tc650 tc651 tc650/1-2 3/05/01 ?2001 microchip technology inc. ds21450a tiny integrated temperature sensor and brushless dc fan controller with over temperature alert features digital temperature sensing and multi-speed fan control 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 o c (typical) accuracy from 25 o c to +70 o c 2.8 - 5.5v operating range tc651 includes auto fan shutdown low operating power: 50 a (typ) applications thermal protection for personal computers digital set-top boxes notebook computers data communications power supplies projectors related literature application note: 58 article: "an integrated fan speed control solu- tion can lower system costs, reduce acoustic noise and power consumption and enhance system reliability" pin configurations 8-pin msop 1 8 2 7 3 6 4 5 nc v dd pwm gnd tover nc gnd tc650 tc651 shdn typical application general description the tc650/651 are integrated temperature sensors and brushless dc fan speed controllers. the tc650/651 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 ther- mal 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 tempera- ture limits to control the fan. the tc650/651 also include a single trip point over temperature alert (tover) that elimi- nates the need for additional temperature sensors. in addi- tion, the tc651 features an auto fan shutdown function for additional power savings. the tc650/651 are easy to use, and require no soft- ware overhead, and are therefore the ideal choice for implementing thermal management in a variety of systems. ordering information part operating number package temp. range tc650xxvua 8-pin msop ?40?c to +125?c tc651xxvua 8-pin msop ?40?c to +125?c notes: 1. the "x" denotes a suffix for temperature threshold settings. 2. contact factory for other temperature ranges. x (see page 5) temperature a25 b30 c35 d40 e45 f50 g55 1 8 2 7 3 6 4 5 nc v dd pwm gnd tover nc gnd gnd +5v v dd +12v tc650 tc651 shdn gnd ucontroller dc fan 500ma shdn control over temp alert
tiny integrated temperature sensor and brushless dc fan controller with over temperature alert tc650 tc651 2 tc650/1-2 03/05/01 ?2001 microchip technology inc. ds21450a storage temperature (unbiased) .......... ?5 o c to +150 o c lead temperature (soldering, 10sec duration) ............................. +300 o c * this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation section of this specification is not implied. exposure to absolute maximum ratings conditions for extended periods of time may affect reliability. 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) package thermal resistance ( ja ) ...................... 250 o c/w operating temperature range .............. ?0 o c to +125 o c electrical characteristics: v dd = 2.8v to 5.5v, shdn = v dd , t a = -40?c to 125?c unless otherwise specified. symbol parameter test conditions min typ max units v dd supply voltage 2.8 5.5 v i dd supply current pwm tover are open 50 90 a shdn input v ih shdn input high threshold 65 %v dd v il shdn input low threshold 15 %v dd pwm output v ol pwm output low voltage i sink = 1ma 0.3 v v oh pwm output high voltage i source = 5ma v dd ?0.5 v t r pwm rise time i oh = 5ma, 1nf from pwm to gnd 10 sec t f pwm fall time i ol = 1ma, 1nf from pwm to gnd 10 sec f out pwm frequency 10 15 hz t startup startup time v dd rises from gnd, or shdn released 32/f out sec temperature accuracy t h acc high temp accuracy note 1 t h ?3 t h t h + 3 c (t h ? l)acc temp range accuracy (t h ?t l) 20 c ?.0 +1.0 c (t h ?t l) > 20 c ?.5 +2.5 t hyst auto shutdown hysteresis tc651 only (t h ?t l )/5 c tover output v high tover output high voltage i source = 1.2ma v dd ?0.5 v v low tover output low voltage i sink = 2.5ma 0.4 v tover acc absolute accuracy at trip point t h + 10 c tover hyst trip point hysteresis 5 c notes: 1. transition from 90% to 100% duty cycle.
tc650 tc651 3 tc650/1-2 03/05/01 tiny integrated temperature sensor and brushless dc fan controller with over temperature alert ? 2001 microchip technology inc. ds21450a block diagram temp sensor duty cycle logic control ad converter oscillator temperature set point and trim range tover shdn pwm v dd v+ pin description pin no. symbol description 8-pin msop 1v dd power supply input. may be independent of fan power supply. 2 nc no connect. 3 shdn fan shutdown, active-low input. during shut down mode the chip still monitors temperature and tover is low if temperature rises above f actory setpoint. 4 gnd ground. ground return for all tc650/651 functions. 5 nc no connect. 6 tover 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.
