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? 2001-2012 microchip technology inc. ds21439d-page 1 tc620/tc621 features: ? user programmable hysteresis and temperature set point ? easily programs with 2 external resistors ? wide temperature detection range: -0c to 70c: (tc620/tc621ccx) -40c to +125c: (tc620/tc621cvx) -40c to +85c: (tc620/tc621cex) -55c to +125c: (tc620/tc621cmx) ? onboard temperature sensing applications (tc620x) ? external ntc thermistor for remote sensing applications (tc621x) ? available in 8-pin pdip and soic packages applications: ? power supply over temperature detection ? consumer equipment ? temperature regulators ? cpu thermal protection device selection table note: *the part code will be c or h (see functional block diagrams). package type general description: the tc620 and tc621 are programmable logic output temperature detectors designed for use in thermal management applications. the tc620 features an onboard temperature sensor, while the tc621 connects to an external ntc thermistor for remote sensing applications. both devices feature dual thermal interrupt outputs (high limit and low limit), each of which is pro- grammed with a single external resistor. on the tc620, these outputs are driven active (high) when measured temperature equals the user programmed limits. the control (hysteresis) output is driven high when tem- perature equals the high limit setting and returns low when temperature falls below the low limit setting. this output can be used to provide on/off control to a cooling fan or heater. the tc621 provides the same output functions except that the logical states are inverted. the tc620/tc621 are usable over operating temperature ranges of 0c to 70c, -40c to +125c and -55c to 125c. part number package temperature range tc620x*coa 8-pin soic 0c to +70c tc620x*cpa 8-pin pdip 0c to +70c tc620x*eoa 8-pin soic -40c to +85c tc620x*epa 8-pin pdip -40c to +85c tc620c*voa 8-pin soic -40c to +125c tc621x*coa 8-pin soic 0c to +70c tc621x*cpa 8-pin pdip 0c to +70c tc621x*eoa 8-pin soic -40c to +85c tc621x*epa 8-pin pdip -40c to +85c thermistor 8-soic 8-soic v dd gnd low limit control nc low set high set high limit v dd gnd low limit control low set high set high limit 8 7 6 5 1 2 3 4 tc621xcoa tc621xeoa 8 7 6 5 1 2 3 4 tc620xcoa tc620xeoa tc620cvoa thermistor 8-pdip v dd gnd low limit control low set high set high limit 8 7 6 5 1 2 3 4 tc621xcpa tc621xepa nc 8-pdip v dd gnd low limit control high set low set high limit 8 7 6 5 1 2 3 4 tc620xcpa tc620xepa 5v, dual trip point temperature sensors
tc620/tc621 ds21439d-page 2 ? 2001-2012 microchip technology inc. functional block diagrams 3 high set 2 low set 5 control* 6 high limit v dd 7 low limit 8 4 *suffix code "c" denotes cooling option (high true control output). suffix code "h" denotes heating option (low true control output). q s r q + + ? ? tc620 high set low set 1 thermistor control* high limit low limit temp. to voltage converter v ref gen v ref gen v ref 3 2 5 6 v dd 7 8 4 q s r q + + ? ? tc621 thermistor interface circuit v ref gen v ref gen v ref
? 2001-2012 microchip technology inc. ds21439d-page 3 tc620/tc621 1.0 electrical characteristics absolute maximum ratings* supply voltage ....................................................... 20v input voltage any input .. (gnd ? 0.3v) to (v dd +0.3v) package power dissipation (t a ? 70c) pdip ............................................. 730 mw soic ............................................. 470 mw derating factors: plastic .......................................... 8 mw/c operating temperature: m version......................... -55c to +125c v version ......................... -40c to +125c e version ........................... -40c to +85c c version .............................. 0c to +70c storage temperature ......................... -65c to +150c *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 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. tc620/tc621 electrical specifications electrical characteristics: t a = 25c, unless otherwise specified. symbol parameter min typ max unit test conditions v dd supply voltage range 4.5 ? 18 v i dd supply current ? 270 400 ? a5v ? v dd ? 18v r out output resistance ? 400 1000 w output high or low, 5v ? v dd ? 18v i out output current ? ? 1 ma temp. sensed source/sink i out output current ? ? 1 ma cool/heat source/sink t err absolute accuracy t - 3 t t + 3 c t = programmed temperature
