National Semiconductor LM64 Manuel utilisateur

LM64 Evaluation Board User’s Guide

Table of Contents

1.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3, 4

2.0 Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.1 Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.2 Optional Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.3 Test Setup – Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.4 Test Setup - Hardware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.5 Test Setup – System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.0 Connection Details. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4.0 Schematic of LM64 Evaluation Board . . . . . . . . . . . . . . . . . . . . . . . . . . 8, 9

5.0 Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

1.0 Introduction

The LM64EVAL kit includes the following items:

1. The LM64 Evaluation Board

2. The SensorEval Software CD, including

a. the readme.txt file (read this first)

b. the installation setup file,

c. the SensorEval Software manual, and

d. this manual.

3. Jumpers to use for testing the GPD or GPIO pins if desired.

The LM64 Evaluation Board, as shown in Figure 1 (without the socket lid for clarity), is a complete

PCBA (printed circuit board assembly). The board has a USB connector, a voltage regulator circuit, a

microcontroller, an EEPROM, and a LM64 Remote Diode Temperature Sensor with Integrated Fan

Control. A schematic and bill of materials is included in this User’s Guide. Figure 1 shows the location

of pin1 for proper orientation of the LM64 in the socket.

Figure 1. The LM64 Evaluation Board with Open Socket showing pin numbering convention.

The LM64EVAL kit includes the SensorEval software, which is provided by National Semiconductor to

communicate with the LM64 Evaluation Board by way of the USB cable (not provided) from the

controlling computer. The SensorEval software is used to control the writing and reading of the digital

registers in the LM64 for doing the initial register setup, reading the local and remote temperatures,

establishing certain temperature limit setpoints, and setting up fan control and tachometer monitoring

registers.

Pin 1

Pin 7

1.0 Introduction (Continued)

For the installation procedure for the SensorEval software see the readme.txt file on the SensorEval

software CD. For detailed use of the LM64 software used with the LM64 Evaluation Board, please

refer to the SensorEval software user’s guide on the CD. The LM64 datasheet is available at

www.national.com.

2.0 Getting Started

2.1 Required Equipment

In order to use the LM64 Evaluation Board you will need to have the following required pieces of

equipment:

1. A computer with at least a Pentium III processor, running MicrosoftWindows

98/2000/XP

operating system, with 20 MB of free disk space, and at least one USB port

2. A standard USB cable (3 foot length should be sufficient) for connecting the computer to the

LM64 Evaluation Board.

3. If you plan to test with a 3-terminal fan you must have:

a. A 3-terminal DC brushless fan rated at less than 0.40 Amp. Note that provisions are

made on the board for either a standard processor fan connector or holes for soldering

wires on the board.

b. A Power Supply capable of delivering the fan rated voltage (+12 VDC or +5 VDC) at

twice the rated fan current. A pair of wires from the power supply to a female header

connector to connect with J2, Fan Power input, is suggested.

If it is desired to run the software only, without the LM64 Evaluation board, omit items 2 and 3 and

proceed to paragraph 2.3.

2.2 Optional Equipment

Optional pieces of equipment are as follows:

1. Remote Diode with wired connector to connect to a female 2-pin header, 0.1 in centers

2. Test equipment such as a digital voltmeter or oscilloscope.

2.3 Test Setup - Software

First, see the readme.txt file on the SensorEval CD for the latest installation instructions. Follow the

installation procedures to load the software on the computer and, if desired, to verify the operation of

the LM64 Evaluation Board.

The SensorEval icon will be on the desktop window after the software installation.

If it is desired to run the software without the LM64 Evaluation Board please proceed to the Software

User’s Guide on the SensorEval CD.

For use with the LM64 Evaluation Board disconnect the USB cable from the board and proceed to the

next section for the hardware setup.

Microsoft, Windows, and XPare registered trademarks of Microsoft Corporation.

2.0 Getting Started (continued)

2.4Test Setup – Hardware

Figure 2 below shows an example of a typical LM64 Evaluation Board test setup for driving fans,

attaching remote diodes, and monitoring the system.

Figure 2. Test Setup using the LM64 Evaluation Board

For the first time user, no jumpers are required on headers JP1, JP2, or JP3 for operation of the basic

temperature measuring and fan control functions. Details about these headers, and connections to

them, will be discussed later in this User Guide.

Hardware Test Setup Procedure

1. Before connecting the power supply to the LM64 Evaluation Board, turn it on and set the

output voltage to the voltage rating of the fan (+5 or +12 VDC). Turn the power supply off.

2. Connect the power supply to the LM64 Evaluation Board jack J2 as shown in Figure 2. Make

sure that the positive terminal is connected to V+ and the negative terminal is connected to the

GND of J2.

3. Plug in the fan as shown in Figure 2. This pinout is standard for PC processor fans.

4. The LM64 Evaluation Board comes with jumpers installed on J4, which connects the on-board

MMBT3904 diode-connected transistor to the input of the LM64 chip.

