Texas Instruments LMP91051EVM User manual

User’s Guide
October 2012
LMP91051EVM User’s Guide
October 2012 LMP91051EVM User’s Guide
CONTENTS
1INTRODUCTION...................................................................................................1
2 SETUP..................................................................................................................2
3 OPERATION.........................................................................................................5
4 INSTALLING THE SENSOR AFE SOFTWARE...................................................10
5 BOARD LAYOUT................................................................................................11
6 SCHEMATIC.......................................................................................................12
7 BOM....................................................................................................................13
LIST OF FIGURES
1 Connection Diagram...............................................................................................2
2 Jumper Setting (Default) for voltage reading...........................................................3
3 LMP91051EVM to SPIO-4 Board Connection.........................................................4
4 Sensor AFE Items of Interest..................................................................................5
5 Recommended LMP91051 Configuration for a voltage Reading .............................7
6 Sensor Database Window .....................................................................................8
7 Reults of DC Reading.............................................................................................9
8 LMP91051EVM’s J3 for SPI Signals.....................................................................10
9 LMP91051EVM Layout.........................................................................................11
8 LMP91051EVM Schematic...................................................................................12
LIST OF TABLES
1 Jumpers for Voltage Measurement.........................................................................3
2 LMP91051EVM Bill of Materials............................................................................13
1. Introduction
The LMP91051 Design Kit (consisting of the LMP91051 Evaluation Module, 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 LMP91051 Configurable AFE for Nondispersive Infrared (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 LMP91051. The user will also have the option to evaluate the
LMP91051 without using the SPIO-4 board or the Sensor AFE software.
The on board data converter will digitize the LMP91051’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 LMP91051.

2 LMP91051EVM User’s Guide snou034
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 LMP91051 with and without the SPIO-4
board and provides the schematic, board layout, and BOM.
2. Setup
This section describes the jumpers and connectors on the EVM as well and how to properly connect, set up
and use the LMP91051EVM.
2.1. Connection Diagram
Figure 1 shows the connection between the LMP91051 Evaluation Module (LMP91051EVM), SPIO-4 board,
and a personal computer with the Sensor AFE software. LMP91051 can be powered using external power
supplies or from the SPIO-4 board.
Figure 1: Connection Diagram
2.2. Jumper Connections
1. The jumpers for this example application can be seen in Figure 2 and Table 1.
2. The SPIO-4 board is properly setup out of the box (no assembly required).
3. The schematic for the LMP91051EVM can be seen in Figure 10.

3 LMP91051EVM User’s Guide October 2012
Figure 2: Jumper Setting (Default) for voltage reading
Table 1: Jumpers for Voltage Measurement
Jumpers
Pin
Purpose
JP1: VDD_DUT P1-P2 Connect LMP91051 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 LMP91051 OUT to ADC input RC filter
JP5: VDD to VIO Open Connect LMP91051 VDD to VIO
JP6: VIO P2-P3 Connect LMP91051 VIO to +3.3V from SPIO4
J1: IN1 to CMOUT Open Connect LMP91051 IN1 to CMOUT. Note: Board is
provided with this jumper open. Use provided jumper to
short IN to CMOUT for easy evaluation.
J2: IN2 to CMOUT Open Connect LMP91051 IN2 to CMOUT. Note: Board is
provided with this jumper open. Use provided jumper to
short IN to CMOUT for easy evaluation.

4 LMP91051EVM User’s Guide snou034
2.3. Installing/Opening the Software
Follow Section 4 to install and open the Sensor AFE software.
2.4. Connecting and Powering the Boards
These Steps have to be done in this order.
1. Connect the LMP91051EVM’s J3 to SPIO-4 Board’s J6. See Figure 3.
.
Figure 3: LMP91051EVM to SPIO-4 Board Connection
2. Connect SPIO-4 board to a PC via USB.
3. Use a multimeter to measure LMP91051EVM’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.
J3

5 LMP91051EVM User’s Guide October 2012
3. Operation
3.1.Sensor AFE Software Overview
Once connection between the boards and PC is established, you can use the software to communicate to and
capture data from the LMP91051. Drag cursor over window icons to get an icon description. Some items of
interest are shown in Figure 4.
Figure 4: 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. Zoom In/Out Diagram Image: Zoom in and out of the virtual device image.
h. Show Tutorial: Takes you to the interactive Software Overview videos.
1
2
3
4
5

