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| ? 2004 microchip technology inc. ds21450c-page 1 tc650/tc651 features ? integrated temperature sensing and multi-speed fan control built-in overtemperature alert (t over ) temperature-proportional fan speed control for acoustic noise reduction and longer fan life pulse width modulation (pwm) output drive for cost and power savings solid-state temperature sensing 1 c (typ.) accuracy from 25 c to +70 c operating range: 2.8v ? 5.5v tc651 includes automatic fan shutdown low operating current: 50 a (typ.) applications thermal protection for personal computers digital set-top boxes notebook computers data communications power supplies projectors related literature application note 771 (ds00771) general description the tc650/tc651 are integrated temperature sensors and brushless dc fan speed controllers. the tc650/ tc651 measure the 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. package type 1 8 27 3 6 4 5 nc v dd pwm t over nc gnd 8-pin msop shdn gnd tc650 tc651 tiny integrated temperature sensor & brushless dc fan controller with over temperature alert
tc650/tc651 ds21450c-page 2 ? 2004 microchip technology inc. typical application circuit 1 8 27 3 6 4 5 nc v dd c slow pwm gnd t over nc gnd gnd +5v v dd +12v tc650 tc651 shdn gnd picmicro ? dc fan 500 ma shdn control overtemperature alert microcontroller ? 2004 microchip technology inc. ds21450c-page 3 tc650/tc651 1.0 electrical characteristics absolute maximum ratings? input voltage (v dd to gnd) ................................... +6v output voltage (out to gnd) ................................. 6v voltage on any pin ....... (gnd ? 0.3v) to (v dd + 0.3v) operating temperature range ......... ?40 c to +125 c storage temperature ........................ ?65 c to +150 c ? notice: stresses above those listed under "absolute maxi- mum ratings" may cause permanent damage to the device. these are stress ratings only and functional operation of the device at these or any other c onditions 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. dc characteristics electrical specifications: unless otherwise specified, v dd = 2.8v to 5.5v, shdn = v dd , t a = ?40 c to +125 c. parameters sym min typ max units conditions supply voltage v dd 2.8 ? 5.5 v supply current i dd ?5090apwm, t over are open shdn input shdn input high threshold v ih 65 ? ? %v dd shdn input low threshold v il ??15%v dd pwm output pwm output low voltage v ol ? ? 0.3 v i sink = 1 ma pwm output high voltage v oh v dd ? 0.5 ? ? v i source = 5 ma pwm rise time t r ?10 ? si oh = 5 ma, 1 nf from pwm to gnd pwm fall time t f ?10 ? si ol = 1 ma, 1 nf from pwm to gnd pwm frequency f out 10 15 ? hz start-up time t startup ? 32/f out ?secv dd rises from gnd or shdn released temperature accuracy high temperature accuracy t h acc t h ? 3 t h t h + 3 c note 1 temperature range accuracy (t h ? t l ) acc ?1.0 ? +1.0 c (t h ? t l ) 20 c ?2.5 ? +2.5 c (t h ? t l ) 20 c auto-shutdown hysteresis t hyst ?(t h -t l )/5 ? c tc651 only t over output t over output high voltage v high v dd ? 0.5 ? ? v i source = 1.2 ma t over output low voltage v low ? ? 0.4 v i sink = 2.5 ma absolute accuracy t over acc ?t h + 10 ? c at trip point trip point hysteresis t over hyst ?5?c note 1: transition from 90% to 100% duty cycle. tc650/tc651 ds21450c-page 4 ? 2004 microchip technology inc. temperature characteristics electrical specifications: unless otherwise noted, v dd = 2.8v to 5.5v, s hdn = v dd , t a = -40 c to +125 c. parameters sym min typ max units conditions temperature ranges specified temperature range t a ?40 ? +125 c maximum junction temperature t j ??+150c storage temperature range t a ?65 ? +150 c package thermal resistances thermal resistance, 8l-msop ja ?206.3 ? c/w ? 