2002 Microchip Technology Inc.
DS21450B-page 1
TC650/TC651
Features
Integrated Temperature Sensing and Multi-speed
Fan Control
Built-in Over Temperature Alert (T
OVER
)
Temperature Proportional Fan Speed Control for
Acoustic Noise Reduction and Longer Fan Life
Pulse Width Modulation Output Drive for Cost and
Power Savings
Solid-State Temperature Sensing
1
C (Typical) Accuracy from 25
C to +70
C
2.8V 5.5V Operating Range
TC651 includes Auto Fan Shutdown
Low Operating Current: 50
A (Typical)
Applications
Thermal Protection For Personal Computers
Digital Set-Top Boxes
Notebook Computers
Data Communications
Power Supplies
Projectors
Related Literature
Application Note: AN771
Device Selection Table
The "X" denotes a suffix for temperature threshold settings.
Contact factory for other temperature ranges.
Package Type
General Description
The TC650/TC651 are integrated temperature sensors
and brushless DC fan speed controllers. The TC650/
TC651 measure their junction temperature and control
the speed of the fan based on that temperature, making
them especially suited for applications in modern
electronic equipment.
Temperature data is converted from the on-chip
thermal sensing element
and
translated
into
a
fractional fan speed from 40% to 100%. A temperature
selection guide in the data sheet is used to choose the
low and high temperature limits to control the fan. The
TC650/TC651 also include a single trip point over
temperature alert (T
OVER
) that eliminates the need for
additional temperature sensors. In addition, the TC651
features an auto fan shutdown function for additional
power savings.
The TC650/TC651 are easy to use, require no software
overhead and are therefore the ideal choice for
implementing thermal management in a variety of
systems.
Part Number
Package
Temperature
Range
TC650XXVUA
8-Pin SOIC
-40
C to +125
C
TC651XXVUA
8-Pin MSOP
-40
C to +125
C
X
Temperature
A
25
B
30
C
35
D
40
E
45
F
50
G
55
1
8
2
7
3
6
4
5
NC
V
DD
PWM
GND
T
OVER
NC
GND
8-Pin MSOP
TC650
TC651
SHDN
8-Pin SOIC
Tiny Integrated Temperature Sensor & Brushless DC Fan
Controller with Over-Temperature Alert
TC650/TC651
DS21450B-page 2
2002 Microchip Technology Inc.
Typical Application Diagram
1
8
2
7
3
6
4
5
NC
V
DD
C
SLOW
PWM
GND
T
OVER
NC
GND
GND
+5V V
DD
+12V
TC650
TC651
SHDN
GND
Controller
DC Fan
500mA
SHDN Control Over-Temp.
Alert
2002 Microchip Technology Inc.
DS21450B-page 3
TC650/TC651
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Input Voltage (V
DD
to GND) ................................... +6V
Output Voltage (OUT to GND) ................................. 6V
Voltage On Any Pin ....... (GND 0.3V) to (V
DD
+ 0.3V)
Package Thermal Resistance (
JA
)
.............. 250
C/W
Operating Temperature Range .......... -40
C to +125
C
Storage Temperature ......................... -65
C to +150
C
*Stresses above those listed under "Absolute Maximum Rat-
ings" may cause permanent damage to the device. These are
stress ratings only and functional operation of the device at
these or any other conditions above those indicated in the
operation sections of the specifications is not implied. Expo-
sure to Absolute Maximum Rating conditions for extended
periods may affect device reliability.
TC650/TC651 ELECTRICAL SPECIFICATIONS
Note 1: Transition from 90% to 100% Duty Cycle.
Electrical Characteristics: V
DD
= 2.8V to 5.5V, SHDN = V
DD
, T
A
= -40
C to 125
C unless otherwise specified.
Symbol
Parameter
Min
Typ.
