Note the following details of the code protection feature on Microchip devices:
•Microchip products meet the specification contained in their particular Microchip Data Sheet.
•Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip's Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•Microchip is willing to work with the customer who is concerned about the integrity of their code.
•Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
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with express written approval by Microchip. No licenses are
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, MPLAB, PIC, PICmicro, PICSTART,
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in the U.S.A.
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The Company’s quality system processes and
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devices, Serial EEPROMs, microperipherals,
non-volatile memory and analog products. In
addition, Microchip’s quality system for the
design and manufacture of developmen t
systems is ISO 9001 certified.
Thank you for purchasing the TC64X/TC64XB Fan Control Demo Board from
Microchip Technology Inc. The TC64X/TC64XB Fan Control Demo Board allows the
user to quickly prototype fan control circuits based on Microchip’s pulse width
modulation (PWM) Fan Control integrated circuits.
These devices will be referred to as TC64X in this document:
•TC642
•TC646
•TC647
•TC648
•TC649
These devices will be referred to as TC64XB in this document:
•TC642B
•TC646B
•TC647B
•TC648B
•TC649B
DEMO BOARD USER’S GUIDE
A versatile sensor input and output driver circuitry allows the Fan Control Module to be
used with virtually any brushless DC fan and standard thermistor. An optional LED
status indicator gives a visual indication of a fan fault (stalled, open or unconnected fan)
or an overtemperature condition.
The TC64X/TC64XB Fan Control Demo Board has the following features:
1. Complete implementation of TC64X or TC64XB fan control circuitry on a
1.5" x 2.0" board
2. Works with standard thermistors
3. Temperature-proportional fan speed control
4. Overtemperature fault detection
5. Fan fault detection
6. Installs directly into user's end equipment
7. Speeds up prototyping, system development and system thermal
characterization
2003 Microchip Technology Inc.DS21401C-page 1
Page 6
TC64X/TC64XB Fan Control Demo Board User’s Guide
1.2THE TC64X/TC64XB FAN CONTROL DEMO BOARD
The TC64X/TC64XB Fan Control Demo Board (Figure 1-1) measures only 1.5” x 2.0”,
allowing direct installation to the user’s end equipment for system evaluation. It uses
through-hole components for easy assembly and evaluation.
The kit is shipped with the following items:
1. TC64X/TC64XB Fan Control Demo Board
2. Demo and Evaluation Kit Software and Documentation CD, DS51306
The CDROM contains:
•Device Data Sheets
•TC64X/TC64XB Fan Control Demo Board User’s Guide, DS21401
3. Sample Devices:
Device
PDIPSOIC
TC642BTC642BEPATC642BEOA
TC646BTC646BEPATC646BEOA
TC647TC647VPATC647VOA
TC647BTC647BEPA TC647BEOA
TC648TC648VPATC648VOA
TC648BTC648BEPATC648BEOA
TC649TC649VPATC649VOA
TC649BTC649BEPATC649BEOA
The components that are populated on the TC64X/TC64XB Fan Control Demo Board
are listed in Table B-1 of the Appendix B section. If any component is damaged or
missing, please contact your nearest Microchip sales office, listed on the back of this
publication.
Part Number
DS21401C-page 2 2003 Microchip Technology Inc.
Page 7
1.3REFERENCE DOCUMENTS
The following is recommended reading:
• Technical Library CD-ROM, DS00161
• Analog & Interface Families Data Book 2002, DS00207
• 2002 Technical Documentation Analog & Interface Product Families CD-ROM,
DS51205
• AN768, “Redundant Fan Systems Using the TC642 Fan Manager”, DS00768,
Microchip Technology Inc., 2002
• AN770, “Linear Voltage Fan Speed Control Using Microchip’s TC64X Family”,
DS00770, Microchip Technology Inc., 2003
• AN771, “Suppressing Acoustic Noise in Pulse Width Modulation (PWM) Fan
Speed Control Systems”, DS00771, Microchip Technology Inc., 2003
• AN772, “Speed Error in Pulse Width Modulation (PWM) Fan Control Systems”,
DS00772, Microchip Technology Inc., 2003
TC642 Fan Speed Control Module for TC64X Family Sell Sheet, DS51251
Other Reference Documents may be obtained by contacting your nearest Microchip
sales office (listed on the back of this document).
The Microchip web site (www/microchip.com) also contains a wealth of documentation.
Individual data sheets, application notes, tutorials and user’s guides are all available
for easy download.
