Texas Instruments National Semiconductor LM87 Manual de usuario

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- 1 -

November 2000

Evaluation Board Instruction Manual

LM87

Serial Interface System Hardware Monitor with Remote

Diode Temperature Sensing

- 2 -

General Description

The LM87 Design Kit allows quick connection and evaluation of the LM87 System Hardware Monitor

integrated circuit. The Evaluation Board connects to and derives its power from the parallel printer port of a

PC. The software was written using Visual Basic 5.0 and is compatible with PC type computers running

Microsoft Windows 95 or Windows 98 operating system. Minimum 800 by 600 graphics resolution is

recommended for best viewing.

With the LM87 evaluation board and software you can:

•Configure the LM87 registers

•View the LM87 register contents

•Quickly gain familiarity with the LM87 features and operation

1.0 Setup

1.1 Installation

The LM87 Design Kit consists of the LM87 Evaluation Board, software on three 3.5” diskettes, and this

instruction manual.

•Insert Disk 1 into the 3.5” floppy drive of the PC. Install the software by clicking on the “Start” button,

selecting “Run” and typing in the name of the drive followed by “\setup”. For example type a:\setup.

Then click on “OK” or press the Enter key. Alternatively, you can use the Windows Explorer to view

the drive where the diskette is inserted, and double click on the “setup.exe” file.

•Follow the on screen instructions and select the drive and folder you would like the software installed

on. The LM87 evaluation software uses approximately 3 Megabytes of disk space.

•Some features of the program require that Adobe Acrobat Reader be installed on the system. If this

software is not present, primary software functions are available, but you will not be able to access the

LM87 datasheet, evaluation board schematic, and user manual files. The Adobe Acrobat Reader

software is available at: http://www.adobe.com/acrobat/

1.2 Board Preparation and Connection

•Make sure the jumpers are placed on the evaluation board at JP1, JP5, JP6-+5V, JP6-FAN/AIN1, JP6-

FAN/AIN2, JP6-CI, JP7-INT# are installed.

•Run the software by clicking on the Windows “Start” button, then selecting “Programs->LM87 -

>LM87Eval” to launch the program.

•Select the parallel printer port address and the device address of the evaluation board (default 00 with

ADD_HI and ADD_LO not installed).

•Connect the board to the parallel printer port of the PC directly or through a cable less than 6 feet (2

meters) long.

- 3 -

2.0 Software

2.1 Launching the Program

To start the software, go to the Windows ‘Start - Programs’ menu and select ‘LM87 – LM87Eval’.

2.2 Operation

•The software provides most of the commonly used information on the main panel. A series of menus

are used to provide the following additional functions:

•File – Provides ability to load and save communication and watchdog limit settings. Also provides exit

mechanism from the software.

•Communication Settings – Communications port and SMBus address settings.

•Registers – Provides access to all LM87 registers.

•Help – The LM87 datasheet, this manual and the evaluation board schematic can be accessed.

2.3 Initial Settings

When first launched, the software is configured for the following default communication settings:

•Parallel printer port address = 0x3F8h

•LM87 SMBus address bits = 00b

If different settings are required, adjust them through the Communication Settings menu. These alternate

communication settings can be saved to disk by using the File-Save Communication Settings menu choice.

Previously saved Communication Settings can be loaded via the File-Load Communication Settings menu

item.

2.4 Power On

Click on the “DUT Power Off” button on the screen. The button text will change to “DUT Power On” and

power will be applied to the LM87 through the parallel port. The board is now ready for communication.

At this point, the state of all registers in the LM87 can be read. The Values, Limit Settings and Status Bits

displayed in the main panel can be updated by clicking on the button labeled “Get All Values”.

2.5 Configuration Registers

Additional Configuration and Control registers are accessed by selecting the menu “Registers”. These

additional choices provide the following functions:

•Channel Mode Register > This configures the device for the alternate input functions.

•Configuration Register 1 > This is used to configure basic features.

•Configuration Register 2 > This is used to configure more advanced features.

•DAC Setting Register > This allows easy adjustment of the fan drive DAC.

•VID Reading > This allows all 5 VID bits to be observed.

•User Choice > This panel provides Read/Write access to any register in the device.

