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low cost, 2.7 v to 5. 5 v, pin-selectable temperature switches in sot-23 ADT6401/adt6402 rev. 0 information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781.329.4700 www.analog.com fax: 781.461.3113 ?2008 analog devices, inc. all rights reserved. features 0.5c (typical) threshold accuracy pin-selectable trip points from ?45c to +5c in 10c increments (undertemperature) 45c to 115c in 10c increments (overtemperature) maximum operating temperature of 125c open-drain output (ADT6401) push-pull output (adt6402) pin-selectable hysteresis of 2c and 10c supply current of 30 a (typical) space-saving, 6-lead sot-23 package applications medical equipment automotive cell phones hard disk drives personal computers electronic test equipment domestic appliances process control functional block diagram 2oc/10oc v cc 4 gnd 5 tover/tunder 6 trip point and hysteresis decoding ADT6401 comparator - temperature-to- digital converter s 2 1 s 1 2 s 0 3 07415-001 figure 1. general description the ADT6401/adt6402 are trip point temperature switches available in a 6-lead sot-23 package. each part contains an internal band gap temperature sensor for local temperature sensing. when the temperature crosses the trip point setting, the logic output is activated. the ADT6401 logic output is active low and open-drain. the adt6402 logic output is active high and push-pull. the temperature is digitized to a resolution of 0.125c (11-bit). the pin-selectable trip point settings are 10c apart starting from ?45c to +5c for undertemperature switching, and from 45c to 115c for overtemperature switching. these devices typically consume 30 a of supply current. hystere- sis is pin selectable at 2c and 10c. the temperature switch is specified to operate over the supply range of 2.7 v to 5.5 v. when the ADT6401/adt6402 are used for monitoring tempera- tures from 45c to 115c, the logic output pin becomes active when the temperature goes higher than the selected trip point temperature. when the ADT6401/adt6402 are used for monitoring tempera- tures from ?45c to +5c, the logic output pin becomes active when the temperature goes lower than the selected trip point temperature. product highlights 1. - based temperature measurement gives high accuracy and noise immunity. 2. wide operating temperature range from ?55c to +125c. 3. 0.5c typical accuracy from ?45c to +115c. 4. pin-selectable threshold settings from ?45c to +115c in 10c increments. 5. supply voltage is 2.7 v to 5.5 v. 6. supply current of 30 a. 7. space-saving, 6-lead sot-23 package. 8. pin-selectable temperature hysteresis of 2c or 10c. 9. temperature resolution of 0.125c. www.datasheet.net/ datasheet pdf - http://www..co.kr/
ADT6401/adt6402 rev. 0 | page 2 of 12 table of contents features .............................................................................................. 1 ? applications ....................................................................................... 1 ? functional block diagram .............................................................. 1 ? general description ......................................................................... 1 ? product highlights ........................................................................... 1 ? revision history ............................................................................... 2 ? specifications ..................................................................................... 3 ? absolute maximum ratings ............................................................ 4 ? esd caution .................................................................................. 4 ? pin configurations and function descriptions ........................... 5 ? typical performance characteristics ............................................. 6 ? typical application circuits ............................................................ 8 ? theory of operation .........................................................................9 ? circuit information .......................................................................9 ? converter details ..........................................................................9 ? pin-selectable trip point and hysteresis ...................................9 ? temperature conversion ........................................................... 10 ? applications information .............................................................. 