2004 microchip technology inc. ds21450c-page 5 tc650/tc651 2.0 typical performance curves note: unless otherwise indicated, v dd = 2.8v to 5.5v, s hdn = v dd , t a = ?40 c to +125 c. figure 2-1: i dd vs. temperature. figure 2-2: pwm, i sink vs. v ol . figure 2-3: t over , i source vs. (v dd ? v oh ). figure 2-4: temperature accuracy vs. v th . figure 2-5: pwm, i source vs. (v dd ? v oh ). note: 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. 90 80 70 60 50 40 30 20 10 0 -50 0 25 -25 50 75 100 125 150 temperature (c) i dd (a) v dd = 2.7 v dd = 5.6 0 12 3 4 5 6 7 8 910 v ol (mv) i sink (ma) v dd = 2.8v v dd = 5.5v 0.0 50 100 150 200 250 300 350 400 450 500 t a = +25c 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0 12 3 4 5 6 7 8 910 v dd - v oh (v) i source (ma) v dd = 2.8v v dd = 5.5v t a = +25c 3.0 2.5 2.0 1.5 1.0 0.5 0.0 t l t 1 t 2 t 3 t 4 t h t threshold temp accuracy (c) v dd = 2.7 v dd = 5.6 0 24 6 810 12 14 16 18 20 v dd - v oh (v) i source (ma) v dd = 2.8v v dd = 5.5v 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 t a = +25c tc650/tc651 ds21450c-page 6 ? 2004 microchip technology inc. 3.0 pin description the descriptions of the pins are listed in table 3-1. table 3-1: pin function table 3.1 power supply input may be independent of fan power supply. 3.2 fan shutdown, active-low input during shutdown mode, the chip still monitors temperature. t over is low if temperature rises above factory set point. 3.3 ground ground return for all tc650/tc651 functions. 3.4 overtemperature alert active-low output. 3.5 pwm fan drive output pulse width modulated rail-to-rail logic output. nominal frequency is 15 hz. pin no. symbol description 1v dd power supply input 2 nc no internal connect 3 shdn fan shutdown, active-low input 1 = fan in normal operation 0 = fan in shutdown 4 gnd ground 5 nc no connect 6 t over overtemperature alert, active-low output 1 = overtemperature condition does not exist 0 = the device is in the overtemperature condition. the fan is driven at 100%. potential exists for system over-heating 7 gnd ground 8 pwm pwm fan drive output ? 2004 microchip technology inc. ds21450c-page 7 tc650/tc651 4.0 detailed description the tc650/tc651 acquire and convert their junction temperature (t j ) information from an on-chip, solid- state sensor with a typical accuracy of 1c. the tem- perature data is digitally stored in an internal register. the register is compared with pre-defined threshold val- ues. the six threshold values are equally distributed over a pre-defined range of temperatures (see table 4- 1). the tc650/tc651 control the speed of a dc brush- less fan using a fractional speed-control scheme. the output stage requires only a 2n2222-type, small-signal bjt for fans up to 300 ma. 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 overtemperature alarm (t over ) that gives a low signal when the temper- ature of the chip exceeds t h by 10c (typical). this fea- ture eliminates the need for a separate temperature sensor for overtemperature monitoring. figure 4-1 shows the block diagram of the device. figure 4-1: functional block diagram. 4.1 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 15 hz. the pwm is also the time base for the start-up timer (see section 4.2 ?start-up timer? ). the pwm duty cycle has a range of 40% to 100% for the tc650 and 50% to 100% for the tc651. 4.2 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. 4.3 overtemperature alert (t over ) this pin goes low when the t h 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 air- flow obstruction). this output may be treated as a ?system overheat? warning and be used to either trigger system shutdown or bring other fans in the system to full speed. the fan will continue to run at full speed while t over is asserted. built-in hysteresis prevents t over from ?chattering? when the measured temperature is at or near the t h + 10c trip point. as temperature falls through the t h + 10c trip point, hys- teresis maintains the t over output low until the measured temperature is 5c above the trip point setting. 