2002 Microchip Technology Inc. DS21453B-page 1
TC652/TC653
Features
• Integrated Temperature Sensing and Multi-speed
Fan Control
• FanSense™ Fan Fault Detect Circuitry
• Built-in Over-Temperature Alert (TOVER)
• 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
• TC653 includes Auto Fan Shutdown
• Low Operating Current: 50µA(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 TC652/TC653 are integrated temperature sensors
and brushless DC fan speed controllers with
FanSense™technology. The TC652/TC653 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.
The FanSense™Fan Fault detect circuitry eliminates
the need for a more expensive 3-wire fan.
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
TC652/TC653 also include a single trip point over
temperature alert (TOVER) that eliminates the need for
additional temperature sensors. In addition, the TC653
includes an auto fan shutdown function for additional
power savings.
The TC652/TC653 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
TC652XXVUA 8-Pin MSOP -40°Cto+125°C
TC653XXVUA 8-PinMSOP -40°Cto+125°C
XTemperature
A25
B30
C35
D40
E45
F50
G55
18
2
7
36
4
5
FAULT
VDD
MSOP
GND
PWM
TOVER
SENSE
GND
TC652
TC653
SHDN
Integrated Temperature Sensor & Brushless DC Fan
Controller with FanSense™ Detect & Over-Temperature
TC652/TC653
DS21453B-page 2
2002 Microchip Technology Inc.
Typical Application Diagram
18
2
7
36
4
5
FAULT
VDD PWM
GND
TOVER
SENSE
RSENSE
FanSense™
GND
GND
+5V VDD
+12V
TC652
TC653
SHDN
2Ω
1k
0.01µF
CSENSE
µController
DC Fan
300mA
Max.
SHDN Control Over-Temp
Alert
Fan Fault Alert
2002 Microchip Technology Inc. DS21453B-page 3
TC652/TC653
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Input Voltage (VDD to GND)...................................+6V
Output Voltage (OUT to GND) .................................6V
Voltage On Any Pin.......(GND – 0.3V) to (VDD +0.3V)
Package Thermal Resistance (θJA ) ...........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.
TC652/TC653 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: VDD = 2.8V to 5.5V, SHDN =V
DD,T
A=-40°Cto125°C unless otherwise specified.
Symbol Parameter Min Typ. Max Units Test Conditions
VDD Supply Voltage 2.8 — 5.5 V
IDD Supply Current — 50 90 µAPWM,FAULT,T
OVER are
open
SHDN Input
VIH SHDN Input High Threshold 65 — — %VDD
VIL SHDN Input Low Threshold — — 15 %VDD
PWM Output
VOL PWM Output Low Voltage — — 0.3 V ISINK =1mA
VOH PWM Output High Voltage VDD –0.5 — — V I
SOURCE =5mA
tRPWM Rise Time — 10 — µsec IOH =5mA,1nFfrom
PWM to GND
tFPWM Fall Time — 10 — µsec IOL =1mA,1nFfrom
PWM to GND
fOUT PWM Frequency 10 15 — Hz
tSTARTUP Start-up Time — 32/fOUT —secV
DD Rises from GND,
or SHDN Released
VTH (SENSE) Sense Input — 70 — mV Sense Input Threshold
Voltage with Repect to
Ground
Temperature Accuracy
TH ACC High Temperature Accuracy TH-3 T
HTH+3 °CNote 1
(TH –TL) 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
THYST Auto-shutdown Hysteresis — (TH–T
L)/5 — °CTC653Only
FAULT Output
VHIGH FAULT Output High Voltage VDD –0.5 — — V I
SOURCE =1.2mA
VLOW FAULT Output Low Voltage — — 0.4 V ISINK =2.5mA
tmp Missing Pulse Detector
Time-out ——32/f
OUT Sec
TOVER Output
VHIGH TOVER Output High Voltage VDD –0.5 — — V I
SOURCE =1.2mA
VLOW TOVER Output Low Voltage — — 0.4 V ISINK =2.5mA
TOVER ACC Absolute Accuracy — TH+ 10 — °C At Trip Point
TOVER HYST Trip Point Hysteresis — 5 — °C
Note 1: Transition from 90% to 100% Duty Cycle.
