TC651 MICROCHIP | Alldatasheet
Document overview
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Technical content
Features
- Integrated Temperature Sensing and Multi-speed Fan Control Built-in Over Temperature Alert (T OVER) T emperature 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°Ct o+ 7 0°C 2.8V – 5.5V Operating Range TC651 includes Auto Fan Shutdown Low Operating Current: 50 µA( T y p i c a l )
Applications
Thermal Protection For Personal Computers Digital Set-Top Boxes Notebook Computers Data Communications Power Supplies P r o j e c t o r s 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 TC650/TC651 are integrated temperature sensors and brushless DC fan speed controllers. The TC650/ TC651 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 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 TC650/TC651 also include a single trip point over temperature alert (T OVER) that eliminates the need for additional temperature sensors. In addition, the TC651 features an auto fan shutdown function for additional power savings. The TC650/TC651 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 TC650XXVUA 8-PinSOIC -40 °Ct o+ 1 2 5°C TC651XXVUA 8-PinMSOP -40 °Ct o+ 1 2 5°C XT e m p e r a t u r e A2 5 B3 0 C3 5 D4 0 E4 5 F5 0 G5 5 1 8 2 7 3 6 4 5 NC VDD PWM GND TOVER NCGND 8-Pin MSOP TC650 TC651 SHDN 8-Pin SOIC Tiny Integrated Temperature Sensor & Brushless DC Fan Controller with Over-Temperature Alert
DS21450B-page 2 2002 Microchip Technology Inc. Typical Application Diagram 1 8 2 7 3 6 4 5 NC VDD CSLOW PWM GND TOVER NCGND GND +5V VDD +12V TC650 TC651 SHDN GND µController DC Fan 500mA SHDN Control Over-Temp. Alert
2002 Microchip Technology Inc. DS21450B-page 3 TC650/TC651
1.0 ELECTRICAL
Absolute Maximum Ratings* *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. TC650/TC651 ELECTRICAL SPECIFICATIONS Note 1: Transition from 90% to 100% Duty Cycle. Electrical Characteristics: VDD = 2.8V to 5.5V, SHDN =V DD,T A =- 4 0°Ct o1 2 5°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 µAP W M , T OVER are open SHDN Input VIH SHDN Input High Threshold 65 — — %V DD VIL SHDN Input Low Threshold — — 15 %V DD PWM Output VOL PWM Output Low Voltage — — 0.3 V I SINK =1 m A VOH PWM Output High Voltage V DD -0 . 5 — — V I SOURCE =5 m A tR PWM Rise Time — 10 — µsec I OH =5 m A ,1 n Ff r o m PWM to GND tF PWM Fall Time — 10 — µsec I OL =1 m A ,1 n Ff r o m PWM to GND fOUT PWM Frequency 10 15 — Hz tSTARTUP Start-up Time — 32/f OUT —s e c V DD Rises from GND, or SHDN Released Temperature Accuracy TH ACC High T emperature Accuracy T H –3 T H TH +3 °C Note 1 (TH –TL) ACC T emp. Range Accuracy -1.0 — +1.0 °C( T H -T L) ≤ 20°C THYST Auto-shutdown Hysteresis — (T H -TL)/5 — °CT C 6 5 1 O n l y TOVER Output VHIGH TOVER Output High Voltage V DD -0 . 5 — — V I SOURCE =1 . 2 m A VLOW TOVER Output Low Voltage — — 0.4 V I SINK =2 . 5 m A TOVER HYST Trip Point Hysteresis — 5 — °C
DS21450B-page 4 2002 Microchip Technology Inc.
2.0 PIN DESCRIPTIONS
T h ed e s c r i p t i o n so ft h ep i n sa r el i s t e di nT a b l e2 - 1 . TABLE 2-1: PIN FUNCTION TABLE Pin No. (8-Pin MSOP) (8-Pin SOIC) Symbol Description 1V DD Power Supply Input. May be independent of fan power supply. 2 NC No Internal Connect.
3 SHDN
Fan Shutdown, Active-Low Input. During Shutdown mode the chip still monitors temper- ature and TOVER is low if temperature rises above factory set point. 4 GND Ground. Ground return for all TC650/TC651 functions. 5 NC No Connect. 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. DS21450B-page 5 TC650/TC651
3.0 DETAILED DESCRIPTION
The TC650/TC651 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 TC650/TC651 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 TC650/TC651 include an on-chip over-temperature alarm (T OVER) that gives a low signal when the temperature of the chip exceeds TH by 10°C, (typical). This feature eliminates the need for a separate temperature sensor for over-temperature monitoring. TABLE 3-1: TEMPERATURE RANGE DEFINITION FOR TC650 (MINIMUM-SPEED MODE) TABLE 3-2: TEMPERATURE RANGE DEFINITION FOR TC651 (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 TC650 and 50% to 100% for the TC651.