4.4 shutdown (shdn ) the fan can be unconditionally shut down by pulling the shdn pin low. during shutdown, the pwm output is low; ideal for notebook computers and other portable applications where 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 50 a. 4.5 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 in order to monitor temperature for t over . the tc651 exits auto- shutdown mode when the temperature rises above the factory set point (t 1 ). temperature sensor duty cycle logic control a/d converter oscillator temperature set point and trim range shdn t over pwm v dd v+ tc650/tc651 ds21450c-page 8 ? 2004 microchip technology inc. 4.6 temperature selection guide (minimum fan speed/full speed) there are two temperature thresholds that determine the characteristics of the device. the minimum fan speed temperature (t l ) and the full fan speed temper- ature (t h ). depending on the tc65x device selected, when the temperature is below the t l trip point, the pwm output will perform a different operation. for the tc650, the pwm will be driven at the minimum pwm frequency, while the tc651 will shut down the pwm (pwm = l). t l and t h can be selected in 5c increments. t l can range from 25c to 35c. t h can range from 35c to 55c and must be 10c (or more) than the specified t l . 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 t h are set, the t 1 ? t 4 thresholds are automatically equally spaced between t l and t h . table 4-1 shows these 5 regions and what the corresponding pwm duty cycle is. table 4-1: temperature range definition table 4-2 shows the device codes that specify the t h and t l temperature thresholds. the following exam- ples are given to assist in understanding the device- ordering nomenclature. example 1: 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. example 2: 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. table 4-2: device codes for temperature thresholds temperature (t = t j ) (note 1) pwm duty cycle tc650 (minimum speed mode) tc651 (auto-shutdown mode) t < t l 40% off t l < = t < t 1 50% 50% t 1 < = t < t 2 60% 60% t 2 < = t tc650/tc651 ds21450c-page 10 ? 2004 microchip technology inc. 6.0 packaging information 6.1 package marking information legend: xx...x customer specific information* y year code (last digit of calendar year) ww week code (week of january 1 is week ?01?) nnn alphanumeric traceability code note : in the event the full microchip part number cannot be marked on one line, it will be carried over to the next line thus limiting the number of available characters for customer specific information. * standard device marking consists of microchip part number, year code, week code, and traceability code. 8-lead msop example: xxxxx ywwnnn 650acv 406256 ? 2004 microchip technology inc. ds21450c-page 11 tc650/tc651 8-lead plastic micro small outline package (ms) (msop) d a a1 l c (f) a2 e1 e p b n 1 2 5 5 - - dimensions d and e1 do not include mold flash or protrusions. mold flash or protrusions shall not .037 ref f footprint (reference) exceed .010" (0.254mm) per side. notes: drawing no. c04-111 *controlling parameter mold draft angle top mold draft angle bottom foot angle lead width lead thickness c b .003 .009 .006 .012 dimension limits overall height molded package thickness molded package width overall length foot length standoff overall width number of pins pitch a l e1 d a1 e a2 .016 .024 .118 bsc .118 bsc .000 .030 .193 typ. .033 min p n units .026 bsc nom 8 inches 0.95 ref - - .009 .016 0.08 0.22 0 0.23 0.40 8 millimeters* 0.65 bsc 0.85 3.00 bsc 3.00 bsc 0.60 4.90 bsc .043 .031 .037 .006 0.40 0.00 0.75 min max nom 1.10 0.80 0.15 0.95 max 8 -- - 15 5 - 15 5 - jedec equivalent: mo-187 0 - 8 5 5 - - 15 15 - - - - tc650/tc651 ds21450c-page 12 ? 