TC651CGVUART [MICROCHIP]
DIGITAL TEMP SENSOR-SINGLE TRIP POINT, MSOP-8;
| 型号： | TC651CGVUART |
| 厂家： | 
MICROCHIP |
| 描述： | DIGITAL TEMP SENSOR-SINGLE TRIP POINT, MSOP-8 输出元件 传感器 换能器 |
| 文件： | 总8页 (文件大小：57K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TC650
TC651
Tiny Integrated Temperature Sensor and Brushless DC Fan
Controller with Over Temperature Alert
GENERAL DESCRIPTION
FEATURES
The TC650/651 are integrated temperature sensors
and brushless DC fan speed controllers. The TC650/651
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 ther-
mal 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 tempera-
ture limits to control the fan. The TC650/651 also include a
single trip point over temperature alert (Tover) that elimi-
nates the need for additional temperature sensors. In addi-
tion, the TC651 features an auto fan shutdown function for
additional power savings.
I
Digital Temperature Sensing and Multi-Speed
Fan Control
I
I
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
1oC (Typical) Accuracy from 25oC to +70oC
2.8 - 5.5V Operating Range
I
I
I
I
I
I
TC651 includes Auto Fan Shutdown
Low Operating Power: 50µA (Typ)
The TC650/651 are easy to use, and require no soft-
ware overhead, and are therefore the ideal choice for
implementing thermal management in a variety of systems.
APPLICATIONS
I
I
I
I
I
I
Thermal Protection For Personal Computers
Digital Set-Top Boxes
Notebook Computers
Data Communications
Power Supplies
ORDERING INFORMATION
Part
Operating
Number
Package
Temp. Range
Projectors
TC650XXVUA
TC651XXVUA
8-Pin MSOP
8-Pin MSOP
– 40˚C to +125˚C
– 40˚C to +125˚C
RELATED LITERATURE
I
I
Application Note: 58
Article: "An Integrated Fan Speed Control Solu-
tion Can Lower System Costs, Reduce Acoustic
Noise and Power Consumption and Enhance
System Reliability"
X (See Page 5)
Temperature
A
B
C
D
E
F
25
30
35
40
45
50
55
TYPICAL APPLICATION
+12V
G
DC FAN
500mA
+5V VDD
Notes: 1. The "X" denotes a suffix for temperature threshold settings.
2. Contact factory for other temperature ranges.
V
8
PWM
GND
PIN CONFIGURATIONS
1
2
3
4
DD
TC650
TC651
NC
7
6
8-Pin MSOP
TOVER
SHDN
V
NC
GND
5
8
DD
1
2
3
4
PWM
GND
NC
7 GND
TC650
TC651
GND
6
TOVER
NC
SHDN
GND
SHDN CONTROL
OVER TEMP
ALERT
5
uController
TC650/1-2 3/05/01
© 2001 Microchip Technology Inc. DS21450A
Tiny Integrated Temperature Sensor
and Brushless DC Fan Controller
with Over Temperature Alert
TC650
TC651
ABSOLUTE MAXIMUM RATINGS*
Storage Temperature (unbiased) ..........–65oC to +150oC
Lead Temperature
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 )...................... 250oC/W
Operating Temperature Range ..............–40oC to +125oC
(Soldering, 10sec duration) ............................. +300oC
* This is a stress rating only and functional operation of the device at these
or any other conditions above those indicated in the operation section of
this specification is not implied. Exposure to absolute maximum ratings
conditions for extended periods of time may affect reliability.
ELECTRICAL CHARACTERISTICS: VDD = 2.8V to 5.5V, SHDN = VDD, TA = -40˚C to 125˚C unless otherwise specified.