6 LMP91051EVM User’s Guide snou034
i. Documentation: Accesses the LMP91051 Datasheet, SPIO4 User’s Guide, or
Evaluation Board User’s Guide.
2. Device Selection and User Inputs
a. LMP91050/1 : Toggle between LMP91050 and LMP91051 device.
b. fc: Center frequency of external bandpass filter.
c. bandwidth: Pass band bandwidth of external bandpass filter.
d. 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.
e. Supply: LMP91051 supply voltage (VDD).
f. IC Temp: LMP91051 operating temperature
g. 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.
h. ADC Vref: ADC reference voltage. User should input value measured at VREF_ADC
test point. Value used to calculate displayed Output Voltage.
i. Vout Dark: This value corresponds to the user measured value at the LMP91051
output (OUT) when input is shorted (IN = CMOUT). Tool will use this value to estimate
LMP91051 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 All Registers” when done.
3.2.Configuring the LMP91051 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
LMP91051 for this example. These step-by-step instructions are discussed in details below, and the
recommended configuration should look similar to Figure 5.

7 LMP91051EVM User’s Guide October 2012
Figure 5: Recommended LMP91051 Configuration for a voltage Reading
1. Step 1: Select a Sensor – Sensor Database window opens. See Figure 6. 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.

8 LMP91051EVM User’s Guide snou034
Figure 6: Sensor Database Window
2. Step 2: Input Mux – click on the mux block to set “1: IN1” (default).
3. Step 3: 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.
4. Step 4: 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.
5. Step 5: External Filter – click on the switch block to choose “0: PGA1 to PGA2 direct” (default).
6. Step 6: Common Mode – click on the “CM GEN” block to set “0: 1.15V” (default).
7. Step 7: GAIN 2 – click on the “PGA2” block to set “00: 4” (default).
8. Step 8: GAIN 1 – click on the “PGA1” block to set “0: 250” (default).
9. 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.
10. Step 10: 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
LMP91051.
Step 1
Step 2

9 LMP91051EVM User’s Guide October 2012
3.3.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 . Output voltage will vary depending on input voltage across input (IN1/IN2) and CMOUT.
If J1/J2 are shorted, IN1/IN2 = CMOUT, output voltage should be about 1V. Note: Board is
provided with jumper J1/J2 open. Use provided jumper to short IN1/IN2 to CMOUT for easy
evaluation.
Figure 7: Results of DC Reading
3.4.Powering the LMP91051EVM
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 banana jacks 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 LMP91051EVM can be seen in Figure 10.

10 LMP91051EVM User’s Guide snou034
3.5.Evaluating the LMP91051 without the SPIO-4 Board
The SPIO-4 digital controller board is used to generate the SPI signals to communicate to the LMP91051.
Without the SPIO-4 board, the Sensor AFE software for the LMP91051 cannot be used to capture and
analyze data from the LMP91051EVM.
If the SPIO-4 board is not available but LMP91051 evaluation is desirable, then connect your own SPI
signals to J1 of the LMP91051EVM as seen below. Reference the LMP91051 datasheet for appropriate
SPI timing diagrams. Source LMP91051 VDD with an external power supply per previous section.
Figure 8: LMP91051EVM’s J3 for SPI Signals
Refer to the LMP91051 datasheet for more information on the LMP91051’s SPI protocol.
4. Installing the Sensor AFE Software
Each Sensor AFE product will have its own software. To access the Sensor AFE software for LMP91051,
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 LMP91051EVM and SPIO4 digital controller
board.
a. See the provided Installation Guide For SensorAFE Drivers.pdf.

11 LMP91051EVM User’s Guide October 2012
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.
5. Board Layout
Figure 9: LMP91051EVM Layout