Max
Units
Test Conditions
V
DD
Supply Voltage
2.8
--
5.5
V
I
DD
Supply Current
--
50
90
A
PWM, T
OVER
are open
SHDN Input
V
IH
SHDN Input High Threshold
65
--
--
%V
DD
V
IL
SHDN Input Low Threshold
--
--
15
%V
DD
PWM Output
V
OL
PWM Output Low Voltage
--
--
0.3
V
I
SINK
= 1mA
V
OH
PWM Output High Voltage
V
DD
- 0.5
--
--
V
I
SOURCE
= 5mA
t
R
PWM Rise Time
--
10
--
sec
I
OH
= 5mA, 1nF from
PWM to GND
t
F
PWM Fall Time
--
10
--
sec
I
OL
= 1mA, 1nF from
PWM to GND
f
OUT
PWM Frequency
10
15
--
Hz
t
STARTUP
Start-up Time
--
32/f
OUT
--
sec
V
DD
Rises from GND,
or SHDN Released
Temperature Accuracy
T
H ACC
High Temperature Accuracy
T
H
3
T
H
T
H
+ 3
C
Note 1
(T
H
T
L
)
ACC
Temp. Range Accuracy
-1.0
--
+1.0
C
(T
H
- T
L
)
20
C
-2.5
--
+2.5
C
(T
H
- T
L
)
20
C
T
HYST
Auto-shutdown Hysteresis
--
(T
H
-T
L
)/5
--
C
TC651 Only
T
OVER
Output
V
HIGH
T
OVER
Output High Voltage
V
DD
- 0.5
--
--
V
I
SOURCE
= 1.2mA
V
LOW
T
OVER
Output Low Voltage
--
--
0.4
V
I
SINK
= 2.5mA
T
OVER ACC
Absolute Accuracy
--
T
H
+ 10
--
C
At Trip Point
T
OVER HYST
Trip Point Hysteresis
--
5
--
C
TC650/TC651
DS21450B-page 4
2002 Microchip Technology Inc.
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin No.
(8-Pin MSOP)
(8-Pin SOIC)
Symbol
Description
1
V
DD
Power Supply Input. May be independent of fan power supply.
2
NC
No Internal Connect.
3
SHDN
Fan Shutdown, Active-Low Input. During Shutdown mode the chip still monitors temper-
ature and T
OVER
is low if temperature rises above factory set point.
4
GND
Ground. Ground return for all TC650/TC651 functions.
5
NC
No Connect.
6
T
OVER
Over-Temperature Alert, Active-Low Output.
7
GND
Ground.
8
PWM
PWM Fan Drive Output. Pulse width modulated rail-to-rail logic output. Nominal
Frequency is 15Hz.
2002 Microchip Technology Inc.
DS21450B-page 5
TC650/TC651
3.0
DETAILED DESCRIPTION
The TC650/TC651 acquire and convert their junction
temperature (T
J
) information from an on-chip solid-state
sensor with a typical accuracy of 1C. The temperature
data is digitally stored in an internal register. The
register is compared with pre-defined threshold values.
The six threshold values are equally distributed over a
pre-defined range of temperatures (see Table 3-1 and
Table 3-2). The TC650/TC651 control the speed of a
DC brushless fan using a fractional speed control
scheme. The output stage requires only a 2N2222-type
small-signal BJT for fans up to 300mA. For larger
current fans (up to 1 Amp) a logic-level N-channel
MOSFET may be used. In addition to controlling the
speed of the fan, the TC650/TC651 include an on-chip
over-temperature alarm (T
OVER
) that gives a low signal
when the temperature of the chip exceeds T
H
by 10C,
(typical). This feature eliminates the need for a separate
temperature sensor for over-temperature monitoring.
TABLE 3-1:
TEMPERATURE RANGE
DEFINITION FOR TC650
(MINIMUM-SPEED MODE)
TABLE 3-2:
TEMPERATURE RANGE
DEFINITION FOR TC651
(AUTO-SHUTDOWN MODE)
FIGURE 3-1:
FUNCTIONAL BLOCK
DIAGRAM
3.1
PWM Output
The PWM pin is designed to drive a low cost transistor
or MOSFET as the low side power switching element in
the
system.
This
output
has
an
asymmetric
complementary drive and is optimized for driving NPN
transistors or N-channel MOSFETs. Since the system
relies on PWM rather than linear power control, the
dissipation in the power switch is kept to a minimum.
Generally,
very
small
devices
(TO-92
or
SOT
packages) will suffice. The frequency of the PWM is
about 15Hz. The PWM is also the time base for the
Start-up Timer (see paragraphs below). The PWM duty
cycle has a range of 40% to 100% for the TC650 and
50% to 100% for the TC651.
3.2
Start-Up Timer
To ensure reliable fan start-up, the Start-up Timer turns
PWM high for about 2 seconds whenever the fan is
started from the off state. This occurs at power-up and
when coming out of Shutdown mode.