Symbol Parameter
Test Conditions
Min
Typ
Max
Units
VDD
IDD
Supply Voltage
Supply Current
2.8
—
—
5.5
90
V
PWM Tover are open
50
µA
SHDN Input
VIH
VIL
SHDN Input High Threshold
SHDN Input Low Threshold
65
—
—
—
—
%VDD
%VDD
15
PWM Output
VOL
VOH
tR
PWM Output Low Voltage
ISINK = 1mA
—
—
—
0.3
—
—
—
—
—
V
V
PWM Output High Voltage
PWM Rise Time
PWM Fall Time
ISOURCE = 5mA
VDD – 0.5
IOH = 5mA, 1nF from PWM to GND
IOL = 1mA, 1nF from PWM to GND
—
—
10
—
10
µsec
µsec
Hz
tF
10
fOUT
tSTARTUP
PWM Frequency
Startup Time
15
VDD Rises from GND, or SHDN Released
32/fOUT
sec
Temperature Accuracy
TH ACC
High Temp Accuracy
Note 1
TH – 3
–1.0
–2.5
—
TH
—
TH + 3
+1.0
+2.5
—
°C
°C
(TH–TL)ACC Temp Range Accuracy
(TH – TL) ≤ 20°C
(TH – TL) > 20°C
TC651 Only
—
THYST
Auto Shutdown Hysteresis
(TH – TL)/5
°C
Tover Output
VHIGH
VLOW
Tover Output High Voltage
Tover Output Low Voltage
ISOURCE = 1.2mA
ISINK = 2.5mA
At Trip Point
VDD – 0.5
—
—
—
0.4
—
V
V
—
—
—
Tover ACC Absolute Accuracy
Tover HYST Trip Point Hysteresis
TH + 10
5
°C
°C
—
Notes:
1. Transition from 90% to 100% Duty Cycle.
© 2001 Microchip Technology Inc. DS21450A
2
TC650/1-2 03/05/01
Tiny Integrated Temperature Sensor
and Brushless DC Fan Controller
with Over Temperature Alert
TC650
TC651
PIN DESCRIPTION
Pin No.
Symbol
Description
8-Pin MSOP
1
2
3
VDD
NC
Power Supply Input. May be independent of fan power supply.
No Connect.
SHDN
Fan Shutdown, Active-Low Input. During shut down mode the chip still monitors
temperature and Tover is low if temperature rises above factory setpoint.
4
5
6
7
8
GND
NC
Ground. Ground return for all TC650/651 functions.
No Connect.
Tover
GND
PWM
Over-Temperature Alert, Active-Low Output.
Ground.
PWM Fan Drive Output. Pulse width modulated rail-to-rail logic output. Nominal
frequency is 15Hz.
BLOCK DIAGRAM
V+
VDD
SHDN
DUTY
CYCLE
LOGIC
TOVER
TEMPERATURE
SETPOINTAND
TRIMRANGE
PWM
CONTROL
ADCONVERTER
TEMP SENSOR
OSCILLATOR
2001 Microchip Technology Inc. DS21450A
TC650/1-2 03/05/01
3
Tiny Integrated Temperature Sensor
and Brushless DC Fan Controller
with Over Temperature Alert
TC650
TC651
FUNCTIONAL DESCRIPTION
DETAILED DESCRIPTION
PWM Output
The TC650/651 acquire, and convert, their junction
temperature (Tj) information from an on-chip solid state
sensor with a typical accuracy of 1oC (typical) . The
temperature data is digitally stored in an internal register.
Theregisteriscomparedwith pre-definedthresholdvalues.
The six threshold values are equally distributed over a pre-
defined range of temperatures (See Table 1). The TC650/
651 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.
Forlargercurrentfans (upto1Amp)alogic-levelN-channel
MOSFET may be used. In addition to controling the speed
of the fan, the TC650/651 include an on-chip over-tempera-
ture alarm (Tover) that gives a low-true signal when the
temperature of the chip exceeds TH by 10°C. This feature
eliminates the need for a separate temperature sensor for
over-temperature monitoring.
The PWM pin is designed to drive a low-cost transistor
or MOSFET as the low-side power-switching element in the
system. Various examples of driver circuits will be shown
below. 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 timebase 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.
