new release specification ? andigilog, inc. 2003 www.andigilog.com 70a03201-004 l ow - v oltage u ltra -l ow -p ower t emperature s ensor ATS20 p roduct s pecification general description the ATS20 is a precision cmos temperature sensor that provides a cost-effective solution for space- constrained applications. t he output voltage ramp of the ATS20 has a negative slo pe of -11.77mv/c. with a supply voltage of 2.4v to 6v, the ATS20 is accurate to 2c at 25c, and to 3c over the range of ? 40c to 125c. reducing the supply voltage to 2.4v does not change the negative a nd positive temperature extremes. as well, the ATS20 does not require external calibration. calibration of each device is performed at the factory. features ? extremely low power ? precision calibrated to 2c at 25c ? ultra low operating current : 12 a ? temperature range: -40c to 125c ? linear output ramp: -11.77mv/c ? output ramp is calibrated to degrees celsius ? low self heating: 0.01c typical in still air ? uses a single positive supply ? operating voltage range: +2.4v to +6v ? non-linearity: 0.8 c applications ? cellular telephones ? computers ? battery management ? fax machines/printers/copiers ? portable medical instruments ? hvac ? power supply modules ? disk drives ? appliances pin configuration 5 3 4 1 2 sc70 5 -lead ATS20 v dd gnd nc gnd v out 5 3 4 1 2 sc70 5 -lead v dd gnd nc gnd v out 5 3 4 1 2 sc70 5 -lead ATS20 v dd gnd nc gnd v out 5 3 4 1 2 sc70 5 -lead v dd gnd nc gnd v out actual part marking below accuracy vs temperature accuracy (c) -3 -2 -1 0 1 2 3 upper spec limit 0 80 100 lower spec limit - - - 25 120 125 604020 -20-40 accuracy (c) -3 -2 -1 0 1 2 3 upper spec limit 0 80 100 lower spec limit - - - 25 120 125 604020 -20-40 ordering information part number package temperature range part marking how supplied ATS20f5 5-pin sc-70 -40 ?c to +125 ? c ayw 3000 units on t&r y ? year, w - week
- 2 - ? andigilog, inc. 2003 www.andigilog.com 70a03201-004 ATS20 absolute maximum ratings 1 notes: 1. absolute maximum ratings are limits beyond which operation may cause permanent damage to the device. these are stress ratings only; functional operation at or above these limits is not implied. 2. human body model: 100pf capacitor discharged through a 1.5k resistor into each pin. machine model: 200pf capacitor discharged directly into each pin. 3. these specifications are guaranteed only for the test conditions listed. recommended operating ratings symbol parameter min max units v dd supply voltage +2.4 +6 v v out output voltage 0 v dd v t a operating temperatur e range -40 +125 c electrical characteristics 3 limits apply for - 55c t a +130c and v dd = + 3 .0v unless otherwise noted. parameter symbol conditions min typ max units accuracy 4 t a =+25c t a =-40c (t min ) t a =+125c (t max ) -2 -3 -3 1 2 2 +2 +3 +3 c c c non-linearity 5 1 c supply current - output floating i dd -40c t a +125c 9 12 a output sink capability 6,7 i ol v dd = +3v 20 a output source capability 6,7 i oh v dd = +3v 1 a average output slope (sensor gain) a out -11.77 mv/c output voltage v out t a =0c +1863.9 mv self heating 8 sc-70-5 0.01043 c notes: 4. accuracy (expressed in c) = difference between calculated output voltage and m easured output voltage. calculated output voltage = -11.77mv/c multiplied by device?s case te mperature at specif ied conditions of temperature, voltage and power supply plus an offset of 1863.9mv at 0c. 5. non-linearity is defined as the deviation of the output-voltage-versus-temperature curve from the best-fit straight line, over the device?s rat ed temperature range. 6. lowest output current should be targeted; higher currents result in more self-heating of the device. 7. higher capacitive loads may be driven by the output in a static mode, but it may requir e a delay time before initial read at power up to allow charging of the capacitor. 8. max self heating = ja x (v dd x i dd ). assumes a capacitive load. parameter rating supply voltage +7v output voltage v dd + 0.5v continuous current, any terminal 10ma storage temperature range -60c to +150c human body model 2000v esd 3 machine model 250v thermal resistance - ja 331c /w vapor phase (60 sec) 260c lead temp infrared (15 sec) 220c