5. Connect the USB cable from the computer’s USB port to the LM64 Evaluation Board

6. Turn on the fan power supply.

7. Start the SensorEval software.

LM64

Fan Power

National Semiconductor

LM64 Evaluation Board

Tach

V+

V-

GND

SDA

SCL

ALERT#

TCRIT

VDC

USB

V+

GND

JP3

+12 VDC or +5 VDC

Fan Power Supply

No jumpers required.

May be used to test GPD’s and GPIO’s

No Jumpers

Required

Black Lead

Computer

USB

Port

Connection

GPD5

GPD4

GPD3

GPD2

GPD1

JP1

GPIO5

GPIO4

GPIO3

GPIO2

GPIO1

JP2

D+

D-

Test

Socket

2.0 Getting Started (continued)

2.5Test Setup – System

For proper fan control follow the following procedure, using SensorEval as described in the

SensorEval software manual.

Change Register 4A as follows:

1. Set the PWM Clock Select to 1.4 kHz

2. Change the Tachometer Mode to the most accurate reading mode

3. You may change the polarity, if desired, but the traditional mode is

with the fan off at 0V.

Change Register 4B, if desired, to change the Fan Spinup PWM Duty Cycle and Spinup Time.

Change Register 4C to 10 hex.

The fan should now start running.

For continuous temperature and tach readings select the read continuous check box. You may also

log the data to a file.

IMPORTANT!

Registers 4A, 4B, 4D and then either 4C (PWM Value) or the Lookup Table in

Registers 4F through 5F must be programmed in that order for the initial fan control

setup. If the Lookup Table was selected then write Register 4A, bit 5.

[Note: In the example on the following pages we will be selecting bit(s) in Register

4C]

3.0 Connection Details

Table 1 below describes all the connections and test points of the LM64.

Table 1. LM64 Evaluation Board Connections and Test Points

Symbol

Description of the Connections

J2 Fan Power – connect the power supply for the fan to the V+ pin (+12 or +5) and the

negative to GND.

J3 Connect the 3-terminal fan to the header, paying attention to the black lead going to the V-

pin. Three holes are provided on the circuit board if the user wants to solder the fan leads

to the board.

J4 This allows the user to either: (1) connect jumpers horizontally to the top and bottom pin

pairs to connect to the on-board MMBT3904 or (2) to remove the jumpers and connect a

remote diode directly to the input of the LM64.

JP1 General Purpose Default (GPD) pins on the bottom row can be manually jumpered to

ground (to row of pins).

JP2 General Purpose Input/Output (GPIO) pins (right vertical row of pins) can be manually

jumpered to ground (left vertical row of pins).

JP3 TCRIT and ALERT# are the open drain LM64 output pins. A0, the LM64 input address pin,

can be manually jumpered to the GND pin to test the A0 function. VDC (+3.3 VDC), and

the SMBus Clock and Data signals are available to the user for system monitoring.

Figure 3. Header Connectors on the LM64 Evaluation Board

V+

GND

Ground rows

Tach

V+

V-

GPIO5

GPIO4

GPIO3

GPIO2

GPIO1

JP2

GPD5

GPD4

GPD3

GPD2

GPD1

JP1

GND

SDA

SCL

ALERT#

TCRIT

VDC

JP3

D+ of LM64

D- of LM64

MMBT3904

Jumper

Connection to On-board

Remote Diode

B, C

D+ of LM64

D- of LM64

Connection to off-the-board

Remote Diode

4.0 Schematic of the LM64 Evaluation Board

0.1uF

+ 3.3 VDC

R3 22

R5 1.5K

AT24C02-10SI-2.7

Vss

Vcc

SCL

SDA

GPIO3

C14

0.1uF

SDA

CY7C64603-52NC

RESERVED_3

WAKEUP#

RESERVED_2

XCLKSEL

SCL

Vcc1

SDA

Vcc2

PA4/FWR#

PA5/FRD#

AVcc

PB0/T2

Gnd2

AGnd

XIN

XOUT

PB1/T2EX

PB2/RXD1

PB3/TXD1

PB4/INT4

PB5/INT5#

PB6/INT6

PB7/T2OUT

PC0/RxD0

PC1/TxD0

PC2/INT0#

PC3/INT1#

PC4/T0

PC5/T1

PC6/WR#

PC7/RD#

USBD+

USBD-

DISCON#

RESERVED_1

CLKOUT

RESET#

Vcc3

Gnd4

Gnd5

Gnd6

Vcc4

RDY2/AOE

CTL0/AINFLAG

CTL2/AOUTFLAG

XCLK

RESERVED_4

RESERVED_5

RESERVED_6

RESERVED_7

Gnd1

Gnd3

0.1uF

PWM

1.5K

0.1uF

Alert#

USB-B

VBUS

D-

D+

GND

SHELL_1

SHELL_2

Use a 0.1 uF capacitor for each

Vcc pin of U2 and Reserved_6 pin.