6. Schematic
Figure 10: LMP91051EVM Schematic

7. BOM
LMP91051EVM Bill of Materials
Item Designator Description Manufacturer PartNumber Quantity
1 +3P3V, +5V, A0_DUT, A1_DUT, CMOUT_DUT, CSB_ADC,
CSB_DUT, DOUT_ADC, IN1_DUT, IN2_DUT, MISO, MOSI,
MOSI_EN, OUT_DUT, REF_ADC, SCLK_ADC, SCLK_DUT,
SDIO_DUT, TEMP, VA_ADC, VDD_DUT, VDD_EXT, VIO,
VIO_ADC, VIO_EXT, VREF_ADC
Test Point, TH, Compact, Red Keystone Electronics 5005 26
2 AA1 Printed Circuit Board TBD by TI 551xxxxxx-001 REV A 1
3 BNC1, BNC2, OUT DNS Amphenol Connex 112404 3
4 C1 CAP, CERM, 10uF, 6.3V, +/-
20%, X5R, 1206 TDK C3216X5R0J106M 1
5 C2 CAP CER 4700PF 250V X7R
10% 0805 TDK C2012X7R2E472K 1
6 C3, C9, C10, C12, C17, C22 CAP, TANT, 10uF, 10V, +/-
20%, 3.4 ohm, 3216-18 SMD Vishay-Sprague 293D106X0010A2TE3 6
7 C4, C7, C13, C15, C18, C19, C23 CAP, CERM, 0.1uF, 16V, +/-
5%, X7R, 0603 AVX 0603YC104JAT2A 7
8 C5, C6, C21 CAP, CERM, 10nF, 50V, +/-5%,
C0G/NP0, 0805 MuRata GRM2195C1H103JA01D 3
9 C8, C14 CAP, CERM, 0.1uF, 25V, +/-
10%, X7R, 0805 AVX 08053C104KAT2A 2
10 C11 CAP, CERM, 0.1uF, 100V, +/-
5%, X7R, 1206 AVX 12061C104JAT2A 1
11 C16, C20 CAP, CERM, 1uF, 10V, +/-10%,
X7R, 0805 AVX 0805ZC105KAT2A 2
12 FID1, FID2, FID3 Fiducial mark. There is nothing
to buy or mount. N/A N/A 3
13 GND1, GND2, GND3, GND4, GND5, GND6, GND7, GND8,
GND9, GND10, GND11 Test Point, TH, Compact, Black Keystone Electronics 5006 11
14 H1, H2, H3, H4 Bump Hemisphere B&F Fastener Supply NY PMS 440 0025 PH 4
15 J1, J2, JP3, JP4, JP5 Header, TH, 100mil, 2x1, Gold
plated, 230 mil above insulator Samtec Inc. TSW-102-07-G-S 5
16 J3 SPIO-GPSI16 Header, 16-Pin,
Dual row, Right Angle Sullins Connector Solutions PBC36DGAN 1
17 JP1, JP2, JP6 Header, TH, 100mil, 1x3, Gold
plated, 230 mil above insulator Samtec Inc. TSW-103-07-G-S 3
18 L1, L2 Ferrite, Chip, 200mA, .080 ohm,
SMD Wurth Elektronik eiSos BLM21BD272SN1L 2
19 R1, R2 RES, 160k ohm, 5%, 0.125W,
0805 Vishay-Dale CRCW0805160KJNEA 2
20 R3 DNS Vishay-Dale DNS 1
21 R4 RES, 100k ohm, 5%, 0.125W,
0805 Vishay-Dale CRCW0805100KJNEA 1
22 R5, R10 RES, 0 ohm, 5%, 0.125W, 0805 Vishay-Dale CRCW08050000Z0EA 2

23 R6 RES, 100k ohm, 1%, 0.125W,
0805 Vishay-Dale CRCW0805100KFKEA 1
24 R7 RES, 1.00k ohm, 1%, 0.125W,
0805 Vishay-Dale CRCW08051K00FKEA 1
25 R8 RES, 27.4 ohm, 1%, 0.1W,
0603 Vishay-Dale CRCW060327R4FKEA 1
26 R9 RES, 51.1 ohm, 1%, 0.1W,
0603 Vishay-Dale CRCW060351R1FKEA 1
27 R11, R12, R13, R14 DNS Vishay-Dale CRCW06031R00JNEA 4
28 U1 LMP91051 Texas Instruments LMP91051 1
29 U2 16-Bit, 50 to 250 kSPS,
Differential Input, MicroPower
ADC, 10-pin Mini SOIC, Pb-
Free
Texas Instruments ADC141S628QIMMX/NOP
B 1
30 U3 Non-Inverting 3-State Buffer Texas Instruments SN74AHC1G125DCKR 1
31 U4 DNS Heimann HMS J21 1
32 U5 Precision Micropower Low
Dropout Voltage Reference, 8-
pin Narrow SOIC
Texas Instruments LM4140ACM-4.1 1
33 U6 2K 5.0V I2C Serial EEPROM On Semiconductor CAT24C02WI-GT3 1
34 Y1 Osc 4.000Mhz 5.0V Full Size ECS Inc ECS-100AX-100 1
35 Y1A Oscllator Socket Aires Electronics A462-ND 1