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
fromtheoffstate. Thisoccursatpower-upandwhencoming
out of Shutdown Mode.
Table 1: Temperature Range Definition for TC650
(Minimum-Speed Mode)
Temperature (T=Tj)
PWM Duty Cycle
Over-Temperature Alert (Tover)
T<TL
40%
50%
60%
70%
80%
90%
100%
TL<=T<T1
T1<=T<T2
T2<=T<T3
T3<=T<T4
T4<=T<TH
TH<=T<TOV
This pin goes low when the TH set point is exceeded by
10oC. 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”whenmeasuredtemperatureisatorneartheTH
+ 10oC trip point. As temperature falls through the TH + 10oC
trip point, hysteresis maintains the Tover output low until
measured temperature is 5oC above the trip point setting.
TOV<=T
100% with over temp Alert (Tover = L)
Table 2: Temperature Range Definition for TC651
(Auto-Shutdown Mode)
Temperature (T=Tj)
PWM Duty Cycle
T<TL
“OFF”
50%
60%
70%
80%
90%
100%
TL<=T<T1
T1<=T<T2
T2<=T<T3
T3<=T<T4
T4<=T<TH
TH<=T<TOV
Shutdown (SHDN)
The fan can be unconditionally shutdown by pulling low
theSHDN pin. During shutdown, the PWM output is low. This
is ideal for notebook computer and other portable applica-
tions when you need to change batteries and must not have
thefanrunningatthetime. ThermalmonitoringandToverare
still in operation during shutdown. IDD shutdown current is
around 50µA.
TOV<=T
100% with over temp Alert (Tover = L)
Note: The temperature regions defined by the six temperature thresholds
are pre-defined in the TC650/651 by means of trimming. Once a TL and TH
are programmed, the T1 – T4 thresholds are automatically equally spaced
between TL and TH.
© 2001 Microchip Technology Inc. DS21450A
4
TC650/1-2 03/05/01
Tiny Integrated Temperature Sensor
and Brushless DC Fan Controller
with Over Temperature Alert
TC650
TC651
Auto-Shutdown Mode
APPLICATIONS INFORMATION
Reducing Switching Noise
The TC651 features auto shutdown: when the tempera-
ture is below the factory set point at minimum speed (TL),
PWM is low and the fan is automatically shut off (Auto-
Shutdownmode). Thisfeatureis idealfornotebookcomput-
ers 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 (T1).
For fans consuming more than 300mA, a slowdown
capacitor (CSLOW) is recommended for reducing switching
PWM induced noise (see Figure 1). The value of this
capacitor should be 4.7µF to 47µF, depending on the fan
current consumption. Please see Application Note 38 for
more information.
+12V
Temperature Selection Guide
(Minimum Fan Speed/Full Speed)
DC FAN
500mA
+5V VDD
The five temperature regions defined by the six thresh-
olds are defined in the TC650/651 by means of factory
trimming. Once a TL and TH are set, the T1 – T4 thresholds
are automatically equally spaced between TL and TH.
V
8
1
2
3
4
DD
PWM
GND
TC650
TC651
NC
7
6
TOVER
SHDN
Range
TL TH
Part #
NC
GND
5
10°C
25 35
30 40
35 45
AC
BD
CE
GND
GND
15°C
20°C
30°C
25 40
30 45
35 50
AD
BE
CF
SHDN CONTROL
OVER TEMP
ALERT
25 45
30 50
35 55
AE
BF
CG
uController
Figure 1. Reducing Switching Noise
25 55
AG
Note: The Bold Type temperature settings are available for
ordering. Contact factory for other temperature selections.
TL and TH can be selected in 5oC increments. TH must
be chosen at least 10oC higher than TL. TL can range
anywhere from 25oC to 35oC.
As an example, suppose you wanted the fan to run at
40% speed at 25oC or less and go to full speed at 45oC.
