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TC652/TC653
Integrated Temperature Sensor & Brushless DC Fan Controller with FanSenseTM Detect & Over-Temperature
Features
* Integrated Temperature Sensing and Multi-speed Fan Control * FanSenseTM 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 * 1C (Typical) Accuracy from 25C to +70C * 2.8V - 5.5V Operating Range * TC653 includes Auto Fan Shutdown * Low Operating Current: 50A (Typical)
Package Type
MSOP
VDD 1 FAULT 2 SHDN 3 GND 4 8 PWM
TC652 TC653
7 GND 6 TOVER 5 SENSE
General Description
The TC652/TC653 are integrated temperature sensors and brushless DC fan speed controllers with FanSenseTM 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 FanSenseTM 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.
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 TC652XXVUA TC653XXVUA Package 8-Pin MSOP 8-Pin MSOP Temperature Range -40C to +125C -40C to +125C
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.
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TC652/TC653
Typical Application Diagram
+12V DC Fan 300mA Max. 1k 1 VDD 2 FAULT 3 SHDN 4 GND PWM 8 GND 7 TOVER 6 SENSE 5 CSENSE GND SHDN Control Fan Fault Alert Controller Over-Temp Alert RSENSE 2 FanSenseTM 0.01F
+5V VDD
TC652 TC653
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TC652/TC653
1.0 ELECTRICAL CHARACTERISTICS
*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.
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 (JA ) ........... 250C/W Operating Temperature Range ......... -40C to +125C Storage Temperature ......................... -65C to +150C
TC652/TC653 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: VDD = 2.8V to 5.5V, SHDN = VDD, TA = -40C to 125C unless otherwise specified. Symbol VDD IDD SHDN Input VIH VIL PWM Output VOL VOH tR tF fOUT tSTARTUP VTH (SENSE) PWM Output Low Voltage PWM Output High Voltage PWM Rise Time PWM Fall Time PWM Frequency Start-up Time Sense Input -- VDD - 0.5 -- -- 10 -- -- -- -- 10 10 15 32/fOUT 70 0.3 -- -- -- -- -- -- V V sec sec Hz sec mV VDD Rises from GND, or SHDN Released Sense Input Threshold Voltage with Repect to Ground ISINK = 1mA ISOURCE = 5mA IOH = 5mA, 1nF from PWM to GND IOL = 1mA, 1nF from PWM to GND SHDN Input High Threshold SHDN Input Low Threshold 65 -- -- -- -- 15 %VDD %VDD Parameter Supply Voltage Supply Current Min 2.8 -- Typ. -- 50 Max 5.5 90 Units V A PWM, FAULT, TOVER are open Test Conditions
Temperature Accuracy TH ACC (TH -TL) ACC THYST FAULT Output VHIGH VLOW tmp TOVER Output VHIGH VLOW TOVER
Note
ACC
High Temperature Accuracy Temp. Range Accuracy Auto-shutdown Hysteresis
TH - 3 -1.0 -2.5 --
TH -- -- (TH - TL)/5
TH + 3 +1.0 +2.5 --
C C C C
Note 1 (TH - TL) 20C (TH - TL) 20C TC653 Only
FAULT Output High Voltage FAULT Output Low Voltage Missing Pulse Detector Time-out
VDD - 0.5 -- --
-- -- --
-- 0.4 32/fOUT
V V Sec
ISOURCE = 1.2mA ISINK = 2.5mA
TOVER Output High Voltage TOVER Output Low Voltage Absolute Accuracy Trip Point Hysteresis
Transition from 90% to 100% Duty Cycle.
VDD - 0.5 -- -- --
-- -- TH + 10 5
-- 0.4 -- --
V V C C
ISOURCE = 1.2mA ISINK = 2.5mA At Trip Point
TOVER HYST
1:
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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) 1 2
PIN FUNCTION TABLE
Symbol VDD FAULT Description 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. Fan Shutdown, Active-Low Input. During Shutdown mode the chip still monitors temperature and TOVER is low if temperature rises above factory set point. Ground return for all TC652/TC653 functions. 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. Over-Temperature Alert, Active-Low Output. Ground. PWM Fan Drive Output. Pulse width modulated rail-to-rail logic output. Nominal Frequency is 15Hz.
3 4 5 6 7 8
SHDN GND SENSE TOVER GND PWM
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3.0 DETAILED DESCRIPTION
TABLE 3-2:
The TC652/TC653 acquire and convert their junction temperature (TJ) 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 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 10C. 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 (FanSenseTM 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.
TEMPERATURE RANGE DEFINITION FOR TC653 (AUTO-SHUTDOWN MODE)
PWM Duty Cycle "OFF" 50% 60% 70% 80% 90% 100% 100% with Over-Temp Alert (TOVER = L)
Temperature (T = TJ) T < TL TL< = T < T1 T1 < = T < T2 T2 < =T < T3 T3 < =T < T4 T4 < = T < TH TH < = T < TOV TOV < = T
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
FUNCTIONAL BLOCK DIAGRAM
TOVER V+ SHDN Duty Cycle Logic Control
Temperature Set Point and Trim Range
PWM
TABLE 3-1:
TEMPERATURE RANGE DEFINITION FOR TC652 (MINIMUM-SPEED MODE)
PWM Duty Cycle 40% 50% 60% 70% 80% 90% 100% 100% with Over-Temp Alert (TOVER = L)
AD Converter Oscillator
Temperature (T = TJ) T < TL TL< = T < T1 T1 < = T < T2 T2 < = T Temp Sensor Fan Detect Logic FAULT + CMPTR 90mV
20k -
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.