TC652/TC653
DS21453B-page 4
2002 Microchip Technology Inc.
2.0 PIN DESCRIPTIONS
ThedescriptionsofthepinsarelistedinTable2-1.
TABLE 2-1: PIN FUNCTION TABLE
Pin No.
(8-Pin MSOP) Symbol Description
1V
DD Power Supply Input. May be independent of fan power supply.
2FAULT
Fan Fault Alert, Active-Low Output. FAULT goes low to indicate a fan FAULT condition.
When FAULT occurs, the device is latched in Shutdown mode with PWM low. Toggling
the SHDN pinorcyclingtheV
DD will release the part and fan from shutdown. FAULT will
unconditionally remain high during shutdown.
3 SHDN Fan Shutdown, Active-Low Input. During Shutdown mode the chip still monitors
temperature and TOVER is low if temperature rises above factory set point.
4 GND Ground return for all TC652/TC653 functions.
5 SENSE Detect Fan Pulses Input. Pulses are detected at this pin as fan rotation chops the current
through the sense resistor, RSENSE. The absence of pulses indicates a Fan Fault.
6T
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. DS21453B-page 5
TC652/TC653
3.0 DETAILED DESCRIPTION
The TC652/TC653 acquire and convert their junction
temperature (TJ) information from an on-chip solid
state sensor with a typical accuracy of ±1°C. 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 TC652/TC653
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 TC652/
TC653 include an on-chip over-temperature alarm
(TOVER) that gives a low-true signal when the
temperature of the chip exceeds THby 10°C. This
feature eliminates the need for a separate temperature
sensor for over-temperature monitoring.
In normal fan operation, a pulse-train is present at
SENSE, Pin 5. A Missing Pulse Detector monitors this
pin during fan operation (FanSense™technology). A
stalled, open, or unconnected fan causes the TC652/
TC653 to trigger its Start-up Timer once. If the FAULT
persists, the FAULT output goes low, and the device is
latched in its Shutdown mode. To release the fan from
shutdown, toggle the SHDN or VDD pin.
TABLE 3-1: TEMPERATURE RANGE
DEFINITION FOR TC652
(MINIMUM-SPEED MODE)
TABLE 3-2: TEMPERATURE RANGE
DEFINITION FOR TC653
(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 TC652 and
50% to 100% for the TC653.
Temperature
(T = TJ)PWM Duty Cycle
T<T
L40%
TL<=T<T
150%
T1<=T<T
260%
T2<=T<T
370%
T3<=T<T
480%
T4<=T<T
H90%
TH<=T<T
OV 100%
TOV < = T 100% with Over-Temp Alert
(TOVER =L)
Temperature
(T = TJ)PWM Duty Cycle
T<T
L“OFF”
TL<=T<T
150%
T1<=T<T
260%
T2<=T<T
370%
T3<=T<T
480%
T4<=T<T
H90%
TH<=T<T
OV 100%
TOV <=T 100%withOver-TempAlert
(TOVER =L)
Note: The temperature regions defined by the six tempera-
ture thresholds are pre-defined in the TC650/651 by means
of trimming. Once a TLand THare programmed, the T1-T
4
thresholds are automatically equally spaced between TLand
TH.