11 ? thermal response time ........................................................... 11 ? self-heating effects .................................................................... 11 ? supply decoupling ..................................................................... 11 ? temperature monitoring ........................................................... 11 ? outline dimensions ....................................................................... 12 ? ordering guide .......................................................................... 12 ? revision history 5 /08revision 0: initial version www.datasheet.net/ datasheet pdf - http://www..co.kr/
ADT6401/adt6402 rev. 0 | page 3 of 12 specifications t a = ?55c to +125c, v cc = 2.7 v to 5.5 v, open-drain r pull-up = 10 k, unless otherwise noted. table 1. parameter min typ max unit test conditions/comments temperature sensor and adc threshold accuracy 0.5 6 c t a = ?45c to ?25c 0.5 4 c t a = ?15c to +15c 0.5 4 c t a = 35c to 65c 0.5 6 c t a = 75c to 115c adc resolution 11 bits temperature conversion time 30 ms time necessary to complete a conversion update rate 600 ms conversion started every 600 ms temperature threshold hysteresis 2 c pin selectable, depends on s0, s1, s2 settings 10 c pin selectable, depends on s0, s1, s2 settings digital output (open-drain) output high current, i oh 10 na leakage current, v cc = 2.7 v and v oh = 5.5 v output low voltage, v ol 0.3 v i ol = 1.2 ma, v cc = 2.7 v 0.4 v i ol = 3.2 ma, v cc = 4.5 v output capacitance, c out 1 10 pf r pull-up = 10 k digital output (push-pull) output low voltage, v ol 0.3 v i ol = 1.2 ma, v cc = 2.7 v 0.4 v i ol = 3.2 ma, v cc = 4.5 v output high voltage, v oh 0.8 v cc v i source = 500 a, v cc = 2.7 v v cc ? 1.5 v i source = 800 a, v cc = 4.5 v output capacitance, c out 1 10 pf power requirements supply voltage 2.7 5.5 v supply current 30 50 a 1 guaranteed by design and characterization. www.datasheet.net/ datasheet pdf - http://www..co.kr/
ADT6401/adt6402 rev. 0 | page 4 of 12 absolute maximum ratings table 2. parameter rating v cc to gnd ?0.3 v to +7 v s0, s1, s2 input voltage to gnd ?0.3 v to v cc + 0.3 v open-drain output voltage to gnd ?0.3 v to +7 v push-pull output voltage to gnd ?0.3 v to v cc + 0.3 v input current on all pins 20 ma output current on all pins 20 ma esd rating (hbm) 1.5 kv operating temperature range ?55c to +125c storage temperature range ?65c to +160c maximum junction temperature, t jmax 150.7c 6-lead sot-23 (rj-6) power dissipation 1 w max = (t jmax ? t a 2 )/ ja thermal impedance 3 ja , junction-to-ambient (still air) 229.6c/w ir reflow soldering (rohs-compliant package) peak temperature 260c (+0c) time at peak temperature 20 sec to 40 sec ramp-up rate 3c/sec maximum ramp-down rate ?6c/sec maximum time 25c to peak temperature 8 minute maximum 1 values relate to package being used on a standard 2-layer pcb, which gives a worst-case ja . refer to figure 2 for a plot of maximum power dissipation vs. ambient temperature (t a ). 2 t a = ambient temperature. 3 junction-to-case resistance is applicable to components featuring a preferential flow direction, for example, components mounted on a heat sink. junction-to-ambient resistan ce is more useful for air-cooled, pcb-mounted components. stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. 0.9 0 125 temperature (c) maximum power dissipation (w) 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 ?55 ?50 ?40 ?30 ?20 ?10 0 10 20 30 40 50 60 70 80 90 100 110 120 sot-23 pd @ 125c = 0.107w 0 7415-002 figure 2. sot-23 maximum power dissipation vs. temperature esd caution www.datasheet.net/ datasheet pdf - http://www..co.kr/
ADT6401/adt6402 rev. 0 | page 5 of 12 pin configurations and function descriptions s2 1 s1 2 s0 3 tover/tunder 6 gnd 5 v cc 4 ADT6401 top view (not to scale) 07415-003 figure 3. ADT6401 pin configuration s 2 1 s 1 2 s 0 3 tover/tunder 6 gnd 5 v cc 4 adt6402 top view (not to scale) 07415-004 figure 4. adt6402 pin configuration table 3. pin function descriptions pin number ADT6401 adt6402 mnemonic description 1 1 s2 select pin for trip point and hysteresis values. 2 2 s1 select pin for trip point and hysteresis values. 3 3 s0 select pin for trip point and hysteresis values. 4 4 v cc supply input (2.7 v to 5.5 v). 5 5 gnd ground. 6 n/a tover/tunder open-drain, active low output. pull-up resistor required. this pin goes low when the temperature of the part exceeds the pin-selectable threshold. n/a 6 tover/tunder push-pull, active high output. this pin go es high when the temperature of the part exceeds the pin-selectable threshold. www.datasheet.net/ datasheet pdf - http://www..co.kr/