tiny integrated temperature sensor and brushless dc fan controller with over temperature alert tc650 tc651 4 tc650/1-2 03/05/01 ?2001 microchip technology inc. ds21450a functional description the tc650/651 acquire, and convert, their junction temperature (tj) information from an on-chip solid state sensor with a typical accuracy of 1 o c (typical) . 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 1). the tc650/ 651 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 controling the speed of the fan, the tc650/651 include an on-chip over-tempera- ture alarm (tover) that gives a low-true signal when the temperature of the chip exceeds t h by 10 c. this feature eliminates the need for a separate temperature sensor for over-temperature monitoring. table 1: temperature range definition for tc650 (minimum-speed mode) temperature (t=tj) pwm duty cycle t tc650 tc651 5 tc650/1-2 03/05/01 tiny integrated temperature sensor and brushless dc fan controller with over temperature alert ? 2001 microchip technology inc. ds21450a auto-shutdown mode the tc651 features auto shutdown: when the tempera- ture 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 comput- ers 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 ). temperature selection guide (minimum fan speed/full speed) the five temperature regions defined by the six thresh- olds are defined in the tc650/651 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 . range t l t h 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 note: the bold type temperature settings are available for ordering. contact factory for other temperature selections. t l and t h can be selected in 5 o c increments. t h must be chosen at least 10 o c higher than t l . t l can range anywhere from 25 o c to 35 o c. as an example, suppose you wanted the fan to run at 40% speed at 25 o c or less and go to full speed at 45 o c. you would order the part number tc650aevua. as another example, suppose you wanted the fan to turn on at 30 o c and go to full speed at 45 o c. you would order the part number tc651bevua. applications information reducing switching noise for fans consuming more than 300ma, a slowdown capacitor (c slow ) is recommended for reducing switching pwm induced noise (see figure 1). the value of this capacitor should be 4.7 f to 47 f, depending on the fan current consumption. please see application note 38 for more information. figure 1. reducing switching noise 1 8 2 7 3 6 4 5 nc v dd pwm gnd tover nc gnd gnd +5v v dd +12v tc650 tc651 shdn gnd ucontroller dc fan 500ma shdn control over temp alert
tiny integrated temperature sensor and brushless dc fan controller with over temperature alert tc650 tc651 6 tc650/1-2 03/05/01 ?2001 microchip technology inc. ds21450a 90 80 70 60 50 40 30 20 10 0 ?0 0 0 24 6 810 12 14 16 18 20 25 ?5 50 75 100 125 150 temperature ( c) i dd vs. temperature i dd ( a) 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 vs. v th temp accuracy ( c) v dd - v oh (v) i source (ma) pwm, i source vs. (v dd - v oh ), t a = 25 c v dd = 2.8v v dd = 5.5v v dd = 2.7v v dd = 5.6v v dd = 5.6v v dd = 2.7v 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 12 3 4 5 6 7 8 910 v ol (mv) i sink (ma) pwm, i sink vs. v ol , t a = 25 c v dd = 2.8v v dd = 5.5v 0 50 100 150 200 250 300 350 400 450 500 v dd - v oh (v) i source (ma) t over , i source vs. (v dd - v oh ), t a = 25 c v dd = 2.8v v dd = 5.5v 0 12 3 4 5 6 7 8 910 typical characteristic curves
tc650 tc651 7 tc650/1-2 03/05/01 tiny integrated temperature sensor and brushless dc fan controller with over temperature alert ? 2001 microchip technology inc. ds21450a tape and reel diagram pin 1 pin 1 component taping orientation for 8-pin msop devices user direction of feed user direction of feed standard reel component orientation for tr suffix device reverse reel component orientation for rt suffix device w p 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 package dimensions dimensions: inches (mm) 8-pin msop .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
tiny integrated temperature sensor and brushless dc fan controller with over temperature alert tc650 tc651 8 tc650/1-2 03/05/01 ? 2001 microchip technology inc. ds21450a information contained in this publication regarding device applications and the like is intended through suggestion only and ma y be superseded by updates. it is your responsibility to ensure that your application meets with your specifications. no representation or warrant y is given and no liability is assumed by microchip technology incorporated with respect to the accuracy or use of such information, or infringement of patent s 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, except as maybe explicitly expressed herein, under any intellec- tual property rights. the microchip logo and name are registered trademarks of microchip technology inc. in the u.s.a. and othe r countries. all rights reserved. all other trademarks mentioned herein are the property of their respective companies. all rights reserved. ? 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