GND

LP2950CDT-3.3/TO252

1 3

IN OUT

C11

2.2uF

GPIO4

Tach In

0.1uF

C10

0.1uF

SCL

C12

0.1uF

PWM (Page 2)

0.1uF

Tach In

GPIO1

2.2uF

SDA

100k

12 MHz

33pF

TACH IN (Page 2)

GPIO5

SCL

33pF

TCRIT

R4 22

PWM

0.1uF

+ 3.3 VDC

GPIO2

SCL

SDA

1 uH

C13

0.1uF

+ 3.3 VDC

Figure 5a. LM64 Evaluation Board Schematic, Page 1 of 2

4.0 Schematic of the LM64 Evaluation Board (Continued)

+ 3.3 VDC

R18

FAN -

R13

10 k

SCL

GPIO1

SDA

TCRIT

SDA

+ 3.3 VDC

Alert#

HEADER 3x2/SM

JP1

GPD1

C17

2.2uF

C16

.01

SCL

137

1 19

PWM

VDD

D+

GNDD-

ALERT#

SMBDAT

TACH

SMBCLK

GPIO5

GPIO3

GPIO2

GPIO1 GPIO4

TCRIT#

N/C

GPD5

GPD4

GPD3

GPD2

GPD1

MMBT2222A/SOT

MMBT3904/SOT

C18

0.01uF

SDA

R23

1.5 k

R12

10 k

+3.3 VDC

R22

1.5 k

C15

2.2 uF

GPIO5

R27

17 V

GPD2

TP3

R17 10 k

R25

430

PWM

GPIO2

R21

1.5 k

Tach In

To the SDA and SCL Lines on

Page 1 (See U2 pins 2 and 3) TO FAN

SCL

R9 10 k

JP2

R28

13k

GPIO3

R20

FAN POWER V+

GPD INPUT

TCRIT

SDA

R11 10 k

R19 10 k

ZMM5247/D0213AA/17V

GND

+ 3.3 VDC

C20

2.2 nF

GPIO REGISTERS

TCRIT

GPIO2

GPIO4

GPD3

R10 10 k

FAN POWER RTN

+ 3.3 VDC

GPIO3

Alert#

PWM

HEADER 1X7

GPD5

LM64

GPIO4

JP3

R15

10 k

HEADER 2x2

C19

100 pF

R26

GPD4

GPIO1

R16

10 k

SCL

GPIO5

R29

10k

FAN

POWER

R14

10 k

ALERT#

Figure 5b. Schematic of LM64 Evaluation Board – Page 2 of 2

5.0 LM64 Evaluation Board - Bill of Materials

Item Quantity Reference Part

______________________________________________

1 10 C1,C2,C3,C4,C5,C6,C10, Capacitor, ceramic,0.1uF

C12,C13,C14

2 2 C7,C8 Capacitor, ceramic,33pF

3 4 C9,C11, C15, C17 Capacitor, ceramic,2.2uF

4 2 C16, C18 Capacitor, ceramic,.01 uF

5 1 C19 Capacitor, ceramic,100 pF

6 1 C20 Capacitor, ceramic,2.2 nF

7 1 D1 Zener Diode ZMM5247/17V

8 2 JP1,JP2 HEADER, 2X5

9 1 JP3 HEADER, 1X7

10 1 J1 Connector, USB-B

11 2 J2, J4 HEADER 2x2

12 1 J3 HEADER 3x2

13 1 L1 Filter, 1uH, Stewart MI1206K900R-00

14 1 Q1 Transistor, NPN, MMBT3904/SOT

15 1 Q2 Transistor, NPN, MMBT2222A/SOT

16 1 R1 Resistor, SMT, 100k

17 2 R2,R6 Resistor, SMT,1M

18 2 R4,R3 Resistor, SMT,22 Ohm

19 3 R5,R7,R8 Resistor, SMT,1.5 k

20 11 R9,R10,R11,R12,R13,R14, Resistor, SMT,10 k

R15,R16,R17,R19, R29

21 1 R18 Resistor, SMT,0 Ohm

22 2 R27,R20 Resistor, SMT,2k

23 3 R21,R22,R23 Resistor, SMT,1.5 k

24 1 R25 Resistor, SMT,430 Ohm

25 1 R26 Resistor, SMT,10 Ohm

26 1 R28 Resistor, SMT,13k

27 1 S1 LM64 Test Socket, Loranger custom, $36.00

28 6 TP1,TP2,TP3,TP4,TP5,TP6 T POINTS (1X1 Headers)

29 1 U1 IC, 3.3 VDC Voltage Regulator, National LP2950CDT-3.3

30 1 U2 IC, microcontroller, Cypress CY7C64603-52NC

31 1 U3 IC, EEPROM, Atmel AT24C02-10SI-2.7

32 1 U4 LM64CILQ Device Under Test

33 1 Y1 Crystal, 12 MHz, Pletronics 2S1200G140

34 1 Circuit Board, Fabricated, LM64 Evaluation Board, Rev 1.1

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