ADT6401/adt6402 rev. 0 | page 6 of 12 typical performance characteristics 35 0 ?0.5 temperature accuracy (c) percentage of parts sampled (%) 30 25 20 15 10 5 ?0.4 ?0.3 ?0.2 ?0.1 0.1 0.2 0.3 0.4 0.5 sample size = 300 07415-015 figure 5. trip threshold accuracy 45 0 temperature (c) i cc (a) 40 35 30 25 20 15 10 5 ?60 ?40 ?20 0 20 40 60 80 100 120 140 3.3v 5v 07415-016 figure 6. operating supply current vs. temperature 180 0 ?80 ?60 ?40 ?20 0 20 40 60 80 100 120 temperature (c) output source resistance ( ? ) 160 140 120 100 80 60 40 20 140 5.5v 3.3v 2.7v 07415-017 figure 7. adt6402 output source resistance vs. temperature ?80 ?60 ?40 ?20 0 20 40 60 80 100 120 140 80 0 temperature (c) output sink resistance ( ? ) 5.5v 3.3v 2.7v 70 60 50 40 30 20 10 07415-018 figure 8. output sink re sistance vs. temperature 120 0 time (s) temperature (c) 0 12.8 100 80 60 40 20 0.8 1.6 2.4 3.2 4.0 4.8 5.6 6.4 7.2 8.0 8.8 9.6 10.4 11.2 12.0 07415-019 figure 9. thermal step response in perfluorinated fluid 140 0 time (s) temperature (c) 0 120 100 80 60 40 20 3.6 7.2 10.8 14.4 18.0 21.6 25.2 28.8 32.4 36.0 39.6 43.2 46.8 50.4 54.0 57.6 61.2 07415-020 figure 10. thermal step response in still air www.datasheet.net/ datasheet pdf - http://www..co.kr/
ADT6401/adt6402 rev. 0 | page 7 of 12 11 0 ?60 ?50 ?40 ?30 ?20 ?10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 temperature (c) hysteresis (c) 10 8 6 4 2 9 7 5 3 1 07415-021 10c 2c v dd = 3.3v figure 11. hysteresis vs. trip temperature ch1 2.0v ch2 2.0v m 10.0s 50.0ms/s 20.0ns/pt a ch1 1.68v 2 1 tover v cc 07415-022 figure 12. ADT6401 start-up and power-down delay ch1 2.0v ch2 2.0v m 10.0ms 50.0ks/s 20.0s/pt a ch1 1.68v 2 1 tover v cc 07415-023 figure 13. ADT6401 start-up delay 45 0 2.4 5.6 v cc (v) i cc (a) 40 35 30 25 20 15 10 5 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4 ?40oc ?10oc +25oc +75oc +120oc 07415-024 figure 14. operating supply current vs. voltage over temperature www.datasheet.net/ datasheet pdf - http://www..co.kr/
ADT6401/adt6402 rev. 0 | page 8 of 12 typical application circuits v cc s2 gnd trip point = 95c hysteresis = 2c int tover ADT6401 v cc microprocessor gnd s1 s0 0.1f 100k ? 3.3 v 07415-011 figure 15. microprocessor alarm v cc gnd tover adt6402 0.1f 3.3 v 12 v s2 s1 s0 trip point = 65c hysteresis = 10c 07415-012 figure 16. overtemperature fan control v cc gnd tunder adt6402 0.1f v cc gnd tover adt6402 0.1f 3.3 v over temperature under temperature out of range s2 s1 s0 s2 s1 s0 trip point = +105c hysteresis = +2c trip point = ?35c hysteresis = +2c 07415-013 figure 17. temperature window alarms www.datasheet.net/ datasheet pdf - http://www..co.kr/
ADT6401/adt6402 rev. 0 | page 9 of 12 theory of operation circuit information the ADT6401/adt6402 are 11-bit digital temperature sensors with a 12 th bit acting as the sign bit. an on-board temperature sensor generates a voltage precisely proportional to absolute temperature, which is compared to an internal voltage reference and input to a precision digital modulator. the 12-bit output from the modulator is input into a digital comparator, where it is compared with a pin-selectable trip level. the output trip pin is activated if the temperature measured is greater than, or less than, the pin-selectable trip level. overall accuracy for the ADT6401/ adt6402 is 6c (maximum) from ?45c to +115c. the on-board temperature sensor has excellent accuracy and linearity over the entire rated temperature range without needing correction or calibration by the user. the ADT6401 has active low, open-drain output structures that can sink current. the adt6402 has active high, push-pull output structures that can sink and source current. on power-up, the output becomes active when the first conversion is completed, which typically takes 30 ms. the sensor output is digitized by a first-order, - modulator, also known as the charge balance type analog-to-digital converter (adc). this type of converter utilizes time domain oversampling and a high accuracy comparator to deliver 11 bits of effective accuracy in an extremely compact circuit. converter details the - modulator consists of an input sampler, a summing network, an integrator, a comparator, and a 1-bit digital-to- analog converter (dac). similar