•Test Register > Bit 0 allows the LM87 to be placed in the low power standby mode.

2.6 Starting Conversions

The LM87 default wakeup state is powered up, but NOT converting. To start Analog to Digital

conversions, Configuration Register 1 must be adjusted. Open the Configuration Register 1 menu panel.

The initial setting should be all 0’s except Bit 3. To start conversions, change Bit 3 to 0 and set Bit 0 to 1.

To change the state of any bit, simply click in the white bit position box and the value will change (The

main panel and click on “Get All Values” again. This will update all of the displayed readings with the

newly converted values.

- 4 -

2.7 Basic Operation and Main Panel Functions

As previously stated, clicking on the “Get All Values” button updates all value and limit displays on the

main panel. Additional features of the main panel include:

•Clicking in any white “Value” box causes the latest data to be displayed for that box.

•Clicking on any “Change” button allows the associated upper or lower limit to be changed.

•The “+2.5V”, “Vcc 3.3V”, and “FAN” buttons allow the alternate functions for those inputs to be

selected directly from the front panel. The main panel display is reformatted and the appropriate mode

bit in the Channel Mode Register is set or cleared. When “FAN” mode is selected, pull-down menus

are available to set the internal clock divisor used for each FAN counter channel.

•The “Loop” buttons in the Temperature Measurement section cause the software to read and display

updated temperature values approximately every second. This data can be logged to a text file is

desired.

•Separate “Read” buttons are provided to read the latest interrupt status and mask register settings. Note

that reading the status registers clears the status bits for certain channels.

•Individual interrupt mask bits can be set by clicking in the appropriate check box.

•A separate “Reset” button is provided to reset the external CI (Chassis Intrusion) circuit. An opaque

cover must be placed over the light sensor before initiating the reset operation. After the Reset, two

reads of the Interrupt Statusregister #2 can be performed to confirm that the Chassis Intrusion circuit

has been reset.

•The Alarm Outputs section displays the status of the Int# output and provides a button to test the “Alert

Response” feature of the LM87. The Int# jumper must be installed on the evaluation board to allowing

monitoring of the Int# output. During the Alert Response test, the Enable Alert Response bit in

output is active, the LM87 will replyto the Alert Response read. *Note: The Alert Response test will

fail if the Int# is not active and/or enabled.

2.8 Additional Information

The Help menu provides access to the LM87 datasheet, this manual, and a schematic of the evaluation

board. Please refer to the LM87 datasheet for detailed information on device operation.

2.9 Troubleshooting and Common Problems

There are several common problems that can occur when using the LM87 Evaluation board.

1. The most common error message seen is “SMB Acknowledge Error” which indicates that the LM87 is

not responding with an acknowledge when expected. The most common causes of this error are:

•No power applied to LM87 device. This can be caused by missing jumpers, poor connection

between the evaluation board and parallel port, or the incorrect parallel port address setting. Check

all of these possible causes and try again.

•Wrong SMBus address setting. Check the address jumpers and the SMBus address setting.

2. Another common error is “Fatal Error: Bus Not Recovering – SDA low”. The most common cause is

an incorrect parallel port address setting. If the wrong parallel port address is set, power and

communications will not be directed to the port that the LM87 Evaluation board is on. Set the address

to the proper value, and try again.

- 5 -

3.0 LM87 Evaluation Board Hardware Details

The schematic for the LM87 evaluation board is shown in FIGURE 2. The backup battery (BT1) for the

Chassis Intrusion circuitry has not been installed on the evaluation board. The recommended battery is a

Panasonic BR2330-1HE with 3V nominal cell voltage and 255 mAh capacity.

3.1 JP3

JP3, a four-pin header is provided for access to the SMBus and the power supply (V+ and GND) lines and

is described in TABLE 2.

Table 1 JP3 Description

Pin Number Description

1V+

2 SDA

3SCL

4 GND

This header may be used for daisy chaining multiple boards together by connecting the V+, SDA, SCL and

GND pins of the different boards.

3.2 JP5

The two pin header JP5 allows the disconnection of the on board voltage regulator, (an LP2950CZ-3.3)

from the parallel printer port connection. The board is shipped with a jumper in place, allowing the board to

derive all of its power from the parallel printer port.