- 3 - ? andigilog, inc. 2003 www.andigilog.com 70a03201-004 ATS20 figure 1. ATS20 output voltage vs. temperature 25 50 75 100 125 -20 0 1500 100 v out (mv) temperature (oc) temp (oc) = (v out ?1863.9mv) / -11.77mv/oc 2000 500 1000 2333.7 -40 1863.9 0 1569.7 25 686.9 100 392.7 125 v out (mv) temp ( o c) -40 25 50 75 100 125 -20 0 1500 100 v out (mv) temperature (oc) temp (oc) = (v out ?1863.9mv) / -11.77mv/oc 2000 500 1000 2333.7 -40 1863.9 0 1569.7 25 686.9 100 392.7 125 v out (mv) temp ( o c) -40 mounting the ATS20 can be easily mounted by gluing or cementing it to a surface. in this case, its temperature will be within about 0.01c of the temperature of the surface it is attached to if the ambient air temperature is almost the same as the surf ace temperature. if the air temperature is much higher or lower than the surface temperature, the actual tem perature of the ATS20 die will be at an intermediate temperature between the surface temperature and the air temperature. to ensure good thermal conductivity, the backside of the ATS20 die is directly attached to the gnd pin. the lands and traces to the ATS20 will , of course, be part of the printed circuit board, which is the object whose temperature is being measured. these printed circuit board lands and traces will not cause the ATS20?s temperature to deviate from the desired temperature. alternatively, the ATS20 can be mounted inside a sealed- end metal tube, and can then be dipped into a bath or screwed into a threaded hole in a tank. as with any ic, the ATS20 and accompanying wiring and circuits must be kept insulated and dry to avoid leakage and corrosion. this is especially true if the circuit may operate at cold temperatures where condensa tion can occur. printed- circuit coatings and varnishes such as humiseal and epoxy paint or dips can be used to ensure that moisture cannot corrode the ATS20 or its connections.
- 4 - ? andigilog, inc. 2003 www.andigilog.com 70a03201-004 ATS20 performance characteristics accuracy (c) -3 -2 -1 0 1 2 3 upper spec limit 0 80 100 lower spec limit - - - 25 120 125 60 figure 2. ATS20 accuracy range vs temperature i dd ( ma) 6 7 8 9 10 11 12 -50 -25 0 25 50 75 100 125 temperature (c) v dd =+3v 0 1 2 3 4 5 i dd ( ma) 6 7 8 9 10 11 12 -50 -25 0 25 50 75 100 125 -50 -25 0 25 50 75 100 125 temperature (c) v dd =+3v 0 1 2 3 4 5 figure 3. ats current vs temperature i dd (a) 40 20 -20-40 accuracy (c) -3 -2 -1 0 1 2 3 upper spec limit 0 80 100 lower spec limit - - - 25 120 125 60 20 -20-40 40
- 5 - ? andigilog, inc. 2003 www.andigilog.com 70a03201-004 ATS20 typical applications in 10k 100k 1 f fb 1.75v ref 3.9k serial data out clock enable ATS20 3v v temp serial analog-to-digital converter adjustable shunt voltage reference + note: the full scale of the a-to-d converter will typically be limited to +125 ? c simply by the number of bits available in the conversion. the ATS20 would still be capable of its full output swing. figure 4. serial output temperature to digital converter 3v wr 5k 30k in v ref 1.75v 15k 1 f + _ parallel data output intr cs rd 8 v temp parallel output analog-to-digital converter ATS20 figure 5. parallel output temperature to digital converter (full scale = +125 ?c)
- 6 - ? andigilog, inc. 2003 www.andigilog.com 70a03201-004 ATS20 typical applications (cont?d) figure 6. thermostat/fan controller analog to digital converter ATS20 0.1f bypass cap v dd gnd v out c filter r filter microcontroller analog to digital converter ATS20 0.1f bypass cap v dd gnd v out c filter r filter microcontroller figure 7. digital temperature output through a microcontroller shunt voltage reference r vd1 v ref r hyst v out v control + ? r vd2 v+ r v+ v+ 0.1 f v trip ATS20 v out v hyst1 v hyst2 v control note: v ref is set by the shunt voltage reference. for v control high is an alarm state or control for activating cooling/fan. (v ref ) ? (r vd2 ) r vd1 + (r vd2 ) ? (r hyst ) r hyst + r vd2 v hyst2 = (v ref ) ? (r vd2 ) r vd2 + (r vd1 ) ? (r hyst ) r hyst + r vd1 v hyst1 =
