protocol.

LMP91050 Evaluation Board

6.0. Installing the LMP91050 Sensor AFE Software

Each Sensor AFE product will have its own software. To access the Sensor AFE software for LMP91050, follow the steps below.

1. Getting the Zip Files a. You can find the latest downloadable Sensor AFE software at

ti.com/sensorafe

b. Download the zip file onto your local hard drive. Unzip this folder.

2. Installing the Driver - skip this step if you don’t have the LMP91050SDEVAL and SPIO4 digital controller board. a. See the provided Installat ion Guide For SensorAFE Drivers.pdf.

3. Installing the Software a. See the provided Installation Guide for LMP91050 SensorAFE Software.pdf

i. Note: If you run the software without the boards, you’ll get an error message. Ignore

that error message and click “Ok” to continue.

Note 1) Thermopile sensor U4 is not included.

7.0. Schematic

LMP91050 Evaluation Board

Figure 10 - LMP91050SDEVAL Schematic

8.0. Layout

LMP91050 Evaluation Board

Figure 11 - Layout

Item

Designator

Description

Manufacturer

PartNumber

Quantity

1

+3P3V, +5V, A0_DUT, A1_DUT, CMOUT_DUT, CS B_ADC,

Test Point, TH, Compact, Red

Keystone

5005

23

2

AA1

Printed Circuit Board

N/A

PCB

1

4

C2

CAP CER 4700PF 250V X7R 10%

TDK

C2012X7R2E472K

1

5

C3, C9, C10, C12, C17

CAP, TANT, 10uF, 10V, +/-20%,

3.4 ohm, 3216-18 SMD

Vishay-

Sprague

293D106X0010A2TE3

5

6

C4, C7, C13, C15, C18, C19

CAP, CERM, 0.1uF, 16V, +/-5%,

X7R, 0603

AVX

0603YC104JAT2A

6

7

C5, C6

CAP, CERM, 10nF, 50V, +/-5%,

C0G/NP0, 0805

MuRata

GRM2195C1H103JA01D

2

8

C8, C14

CAP, CERM, 0.1uF, 25V, +/-10%,

X7R, 0805

AVX

08053C104KAT2A

2

9

C11

CAP, CERM, 0.1uF, 100V, +/-5%,

X7R, 1206

AVX

12061C104JAT2A

1

10

C16, C20

CAP, CERM, 1uF, 10V, +/-10%,

X7R, 0805

AVX

0805ZC105KAT2A

2

DNS (Connector, TH, BNC) Connex

Uninsulated, 15A

Components

13

GND1, GND2, GND3, GND4, GND5, GND6, GND7, GND8, GND9,

Test Point, TH, Compact, Black

Keystone

5006

10

14

N/A

BUMPON HEMISPHERE .44X.20

4

15

J1

SPIO-GPSI32 Header, 72-Pin, Dual

Sullins

PBC36DGAN

1

16

J2, JP3, JP4

Header, TH, 100mil, 2x1, Gold

Samtec Inc.

TSW-102-07-G-S

3

17

JP1, JP2

Header, TH, 100mil, 1x3, Gold

Samtec Inc.

TSW-103-07-G-S

2

18

L1, L2

Ferrite, Chip, 200mA, .80 ohm,

Wurth

BLM21BD272SN1L

2

9.0. BOM

LMP91050 Evaluation Board

CSB_DUT, DOUT_ADC, IN_DUT, MISO, MOSI, MOSI_EN,

OUT_DUT, REF_ADC, SCLK_ADC, SCLK_DUT , SDI_DUT,

TEMP, VA_ADC, VDD_DUT, VDD_EXT, VI O _ADC, VREF_ADC

3 C1 CAP CER 10UF 16V X7R 10%

1206 0805

11 OUT 12 GND, VDD-EXT Standard Banana Jack,

GND10

BLACK 3M SJ-5003 (BLACK)

Electronics

TDK C3216X7R1C106K 1

Amphenol

Johnson

Electronics

112404 1

108-0740-001 2

row, Right Angle

plated, 230 mil above insulator plated, 230 mil above insulator

SMD

Connector

Solutions

Elektronik

eiSos

20

R3

DNS (RES, 0 ohm, 5%, 0.125W,

0805)

Vishay-Dale

CRCW08050000Z0EA

0

21

R5, R10

RES, 0 ohm, 5%, 0.125W, 0805

Vishay-Dale

CRCW08050000Z0EA

2

22

R4

RES, 100k ohm, 5%, 0.125W, 0805

Vishay-Dale

CRCW0805100KJNEA

1

23

R6

RES, 100k ohm, 1%, 0.125W, 0805

Vishay-Dale

CRCW0805100KFKEA

1

24

R7

RES, 1.00k ohm, 1%, 0.125W,

Vishay-Dale

CRCW08051K00FKEA

1

25

R8

RES, 27.4 ohm, 1%, 0.1W, 0603

Vishay-Dale

CRCW060327R4FKEA

1

27

U1

DNS (Configurable AFE for NDIR)

Texas

Instruments

LMP91050

1

28

U2

14-Bit, 200 kSPS, Pseudo10-pin Mini SOIC, Pb-Free

Texas

ADC141S628QIMMX/NO

1

29

U3

Non-Inverting 3-State Buffer

On

Semiconductor

MC74VHC1G125DFT1

1

30

U4

DNS (Thermopile Sensor)

0

31

U6

2K 5.0V I2C Serial EEPROM

Microchip

24C02C/SN

1

32

Y1

Osc 10.000Mhz 5.0V Full Size

ECS Inc

ECS-100AX-100

1

SOIC

LMP91050 Evaluation Board

19 R1, R2 RES, 160k ohm, 5%, 0.125W, 0805 Vishay-Dale CRCW0805160KJNEA 2

0805

26 R9 RES, 51.1 ohm, 1%, 0.1W, 0603 Vishay-Dale CRCW060351R1FKEA 1

Differential Input, MicroPower ADC,

33 U5 Precision Micropower Low Dropout

Voltage Reference, 8-pin Narrow

34 Oscillator Socket Aries

Instruments

Electronics

Table 2 - BOM

Texas

PB

LM4140ACM-4.1/NOPB 1

1107741 1

LMP91050 Evaluation Board

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Texas instruments LMP91050 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1.0. Introduction

2.0. Equipment

2.1. Connection Diagram

2.2. Board Assembly

3.0. Quick Start

4.0. Powering the LMP91050SDEVAL

5.0. Evaluating the LMP91050 without the SPIO-4 Board.

7.0. Schematic

8.0. Layout

9.0. BOM