Table 2 JP5 Power Supply Input Header Description

Pin Number Description

1 Input of the LP2950CZ-3.3

2 Parallel printer port rectifier

circuitry

3.3 JP1

The output of the LP2950CZ-3.3 is connected to the load circuitry through JP1. This allows the user to

optionallypower the LM87 and other circuitry with a voltage other than 3.3V. When daisy chaining boards

it may be necessary to supply an external power source connected to pin 1 of JP1. When using an external

supply, ensure that the voltage does not exceed the specifications of any of the Vcc powered circuitry.

Table 1 JP1 Power Supply Output Header Description

Pin Number Description

1 Vcc powered circuitry

2 Output of the LP2950CZ-3.3

- 6 -

3.4 JP6

The 22-pin header JP6 allows access to the analog inputs, fan inputs, DAC output and Chassis Intrusion

input of the LM87. The board comes shipped with shorting bars installed across the following pins:

Pins 7 and 8

Pins 15 and 16

Pins 17 and 18

Pins 19 and 20

Table 2 JP6 Description

Pin Number Description

1 GND

2 Pin 19 of LM87, Vccp1

3 GND

4 Pin 18 of LM87, +2.5Vin/D2+

5 GND

6 Pin 17 of LM87, Vccp2/D2-

7 Regulated 3.3V from pin 2 of JP1

8 Pin 16 of LM87, +5.0Vin

9 GND

10 Pin 15 of LM87, +12Vin

11 C4, base of Q2, collector of Q2B (alternate D1+ sensor)

12 Pin 14 of LM87, D1+

13 C4, emitter of Q2, base of Q2B (alternate D1- sensor)

14 Pin 13 of LM87, D1-

15 Pin 4 of 74HCV14, used as a dummy fan oscillator

16 Pin 5 of LM87, FAN1/AIN1 input

17 Pin 2 of 74HCV14, used as a dummy fan oscillator

18 Pin 6 of LM87, FAN2/AIN2 input

19 R8 (chassis intrusion circuitry output)

20 Pin 7 of LM87, CI (Chassis Intrusion) input

21 GND

22 Pin 11 of LM87, DACOut/NTESTIN

- 7 -

3.5 JP7

The 20 pin header JP7 allows access to VID0-VID4, RESET#, INT# and THERM# input and outputs pins

of the LM87. The board comes shipped with shorting bars installed across the following pins:

Pins 9 and 10

as shown in FIGURE 1.

Table 3 JP7 Description

Pin Number Description

1 Pin 1 of LM87, ADD_HI (Connects ADD to Vcc through a 3.9k resistor)**

2Vcc

3 Pin 1 of LM87, ADD_LO (Connects ADD to GND through a 3.9k resistor)**

4 GND

5 Pin 2 of LM87, THERM#In (Allows THERM# to be jumpered to GND for input use)

6 GND

7 Pin 2 of LM87, THERM#Out (Allows THERM# to be monitored by software)

8 LED D5 cathode and Pin 11 of Connector P1 DB25 (parallel printer port)

9 Pin 10 of LM87, INT# (Allows INT# to be monitored by software)

10 LED D5 cathode and Pin 11 of Connector P1 DB25 (parallel printer port)

11 Pin 12 of LM87, RESET#

12 R5 and D7 (Allows PC to apply a Reset Input to the LM87 RESET#)

13 Pin 24 of LM87, VID0

14 GND

15 Pin 23 of LM87, VID1

16 GND

17 Pin 22 of LM87, VID2

18 GND

19 Pin 21 of LM87, VID3

20 GND

21 Pin 20 of LM87, VID4

22 GND

**Caution: Do NOT install jumpers for both ADD_HI and ADD_LO at the same time. This will short Vcc

to GND and can cause damage to the on board voltage regulator.

3.6 JP2 and JP4

In addition to these headers, JP2 has been provided to permit measurement of the LM87 supply current.

This connector is not installed in the circuit board. To measure the LM87 supply current, cut the printed

circuit board trace between pin 1 and pin 2 of JP2. Then install a two-pin header and measure the current

that flows between the two pins. A shorting jack can be used to operate the LM87 normally when you are

finished measuring. JP4 has been providing for monitoring the NTEST_OUT signal when evaluating the

NAND tree test mode of the LM87.

