National Semiconductor LM32 Manual de usuario

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Revision B

November 9, 2004

LM32, LM40, LM41 Evaluation Board User’s Guide

LM32

LM40

LM41 Evaluation Board User’s Guide

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LM32, LM40, LM41 Evaluation Board User’s Guide

Table of Contents

Table of Contents 2

References 3

1.0Introduction 4

1.1BlockDiagram 4

2.0QuickStart 5

2.1QuickStartDiagram 5

2.2 LM32 Quick Start 6

2.3 LM40 Quick Start 8

2.4 LM41 Quick Start 10

3.0 Functional Description 12

3.1 Evaluation Board Connection Tables 12

3.1.1 LM32 Evaluation Board Connection Table 12

3.1.2 LM40 Evaluation Board Connections Table 13

3.1.3 LM41 Evaluation Board Connections Table 14

4.0 Software Installation and Operation 15

5.0 Electrical and Mechanical Specifications 16

5.1 Electrical Specifications 16

5.2 Electrical Schematic 16,17

5.3 Evaluation Board Layout 18

5.4 Bill of Materials 19

5.5 Mechanical Specifications 20

5.5.1 Operating Mechanical and Environmental Specifications 20

5.5.2 Evaluation Board Mechanical Dimensions 20

5.5.3 Electrostatic Discharge (ESD) Precautions 20

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LM32, LM40, LM41 Evaluation Board User’s Guide

References

1. Datasheet for the device on the evaluation board:

a. “LM32 Dual Thermal Diode Temperature Sensor With SensorPath™Bus” or

b. “LM40 Hardware Monitor with Dual Thermal Diodes and SensorPath™Bus” or

c. “LM41 Hardware Monitor with Thermal Diode Inputs and SensorPath™Bus”

The latest copy of the LM32, LM40, LM41 datasheets can be obtained by going to the National

Semiconductor website www.national.com, by searching on “LM32”, “LM40”, or “LM41”, and then

downloading the appropriate datasheet file.

2. SensorEval, Version 1.04b or later, Evaluation Board CD containing:

a. The SensorEval.exe executable program used to run the LM32, LM40, or LM41

Evaluation Boards.

b. A softcopy of this User’s Guide

c. A readme.txt file with useful information about the program.

d. A softcopy of the SensorEval Software manual.

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1.0 Introduction

The LM32/LM40/LM41 Evaluation Board is

used together with the National Semiconductor

SensorEval software (provided in the kit), and

with a USB cable (not provided in the kit), and

with an external personal computer (PC).

Power to the LM32/LM40/LM41 Evaluation

Board is provide by the +5VDC line of the USB

connection. No external power supply or signal

sources are required for operation of the

LM32/LM40/LM41 evaluation board.

Before connecting the PC to the

LM32/LM40/LM41 evaluation board through the

USB cable, the PC is first turned on and allowed

to go through its boot-up procedure. The user

installs and initiates the SensorEval software.

See Section 4.0 for software installation details.

After the SensorEval software is running, the

user can connect the USB cable first to the

computer and then to the LM32/LM40/LM41

Evaluation Board.

The PC should be able to recognize the board

and the user simply runs the SensorEval

software and selects the LM32/LM40/LM41 Eval

Board radio button. The software allows the

user to select which of the LM32, LM40, or

LM41 devices is used.

The block diagram below describes the

LM32/LM40/LM41 Evaluation Board itself. The

USB input provides the +5.0 VDC power to the

board, which is regulated down to 3.3 VDC to

power the IC’s. The EEPROM is programmed

at the factory with a unique ID code for this

particular board. When the USB cable is

plugged in, the PC interrogates the USB

devices and can identify this device as the

LM32/LM40/LM41 Evaluation Board.

The microcontroller on the board provides the

single wire signal (SWD), provides the address

(ADD) select signal, and relays the information

from the LM32, LM40, or LM41 to the PC via

the USB lines.

The pins available to the user for probing vary

according to device type. The output pinouts for

each of the LM32, LM40, or LM41 are shown in

the Connections sections and the Electrical

Schematic.