to the voltage-to-frequency converter, this architecture creates a negative feedback loop and minimizes the integrator output by changing the duty cycle of the comparator output in response to input voltage changes. the comparator samples the output of the integrator at a much higher rate than the input sampling frequency; this is called oversampling. oversampling spreads the quantization noise over a much wider band than that of the input signal, improving overall noise performance and increasing accuracy. pin-selectable trip point and hysteresis the temperature trip point and hysteresis values for the ADT6401/adt6402 are selected using pin s0, pin s1, and pin s2. these three pins can be connected to v cc , tied to gnd, or left floating. the ADT6401/adt6402 decode the inputs on s0, s1, and s2 to determine the temperature trip point and hysteresis value, as outlined in table 4. the ADT6401 overtemperature/undertemperature output is intended to interface to reset inputs of microprocessors. the adt6402 is intended for driving circuits of applications, such as fan control circuits. table 4. selecting trip points and hysteresis 1 s2 s1 s0 temperature trip point hysteresis 0 0 0 +45c 2c 0 0 1 +55c 2c 0 0 float +65c 2c 0 1 0 +75c 2c 0 1 1 +85c 2c 0 0 float +95c 2c 0 float 0 +105c 2c 0 float 1 +115c 2c 1 float float +55c 10c 1 0 0 +65c 10c 1 0 1 +75c 10c 1 0 float +85c 10c 1 1 0 +95c 10c 1 1 1 +105c 10c 1 1 float +115c 10c 1 float 0 +5c 2c 1 float 1 ?5c 2c 1 float float ?15c 2c float 0 0 ?25c 2c float 0 1 ?35c 2c float 0 float ?45c 2c float 1 0 +5c 10c float 1 1 ?5c 10c float 1 float ?15c 10c float float 0 ?25c 10c float float 1 ?35c 10c float float float ?45c 10c 1 0 = pin tied to gnd, 1 = pin tied to v cc , float = pin left floating. www.datasheet.net/ datasheet pdf - http://www..co.kr/
ADT6401/adt6402 rev. 0 | page 10 of 12 hysteresis a hysteresis value of 2c or 10c can be selected. the digital comparator ensures excellent accuracy for the hysteresis value. hysteresis prevents oscillation on the output pin when the temperature is approaching the trip point and after the output pin is activated. for example, if the temperature trip is 45c and the hysteresis selected is 10c, the temperature must go as low as 35c before the output deactivates. temperature conversion the conversion clock for the part is generated internally. no external clock is required. the internal clock oscillator runs an automatic conversion sequence. during this automatic conversion sequence, a conversion is initiated every 600 ms. at this time, the part powers up its analog circuitry and performs a temperature conversion. this temperature conversion typically takes 30 ms, after which the analog circuitry of the part automatically shuts down. the analog circuitry powers up again 570 ms later, when the 600 ms timer times out and the next conversion begins. the result of the most recent temperature conversion is compared with the factory-set trip point value. if the temperature measured is greater than the trip point value, the output is activated. the output is deactivated once the temperature crosses back over the trip point threshold, plus whatever temperature hysteresis is selected. figure 18 to figure 21 show the transfer function for the output trip pin of each generic model. tth temp tover v 2c hysteresis 10c hysteresis cold hot 07415-006 figure 18. ADT6401 tover transfer function tth temp t ove r v 2c hysteresis 10c hysteresis cold hot 07415-007 figure 19. adt6402 tover transfer function tth temp tunde r v cold hot 10c hysteresis 2c hysteresis 07415-008 figure 20. ADT6401 tunder transfer function tth temp v cold hot tunder 10c hysteresis 2c hysteresis 07415-009 figure 21. adt6402 tunder transfer function www.datasheet.net/ datasheet pdf - http://www..co.kr/
ADT6401/adt6402 rev. 0 | page 11 of 12 applications information thermal response time the time required for a temperature sensor to settle to a specified accuracy is a function of the thermal mass of the sensor and the thermal conductivity between the sensor and the object being sensed. thermal mass is often considered equivalent to capacitance. thermal conductivity is commonly specified using the symbol q and can be thought of as thermal resistance. it is commonly specified in units of degrees per watt of power transferred across the thermal joint. thus, the time required for the ADT6401/adt6402 to settle to the desired accuracy is dependent on the characteristics of the