National Semiconductor LM64 User manual

1
1
LM64 Evaluation Board User’s Guide
Copyright 2003 National Semiconductor Corporation

2
2
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

3
3
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

4
4
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
1
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.
1
Microsoft, Windows, and XPare registered trademarks of Microsoft Corporation.

5
5
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
A0
SDA
SCL
ALERT#
TCRIT
VDC
USB
V+
GND
Q1
J4
J2
J3
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

6
6
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]

7
7
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
J2
Ground rows
Tach
J3
V+
V-
GPIO5
GPIO4
GPIO3
GPIO2
GPIO1
JP2
GPD5
GPD4
GPD3
GPD2
GPD1
JP1
GND
A0
SDA
SCL
ALERT#
TCRIT
VDC
JP3
D+ of LM64
D- of LM64
MMBT3904
Jumper
Jumper
Connection to On-board
Remote Diode
B, C
E
J4
D+ of LM64
D- of LM64
Connection to off-the-board
Remote Diode
J4

8
8
4.0 Schematic of the LM64 Evaluation Board
C2
0.1uF
+ 3.3 VDC
R3 22
R5 1.5K
U3
AT24C02-10SI-2.7
1
2
3
4
8
7
6
5
A0
A1
A2
Vss
Vcc
WP
SCL
SDA
A0
R2
1M
GPIO3
C14
0.1uF
SDA
U2
CY7C64603-52NC
17 4 15 16
2
1
3
14
10
11
5 29
21 8
6 7 30 31 32 33 34
35
36
43
44
45
46
48
49
50
51
25
24
18
9
12
28
27
39 47 52
40
42
41
37
38 22 23
19 20
13 26
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
C1
0.1uF
PWM
R8
1.5K
R7
1.5K
C4
0.1uF
Alert#
J1
USB-B
1
2
3
4
5
6
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
U1
LP2950CDT-3.3/TO252
1 3
IN OUT
C11
2.2uF
GPIO4
L1
Tach In
C6
0.1uF
C10
0.1uF
SCL
C12
0.1uF
PWM (Page 2)
C5
0.1uF
Tach In
GPIO1
C9
2.2uF
SDA
R1
100k
Y1
12 MHz
C8
33pF
TACH IN (Page 2)
GPIO5
R6
1M
SCL
C7
33pF
TCRIT
R4 22
PWM
C3
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

9
9
4.0 Schematic of the LM64 Evaluation Board (Continued)
+ 3.3 VDC
R18
0
FAN -
R13
10 k
A0
SCL
GPIO1
SDA
TCRIT
A0
SDA
+ 3.3 VDC
Alert#
J3
HEADER 3x2/SM
2
4
6
1
3
5
JP1
1 3 7 9 5
2 4 6 8 10
GPD1
C17
2.2uF
C16
.01
SCL
4
5
6
137
14
16
15
17
18
3
2
1 19
8 9 10 11 12
24 23 22 21 20
PWM
VDD
D+
GNDD-
ALERT#
SMBDAT
TACH
SMBCLK
GPIO5
GPIO3
GPIO2
GPIO1 GPIO4
TCRIT#
N/C N/C N/C A0
GPD5 GPD4 GPD3 GPD2 GPD1
Q2
MMBT2222A/SOT
Q1
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
A0
R27
2k
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
1
3
7
9
5
2
4
6
8
10
J2
34
12
R28
13k
GPIO3
R20
2k
FAN POWER V+
GPD INPUT
TCRIT
SDA
R11 10 k
R19 10 k
ZMM5247/D0213AA/17V
D1
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
1
3
4
5
6
7
2
R15
10 k
J4
HEADER 2x2
34
12
C19
100 pF
R26
10
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

10
10
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