Temp Sensor
Fan Detect
Logic
Duty Cycle
Logic
Control
AD Converter
Oscillator
Temperature
Set Point and
Trim Range
SHDN
T
OVER
PWM
FAULT
90mV
V
DD
V+
CMPTR
+
-
20k
-
-
TC652/TC653
DS21453B-page 6
2002 Microchip Technology Inc.
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 SENSE Input
(FanSense™ Technology)
The SENSE input, Pin 5, is connected to a low value
current sensing resistor in the ground return leg of the
fan circuit through the capacitor. During normal fan
operation, commutation occurs as each pole of the fan
is energized. This causes brief interruptions in the fan
current, seen as pulses across thesense resistor. If the
device is not in Shutdown mode, and pulses are not
appearing at the SENSE input, a FAULT exists. The
short, rapid change in fan current (high di/dt) causes a
corresponding dv/dt across the sense resistor, RSENSE.
The waveform on RSENSE is differentiated and con-
verted to a logic-level pulse-train by CSENSE and the
internal signal processing circuitry. The presence and
frequency of this pulse-train is a direct indication of fan
operation.
3.4 FAULT
This pin goes low to indicate a fan FAULT condition.
Pulses appearing at SENSE pin due to the PWM turn-
ing on are blanked and the remaining pulses are
filtered by a Missing Pulse Detector. If consecutive
pulses are not detected for 32 PWM cycles (about 2
sec), the PWM is Low and FAULT goes low. FAULT can
be disabled by momentarily toggling SHDNor VDD pin,
or cycling system power. FAULT remains high during
Shutdown mode.
3.5 Over-Temperature Alert (TOVER)
This pin goes low when the THset point is exceeded
by 10°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 TOVER is asserted. Built-in hysteresis prevents
TOVER from “chattering” when measured temperature
is at or near the TH+ 10°C trip point. As temperature
falls through the TH+ 10°C trip point, hysteresis
maintains the TOVER output low until measured
temperature is 5°C above the trip point setting.
3.6 Shutdown (SHDN)
The fancan be unconditionally shutdown bypullinglow
the SHDN pin. During shutdown, FAULT output is high
and 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 TOVER are
stillin operation during shutdown. IDD shutdown current
is around 50µA.
3.7 Auto-Shutdown Mode
The TC653 has auto-shutdown. If the temperature is
below the factory set point at minimum speed (TL),
PWM is low and the fan is automatically shut off (Auto-
shutdown mode). This feature is ideal for notebook
computers and other portable applications that need to
conserve as much battery power as possible and thus
run a fan when it is only absolutely needed. The TC653
will continue to be active so as to monitor temperature
for TOVER. The TC653 exits Auto-shutdown mode
when the temperature rises above the factory set point
(T1).
3.8 Temperature Selection Guide
(Minimum Fan Speed/Full Speed)
The five temperature regions defined by the six
thresholds are defined in the TC652/TC653 by means
of factory trimming. Once a TLand THare set, the T1–
T4thresholds are automatically equally spaced
between TLand TH.
2002 Microchip Technology Inc. DS21453B-page 7
TC652/TC653
TABLE 3-3: TEMPERATURE SELECTION
GUIDE
Note: The Bold Type temperature settings are available for ordering.
Contact factory for other temperature selections.
TLand THcanbeselectedin5°Cincrements.T
Hmust
be chosen at least 10°C higher than TL.T
Lcan range
anywhere from 25°C to 35°C.
As an example, suppose you wanted the fan to run at
40% speed at 25°C or less and go to full speed at
45°C. You would orderthe part number TC652AEVUA.
As another example, suppose you wanted the fan to
turn on at 30°C and go to full speed at 45°C. You
would order the part number TC653BEVUA.
4.0 TYPICAL APPLICATIONS
4.1 Reducing Switching Noise
For fans consuming more than 300mA, a slowdown
capacitor (CSLOW) is recommended for reducing
switching PWM induced noise (see Figure 4-1). The
value of this capacitor should be 4.7µFto47µF,
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
Temp.
Range °C TLTHPart #
10°C 25 35 AC
30 40 BD
35 45 CE
15°C 25 40 AD
30 45 BE
20°C 25 45 AE
30 50 BF
35 55 CG
30°C 25 55 AG
18
2
7
36
4
5
VDD PWM
GND
TOVER
NC
GND
GND
+5V VDD
CSENSE
CSLOW
0.01µF
10µF
RSENSE
2Ω
1kΩ
+12V
TC652
TC653
SHDN
FAULT
GND
µController
DC Fan
400mA
Max.