sot-23 package, the thermal contact established in that particular application, and the equivalent power of the heat source. in most applications, the settling time is best determined empirically. self-heating effects the temperature measurement accuracy of the ADT6401/ adt6402 can be degraded in some applications due to self- heating. errors can be introduced from the quiescent dissipation and power dissipated when converting. the magnitude of these temperature errors depends on the thermal conductivity of the ADT6401/adt6402 package, the mounting technique, and the effects of airflow. at 25c, static dissipation in the ADT6401/ adt6402 is typically 99 w operating at 3.3 v. in the 6-lead sot-23 package mounted in free air, this accounts for a tempera- ture increase due to self-heating of t = p diss ja = 99 w 240c/w = 0.024c it is recommended that current dissipated through the device be kept to a minimum because it has a proportional effect on the temperature error. supply decoupling the ADT6401/adt6402 should be decoupled with a 0.1 f ceramic capacitor between v cc and gnd. this is particularly important when the ADT6401/adt6402 are mounted remotely from the power supply. precision analog products such as the ADT6401/adt6402 require well-filtered power sources. because the ADT6401/adt6402 operate from a single supply, it may seem convenient to tap into the digital logic power supply. unfortunately, the logic supply is often a switch-mode design, which generates noise in the 20 khz to 1 mhz range. in addition, fast logic gates can generate glitches that are hundreds of millivolts in amplitude due to wiring resistance and inductance. if possible, the ADT6401/adt6402 should be powered directly from the system power supply. this arrangement, shown in figure 22, isolates the analog section from the logic-switching transients. even if a separate power supply trace is not available, generous supply bypassing reduces supply line induced errors. local supply bypassing consisting of a 0.1 f ceramic capacitor is advisable to achieve the temperature accuracy specifications. this decoupling capacitor must be placed as close as possible to the ADT6401/adt6402 v cc pin. 0.1 f ttl/cmos logic circuits power supply ADT6401/ adt6402 07415-010 figure 22. separate traces used to reduce power supply noise temperature monitoring the ADT6401/adt6402 are ideal for monitoring the thermal environment within electronic equipment. for example, the surface-mount package accurately reflects the exact thermal conditions that affect nearby integrated circuits. the ADT6401/adt6402 measure and convert the temperature at the surface of its own semiconductor chip. when the ADT6401/ adt6402 are used to measure the temperature of a nearby heat source, the thermal impedance between the heat source and the ADT6401/adt6402 must be as low as possible. as much as 60% of the heat transferred from the heat source to the thermal sensor on the ADT6401/adt6402 die is discharged via the copper tracks, package pins, and bond pads. of the pins on the ADT6401/adt6402, the gnd pin transfers most of the heat. therefore, to monitor the temperature of a heat source, it is recommended that the thermal resistance between the ADT6401/ adt6402 gnd pin and the gnd of the heat source be reduced as much as possible. for example, the unique properties of the ADT6401/adt6402 can be used to monitor a high power dissipation microproces- sor. the ADT6401/adt6402 device in its sot-23 package is mounted directly beneath the pin grid array (pga) package of the microprocessor. the ADT6401/adt6402 require no external characterization. www.datasheet.net/ datasheet pdf - http://www..co.kr/
ADT6401/adt6402 rev. 0 | page 12 of 12 outline dimensions 1 3 4 5 2 6 2.90 bsc 1.60 bsc 2.80 bsc 1.90 bsc 0.95 bsc 0.22 0.08 10 4 0 0.50 0.30 0.15 max 1.30 1.15 0.90 seating plane 1.45 max 0.60 0.45 0.30 pin 1 indicator compliant to jedec standards mo-178-ab figure 23. 6-lead small outline transistor package [sot-23] (rj-6) dimensions shown in millimeters ordering guide model temperature range package description package option ordering quantity branding ADT6401srjz-rl7 1 ?55c to +125c 6-lead sot-23 rj-6 3,000 t30 adt6402srjz-rl7 1 ?55c to +125c 6-lead sot-23 rj-6 3,000 t32 1 z = rohs compliant part. ?2008 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. d07415-0-5 /08(0) www.datasheet.net/ datasheet pdf - http://www..co.kr/

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