3.3
Over-Temperature Alert (T
OVER
)
This pin goes low when the T
H
set point is exceeded by
10
o
C (typical). This indicates that the fan is at
maximum drive and the potential exists for system
overheating; either heat dissipation in the system has
gone beyond the cooling system's design limits, or
some FAULT exists such as fan bearing failure or an
airflow obstruction. This output may be treated as a
"System Overheat" warning and used to trigger system
shutdown, or bring other fans to full speed in the
system. The fan will continue to run at 100% speed
while T
OVER
is asserted. Built-in hysteresis prevents
T
OVER
from "chattering" when measured temperature
is at or near the T
H
+ 10C trip point. As temperature
falls through the T
H
+ 10C trip point, hysteresis
maintains the T
OVER
output low until measured
temperature is 5C above the trip point setting.
Temperature (T = T
J
)
PWM Duty Cycle
T < T
L
40%
T
L
< = T < T
1
50%
T
1
< = T < T
2
60%
T
2
< = T <T
3
70%
T
3
< = T < T
4
80%
T
4
< = T < T
H
90%
T
H
< = T < T
OV
100%
T
OV
< = T
100% with Over Temp Alert
(T
OVER
= L)
Temperature (T = T
J
)
PWM Duty Cycle
T < T
L
"OFF"
T
L
< = T < T
1
50%
T
1
< = T < T
2
60%
T
2
< =T < T
3
70%
T
3
< =T < T
4
80%
T
4
< = T < T
H
90%
T
H
< = T < T
OV
100%
T
OV
< = T
100% with Over-Temp Alert
(T
OVER
= L)
Note:The temperature regions defined by the six temperature thresh-
olds are pre-defined in the TC650/TC651 by means of trimming. Once
a T
L
and T
H
are programmed, the T
1
T
4
thresholds are automatically
equally spaced between T
L
and T
H
.
Temperature Sensor
Duty Cycle
Logic
Control
A/D Converter
Oscillator
Temperature
Set Point and
Trim Range
SHDN
T
OVER
PWM
V
DD
V+
TC650/TC651
DS21450B-page 6
2002 Microchip Technology Inc.
3.4
Shutdown (SHDN)
The fan can be unconditionally shutdown by pulling low
the SHDN pin. During shutdown, the PWM output is
low. This is ideal for notebook computers and other
portable applications when you need to change
batteries and must not have the fan running at that
time. Thermal monitoring and T
OVER
are still in
operation during shutdown. I
DD
shutdown current is
around 50
A.
3.5
Auto-Shutdown Mode
The
TC651
features
auto-shutdown;
when
the
temperature is below the factory set point at minimum
speed (T
L
), PWM is low and the fan is automatically
shut off (Auto-shutdown mode). This feature is ideal for
notebook computers and other portable equipment that
need to conserve as much battery power as possible
and thus run a fan when it is only absolutely needed.
The TC651 will continue to be active so as to monitor
temperature for Tover. The TC651 exits Auto-shutdown
mode when the temperature rises above the factory set
point (T
1
).
3.6
Temperature Selection Guide
(Minimum Fan Speed/Full Speed)
The five temperature regions defined by the six
thresholds are defined in the TC650/TC651 by means
of factory trimming. Once a T
L
and T
H
are set, the T
1
T
4
thresholds
are
automatically
equally
spaced
between T
L
and T
H
.
Note: The Bold Type temperature settings are available for
ordering. Contact factory for other temperature selec-
tions.
T
L
and T
H
can be selected in 5C increments. T
H
must
be chosen at least 10
o
C higher than T
L
. T
L
can range
anywhere from 25C to 35C.
As an example, suppose you wanted the fan to run at
40% speed at 25C or less and go to full speed at
45C. You would order the part number TC650AEVUA.
As another example, suppose you wanted the fan to
turn on at 30C and go to full speed at 45C. You
would order the part number TC651BEVUA.
Temp.
Range
T
L
T
H
Part #
10C
25
35
AC
30
40
BD
35
45
CE
15C
25
40
AD
30
45
BE
35
50
CF
20C
25
45
AE
30
50
BF
35
55
CG
30C
25
55
AG
2002 Microchip Technology Inc.
DS21450B-page 7
TC650/TC651
4.0
TYPICAL APPLICATIONS
4.1
Reducing Switching Noise
For fans consuming more than 300mA, a slowdown
capacitor (C
SLOW
) is recommended for reducing
switching PWM induced noise (see Figure 4-1). The
value of this capacitor should be 4.7
F to 47
F,
depending on the fan current consumption.
