TC652/TC653
Integrated Temperature Sensor & Brushless DC Fan
Controller with FanSense™ Detect & Over-Temperature
Features
Package Type
• 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: 50A (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
Part Number
Package
Temperature Range
TC652XXVUA
8-Pin MSOP
-40C to +125C
TC653XXVUA
8-Pin MSOP
-40C to +125C
X
Temperature
A
25
B
30
C
35
D
40
E
45
F
50
G
55
MSOP
VDD 1
FAULT 2
SHDN 3
8 PWM
TC652
TC653
GND 4
7 GND
6 TOVER
5 SENSE
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.
The "X" denotes a suffix for temperature threshold settings.
Contact factory for other temperature ranges.
2002-2012 Microchip Technology Inc.
DS21452C-page 1
TC652/TC653
Typical Application Diagram
+12V
DC Fan
300mA
Max.
TC652
TC653
+5V VDD
1k
1 VDD
PWM 8
2 FAULT
GND 7
3 SHDN
TOVER 6
4 GND
FanSense™
0.01µF
SENSE 5
CSENSE
GND
SHDN Control
Over-Temp
Alert
RSENSE
2Ω
Fan Fault Alert
µController
DS21452C-page 2
2002-2012 Microchip Technology Inc.
TC652/TC653
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Input Voltage (VDD to GND) ................................... +6V
*Stresses above those listed under "Absolute Maximum Ratings" 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. Exposure to Absolute Maximum Rating conditions for extended
periods may affect device reliability.
Output Voltage (OUT to GND) ................................. 6V
Voltage On Any Pin ....... (GND – 0.3V) to (VDD + 0.3V)
Package Thermal Resistance (JA ) ........... 250°C/W
Operating Temperature Range ......... -40°C to +125°C
Storage Temperature ......................... -65°C to +150°C
TC652/TC653 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: VDD = 2.8V to 5.5V, SHDN = VDD, TA = -40C to 125C unless otherwise specified.
Symbol
Parameter
Min
Typ.
Max
Units
VDD
Supply Voltage
2.8
—
5.5
V
IDD
Supply Current
—
50
90
A
VIH
SHDN Input High Threshold
65
—
—
%VDD
VIL
SHDN Input Low Threshold
—
—
15
%VDD
Test Conditions
PWM, FAULT, TOVER are
open
SHDN Input
PWM Output
VOL
PWM Output Low Voltage
—
—
0.3
V
VOH
PWM Output High Voltage
VDD – 0.5
—
—
V
tR
PWM Rise Time
—
10
—
sec
IOH = 5mA, 1nF from
PWM to GND
tF
PWM Fall Time
—
10
—
sec
IOL = 1mA, 1nF from
PWM to GND
ISINK = 1mA
ISOURCE = 5mA
fOUT
PWM Frequency
10
15
—
Hz
tSTARTUP
Start-up Time
—
32/fOUT
—
sec
VDD Rises from GND,
or SHDN Released
VTH (SENSE)
Sense Input
—
70
—
mV
Sense Input Threshold
Voltage with Repect to
Ground
TH - 3
TH
TH + 3
C
Note 1
-1.0
—
+1.0
C
-2.5
—
+2.5
C
(TH – TL) 20C
(TH – TL) 20C
—
(TH – TL)/5
—
C
TC653 Only
—
V
ISOURCE = 1.2mA
ISINK = 2.5mA
Temperature Accuracy
TH ACC
High Temperature Accuracy
(TH –TL) ACC
Temp. Range Accuracy
THYST
Auto-shutdown Hysteresis
FAULT Output
VHIGH
FAULT Output High Voltage
VDD – 0.5
—
VLOW
FAULT Output Low Voltage
—
—
0.4
V
tmp
Missing Pulse Detector
Time-out
—
—
32/fOUT
Sec
TOVER Output
VHIGH
TOVER Output High Voltage
VDD – 0.5
—
—
V
ISOURCE = 1.2mA
VLOW
TOVER Output Low Voltage
—
—
0.4
V
ISINK = 2.5mA
TOVER ACC
Absolute Accuracy
—
TH + 10
—
°C
At Trip Point
Trip Point Hysteresis
—
5
—
°C
TOVER HYST
Note
1:
Transition from 90% to 100% Duty Cycle.
2002-2012 Microchip Technology Inc.
DS21452C-page 3
TC652/TC653
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
Pin No.
(8-Pin MSOP)
PIN FUNCTION TABLE
Symbol
Description
1
VDD
2
FAULT
Power Supply Input. May be independent of fan power supply.
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 pin or cycling the VDD 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
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.
6
TOVER
Over-Temperature Alert, Active-Low Output.
Ground return for all TC652/TC653 functions.
7
GND
Ground.
8
PWM
PWM Fan Drive Output. Pulse width modulated rail-to-rail logic output. Nominal
Frequency is 15Hz.
DS21452C-page 4
2002-2012 Microchip Technology Inc.
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 TH by 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:
TABLE 3-2:
TEMPERATURE RANGE
DEFINITION FOR TC653
(AUTO-SHUTDOWN MODE)
Temperature
(T = TJ)
PWM Duty Cycle
T < TL
“OFF”
TL< = T < T1
50%
T 1 < = T < T2
60%
T2 < =T < T3
70%
T3 < =T < T4
80%
T 4 < = T < TH
90%
TH < = T < TOV
100%
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.
FIGURE 3-1:
VDD
V+
TOVER
Temperature
Set Point and
Trim Range
TEMPERATURE RANGE
DEFINITION FOR TC652
(MINIMUM-SPEED MODE)
FUNCTIONAL BLOCK
DIAGRAM
SHDN
Duty Cycle
Logic
Control
PWM
AD Converter
Oscillator
Temperature
(T = TJ)
PWM Duty Cycle
Temp Sensor
T < TL
40%
Fan Detect
Logic
TL< = T < T1
50%
T 1 < = T < T2
60%
T2 < = T
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