TC652/TC653
Integrated Temperature Sensor & Brushless DC Fan
Controller with FanSense鈩?Detect & Over-Temperature
Features
鈥?Integrated Temperature Sensing and Multi-speed
Fan Control
鈥?FanSense鈩?Fan Fault Detect Circuitry
鈥?Built-in Over-Temperature Alert (T
OVER
)
鈥?Temperature Proportional Fan Speed Control for
Acoustic Noise Reduction and Longer Fan Life
鈥?Pulse Width Modulation Output Drive for Cost
and Power Savings
鈥?Solid-State Temperature Sensing
鈥?鹵1擄C (Typical) Accuracy from 25擄C to +70擄C
鈥?2.8V 鈥?5.5V Operating Range
鈥?TC653 includes Auto Fan Shutdown
鈥?Low Operating Current: 50碌A(chǔ) (Typical)
Package Type
MSOP
V
DD
1
FAULT 2
SHDN 3
GND 4
8 PWM
TC652
TC653
7 GND
6 T
OVER
5 SENSE
General Description
The TC652/TC653 are integrated temperature sensors
and brushless DC fan speed controllers with
FanSense
鈩?/div>
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
鈩?/div>
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 (T
OVER
) 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.
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Thermal Protection For Personal Computers
Digital Set-Top Boxes
Notebook Computers
Data Communications
Power Supplies
Projectors
Related Literature
鈥?Application Note: AN771
Device Selection Table
Part Number
TC652XXVUA
TC653XXVUA
Package
8-Pin MSOP
8-Pin MSOP
Temperature Range
-40擄C to +125擄C
-40擄C to +125擄C
X
A
B
C
D
E
F
G
Temperature
25
30
35
40
45
50
55
The "X" denotes a suffix for temperature threshold settings.
Contact factory for other temperature ranges.
2002 Microchip Technology Inc.
DS21453B-page 1
漏
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