See Application Note AN771 "Suppressing Acoustic
Noise in PWM Fan Speed Control Systems" for more
information.
FIGURE 4-1:
REDUCING SWITCHING
NOISE
1
8
2
7
3
6
4
5
NC
V
DD
C
SLOW
PWM
GND
T
OVER
NC
GND
GND
+5V V
DD
+12V
TC650
TC651
SHDN
GND
Controller
DC Fan
500mA
SHDN Control Over-Temp.
Alert
TC650/TC651
DS21450B-page 8
2002 Microchip Technology Inc.
5.0
TYPICAL CHARACTERISTICS
The graphs and tables provided following this note are a statistical summary based on a limited number of samples
and are provided for informational purposes only. The performance characteristics listed herein are not tested or
guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., out-
side specified power supply range) and therefore outside the warranted range
90
80
70
60
50
40
30
20
10
0
-50
0
0
2
4
6
8
10 12 14 16 18 20
25
-25
50
75
100 125 150
TEMPERATURE (C)
I
DD
vs. Temperature
I
DD
(A)
3.0
2.5
2.0
1.5
1.0
0.5
0.0
T
L
T
1
T
2
T
3
T
4
T
H
T
THRESHOLD
Temperature Accuracy vs. V
TH
Temp Accuracy (
C)
V
DD
- V
OH
(V)
I
SOURCE
(mA)
PWM, I
SOURCE
vs. (V
DD
- V
OH
), T
A
= 25C
V
DD
= 2.8V
V
DD
= 5.5V
V
DD
= 2.7
V
DD
= 2.7
V
DD
=
5.6
V
DD
= 5.6
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0
1
2
3
4
5
6
7
8
9
10
V
OL
(mV)
I
SINK
(mA)
PWM, I
SINK
vs. V
OL
, T
A
= 25C
V
DD
= 2.8V
V
DD
= 5.5V
0.0
50
100
150
200
250
300
350
400
450
500
0
1
2
3
4
5
6
7
8
9
10
V
DD
- V
OH
(V)
I
SOURCE
(mA)
TOVER, ISOURCE vs. (VDD - VOH), TA = 25C
V
DD
= 2.8V
V
DD
= 5.5V
2002 Microchip Technology Inc.
DS21450B-page 9
TC650/TC651
6.0
PACKAGING INFORMATION
6.1
Package Marking Information
Package marking data not available at this time.
6.2
Taping Form
Component Taping Orientation for 8-Pin MSOP Devices
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
8-Pin MSOP
12 mm
8 mm
2500
13 in
Carrier Tape, Number of Components Per Reel and Reel Size
PIN 1
User Direction of Feed
Standard Reel Component Orientation
for TR Suffix Device
W
P
Component Taping Orientation for 8-Pin SOIC (Narrow) Devices
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
8-Pin SOIC (N)
12 mm
8 mm
2500
13 in
Carrier Tape, Number of Components Per Reel and Reel Size
Standard Reel Component Orientation
for TR Suffix Device
PIN 1
User Direction of Feed
P
W
TC650/TC651
DS21450B-page 10
2002 Microchip Technology Inc.
6.3
Package Dimensions
8-Pin MSOP
.122 (3.10)
.114 (2.90)
.122 (3.10)
.114 (2.90)
.043 (1.10)
MAX.
.006 (0.15)
.002 (0.05)
.016 (0.40)
.010 (0.25)
.197 (5.00)
.189 (4.80)
.008 (0.20)
.005 (0.13)
.028 (0.70)
.016 (0.40)
6
MAX.
.026 (0.65) TYP.
PIN 1
Dimensions: inches (mm)
.050 (1.27) TYP.
8
MAX.
PIN 1
.244 (6.20)
.228 (5.79)
.157 (3.99)
.150 (3.81)
.197 (5.00)
.189 (4.80)
.020 (0.51)
.013 (0.33)
.010 (0.25)
.004 (0.10)
.069 (1.75)
.053 (1.35)
.010 (0.25)
.007 (0.18)
.050 (1.27)
.016 (0.40)
.
