Texas Instruments LM75AEB Manuale utente

User’s Guide

July 2012

LM75AEB User’s Guide

July2012 LM75AEB User’s Guide 1

CONTENTS

INTRODUCTION....................................................................................................... 1

SETUP....................................................................................................................... 1

BOARD LAYOUT ..................................................................................................... 8

SCHEMATIC........................................................................................................... 10

LIST OF FIGURES

1 I2C 7-bit Slave Address............................................................................................. 2

2 Three Least Significant Bits.......................................................................................2

3 LM75AEB Board Block Diagram................................................................................ 2

4 Top Assembly Layer.................................................................................................. 4

5 Top Layer Routing ..................................................................................................... 5

6 Bottom Layer Routing................................................................................................ 5

7 LM75AEB Schematic................................................................................................. 6

LIST OF TABLES

1 Device and Package Configurations.......................................................................... 1

2 I2C Address User Setting .......................................................................................... 2

3 LM75AEB Bill of Materials ....................................................................................... 11

1. Introduction

The Texas Instruments LM75AEB evaluation board (EB) helps designers evaluate the operation and

performance of the LM75A, an industry-standard digital temperature sensor with an integrated Sigma-Delta

analog-to-digital converter and I

C interface. The LM75A provides 9-bit digital temperature readings with an

accuracy of ±2°C from -25°C to 100°C and ±3°C over -55°C to 125°C.

The EVM contains one Digital Temperature Sensor (See Table 1).

Table 1: Device and Package Configurations

TEMP SENSOR IC PACKAGE

U6A1 LM75AIM SOP-8

2. Setup

This section describes the jumpers and connectors on the LM75AEB as well and how to properly connect, set

up and use the LM75AEB.

Setup

2 LM75AEB User’s Guide July 2012

2.1. Input/Output Connector Description

JP2 – Output is a header that allows user to probe the LM75AIM’s VDD, GND, A0, A1, A2, OS#, and I

pins.

JP4 – VDD is the power input terminal for the LM75AIM. The jumper terminal provides power to LM75AIM

VDD pin.

JP5 – A0 is bit 0 of the three least significant bits of the I2C slave address. At default, this jumper is pulling

high, and jumping the two terminals allows setting A0 low.

JP6 – A1 is bit 1 of the three least significant bits of the I2C slave address. At default, this jumper is pulling

high, and jumping the two terminals allows setting A1 low.

JP7 – A2 is bit 2 of the three least significant bits of the I2C slave address. At default, this jumper is pulling

high, and jumping the two terminals allows setting A2 low.

1001A2A1A0

MSBLSB

Figure 1: 7-bit Slave Address

JP5JP6JP7

A0A1A2

Figure 2: Three Significant Bits

A2A1A0

000

001

010

011

100

101

110

111

Table 1: I2C Address User Setting Input

Setup

3 LM75AEB User’s Guide SNIU007A July 2012

2.2. Setup

To ensure that you are using the latest version of SensorEval software, you can download from our website

at http://www.ti.com/tool/sensoreval. You must install the SensorEval software, before you connect

theLM75AEB to your PC.

To install the SensorEval Software:

•Click this link http://www.ti.com/tool/sensoreval then click on the red “download” button and click the

“Save” button to save the file to the known directory.

•To open the ZIP file you just download click on the “Open” button

Setup

4 LM75AEB User’s Guide July 2012

•Uncompress the file that you downloaded into a known directory, and run the

SensorEval_1.2.0_Setup.exe file

•When you see the Welcome screen as shown below, follow the instructions by clicking the “Next”

button on the screen to install the software

•When you finish the installation, please click “Finish” button

Setup

5 LM75AEB User’s Guide SNIU007A July 2012

•Before you launch the SensorEval software, connect LM75AEB device to one free USB port of your

PC. The “New Hardware” screen appears and click the “Next” button.

•A warning sign appears. Click “Continue Anyway” button

Setup

6 LM75AEB User’s Guide July 2012

2.3. Operation

For proper operation of the LM75AEB, JP4 should be jumpered. This will allow the LM75A’s VDD to be

sourced from an on-board 3.3V regulator. Jumping JP5 and JP6 will allow configuring the I2C slave address

to 4Ch.

For this quick start, connect the following jumpers:

1. JP4 to short

2. JP5 to short

3. JP6 to short

Figure 3: LM75AEB Board Block Diagram

USB

Input

EEPROM

Circuit

Voltage

Regulato

Circuit

Microcontrolle

Circuitry

USB D

0 VDC

GND

3 VDC

VDD

GND

SCL

SDA

OS#

U6A1

75AEB

JP6

JP5

0 JP7

GND

SDA

SCL

Setup

7 LM75AEB User’s Guide SNIU007A July 2012

•To run the SensorEval software, click the icon on the desktop. The dialog box appears to select the

definition file of LM75.

•A confirm screen appears. Click “OK” button.

Setup

8 LM75AEB User’s Guide July 2012

•The SensorEval software will populated based on the LM75’s definition file.

•Select the I2C Addr as “4c”

•Select the Read Cont as “All Regs”. This will read the values continuously.

•Changing the value of LM75A’s registers by clicking the white textbox on the Register Bits column

Board Layout

9 LM75AEB User’s Guide SNIU007A July 2012

3. Board Layout

Figure 4, Figure 5, and Figure 6 show the board layout for the LM75AEB. The EVM offers resistors,

capacitors, eeprom, microcontroller and jumpers to set three least significant bits of I2C slave address to run

the LM75AIM temperature sensor.

The LM75AEB have two additional package footprints MSOP-8 and LLP-8.

Figure 4: Top Assembly Layer

Board Layout

10 LM75AEB User’s Guide July 2012

Figure 5: Top Layer Routing

Figure 6: Bottom Layer Routing

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