2004 microchip technology inc. 6.2 product tape and reel specifications figure 6-1: embossed carrier dimensions figure 1: msop devices to p cover tape k 0 p w b 0 a 0 table 1: carrier tape/cavity dimensions case outline package type carrier dimensions cavity dimensions output quantity units reel diameter in mm w mm p mm a0 mm b0 mm k0 mm ms msop 8l 12 8 5.3 3.6 1.4 2500 330 user direction of feed p, pitch pin 1 pin 1 reverse reel component orientation w, width of carrier tape standard reel component orientation ? 2004 microchip technology inc. ds21450c-page 13 tc650/tc651 product identification system to order or obtain information, e. g., on pricing or delivery, refer to the factory or the listed sales office . sales and support part no. x xx package temperature range device device: tc650: temp sensor & brushless dc fan controller / overtemperature alert (minimum speed) tc651: temp sensor & brushless dc fan controller / overtemperature alert (auto shutdown) temperature threshold limit: temperature difference t l (1,2) t h (1,3) threshold limit code 10c 25 30 35 35 40 45 ac bd ce 15c 25 30 35 40 45 50 ad be cf 20c 25 30 35 45 50 55 ae bf cg 30c 25 55 ag 1. t l and t h can be selected in 5c increments. 2. t l can range from 25c to 35c. 3. t h can range from 35c to 55c and must be at least 10c higher than t l . temperature range: v = -40 c to +125 c (extended) package: ua = plastic micro small outline (msop), 8-lead uatr = plastic micro small outline (msop), 8-lead (tape and reel) examples: a) tc650acvua: temp sensor t l = 25, t h = 35 b) tc651acvuatr: temp sensor t l = 25, t h = 35 tape and reel c) tc650aevua: temp sensor t l = 25, t h = 45 d) tc651agvua: temp sensor t l = 25, t h = 55 e) tc650bevua: temp sensor t l = 30, t h = 45 f) tc651cgvua: temp sensor t l = 35, t h = 55 g) tc650cgvuatr: temp sensor t l = 35, t h = 55 tape and reel xx temperature threshold limit 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. 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. customer notification system register on our web site (www.microchip.com/cn) to receive the most current information on our products. tc650/tc651 ds21450c-page 14 ? 2004 microchip technology inc. notes: ? 2004 microchip technology inc. ds21450c-page 15 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 m eets with your specifications. no representation or warranty is given and no liability is assumed by microchip technol ogy 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 micr ochip?s products as critical components in life support syst ems is not authorized except with express written approval by microchip. no licenses are conveyed, implicitly or ot herwise, under any intellectual property rights. trademarks the microchip name and logo, the microchip logo, accuron, dspic, k ee l oq , micro id , mplab, pic, picmicro, picstart, pro mate, powersmart, rfpic, and smartshunt are registered trademarks of microchip technology incorporated in the u.s.a. and other countries. amplab, filterlab, mxdev, mxlab, picmaster, seeval, smartsensor and the embedded control solutions company are registered trademarks of microchip technology incorporated in the u.s.a. analog-for-the-digital age, app lication maestro, dspicdem, dspicdem.net, dspicworks, ecan, economonitor, fansense, flexrom, fuzzylab, in-circuit serial programming, icsp, icepic, migratable memory, mpasm, mplib, mplink, mpsim, pickit, picdem, picdem.net, piclab, pictail, powercal, powerinfo, powermate, powertool, rflab, rfpicdem, select mode, smart serial, smarttel and total endurance ar e trademarks of microchip technology incorporated in the u.s.a. and other countries. sqtp is a service mark of mi crochip technology incorporated in the u.s.a. all other trademarks mentioned herein are property of their respective companies. ? 