Texas Instruments LMP90100 Bedienungsanleitung

User’s Guide

August 2012

LMP90100 EVB User’s Guide

August 2012 LMP90100EVB User’s Guide 1

User’s Guide for the LMP90100 Evaluation Board with Sensor

AFE Software

Table of Contents

1.0. INTRODUCTION ........................................................................................................2

2.0. EQUIPMENT...............................................................................................................2

2.1. CONNECTION DIAGRAM..........................................................................................2

2.2. BOARD ASSEMBLY....................................................................................................4

3.0. EXAMPLE #1: QUICK START – DC READING ........................................................5

4.0. EXAMPLE #2: SHORTED INPUT AND CALIBRATION TEST...............................10

5.0. EXAMPLE #3 - 3-WIRE RTD APPLICATION..........................................................15

6.0. EXAMPLE #4: THERMOCOUPLE AND LM94022 APPLICATION........................21

7.0. POWERING THE LMP90100EB...............................................................................31

8.0. EVALUATING THE LMP90100 WITHOUT THE SPIO-4 BOARD. ........................31

9.0. INSTALLING THE LMP90100 SENSOR AFE SOFTWARE.....................................32

10.0. SCHEMATIC...........................................................................................................36

11.0. LAYOUT..................................................................................................................37

12.0. BOM.........................................................................................................................39

2 LMP90100 EVB User’s Guide August 2012

1.0. Introduction

The LMP90100 Design Kit (consisting of the LMP90100 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 National Semiconductor’s LMP90100 24-bit Fully Programmable Low Power Σ∆ ADC with

True Continuous Background Calibration.

Data capturing and static 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 LMP90100. The user will also have

the option to evaluate the LMP90100 without using the SPIO-4 board or the Sensor AFE software.

The LMP90100 will digitize the analog input, 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 calibrate the

device or the system’s gain, offset, and scale settings, and most importantly, to configure and learn about

the LMP90100.

This document describes the connection between the boards and PC, provides a quick start for a DC,

shorted input, 3-wire RTD, and thermocouple/temperature sensor applications. This document also

describes how to evaluate the LMP90100 with and without the SPIO-4 board and provides the schematic,

board layouts, and BOM.

2.0. Equipment

1. LMP90100 evaluation board (NSID: LMP90100EB)

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

3. PC with Sensor AFE software

4. Power supplies (optional) to source VA, VIO, VREFP, or VIN.

5. Multimeter (optional)

6. 3-wire RTD (optional)

7. Thermocouple (optional)

2.1. Connection Diagram

Figure 1 shows the connection between the LMP90100 Evaluation Board (LMP90100EB), SPIO-4

board, and a personal computer with the LMP90100 Sensor AFE software. LMP90100 can be

powered using external power supplies or from the SPIO-4 board.

March 2009 SNAU028A 3

Figure 1 – Connection Diagram

4 LMP90100 EVB User’s Guide August 2012

2.2. BoardAssembly

The schematic of the evaluation board can be seen in section 10.

Figure 2 – LMP90100 Evaluation Board Assembly

March 2009 SNAU028A 5

3.0. Example #1: Quick Start – DC Reading

The following procedures show a quick method to assemble the LMP90100EB and perform a quick DC

voltage reading.

A. LMP90100 EB Jumper Connections

1. The jumpers for this example application can be seen in Figure 3 and Table 1. Jumpers not

shown can be left unpopulated.

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

3. The schematic for the LMP90100EB can be seen section 10.

Figure 3 – Jumper Settings (Default) for the DC Test

Jumpers

Purpose

JP1: VA_EXT

P1-P2

Source VA externally

6 LMP90100 EVB User’s Guide August 2012

JP2: VIO_EXT

P1-P2

Source VIO externally

JP6

P1-P2

Connect VA supply to the LMP90100

JP7

P1-P2

Connect VIO supply to the LMP90100

JP10: VIN_JMP

P5-P6

Connect a DC input to VIN2

JP10: VIN_JMP

P7-P8

Connect a DC input to VIN3

JP13: VREF_JMP1

P3-P4

VREFP1 = 4.1V from U4 (LM4140)

JP13: VREF_JMP1

P9-P10

VREFN1 = ground

JP14: VREF_JMP2

P1-P2

Connect VREFP1 source to the LMP90100

JP14: VREF_JMP2

P3-P4

Connect VREFN1 source to the LMP90100

Table 1 - Jumpers for DC Measurement

B. Installing/Opening the Software - follow section 9.0 to install and open the LMP90100 Sensor

AFE software.