1.1Block Diagram

USB

Input EEPROM

Circuit

Voltage

Regulator

Circuit

Microcontroller

Circuitry

USB D+

USB D-

SCL

SDA

LM32, LM40,

or LM41

+5.0 VDC

GND

+3.3 VDC

+3.3V

SWD

ADD

GND

SWD

ADD

D1+

D1-

D2+

D2- Other Signals

depending on device.

(See Connections and

Schematic)

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2.0 Quick Start

1. Install the CD into the CD drive of the computer and install the SensorEval software (see Section

4.0).

2. Hookup the USB cable between the PC or notebook computer and the LM32/LM40/LM41 Evaluation

Board as shown in Quick Start Diagram below.

2.1 Quick Start Diagram

Important! NO EXTERNAL POWER SUPPLY OR SIGNAL INPUTS ARE REQUIRED!

For

Socket

(not used)

LM32/40/41 Evaluation Board

National Semiconductor

LM41

LM40

LM32

LM40

LM41

See

Connection

Diagrams

See

Connection

Diagrams

LM32/40/41

PC with

SensorEval

software

installed

USB Cable

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2.2 LM32 Quick Start

1. Run the SensorEval software by clicking the

icon on the desktop.

2. The first screen will look like this:

Select the LM32 Evaluation Board.

Click OK.

3. The next screen will look like this:

Select “Read Cont” box to read the temperature

continuously. Notice that there are three tabs for

the registers “00 through 05”, “08 through 09”,

and “09 through 20”. The first screen (above)

displays the registers 00hex through 05hex.

For Register 05, “Device Func1 Enable”,

select ENABLED.

4. Click on the 09-20 Register Tab.

The Screen should look like this:

For Register 0A select Enable for Temp Sensor

0, 1 and 2.Note that Temp2 (Remote sensor

[Q1 on the board] 2 is displayed in the box on

the right and is updated as the temperature of

the Q1 changes.

5. Click on the 08-09 Register Tab.

The screen should look like this:

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Notice the Local (on chip) sensor (Temp 0)

and Remote 1 (Q2) sensor readings.

6. If the user clicks on the Start Plot button a

graph box will appear and will graph the

temperature. An example is shown below.

7. If the user clicks on the Start Log button a

screen will appear that looks like this:

The user may then select whatever directory

and file name of their choice and click on

“Open”. Data will be stored in the file for each

date/time and temperature.

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2.3 LM40 Quick Start

1. Run the SensorEval software by clicking the

icon on the desktop.

2. The first screen will look like this:

Select the LM40 Evaluation Board.

Click OK.

3. The next screen will look like this:

Select “Read Cont” box to read the temperature

continuously.

Notice that there are four tabs for the registers

“00 through 04”, “05 through 09”, and “09

through 10”, “11”, and “12-20”. The first screen

(above) displays the registers 00hex through

04hex.

4. Click on the 05-09 Register Tab.

The Screen should look like this:

For Register 05 select Enable for “Device

Func2 Enable” and “Device Func1 Enable”.

5. Click on the 09-10 Register Tab.

The screen should look like this:

Select Enabled for Register 0A Temp Sensor

(0,1,2) Enable. The temperature readings for

Temp0 (Local) Temp 1 (Q2) and Temp2 (Q1)

will be displayed in Register 09 screens.

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6. For Voltage Monitoring input functions

select the “12-20” Register Tab. The

screen should look like this:

In Register 12, Enable Voltage Sensor (0-

4).

7. Click on the Register 11 tab. The

screen should look like this:

The voltages that are present at the voltage

inputs of the LM40 will be displayed in

8. If the user clicks on the Start Plot button

a graph box will appear and will graph

the temperature. A temperature

example is shown below.

A Voltage Input Monitoring plot is shown below.

9. If the user clicks on the Start Log button

a screen will appear that looks like this:

The user may then select whatever directory

and file name of their choice and click on

“Open”. Data will be stored in the file for each

date/time and temperature.

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