2004, microchip technology incorporated, printed in the u.s.a., all rights reserved. printed on recycled paper. note the following details of the code protection feature on microchip devices: microchip products meet the specification cont ained in their particular microchip data sheet. microchip believes that its family of products is one of the most secure families of its kind on the market today, when used i n the intended manner and under normal conditions. there are dishonest and possibly illegal methods used to breach the code protection feature. all of these methods, to our knowledge, require using the microchip produc ts in a manner outside the operating specif ications contained in microchip?s data sheets. most likely, the person doing so is engaged in theft of intellectual property. microchip is willing to work with the customer who is concerned about the integrity of their code. neither microchip nor any other semiconduc tor manufacturer can guarantee the security of their code. code protection does not mean that we are guaranteeing the product as ?unbreakable.? code protection is constantly evolving. we at microchip are co mmitted to continuously improvin g the code protection features of our products. attempts to break microchip?s code protection feature may be a violation of the digital millennium copyright act. if such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that act. microchip received iso/ts-16949:2002 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in chandler and tempe, arizona and mountain view, california in october 2003. the company?s quality system processes and procedures are for its picmicro ? 8-bit mcus, k ee l oq ? code hopping devices, serial eeproms, microperipherals, nonvolatile memory and analog products. in addition, microchip?s quality system for the design and manufacture of development systems is iso 9001:2000 certified. ds21450c-page 16 ? 2004 microchip technology inc. americas corporate office 2355 west chandler blvd. chandler, az 85224-6199 tel: 480-792-7200 fax: 480-792-7277 technical support: 480-792-7627 web address: www.microchip.com atlanta alpharetta, ga tel: 770-640-0034 fax: 770-640-0307 boston westford, ma tel: 978-692-3848 fax: 978-692-3821 chicago itasca, il tel: 630-285-0071 fax: 630-285-0075 dallas addison, tx tel: 972-818-7423 fax: 972-818-2924 detroit farmington hills, mi tel: 248-538-2250 fax: 248-538-2260 kokomo kokomo, in tel: 765-864-8360 fax: 765-864-8387 los angeles mission viejo, ca tel: 949-462-9523 fax: 949-462-9608 san jose mountain view, ca tel: 650-215-1444 fax: 650-961-0286 toronto mississauga, ontario, canada tel: 905-673-0699 fax: 905-673-6509 asia/pacific australia - sydney tel: 61-2-9868-6733 fax: 61-2-9868-6755 china - beijing tel: 86-10-8528-2100 fax: 86-10-8528-2104 china - chengdu tel: 86-28-8676-6200 fax: 86-28-8676-6599 china - fuzhou tel: 86-591-750-3506 fax: 86-591-750-3521 china - hong kong sar tel: 852-2401-1200 fax: 852-2401-3431 china - shanghai tel: 86-21-6275-5700 fax: 86-21-6275-5060 china - shenzhen tel: 86-755-8290-1380 fax: 86-755-8295-1393 china - shunde tel: 86-757-2839-5507 fax: 86-757-2839-5571 china - qingdao tel: 86-532-502-7355 fax: 86-532-502-7205 asia/pacific india - bangalore tel: 91-80-2229-0061 fax: 91-80-2229-0062 india - new delhi tel: 91-11-5160-8632 fax: 91-11-5160-8632 japan - kanagawa tel: 81-45-471- 6166 fax: 81-45-471-6122 korea - seoul tel: 82-2-554-7200 fax: 82-2-558-5932 or 82-2-558-5934 singapore tel: 65-6334-8870 fax: 65-6334-8850 taiwan - kaohsiung tel: 886-7-536-4816 fax: 886-7-536-4817 taiwan - taipei tel: 886-2-2500-6610 fax: 886-2-2508-0102 taiwan - hsinchu tel: 886-3-572-9526 fax: 886-3-572-6459 europe austria - weis tel: 43-7242-2244-399 fax: 43-7242-2244-393 denmark - ballerup tel: 45-4420-9895 fax: 45-4420-9910 france - massy tel: 33-1-69-53-63-20 fax: 33-1-69-30-90-79 germany - ismaning tel: 49-89-627-144-0 fax: 49-89-627-144-44 italy - milan tel: 39-0331-742611 fax: 39-0331-466781 netherlands - drunen tel: 31-416-690399 fax: 31-416-690340 england - berkshire tel: 44-118-921-5869 fax: 44-118-921-5820 w orldwide s ales and s ervice 08/24/04 |
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