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

1. Connect a 5.0V power supply to J1 (VA_EXT) and GND (J2). Don’t turn on the power

supply yet.

2. Connect a 5.0V power supply to J3 (VIO_EXT) and GND (J2). Don’t turn on the power

supply yet.

3. Turn on the power supply that is sourcing VA (J1), and then turn on the power supply that is

sourcing VIO (J3).

4. Connect the LMP90100EB’s JP12 to SPIO-4 Board’s J6 (pins 1-16). See Figure 4.

Figure 4 – LMP90100EB-to-SPIO-4 Board Connection

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

6. Use a multimeter to measure LMP90100EB’s JP6, JP7; they should all be approximately 5V.

If they are not, check your power supplies and jumpers. Measure JP14.P2; it should be

approximately 4.1V. If it’s not, check your jumpers and U4.

D. Configuring the LMP90100 Using the Sensor AFE Software

March 2009 SNAU028A 7

Follow the step-by-step instructions under the “HelpBar” mini-tab (left hand side of the GUI) to

configure the LMP90100 for this example. These step-by-step instructions are discussed in

details below, and the recommended configuration should look similar to the figure below.

Figure 5 - Recommended LMP90100 Configuration for a DC Reading

1. Step 1: Select a Sensor - select “DC” “DC” since the input source is not a sensor.

2. Step 2: Configure Inputs – click on the “INPUT MUX” block to set “VINP = 000: VIN2”

and “VINN = 001: VIN3”. Since VIN0 = (3/4) VREF1 and VIN1 = (1/4) VREF1, the

measurement across this channel will be (1/2) VREF1.

3. Step 3: Source IB1/IB2? – this step can be ignored because neither IB1 nor IB2 is connected

to the inputs.

4. Step 4: Select Reference – click on the “VREF MUX” block to choose “VREF_SEL = 0:

VREF1”. Make sure the VREF1 value on the upper left hand side of the GUI is 4.1V

(default).

5. Step 5: Set Gain – since VIN = (1/2) VREF1, the maximum gain that can be set is 2 (with

buffer disabled). If the buffer is enabled, then the output might rail and enable the

“OFLO_FLAGS” flag. In this case, set the gain to 1. Click on the “FGA” block, “PGA”

block, or the “Gain” slider to select the gain.

8 LMP90100 EVB User’s Guide August 2012

6. Step 6: Set Buffer – click on the “BUFF” block to include or exclude the buffer from the

signal path.

7. Step 7: Set Calibration - click on the “No Calibration” block to enable or disable calibration.

Refer to the LMP90100 datasheet to more information on the LMP90100’s background

calibration types and modes.

8. Step 8: Int/Ext CLK? – click on the “CLK MUX” block and make sure the internal clock is

selected.

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

Device Performance base on the block diagram that you’ve configured, as well as the

Measured System Performance if you’ve connected a board and ran the LMP90100.

E. Capturing Data

1. Click on the “Measurement” tab and set the “Scan Mode” as follows:

Figure 6 - Scan Mode Settings

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

3. Under the “Stop Condition” field, select Run as “1000” samples.

4. Click on the “Run” button to view the output voltage results. A reading of approximately

½(VREF1) should be plotted as seen in Figure 7.

March 2009 SNAU028A 9

Figure 7 - Results for Example #1 - DC Reading

10 LMP90100 EVB User’s Guide August 2012

4.0. Example #2: Shorted Input and Calibration Test

This example demonstrates LMP90100’s ability to calibrate for offset error.

A. LMP90100 EB Jumper Connections

1. Connect the LMP90100EB jumpers like the jumpers shown in the figure and table below.

Jumpers not mentioned can be left unconnected.

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

3. The schematic for the LMP90100EB can be seen in section 10.

Figure 8 – LMP90100EB Jumper Settings for the Shorted input and Calibration Test

Jumpers

Purpose

JP1: VA_EXT

P2-P3

Source VA with the 5.0V from the SPIO-4 board.

JP2: VIO_EXT

P2-P3

Source VIO with the 5.0V from the SPIO-4 board.

JP4

P2-P3

Get 5.0V from the SPIO-4 board

JP6

P1-P2

Connect VA supply to the LMP90100

JP7

P1-P2

Connect VIO supply to the LMP90100

JP9

P1-P2

Force the odd pins of JP10 to be midscale (VREF1/2)

JP10: VIN_JMP

P5-P6

Connect a DC (midscale) voltage to VIN2

JP13: VREF_JMP1

P3-P4

VREFP1 = 4.1V from U4 (LM4140)

JP13: VREF_JMP1

P9-P10

VREFN1 = ground

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