You would order the part number TC650AEVUA.
As another example, suppose you wanted the fan to
turn on at 30oC and go to full speed at 45oC. You would
order the part number TC651BEVUA.
2001 Microchip Technology Inc. DS21450A
TC650/1-2 03/05/01
5
Tiny Integrated Temperature Sensor
and Brushless DC Fan Controller
with Over Temperature Alert
TC650
TC651
TYPICAL CHARACTERISTIC CURVES
I
vs. Temperature
Temp Accuracy vs. V
TH
PWM, I
SOURCE
vs. (V - V ), T = 25°C
DD OH
DD
A
90
80
70
60
50
1.0
0.9
0.8
0.7
3.0
2.5
V
= 2.8V
DD
V
= 5.6V
2.0
1.5
DD
0.6
0.5
0.4
0.3
0.2
0.1
0.0
V
= 5.5V
DD
40
30
20
10
0
V
= 2.7V
DD
1.0
0.5
0.0
V
= 5.6V
DD
V
= 2.7V
DD
0
2
4
6
8
10
14
18 20
16
–50
12
–25
T
0
25 50 75 100 125 150
T
T
T
T
H
T
L
3
1
4
2
T
TEMPERATURE (°C)
I
(mA)
THRESHOLD
SOURCE
T
, I vs. (V - V ), T = 25°C
PWM, I
SINK
vs. V , T = 25°C
OVER SOURCE DD OH A
OL
A
1.0
0.9
0.8
0.7
500
450
400
350
V
= 2.8V
DD
V
= 2.8V
DD
0.6
0.5
0.4
0.3
0.2
0.1
0.0
300
250
200
150
100
50
V
= 5.5V
V
= 5.5V
DD
DD
0
8
1
2
3
4
5
6
7
9
10
0
8
1
2
3
4
5
6
7
9
10
0
I
(mA)
I
(mA)
SOURCE
SINK
© 2001 Microchip Technology Inc. DS21450A
6
TC650/1-2 03/05/01
Tiny Integrated Temperature Sensor
and Brushless DC Fan Controller
with Over Temperature Alert
TC650
TC651
TAPE AND REEL DIAGRAM
Component Taping Orientation for 8-Pin MSOP Devices
User Direction of Feed
User Direction of Feed
PIN 1
W
PIN 1
P
Standard Reel Component Orientation
for TR Suffix Device
Reverse Reel Component Orientation
for RT Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
8-Pin MSOP
12 mm
8 mm
2500
13 in
PACKAGE DIMENSIONS
8-Pin MSOP
PIN 1
.197 (5.00)
.189 (4.80)
.122 (3.10)
.114 (2.90)
.026 (0.65) TYP.
.122 (3.10)
.114 (2.90)
.043 (1.10)
MAX.
.008 (0.20)
.005 (0.13)
6° MAX.
.016 (0.40)
.010 (0.25)
.006 (0.15)
.002 (0.05)
.028 (0.70)
.016 (0.40)
Dimensions: inches (mm)
2001 Microchip Technology Inc. DS21450A
TC650/1-2 03/05/01
7
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SALES AND
S
ERVICE
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Hauppauge, NY 11788
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Tel: 480-792-7200 Fax: 480-792-7277
Technical Support: 480-792-7627
Web Address: http://www.microchip.com
ASIA/PACIFIC (continued)
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01/09/01
All rights reserved.
©
2001 Microchip Technology Incorporated. Printed in the USA. 1/01
Printed on recycled paper.
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 Microchipís products as critical components in life support systems is not authorized except with
express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, except as maybe explicitly expressed herein, under any intellec-
tual property rights. The Microchip logo and name are registered trademarks of Microchip Technology Inc. in the U.S.A. and other countries. All rights
reserved. All other trademarks mentioned herein are the property of their respective companies.
© 2001 Microchip Technology Inc. DS21450A
8
TC650/1-2 03/05/01
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