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TC652/TC653
3.2 Start-Up Timer 3.6 Shutdown (SHDN)
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. The fan can be unconditionally shutdown by pulling low 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 still in operation during shutdown. IDD shutdown current is around 50A.
3.3
SENSE Input (FanSenseTM 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 the sense 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, R SENSE. The waveform on RSENSE is differentiated and converted 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.
3.7
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 (Autoshutdown 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
3.4
FAULT
Temperature Selection Guide (Minimum Fan Speed/Full Speed)
This pin goes low to indicate a fan FAULT condition. Pulses appearing at SENSE pin due to the PWM turning 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 SHDN or VDD pin, or cycling system power. FAULT remains high during Shutdown mode.
The five temperature regions defined by the six thresholds are defined in the TC652/TC653 by means of factory trimming. Once a TL and T H are set, the T1 - T4 thresholds are automatically equally spaced between TL and TH.
3.5
Over-Temperature Alert (TOVER)
This pin goes low when the TH set point is exceeded by 10C (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 T H + 10C trip point. As temperature falls through the TH + 10C trip point, hysteresis maintains the TOVER output low until measured temperature is 5C above the trip point setting.
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TC652/TC653
TABLE 3-3: TEMPERATURE SELECTION GUIDE
TL 25 30 35 15C 20C 25 30 25 30 35 30C 25 TH 35 40 45 40 45 45 50 55 55 Part # AC BD CE AD BE AE BF CG AG
4.0
4.1
TYPICAL APPLICATIONS
Reducing Switching Noise
Temp. Range C 10C
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 4.7F to 47F, 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
+12V DC Fan 400mA Max.
Note: The Bold Type temperature settings are available for ordering. Contact factory for other temperature selections.
TL and TH can be selected in 5C increments. TH must be chosen at least 10C higher than TL. TL 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 TC652AEVUA. 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 TC653BEVUA.
+5V VDD
TC652 TC653
1k 1 VDD 2 FAULT 3 SHDN 4 GND PWM 8 GND 7 TOVER 6 NC 5 CSENSE 10F CSLOW 0.01F
-
GND SHDN Control Fan Fault Alert Over-Temp Alert GND
RSENSE 2
Controller
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TC652/TC653
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.
IDD vs. Temperature
90
Temp Accuracy vs. VTH
3.0 2.5
PWM, ISOURCE vs. (VDD - VOH), TA = 25C
1.0
80
TEMP ACCURACY (C)
0.9
0.8
VDD - VOH (V)
70
IDD (A)
60 50 40 30 20 10
VDD = 5.6V
2.0 1.5 1.0 0.5 0.0 VDD = 5.6V VDD = 2.7V TL T1 T3 T2 TTHRESHOLD T4 TH
0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 0 2
VDD = 2.8V VDD = 5.5V
VDD = 2.7V
0
-50 -25
0 25 50 75 100 125 150 TEMPERATURE (C)
4
6
8 10 12 14 16 18 20 ISOURCE (mA)
PWM, ISINK vs. VOL, TA = 25C
500 450 400
TOVER, ISOURCE vs. (VDD - VOH), TA = 25C
1.0 0.9 0.8 VDD - VOH (V) VDD = 2.8V VDD - VOH (V)
FAULT, ISOURCE vs. (VDD - VOH), TA = 25C
1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 VDD = 5.5V VDD = 2.8V
350 VOL (mV) 300 250 200 150 100 50 0 0 1
VDD = 2.8V VDD = 5.5V
0.7 0.6 0.5 0.4 0.3 0.2 0.1 VDD = 5.5V
2
3
4567 ISINK (mA)
8
9
10
0.0
0
1
2
3
4567 ISOURCE (mA)
8
9
10
0.0
0
1
2
3
4567 ISOURCE (mA)
8
9
10
FAULT, ISINK vs. VOL, TA = 25C
500 450 400 350 VOL (mV) 300 250 200 150 100 50 0 0 1 2 3 4567 ISINK (mA) 8 9 10 VDD = 5.5V VDD = 2.8V
TC652/3, Fan is Running SHDN is Connected to VDD, TA = 25C
5.0 VDD 0.0 Start-Up Time 5.0 PWM 0.0 5.0 FAULT 0.0
TC653, Fan is Not Running SHDN is Connected to VDD, TA = 25C
5.0
VDD 0.0 5.0 PWM 0.0 5.0 FAULT 0.0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
500msec/Div
01
2
3
4
567 1sec/Div
8
9
10
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TC652/TC653
6.0
6.1
PACKAGING INFORMATION
Package Marking Information
Package marking data not available at this time.
6.2
Taping Form
Component Taping Orientation for 8-Pin MSOP Devices
User Direction of Feed
PIN 1
W
P Standard Reel Component Orientation for TR 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
6.3
Package Dimensions
8-Pin MSOP
PIN 1
.122 (3.10) .114 (2.90)
.197 (5.00) .189 (4.80)
.026 (0.65) TYP.
.122 (3.10) .114 (2.90) .043 (1.10) MAX. .016 (0.40) .010 (0.25) .006 (0.15) .002 (0.05)
6 MAX. .028 (0.70) .016 (0.40)
.008 (0.20) .005 (0.13)
Dimensions: inches (mm)
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TC652/TC653
NOTES:
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TC652/TC653
SALES AND SUPPORT
Data Sheets Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following: 1. 2. 3. Your local Microchip sales office The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277 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.
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NOTES:
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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 components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property rights.
Trademarks The Microchip name and logo, the Microchip logo, FilterLab, KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER, PICSTART, PRO MATE, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology 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. (c) 2002, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved.
Printed on recycled paper.
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2002 Microchip Technology Inc.
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*B35412SD*

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