General Information
2003 Microchip Technology Inc.DS21401C-page 3
Page 8
TC64X/TC64XB Fan Control Demo Board User’s Guide
NOTES:
DS21401C-page 4 2003 Microchip Technology Inc.
Page 9
TC64X/TC64XB FAN CONTROL
M
DEMO BOARD USER’S GUIDE
Chapter 2. Getting Started
This chapter describes the TC64X/TC64XB Fan Control Demo Board’s configuration,
how it functions and lists typical fan demo board operating configurations for fan
applications.
2.1TC64X/TC64XB FAN CONTROL DEMO BOARD TYPICAL MODULE
CONFIGURATIONS
2.1.1Using Bipolar Driver Transistors
All component selections should be made based on the information provided in the
Applications section of the TC64X and TC64XB data sheets. Table 2-1 lists typical fan
module operating configurations for 12V fan applications. These are provided as a
guide only. The values in the table assume the use of low-cost, bipolar transistors, such
as 2N2222A, unless stated otherwise.
TABLE 2-1:SUGGESTED OUTPUT DRIVER/CURRENT SENSE VALUES
VS. FAN CURRENT
Full Speed
Fan Current
50 mA —X2.4 k9.1
100 mA—X1.1 k4.7
150 mA—X7503.0
200 mA—X6202.4
200 mAX—5.6 k2.4
250 mAX—4.7 k2.0
300 mAX—3.9 k1.8
350 mAX—3.3 k1.5
400 mAX—3.0 k1.3
450 mAX—2.4 k1.2
Darlington Pair
(Q
, Q2)
1
Single Transistor
(Q3)
R
(Ω)
5
R
(Ω)
6
Fan motors of 50 mA to 150 mA can be driven using the single transistor driver
configuration (i.e., Q
of 200 mA may be driven using either the single transistor or Darlington configurations.
If a single transistor is used, care must be taken to select a transistor having a minimum
h
of at least 50 to ensure the minimum output current specification (5 mA) of the
FE
TC64X and TC64XB devices is sufficient to saturate the transistor when it is conducting
the full fan current.
2003 Microchip Technology Inc.DS21401C-page 5
installed; Q1 and Q2 not installed). Fans having a motor current
3
Page 10
TC64X/TC64XB Fan Control Demo Board User’s Guide
2.1.2Using Logic Level MOSFETS
Substituting a logic level MOSFET for Q3 (such as a BS170) results in lower system
voltage losses and significantly reduces output loading on the TC64X and TC64XB
devices. The low R
used instead of the Darlington configuration in high-current fan applications. Refer to
the Applications section of the TC64X and TC64XB data sheets for details.
Population options for single transistor output drivers (using either MOSFET or bipolar
transistor) and the two transistor (Darlington) stage are shown in Figure 2-1.
of the MOSFET (1Ω in the case of the BS170) enables it to be
DSON
C
7
Q
1
Q
3
R
5
7
R
6
C
B
E
To F an (– )
(2N2222A)
Q
3
Q
2
R
5
Reverse Orientation of
Q
C
7
Q
and Jumper R
3
Jumper
7
R
5
1
Q
3
5
R
D
G
S
Q3 (BS170)
6
Q
2
R
5
To Fa n (– )
FIGURE 2-1:Output Driver Configuration Options
2.2SYSTEM CONNECTION FOR +5V OPERATION
Figure 2-2 shows typical wiring connections to the fan control module. The fan
operating voltage is +12V, while the fan control module operates from a supply voltage
of +5V. A NTC thermistor connects from the SENSOR input of the fan control module
to V
. Fan control module resistors R1 and R2 (See Figure A-2), in conjunction with
DD
characteristics of the NTC thermistor, determine the fan speed versus the temperature
profile of the system.
C
7
Q
R
5
7
Q
, Q2 = 2N2222A
1
C
C
B
B
E
1
Q
3
Q
1
R
Q
Q
2
6
E
2
To F a n (–)
R
5
+5V
Power Supply
+12V
GND
NTC
Thermistor
System
Shutdown
+
V
DD
SENSOR
V
AS/VMIN
FAULT
FAN(–)
GND
TC64X/TC64XB
Demo
Fan Control
Module
Fan
FIGURE 2-2:Typical Wiring Connections to Fan Module for +12V Fan and +5V Module Supply
DS21401C-page 6 2003 Microchip Technology Inc.
Page 11
TC64X/TC64XB FAN CONTROL DEMO
M
Appendix A. Board Layout and Schematic
A.1INTRODUCTION
This appendix contains general information concerning the layout, schematic and
components for the TC64X/TC64XB Fan Control Demo Board.