8-Pin SOIC
Dimensions: inches (mm)
2002 Microchip Technology Inc.
DS21450B-page 11
TC650/TC651
SALES AND SUPPORT
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom-
mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1.
Your local Microchip sales office
2.
The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
3.
The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
New Customer Notification System
Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
TC650/TC651
DS21450B-page 12
2002 Microchip Technology Inc.
NOTES:
2002 Microchip Technology Inc.
DS21450B-page 13
TC650/TC651
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
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip's products as critical com-
ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con-
veyed, implicitly or otherwise, under any intellectual property
rights.
Trademarks
The Microchip name and logo, the Microchip logo, FilterLab,
K
EE
L
OQ
, microID,
MPLAB, PIC, PICmicro, PICMASTER,
PICSTART, PRO MATE, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip Tech-
nology Incorporated in the U.S.A. and other countries.
dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, microPort,
Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM,
MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode
and Total Endurance are trademarks of Microchip Technology
Incorporated in the U.S.A.
Serialized Quick Turn Programming (SQTP) is a service mark
of Microchip Technology Incorporated in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
2002, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received QS-9000 quality system
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and Mountain View, California in March 2002.
The Company's quality system processes and
procedures are QS-9000 compliant for its
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8-bit MCUs, K
EE
L
OQ
code hopping
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DS21450B-page 14
2002 Microchip Technology Inc.
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No. 317 Xian Xia Road
Shanghai, 200051
Tel: 86-21-6275-5700 Fax: 86-21-6275-5060
China - Shenzhen
Microchip Technology Consulting (Shanghai)
Co., Ltd., Shenzhen Liaison Office
Rm. 1315, 13/F, Shenzhen Kerry Centre,
Renminnan Lu
Shenzhen 518001, China
Tel: 86-755-2350361 Fax: 86-755-2366086
Hong Kong
Microchip Technology Hongkong Ltd.
Unit 901-6, Tower 2, Metroplaza
223 Hing Fong Road
Kwai Fong, N.T., Hong Kong
Tel: 852-2401-1200 Fax: 852-2401-3431
India
Microchip Technology Inc.
India Liaison Office
Divyasree Chambers
1 Floor, Wing A (A3/A4)
No. 11, O'Shaugnessey Road
Bangalore, 560 025, India
Tel: 91-80-2290061 Fax: 91-80-2290062
Japan
Microchip Technology Japan K.K.
Benex S-1 6F
3-18-20, Shinyokohama
Kohoku-Ku, Yokohama-shi
Kanagawa, 222-0033, Japan
Tel: 81-45-471- 6166 Fax: 81-45-471-6122
Korea
Microchip Technology Korea
168-1, Youngbo Bldg. 3 Floor
Samsung-Dong, Kangnam-Ku
Seoul, Korea 135-882
Tel: 82-2-554-7200 Fax: 82-2-558-5934
Singapore
Microchip Technology Singapore Pte Ltd.
200 Middle Road
#07-02 Prime Centre
Singapore, 188980
Tel: 65-6334-8870 Fax: 65-6334-8850
Taiwan
Microchip Technology Taiwan
11F-3, No. 207
Tung Hua North Road
Taipei, 105, Taiwan
Tel: 886-2-2717-7175 Fax: 886-2-2545-0139
EUROPE
Denmark
Microchip Technology Nordic ApS
Regus Business Centre
Lautrup hoj 1-3
Ballerup DK-2750 Denmark
Tel: 45 4420 9895 Fax: 45 4420 9910
France
Microchip Technology SARL
Parc d'Activite du Moulin de Massy
43 Rue du Saule Trapu
Batiment A - ler Etage
91300 Massy, France
Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79
Germany
Microchip Technology GmbH
Gustav-Heinemann Ring 125
D-81739 Munich, Germany
Tel: 49-89-627-144 0 Fax: 49-89-627-144-44
Italy
Microchip Technology SRL
Centro Direzionale Colleoni
Palazzo Taurus 1 V. Le Colleoni 1
20041 Agrate Brianza
Milan, Italy
Tel: 39-039-65791-1 Fax: 39-039-6899883
United Kingdom
Arizona Microchip Technology Ltd.
505 Eskdale Road
Winnersh Triangle
Wokingham
Berkshire, England RG41 5TU
Tel: 44 118 921 5869 Fax: 44-118 921-5820
03/01/02
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