- 7 - ? andigilog, inc. 2003 www.andigilog.com 70a03201-004 ATS20 loading the ATS20 will handle sizable capacitive loads up to 300pf without any special considerations. in an extremely noisy environment it may be advisable to add some filtering to minimize noise in the output voltage. it is also recommended that a 0.1f bypass capacitor be added between the supply voltage and ground. this is due to the instant current demand caused by switching cmos transistors. normally it is unadvisable to put a sufficiently large supply (particularly in portable electronics) to be able to handle the dynamic currents of cmos transistors. it is a much simpler solution to use a bypass capacitor to sustain the supply voltage during this short demand period. in environments that are part icularly noisy it may be necessary to add a low-pass f ilter network to the output of the device. as shown in figure 8, a 1f capacitor in addition to the output impedance of the device and a 200 series resistor for a low-pass filter that will pass the slow thermal time constant of the ATS20, while filtering the higher frequency noise. the response time of the ATS20 can be affected by this filter network, therefore values for c filter < 1500pf are recommended . ATS20 0.1f bypass cap v dd gnd v out c filter r filter c l 0.1f bypass cap v dd gnd v out c filter r filter c l ATS20 ATS20 ATS20 0.1f bypass cap v dd gnd v out c filter r filter c l 0.1f bypass cap v dd gnd v out c filter r filter c l ATS20 ATS20 resistor / capacitor combinations for figure 8 filter network r filter c filter 200 1 f 470 0.1 f 680 0.01 f 1000 1000 pf 10k 100pf 100k 10pf figure 8. ATS20 with filter network for noisy environments or for capacitive loads greater than 300pf
andigilog, inc. 8380 s. kyrene rd., suite 101 tempe, arizona 85284-2120 tel: (480) 940-6200 fax: (480) 940-4255 - 8 - ? andigilog, inc. 2003 www.andigilog.com 70a03201-004 ATS20 sc-70-5 package dimensions 1.15mm (min) 1.35mm (max) 1.80mm (min) 2.20mm (max) 0.00mm (min) 0.10mm (max) 0.10mm (min) 0.25mm (max) 0.80mm (min) 1.10mm (max) 0.10mm (min) 0.30mm (max) 2.00mm (min) 2.20mm (max) 0.30mm (min) 0.40mm (max) 0.65mm bsc 0.40mm (min) 0.65mm 0.65mm 1.9mm 0.50mm (min) tape and reel data w 8.1 0.20 mm a 0 2.25 0.10 mm b b 0 2.70 0.10 mm k 0 1.20 0.10 mm p 0 4.00 0.10 mm p 1 4.00 0.10 mm p 2 2.00 0.05 mm t 0.30 0.05 mm f 3.50 0.05 mm
andigilog, inc. 8380 s. kyrene rd., suite 101 tempe, arizona 85284-2120 tel: (480) 940-6200 fax: (480) 940-4255 - 9 - ? andigilog, inc. 2003 www.andigilog.com 70a03201-004 ATS20 data sheet classifications preliminary specification this classification is shown on the heading of each page of a specification for produc ts that are either under development(design and qualification), or in the formative planning stages. andigilog reserves the right to change or discontinue these products without notice. new release specification this classification is shown on the heading of the first page only of a specification for produc ts that are either under the later stages of development (characterization and qualification), or in the early weeks of release to production. andigilog reserves the right to change t he specification and information for these products without notice. fully released specification fully released datasheets do not contain any classification in the first page header. these documents contain specification on products that are in full production. andigilog will not change any guaranteed limits without written notice to the customers. obsolete datasheets that were written pr ior to january 1, 2001 without any header classification information should be considered as obsolete and non-active specifications, or in the best case as preliminary specifications.
andigilog, inc. 8380 s. kyrene rd., suite 101 tempe, arizona 85284-2120 tel: (480) 940-6200 fax: (480) 940-4255 - 10 - ? andigilog, inc. 2003 www.andigilog.com 70a03201-004 ATS20 notes:
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