A.2BOARD LAYOUT AND SCHEMATIC
Figure A-1 depicts the layout for the TC64X/TC64XB Fan Control Demo Board.
Figure A-2 shows the schematic for the TC64X/TC64XB Fan Control Module.
+
C
V
DD
SENSOR
V
AS/VMIN
FAU LT
FAN (–)
GND
1
C
C
8
C
4
C
7
+
Q
1
Q
3
Q
R
3
R
1
2
C
3
2
R
5
BOARD USER’S GUIDE
R
4
R
2
R
7
U1
R
C
6
6
Q
4
C
5
R
8
Additional pads
+
LED
in series with
I.C. pins and
board input
connections
6-32
Drill
(4)
FIGURE A-1:TC64X/TC64XB Fan Control Demo Board Layout
2003 Microchip Technology Inc.DS21401C-page 7
Page 12
TC64X/TC64XB Fan Control Demo Board User’s Guide
V
DD
Sensor
Input
C
1
FAULT
10 µF
6
R
1
R
2
C
2
0.01 µF
Test Point
1
V
IN
V
U1
8
DD
C
8
0.01 µF
VAS/V
MIN
TC64X
VAS/V
C
F
TC64XB
MIN
SENSE
GND
4
R
3
3
C
3
0.01 µF
R
4
C
2
4
7
V
OUT
5
R
5
C
6
0.1 µF
FIGURE A-2:TC64X/TC64XB Fan Control Demo Board Schematic
Q
4
2N3906
R
7
1.2 kΩ
Q
3
C
0.47 µF - 1 µF
(Optional)
Optional
7
R8
470Ω
Q
1
FAULT
LED
Q
2
FAULT
V
OUT
R
6
GND
DS21401C-page 8 2003 Microchip Technology Inc.
Page 13
TC64X/TC64XB FAN CONTROL DEMO
M
BOARD USER’S GUIDE
Appendix B. Bill-of-Materials (BOM)
B.1DEMO BOARD COMPONENTS
Table B-1 lists typical components and the associated values that comprise the
TC64X/TC64XB Fan Control Demo Board.
TABLE B-1:FAN CONTROL MODULE COMPONENTS LIST
ComponentTypical ValueComments
C
1
C
2
C
3
C
4
C
5
C
6
C
7
C
8
LED10 mA Miniature LEDLED lights when FAULT
, Q
Q
1
2
Q
3
Q
4
R
, R
1
2
R
, R
3
4
R
5
R
6
R
7
R
8
U
1
10 µF Radial Electrolytic
Capacitor
0.01 µF Ceramic Disk Capacitor Bypass capacitor.
0.01 µF Ceramic Disk Capacitor Bypass capacitor.
1.0 µF Ceramic CapacitorPWM capacitor. Typical value is 1.0 µF (PWM frequency of 30 Hz).
Not used—
0.1 µF Ceramic Disk CapacitorSENSE input coupling capacitor.
0.47 µF to 1 µF Radial
Electrolytic Capacitor
0.01 µF Ceramic Disk Capacitor Bypass capacitor.
2N2222A NPN TransistorDarlington pair output option. If used, Q3 location MUST be left
See Applications section of
TC64X and TC64XB data
sheets.
2N3906 (or Equivalent) PNP
Transistor
See the Applications section of
the TC64X and TC64XB data
sheets.
See the Applications section of
the TC64X and TC64XB data
sheets.
See the Applications section of
the TC64X and TC64XB data
sheets.
See Applications section of the
TC64X and TC64XB data
sheets.
TC642/B, TC646/B, TC647/B,
TC648/B or TC649/B Fan
Control devices
Power supply filter.
Fan acoustic noise suppression capacitor. (Optional)
output is LOW (active). (Optional)
open.
Single transistor output option. Can be bipolar transistor or logic
level MOSFET (depending on cost constraints and fan current). If
used, Q
LED Driver transistor (Optional).
Value depends on the type of sensor used and the desired fan
speed vs. temperature profile.
Value depends on the desired minimum fan speed setting
(TC642/2B, TC647/7B) or auto-shutdown temperature (TC646/6B,
TC648/8B, TC649/9B).
Base current limiting resistor. Value depends on the type of fan and
driver used. Typical values appear in Table B-1.
Fan Current sensing resistor. Value depends on full-speed fan
current. Typical values are shown in Table B-1.
and Q2 locations MUST be left open.
1
2003 Microchip Technology Inc.DS21401C-page 9
Page 14
M
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