4 4

3 3

2 2

1 1

*Note: Install only QX or QXB at one time.

Note: Make a connection across

JP2 easy to cut on back of PCB.

0B2

LM87 DEMO/EVALUATION BOARD

Wednesda

, September 13, 2000

Title

Size Document Number Rev

Date: Sheet of

VCC

VCC4

VCC1

VCC2

VCC3

VCC1

VCC3

VCC4

VCC_BACKUP

VCC2

VCC5

VCC

VCC_BACKUP

GND

VCC

VCC5

VCC

JP4

TESTPOINT

0.1

R6 390 k

JP5

HEADER 2

R7 390 k

2.0 k

1N5712

2 1

Q1B

2N3906

C10

1.0

R10

2.0 k

1N5712

2 1

R11

5.1 k

1N5712

2N3904

1 3

1N5712

PD1

L14C2QT

CONNECTOR DB25

1N5712

2n2

2N3904

1 3

470k

10k

1N914

2 1 D10

1N914

BT1

Panasonic BR2330-1HE

Q3B

2N3906

LP2950CZ-3.3 13

INOUT

GND

Q2B

2N3906

LM20

5 1

V+

GNDNC

GND

JP6

HEADER 11X2

910

11 12

13 14

15 16

17 18

19 20

21 22

JP2

HEADER 2

R4 2.7 k

2N3904

1 3

LED

2 1

3.9k

2n2

U3D

74HCV14

9 8

JP7

HEADER 11X2

910

11 12

13 14

15 16

17 18

19 20

21 22

JP1

HEADER 2

U3A

74HCV14

12 C6

0.01

47k

0.01

U3B

74HCV14

1N5712

2 1

3.9 k

LM87

213

11 12

VID2

SDA

SCL

FAN1/AIN1

FAN2/AIN2

VID1

Vccp1

+2.5Vin/D2+

Vccp2/D2-

+5.0Vin

+12Vin

D1+

VID0

THERM#D1-

ADD/NTEST_OUT

VID3

INT#

DACOut/NTESTIN

RESET#

VID4

GND

V+

2N3904

1 3

JP3

HEADER 4

U3C

74HCV14

5 6

- 9 -

4.0 LM87 Evaluation Board Bill of Materials

Item Quantity Reference Part

______________________________________________

1 1 BT1 Panasonic BR2330-1HE 3V Lithium

(Not included)

2 3 C1,C4,C5 2n2

3 2 C2,C9 10u, 16V, 6032, 20%

4 1 C3 0.1u, 25v, 0805, +80%, -20%

5 3 C6,C7,C8 0.01u, 25V, 0805, 5%

6 1 C10 1.0u, 25V, 6032, 20%

7 7 D1-D4,D6,D7,D8 1N5817

8 1 D5 RED LED, HLMP-K150

9 2 D9,D10 1N914

10 3 JP1, JP5 HEADER 2X1

11 1 JP3 HEADER 4X1

12 1 JP4 TESTPOINT

13 2 JP7,JP6 HEADER 11X2

14 1 PD1 L14C2QT

15 1 P1 CONNECTOR DB25, MALE RIGHT ANGLE

16 0 Q1B,Q2B,Q3B 2N3906 (Not included)

17 1 Q1,Q2,Q3,Q4 2N3904 (Only Q3,Q4 installed)

18 2 R1,R1 3.9k, 1/8 W, TH, 5%

19 1 R4 2.7k, 1/8 W, TH, 5%

20 1 R5 47k, 1/8 W, TH, 5%

21 2 R6,R7 390k, 1/8 W, TH, 5%

22 1 R8 10k, 1/8 W, TH, 5%

23 1 R9 470k, 1/8 W, TH, 5%

24 1 R3,R10 2K, 1/8 W, TH, 5%

25 1 R11 5.1k, 1/8 W, TH, 5%

26 1 U1 LM87CIMT

27 0 U1-Socket OTS-24-0.55-01 (24 TSSOP ZIF)

28 1 U2 LP2950CZ-3.3

29 1 U3 74HCV14M

30 1 U4 LM20CIM7 (Not included)

31 7 N/A SHORTING JACKS

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