tc620/tc621 ds21439d-page 4 ? 2001-2012 microchip technology inc. 2.0 pin descriptions the descriptions of the pins are listed in table 2-1. table 2-1: pin function table pin no. (8-pin pdip) (8-pin soic) 0c to +70c -40c to +85c -40c to +125c symbol description 1 nc no internal connection. 2 low set low temperature set point. connect an external 1% resistor from low set to v dd to set trip point. 3 high set high temperature set point. connect an external 1% resistor from high set to v dd to set trip point. 4 gnd ground terminal. 5 control control output. 6 high limit high temperature push/pull output. 7 low limit low temperature push/pull output. 8v dd power supply input. pin no. (8-pin pdip) (8-pin soic) 0c to +70c -40c to +85c symbol description 1 thermistor thermistor input. 2 high set high temperature set point. connect an external 1% resistor from high set to v dd to set trip point. 3 low set low temperature set point. connect an external 1% resistor from low set to v dd to set trip point. 4 gnd ground terminal. 5 control control output. 6low limit low temperature push/pull output. 7high limit high temperature push/pull output. 8v dd power supply input.
? 2001-2012 microchip technology inc. ds21439d-page 5 tc620/tc621 3.0 detailed description the tc620 has a positive temperature coefficient tem- perature sensor and a dual threshold detector. temper- ature set point programming is accomplished with external resistors from the high set and low set inputs to v dd. the high limit and low limit outputs remain low as long as measured temperature is below set point values. as measured temperature increases, the low limit output is driven high when temperature equals the low set set point (3c max). if tempera- ture continues to climb, the high limit output is driven high when temperature equals the high set set point (figure 3-1). the control (hysteresis) output is latched in its active state at the temperature specified by the high set resistor. control is maintained active until temperature falls to the value specified by the low set resistor. figure 3-1: tc620/tc621 input vs. output logic 3.1 programming the tc620 the resistor values to achieve the desired trip point temperatures on high set and low set are calculated using equation 3-1: equation 3-1: for example, a 50c setting on either the high set or low set input is calculated using equation 3-2 as follows: equation 3-2: care must be taken to ensure the low set program- ming resistor is a smaller value than the high set programming resistor. failure to do this will result in erroneous operation of the control output. care must also be taken to ensure the low set temperature setting is at least 5c lower than the high set temperature setting. figure 3-2 can help the user obtain an estimate of the external resistor values required for the desired low set and high set trip points. figure 3-2: tc620 sense resistors vs. trip temperature 3.2 built-in hysteresis to prevent output ?chattering? when measured temperature is at (or near) the programmed trip point values, the low set and high set inputs each have built-in hysteresis of -2c below the programmed settings (figure 3-3). figure 3-3: built-in hysteresis on low limit and high limit outputs as shown, the outputs remain in their active state (hysteresis) until temperature falls an additional 2c below the user?s setting. low set point high set point low limit output high limit output control output (cool option control output (heat option) temperature r trip = 0.5997 x t 2.1312 where: r trip = programming resistor in ohms t = the desired trip point temperature in degrees kelvin. r set = 0.5997 x ((50 + 273.15) 2.1312 ) = 133.6 k ? temperature (c) resistance, r trip (k ) -55 -35 -15 5 25 45 65 85 105 125 50 100 150 200 250 set point (set point 2c) high limit or low limit output