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 Over-Temperature Alert (T OVER)
This pin goes low when the TH set point is exceeded by 10oC (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 T OVER is asserted. Built-in hysteresis prevents TOVER from “chattering” when measured temperature is at or near the T H + 10°C trip point. As temperature falls through the T H + 10°C trip point, hysteresis maintains the T OVER output low until measured temperature is 5°C above the trip point setting. Temperature (T = TJ) PWM Duty Cycle T<T L 40% TL<=T<T 1 50% T1 <=T<T 2 60% T2 <=T< T 3 70% T3 <=T<T 4 80% T4 <=T<T H 90% 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 1 50% T1 <=T<T 2 60% T2 <= T<T 3 70% T3 <= T<T 4 80% T4 <=T<T H 90% TH <=T<T OV 100% TOV < = T 100% with Over-Temp Alert (TOVER =L ) Note:The temperature regions defined by the six temperature thresh- olds are pre-defined in the TC650/TC651 by means of trimming. Once aT L and TH are programmed, the T1 –T 4 thresholds are automatically equally spaced between TL and TH. Temperature Sensor Duty Cycle Logic Control A/D Converter Oscillator Temperature Set Point and Trim Range SHDNTOVER PWM VDD V+
DS21450B-page 6 2002 Microchip Technology Inc.
3.4 Shutdown (SHDN )
The fan can be unconditionally shutdown by pulling low the SHDN pin. During shutdown, the 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 T OVER are still in operation during shutdown. I DD shutdown current is around 50µA.
3.5 Auto-Shutdown Mode
The TC651 features auto-shutdown; when the temperature is below the factory set point at minimum speed (T L), PWM is low and the fan is automatically shut off (Auto-shutdown mode). This feature is ideal for notebook computers 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 (T 1).
3.6 Temperature Selection Guide
(Minimum Fan Speed/Full Speed) The five temperature regions defined by the six thresholds are defined in the TC650/TC651 by means of factory trimming. Once a T L and TH are set, the T1 – T4 thresholds are automatically equally spaced between TL and TH. Note: The Bold Type temperature settings are available for ordering. Contact factory for other temperature selec- tions. TL and TH c a nb es e l e c t e di n5 ° Ci n c r e m e n t s .TH must be chosen at least 10 oC higher than T L.T L can 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 order the part number TC650AEVUA. 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 TC651BEVUA. Temp. Range TL TH Part # 10°C 25 35 AC 30 40 BD 35 45 CE 15°C 25 40 AD 30 45 BE 35 50 CF 20°C 25 45 AE 30 50 BF 35 55 CG 30°C 25 55 AG
2002 Microchip Technology Inc. DS21450B-page 7 TC650/TC651
4.0 TYPICAL APPLICATIONS
4.1 Reducing Switching Noise
For fans consuming more than 300mA, a slowdown capacitor (C SLOW) is recommended for reducing switching PWM induced noise (see Figure 4-1). The value of this capacitor should be 4.7 µFt o4 7 µF, 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 1 8 2 7 3 6 4 5 NC VDD CSLOW PWM GND TOVER NCGND GND +5V VDD +12V TC650 TC651 SHDN GND µController DC Fan 500mA SHDN Control Over-Temp. Alert
DS21450B-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., out- side specified power supply range) and therefore outside the warranted range -50 0 0 246 81 0 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 TL T1 T2 T3 T4 TH TTHRESHOLD Temperature Accuracy vs. VTH Temp Accuracy (˚C)VDD - VOH (V) ISOURCE (mA) PWM, ISOURCE vs. (VDD - VOH), TA = 25˚C VDD = 2.8V VDD = 5.5V VDD = 2.7 VDD = 2.7 VDD = 5.6 VDD = 5.6 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 0 123 4 5 6 7 8 91 0 VOL (mV) ISINK (mA) PWM, ISINK vs. VOL, TA = 25˚C VDD = 2.8V VDD = 5.5V 0.0 100 150 200 250 300 350 400 450 500 0 123 4 5 6 7 8 91 0 VDD - VOH (V) ISOURCE (mA) TOVER, ISOURCE vs. (VDD - VOH), TA = 25˚C VDD = 2.8V VDD = 5.5V
2002 Microchip Technology Inc. DS21450B-page 9 TC650/TC651
6.0 PACKAGING INFORMATION
6.1 Package Marking Information
Package marking data not available at this time.
6.2 Taping Form
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 Component Taping Orientation for 8-Pin SOIC (Narrow) Devices Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 8-Pin SOIC (N) 12 mm 8 mm 2500 13 in Carrier Tape, Number of Components Per Reel and Reel Size Standard Reel Component Orientation for TR Suffix Device PIN 1 User Direction of Feed P W
DS21450B-page 10 2002 Microchip Technology Inc.
6.3 Package Dimensions
.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) .050 (1.27) TYP. 8° MAX. PIN 1 .244 (6.20) .228 (5.79) .157 (3.99) .150 (3.81) .197 (5.00) .189 (4.80) .020 (0.51) .013 (0.33) .010 (0.25) .004 (0.10) .069 (1.75) .007 (0.18) .050 (1.27) .016 (0.40) 8-Pin SOIC Dimensions: inches (mm)
2002 Microchip Technology Inc. DS21450B-page 11 TC650/TC651 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. T o 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.
DS21450B-page 12 2002 Microchip Technology Inc. NOTES:
2002 Microchip Technology Inc. DS21450B-page 13 TC650/TC651 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 T echnology 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, K EELOQ,m i c r o I D ,M P L A B ,P I C ,P I C m i c r o ,P I C M A S T E R , PICSTART, PRO MATE, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Tech- nology 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. © 2002, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. Microchip received QS-9000 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona in July 1999 and Mountain View, California in March 2002. The Company’s quality system processes and procedures are QS-9000 compliant for its PICmicro ® 8-bit MCUs, KEELOQ® code hopping devices, Serial EEPROMs, microperipherals, non-volatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001 certified.
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