1
LM64 Evaluation Board User’s Guide
Copyright 2003 National Semiconductor Corporation
1
2
Table of Contents
1.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3, 4
2.0 Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1
2.2
2.3
2.4
2.5
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Optional Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Test Setup – Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Test Setup - Hardware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
2
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.
Pin 1
Pin 7
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.
3
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/XP1
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.
4
5
2.4 Test Setup – Hardware
2.0 Getting Started (continued)
Figure 2 below shows an example of a typical LM64 Evaluation Board test setup for driving fans,
attaching remote diodes, and monitoring the system.
+12 VDC or +5 VDC
Fan Power Supply
No jumpers required.
May be used to test GPD’s and GPIO’s
National Semiconductor
JP1
LM64 Evaluation Board
GPD5
GPD4
GPD3
GPD2
GPD1
JP2
Fan Power
GPIO5
GPIO4
GPIO3
GPIO2
GPIO1
J4
Q1
Computer
USB
Port
Connection
D+
D-
Test
Socket
LM64
USB
J2
J3
TCRIT
GND
A0
ALERT#
SCL
SDA
VDC
V+
GND
Tach
V+
V-
Black Lead
JP3
No Jumpers
Required
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.
5
6
2.5 Test Setup – System
2.0 Getting Started (continued)
For proper fan control follow the following procedure, using SensorEval as described in the
SensorEval software manual.
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]
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.
6
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
Description of the Connections
Symbol
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 Vpin. 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.
V+
GND
J2
J3
Tach
V+
V-
TCRIT
GND
A0
Ground rows
JP1
GPD1
GPD2
GPD3
GPD4
GPD5
JP2
ALERT#
GPIO5
SCL
GPIO4
SDA
GPIO3
VDC
GPIO2
GPIO1
Connection to On-board
Remote Diode
Connection to off-the-board
Remote Diode
Jumper
MMBT3904
B, C
E
JP3
D+ of LM64
D+ of LM64
J4
J4
D- of LM64
D- of LM64
Jumper
Figure 3. Header Connectors on the LM64 Evaluation Board
7
8
4.0 Schematic of the LM64 Evaluation Board
Use a 0.1 uF capacitor for each
Vcc pin of U2 and Reserved_6 pin.
+ 3.3 VDC
C1
0.1uF
C2
0.1uF
C3
0.1uF
C4
0.1uF
C5
0.1uF
GPIO1
GPIO2
GPIO3
C6
0.1uF
GPIO4
C7
33pF
+ 3.3 VDC
U1
LP2950CDT-3.3/TO252
D+
GND
SHELL_1
SHELL_2
4
R3 22
2
24
R4 22
3
4
5
6
25
R5 1.5K
Vcc
A1
WP
A2
SCL
Vss
SDA
USBD-
7
R7
1.5K
R8
1.5K
SCL
2
5
SDA
3
SCL
SDA
7
PC2/INT0#
PC3/INT1#
PC4/T0
PC5/T1
PC6/WR#
PC7/RD#
CLKOUT
C14
0.1uF
6
XOUT
6
U2
DISCON#
CY7C64603-52NC
12
8
PB6/INT6
CTL2/AOUTFLAG
CTL0/AINFLAG
35
GPIO5
37
41
USBD+
+ 3.3 VDC
R6
1M
A0
18
RESET#
XIN
28
1
20
29
30
31
32
33
34
1M
C13
0.1uF
U3
AT24C02-10SI-2.7
3
R1
100k
C12
0.1uF
RESERVED_7
PB0/T2
PB1/T2EX
PB2/RXD1
PB3/TXD1
PB4/INT4
PB5/INT5#
D-
C11
2.2uF
PA4/FWR#
PA5/FRD#
PB7/T2OUT
PC0/RxD0
PC1/TxD0
45
PWM
46
Tach In
48
49
50
51
SCL
SDA