tc620/tc621 ds21439d-page 6 ? 2001-2012 microchip technology inc. 3.3 using the tc621 the tc621 operation is similar to that of the tc620, but requires an external ntc thermistor. use the resis- tance versus temperature curve of the thermistor to determine the values of the programming resistors. note that the pin numbers for the high set and low set programming resistors for the tc621 are reversed versus that of the tc620 (i.e., the resistor value on high set [pin 2] should always be lower than the one connected to low set [pin 3]). also note that the outputs of the tc621 are low true when used with an ntc thermistor. 3.4 tc621 thermistor selection the tc621 uses an external thermistor to monitor the controlling temperature. a thermistor with a resistance value of approximately 100 k ? at 25c is recommended. a temperature set point is selected by picking a resis- tor whose value is equal to the resistance of the therm- istor at the desired temperature. for example, using the data shown in figure 3-4, a 30 k ? resistor between high temp (pin 2) and v dd (pin 8) sets the high temperature trip point at +51c and a 49 k ? resistor on low temp (pin 3) sets the low temperature trip point to +41c. figure 3-4: typical ntc thermistor 3.5 tc620/tc621 outputs both devices have complimentary output stages. they are rated at a source or sink current of 1 ma maximum. 01020304050 100 70 temperature (c) 0 50 60 150 200 250 300 350 thermistor resistance (k )
? 2001-2012 microchip technology inc. ds21439d-page 7 tc620/tc621 4.0 typical applications 4.1 dual speed temperature control in figure 4-1, the dual speed temperature control uses a tc620 and a tc4469 quad driver. two of the drivers of the tc4469 are configured in a simple oscil- lator. when the temperature is below the low temp set point, the output of the driver is off. when the tem- perature exceeds the low temp set point, the tc4469 gates the oscillator signal to the outputs of the driver. this square wave signal modulates the remain- ing outputs and drives the motor at a low speed. if this speed cannot keep the temperature below the high temp set point, then the driver turns on continuously which increases the fan speed to high. the tc620 will monitor the temperature and only allow the fan to oper- ate when needed and at the required speed to maintain the desired temperature. a higher power option can be designed by adding a resistor and a power mosfet. 4.2 temperature controlled fan in the application in figure 4-2, a high and a low tem- perature is selected by two r l and r h . the tc620 monitors the ambient temperature and turns the fet switch on when the temperature exceeds the high temp set point. the fan remains on until the tempera- ture decreases to the low temp set point. this provides the hysteresis. in this application, the fan turns on only when required. the tc621 uses an external thermistor to monitor the ambient temperature. this adds one part, but allows more flexibility with the location of the temperature sensor. figure 4-1: dual speed temperature control figure 4-2: temperature controlled fan tc620 2 3 1 5 6 7 +12v v motor mosfet fan motor 50 higher power option 1n4148 1n4148 8 4 tc4469 2 1 3 5 8 13 4 6 9 10 11 12 14 1m 10k 100k high limit low limit fan motor 50 pf temperature scale 7 low temp. 30 c ? high temp. 50 c ? 10 f 0.1 f ? 30 c (fan off) ? 50 c (fan low) ? up (fan high) ? ? 1 f 0 c 30 c 50 c ? ? ? tc620 high temp. 1 2 3 4 8 7 6 5 low temp. +12v mtp3055e fan motor tc621 high temp. 1 2 3 4 8 7 6 5 low temp. +12v mtp3055e fan motor thermistor (ntc) r l r l r h r h
tc620/tc621 ds21439d-page 8 ? 2001-2012 microchip technology inc. figure 4-3: heating and cooling application tc620 1 2 3 4 8 7 6 5 tc4469 1 2 3 4 5 6 7 14 13 12 11 10 9 8 high temp. warning heating/cooling equipment 1k 1k low temp. warning 4.5v to 18v high temp. low temp.