SHDN Control
Fan Fault Alert
Over-Temp
Alert
-
TC652/TC653
DS21453B-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., outside
specified power supply range) and therefore outside the warranted range.
90
80
70
60
50
40
30
20
10
0-50 0024 6 810
12 14 16 18 20
25
-25 50 75 100 125 150
TEMPERATURE (˚C)
IDD vs. Temperature
IDD (µA)
3.0
2.5
2.0
1.5
1.0
0.5
0.0
TLT1T2T3T4TH
TTHRESHOLD
Temp Accuracy vs. VTH
TEMP ACCURACY (˚C)
VDD – VOH (V)
ISOURCE (mA)
PWM, ISOURCE vs. (VDD - VOH), TA = 25˚
C
V
DD
= 2.8V
V
DD
= 5.5V
V
DD
=
2.7V
V
DD
=
5.6V
V
DD
=
5.6V
V
DD
=
2.7V
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
0123 4 5678910
VOL (mV)
ISINK (mA)
PWM, I
SINK
vs. V
OL
, T
A
= 25˚C
V
DD
= 2.8V
V
DD
= 5.5V
0
50
100
150
200
250
300
350
400
450
500
VDD – VOH (V)
ISOURCE (mA)
T
OVER
, I
SOURCE
vs. (V
DD
- V
OH
), T
A
= 25˚C
V
DD
= 2.8V
V
DD
= 5.5V
0123 4 5678910 0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
VDD – VOH (V)
ISOURCE (mA)
FAULT, I
SOURCE
vs. (V
DD
- V
OH
), T
A
= 25˚
C
V
DD
= 2.8V
V
DD
= 5.5V
0123 4 5678910
0123 4 5678910 1.0 1.5 2.0 2.5 3.0 3.5 4.0 5.04.50.5
5.0
5.0
5.0
0.0
0.0
0.0
VOL (mV)
ISINK (mA) 500msec/Div
FAULT, ISINK vs. VOL, TA = 25˚C
VDD = 2.8V
VDD = 5.5V
0
50
100
150
200
250
300
350
400
450
500
TC652/3, Fan is Running
SHDN is Connected to VDD, TA = 25˚C
Start-Up Time
0
VDD
PWM
FAULT
23 4 5678 1091
5.0
5.0
5.0
0.0
0.0
0.0
1sec/Div
TC653, Fan is Not Running
SHDN is Connected to VDD, TA = 25˚C
0
VDD
PWM
FAULT
2002 Microchip Technology Inc. DS21453B-page 9
TC652/TC653
6.0 PACKAGING INFORMATION
6.1 Package Marking Information
Package marking data not available at this time.
6.2 Taping Form
6.3 Package Dimensions
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
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)
TC652/TC653
DS21453B-page 10
2002 Microchip Technology Inc.
NOTES:
2002 Microchip Technology Inc. DS21453B-page 11
TC652/TC653
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.
TC652/TC653
DS21453B-page 12
2002 Microchip Technology Inc.
NOTES:
2002 Microchip Technology Inc. DS21453B-page 13
TC652/TC653
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,
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PICSTART, PRO MATE, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip Tech-
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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
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Serialized Quick Turn Programming (SQTP) is a service mark
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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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The Company’s quality system processes and
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DS21453B-page 14
2002 Microchip Technology Inc.
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Renminnan Lu
Shenzhen 518001, China
Tel: 86-755-2350361 Fax: 86-755-2366086
China - Hong Kong SAR
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
Microchip Ltd.
505 Eskdale Road
Winnersh Triangle
Wokingham
Berkshire, England RG41 5TU
Tel: 44 118 921 5869 Fax: 44-118 921-5820
04/20/02
WORLDWIDE SALES AND SERVICE
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