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WARNINGS, RESTRICTIONS AND DISCLAIMERS
For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this
EVM is not a finished electrical equipment and not intended for consumer use. It is intended solely for use for
preliminary feasibility evaluation in laboratory/development environments by technically qualified electronics experts
who are familiar with the dangers and application risks associated with handling electrical mechanical components,
systems and subsystems. It should not be used as all or part of a finished end product.
Your Sole Responsibility and Risk. You acknowledge, represent and agree that:
1. You have unique knowledge concerning Federal, State and local regulatory requirements (including but not
limited to Food and Drug Administration regulations, if applicable) which relate to your products and which
relate to your use (and/or that of your employees, affiliates, contractors or designees) of the EVM for
evaluation, testing and other purposes.
2. You have full and exclusive responsibility to assure the safety and compliance of your products with all
such laws and other applicable regulatory requirements, and also to assure the safety of any activities to be
conducted by you and/or your employees, affiliates, contractors or designees, using the EVM. Further, you
are responsible to assure that any interfaces (electronic and/or mechanical) between the EVM and any
human body are designed with suitable isolation and means to safely limit accessible leakage currents to
minimize the risk of electrical shock hazard.
3. You will employ reasonable safeguards to ensure that your use of the EVM will not result in any property
damage, injury or death, even if the EVM should fail to perform as described or expected.
4. You will take care of proper disposal and recycling of the EVM’s electronic components and packing
materials.
Certain Instructions. It is important to operate this EVM within TI’s recommended specifications and
environmental considerations per the user guidelines. Exceeding the specified EVM ratings (including but not
limited to input and output voltage, current, power, and environmental ranges) may cause property damage,
personal injury or death. If there are questions concerning these ratings please contact a TI field representative
prior to connecting interface electronics including input power and intended loads. Any loads applied outside of the
specified output range may result in unintended and/or inaccurate operation and/or possible permanent damage to
the EVM and/or interface electronics. Please consult the EVM User's Guide prior to connecting any load to the EVM
output. If there is uncertainty as to the load specification, please contact a TI field representative. During normal
operation, some circuit components may have case temperatures greater than 60°C as long as the input and output
are maintained at a normal ambient operating temperature. These components include but are not limited to linear
regulators, switching transistors, pass transistors, and current sense resistors which can be identified using the
EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during
normal operation, please be aware that these devices may be very warm to the touch. As with all electronic
evaluation tools, only qualified personnel knowledgeable in electronic measurement and diagnostics normally found
in development environments should use these EVMs.
Agreement to Defend, Indemnify and Hold Harmless. You agree to defend, indemnify and hold TI, its licensors
and their representatives harmless from and against any and all claims, damages, losses, expenses, costs and
liabilities (collectively, "Claims") arising out of or in connection with any use of the EVM that is not in accordance
with the terms of the agreement. This obligation shall apply whether Claims arise under law of tort or contract or
any other legal theory, and even if the EVM fails to perform as described or expected.
Safety-Critical or Life-Critical Applications. If you intend to evaluate the components for possible use in safety
critical applications (such as life support) where a failure of the TI product would reasonably be expected to cause
severe personal injury or death, such as devices which are classified as FDA Class III or similar classification, then
you must specifically notify TI of such intent and enter into a separate Assurance and Indemnity Agreement.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2012, Texas Instruments Incorporated

IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other
changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest
issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and
complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale
supplied at the time of order acknowledgment.
TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms
and conditions of sale of semiconductor products. Testing and other quality control techniques are used to the extent TI deems necessary
to support this warranty. Except where mandated by applicable law, testing of all parameters of each component is not necessarily
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TI assumes no liability for applications assistance or the design of Buyers’ products. Buyers are responsible for their products and
applications using TI components. To minimize the risks associated with Buyers’ products and applications, Buyers should provide
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TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or
other intellectual property right relating to any combination, machine, or process in which TI components or services are used. Information
published by TI regarding third-party products or services does not constitute a license to use such products or services or a warranty or
endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the
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Reproduction of significant portions of TI information in TI data books or data sheets is permissible only if reproduction is without alteration
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TI is not responsible or liable for any such statements.
Buyer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory and safety-related requirements
concerning its products, and any use of TI components in its applications, notwithstanding any applications-related information or support
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anticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might cause
harm and take appropriate remedial actions. Buyer will fully indemnify TI and its representatives against any damages arising out of the use
of any TI components in safety-critical applications.
In some cases, TI components may be promoted specifically to facilitate safety-related applications. With such components, TI’s goal is to
help enable customers to design and create their own end-product solutions that meet applicable functional safety standards and
requirements. Nonetheless, such components are subject to these terms.
No TI components are authorized for use in FDA Class III (or similar life-critical medical equipment) unless authorized officers of the parties
have executed a special agreement specifically governing such use.
Only those TI components which TI has specifically designated as military grade or “enhanced plastic” are designed and intended for use in
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regulatory requirements in connection with such use.
TI has specifically designated certain components which meet ISO/TS16949 requirements, mainly for automotive use. Components which
have not been so designated are neither designed nor intended for automotive use; and TI will not be responsible for any failure of such
components to meet such requirements.
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DSP dsp.ti.com Energy and Lighting www.ti.com/energy
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Interface interface.ti.com Medical www.ti.com/medical
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Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video
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Wireless Connectivity www.ti.com/wirelessconnectivity
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2012, Texas Instruments Incorporated

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