? 2001-2012 microchip technology inc. ds21439d-page 9 tc620/tc621 5.0 packaging information 5.1 package marking information package marking data not available at this time. 5.2 taping form 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 713 suffix device pin 1 user direction of feed p w
tc620/tc621 ds21439d-page 10 ? 2001-2012 microchip technology inc. 5.3 package dimensions package dimensions (continued) 3 min. pin 1 .260 (6.60) .240 (6.10) .045 (1.14) .030 (0.76) .070 (1.78) .040 (1.02) .400 (10.16) .348 (8.84) .200 (5.08) .140 (3.56) .150 (3.81) .115 (2.92) .110 (2.79) .090 (2.29) .022 (0.56) .015 (0.38) .040 (1.02) .020 (0.51) .015 (0.38) .008 (0.20) .310 (7.87) .290 (7.37) .400 (10.16) .310 (7.87) 8-pin plastic dip dimensions: inches (mm) note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging .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) .053 (1.35) .010 (0.25) .007 (0.18) .050 (1.27) .016 (0.40) 8-pin soic dimensions: inches (mm) note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging
? 2001-2012 microchip technology inc. ds21439d-page 11 tc620/tc621 6.0 revision history revision d (december 2012) added a note to each package outline drawing.
tc620/tc621 ds21439d-page 12 ? 2001-2012 microchip technology inc. notes:
? 2001-2012 microchip technology inc. ds21439d-page 13 tc620/tc621 sales and support data sheets products supported by a preliminary data sheet may have an e rrata sheet describing minor operational differences and recom- mended workarounds. to determine if an erra ta sheet exists for a particular device, please contact one of the following: 1. your local microchip sales office 2. 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.
tc620/tc621 ds21439d-page 14 ? 2001-2012 microchip technology inc. notes:
? 2001-2012 microchip technology inc. ds21439d-page 15 information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. it is your responsibility to ensure that your application meets with your specifications. microchip makes no representations or warranties of any kind whether express or implied, written or oral, statutory or otherwise, related to the information, including but not limited to its condition, quality, performance, merchantability or fitness for purpose . microchip disclaims all liability arising from this information and its use. use of microchip devices in life support and/or safety applications is entirely at the buyer?s risk, and the buyer agrees to defend, indemnify and hold harmless microchip from any and all damages, claims, suits, or expenses resulting from such use. no licenses are conveyed, implicitly or otherwise, under any microchip intellectual property rights. trademarks the microchip name and logo, the microchip logo, dspic, flashflex, k ee l oq , k ee l oq logo, mplab, pic, picmicro, picstart, pic 32 logo, rfpic, sst, sst logo, superflash and uni/o are registered trademarks of microchip technology incorporated in the u.s.a. and other countries. filterlab, hampshire, hi-tech c, linear active thermistor, mtp, seeval and the embedded control solutions company are registered trademarks of microchip technology incorporated in the u.s.a. silicon storage technology is a registered trademark of microchip technology inc. in other countries. analog-for-the-digital age, app lication maestro, bodycom, chipkit, chipkit logo, codeguard, dspicdem, dspicdem.net, dspicworks, dsspeak, ecan, economonitor, fansense, hi-tide, in-circuit serial programming, icsp, mindi, miwi, mpasm, mpf, mplab certified logo, mplib, mplink, mtouch, omniscient code generation, picc, picc-18, picdem, picdem.net, pickit, pictail, real ice, rflab, select mode, sqi, serial quad i/o, total endurance, tsharc, uniwindriver, wiperlock, zena and z-scale are trademarks of microchip technology incorporated in the u.s.a. and other countries. sqtp is a service mark of microchip technology incorporated in the u.s.a. gestic and ulpp are registered trademarks of microchip technology germany ii gmbh & co. & kg, a subsidiary of microchip technology inc., in other countries. all other trademarks mentioned herein are property of their respective companies. ? 2001-2012, microchip technology incorporated, printed in the u.s.a., all rights reserved. printed on recycled paper. isbn: 9781620768235 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-16949:2009 certification for its worldwide headquarters, design and wafer fabrication facilities in chandler and tempe, arizona; gresham, oregon and design centers in california and india. the company?s quality system processes and procedures are for its pic ? mcus and dspic ? dscs, 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. quality management s ystem certified by dnv == iso/ts 16949 ==
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