10
11
36
43
44
PWM (Page 2)
Tach In
TACH IN (Page 2)
A0
SCL
SDA
Figure 5a. LM64 Evaluation Board Schematic, Page 1 of 2
8
PWM
TCRIT
Alert#
4
8
13
21
26
39
47
52
16
38
42
9
15
17
22
23
VBUS
C10
0.1uF
C8
33pF
R2
WAKEUP#
AGnd
Gnd1
Gnd2
Gnd3
Gnd4
Gnd5
Gnd6
XCLKSEL
XCLK
RDY2/AOE
RESERVED_1
RESERVED_2
RESERVED_3
RESERVED_4
RESERVED_5
C9
2.2uF
J1
USB-B
2
3
GND
1 uH
1
OUT
5
1
14
27
40
19
L1
IN
AVcc
Vcc1
Vcc2
Vcc3
Vcc4
RESERVED_6
1
Y1
12 MHz
9
7
5
10 9
8
6
1
2
4
GPD INPUT
3
4.0 Schematic of the LM64 Evaluation Board (Continued)
JP1
R9 10 k
R10 10 k
ZMM5247/D0213AA/17V
J2
2
4
FAN POWER V+
R11 10 k
C15
2.2 uF
R17 10 k
C16
.01
1
3
D1
17 V
FAN
POWER
FAN POWER RTN
R19 10 k
+ 3.3 VDC
C17
C18
2.2uF
0.01uF
+ 3.3 VDC
C19
100 pF
R12
10 k
R18
0
R13
10 k
R14
10 k
R15
10 k
R16
10 k
GPIO2
6
C20
2.2 nF
7
D+
D-
PWM
GPD2
GPD1
21
20
GPD1
GPD3
GPD2
GPD4
22
GPD3
GPD5
23
GPD5
GPD4
GPIO4
GPIO5
SMBDAT
VDD
TACH
8
HEADER 2x2
J4
LM64
PWM
ALERT#
A0
3
1
GPIO5
GND
2
1
4
3
6
5
8
7
R27
2k
GPIO REGISTERS
J3
To the SDA and SCL Lines on
Page 1 (See U2 pins 2 and 3)
5
3
1
6
4
2
FAN -
10 9
HEADER 3x2/SM
19
GPIO4
18
SCL
GPIO5
+3.3 VDC
SDA
SCL
17
SDA
16
15
Tach In
SCL
SCL
SDA
SDA
+ 3.3 VDC
ALERT#
14
A0
13
R21
1.5 k
R22
1.5 k
R23
1.5 k
JP3
1
3
2
4
5
6
R28
13k
12
4
2
GPIO4
SMBCLK
N/C
5
GPIO3
11
4
N/C
PWM
10
GPIO3
Q1
MMBT3904/SOT
GPIO2
N/C
3
TCRIT#
2
GPIO2
GPIO1
9
1
24
GPIO3
GPIO1
R20
2k
JP2
GPIO1
TCRIT
7
HEADER 1X7
Alert#
Alert#
A0
A0
TCRIT
TCRIT
+ 3.3 VDC
R29
10k
TP3
R26
10
GND
R25
430
Q2
MMBT2222A/SOT
Figure 5b. Schematic of LM64 Evaluation Board – Page 2 of 2
9
TO FAN
10
5.0 LM64 Evaluation Board - Bill of Materials
Item Quantity
Reference
Part
______________________________________________
1
10
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
2
4
2
1
1
1
2
1
1
2
1
1
1
1
1
2
2
3
11
21
22
23
24
25
26
27
28
29
30
31
32
33
34
1
2
3
1
1
1
1
6
1
1
1
1
1
1
C1,C2,C3,C4,C5,C6,C10, Capacitor, ceramic,0.1uF
C12,C13,C14
C7,C8 Capacitor, ceramic,33pF
C9,C11, C15, C17 Capacitor, ceramic,2.2uF
C16, C18 Capacitor, ceramic,.01 uF
C19
Capacitor, ceramic,100 pF
C20
Capacitor, ceramic,2.2 nF
D1
Zener Diode ZMM5247/17V
JP1,JP2 HEADER, 2X5
JP3
HEADER, 1X7
J1
Connector, USB-B
J2, J4 HEADER 2x2
J3
HEADER 3x2
L1
Filter, 1uH, Stewart MI1206K900R-00
Q1
Transistor, NPN, MMBT3904/SOT
Q2
Transistor, NPN, MMBT2222A/SOT
R1
Resistor, SMT, 100k
R2,R6 Resistor, SMT,1M
R4,R3 Resistor, SMT,22 Ohm
R5,R7,R8
Resistor, SMT,1.5 k
R9,R10,R11,R12,R13,R14, Resistor, SMT,10 k
R15,R16,R17,R19, R29
R18
Resistor, SMT,0 Ohm
R27,R20 Resistor, SMT,2k
R21,R22,R23 Resistor, SMT,1.5 k
R25
Resistor, SMT,430 Ohm
R26
Resistor, SMT,10 Ohm
R28
Resistor, SMT,13k
S1
LM64 Test Socket, Loranger custom, $36.00
TP1,TP2,TP3,TP4,TP5,TP6 T POINTS (1X1 Headers)
U1
IC, 3.3 VDC Voltage Regulator, National LP2950CDT-3.3
U2
IC, microcontroller, Cypress CY7C64603-52NC
U3
IC, EEPROM, Atmel AT24C02-10SI-2.7
U4
LM64CILQ Device Under Test
Y1
Crystal, 12 MHz, Pletronics 2S1200G140
Circuit Board, Fabricated, LM64 Evaluation Board, Rev 1.1
10
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