www.fairchildsemi.com rev. 1.0.5 7/29/02 features precision calibrated to ?? (typical) temperature range: -40? to 125? extremely linear output ramp (10mv/?) output ramp is calibrated in degrees celsius low operating current <130? (no load) low self heating (0.2? max in still air) operating voltage range: +2.7v to 6.0v uses a single positive supply non-linearity 0.8? applications mobile phones mobile communications terminals computers battery management fax machines/printers/copiers portable medical instruments ?vac power supply modules disk drives automotive control circuits description as a high-precision cmos temperature sensor, the FM50 is a cost-effective solution for high-accuracy low-power temperature monitoring applications. output voltage versus temperature is extremely linear, with a slope of 10mv/?. typically accuracy is ?? over a -40? to 125? temperature range and ?.5? at room temperature. no calibration is required. all ports are calibrated during assembly and test. package is a 3-pin surface mount sot-23. thermal response FM50 low voltage sot-23 temperature sensor -50 -40 -25 25 50 75 100 125 100 v out (mv) temperature ( c) 0 temperature ( c) = v out - 500 mv 10 mv/ c 500 1750 750 FM50 output voltage vs. temperature
FM50 product specification 2 rev. 1.0.5 7/29/02 pin assignments pin descriptions pin name pin no. type function v out 2 analog output temperature sense. analog output voltage indicating temperature. v out = 500+10t(?) mv v dd 1power supply voltage. 2.4 to 6.0v gnd 3 power ground. FM50 v out v dd gnd 12 3
product specification FM50 rev. 1.0.5 7/29/02 3 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. operating ratings are conditions for which the device is intended to be functional without specific guaranteed performance limits. for guaranteed specifications and test conditions refer to electrical characteristics. 3. human body model: 100pf capacitor discharged through a 1.5kohm resistor into each pin. machine model: 200pf capacitor discharged directly into each pin. electrical characteristics 4 limits apply for -40 c t a +125 c and v dd = +5.0v unless otherwise noted. notes: 4. these specifications are guaranteed only for the test conditions listed. 5. accuracy (expressed in c) = difference between calculated output voltage and measured output voltage. calculated output voltage = 10mv/ c multiplied by the device s case temperature at specified conditions of temperature, voltage and power supply, added to 500mv. 6. non-linearity is defined as the deviation of the output-voltage-versus-temperature curve from the best-fit straight line, ov er the device s rated temperature range. parameter min. typ. max. units supply voltage +7 v output voltage v dd + 0.5 v output current 10 a operating temperature range 2 -50 +150 c storage temperature range -60 +150 c lead soldering temperature 220 c esd 2 human body model machine model 2000 250 v v parameter symbol conditions min typ max units accuracy 5 t a = +25 c t a = -40 c (t min ) t a = +125 c (t max ) -1 -3 -3 0.5 1 1 +1 +3 +3 c c c non-linearity 6 -0.8 +0.8 c supply voltage v dd +2.7 +6.0 v supply current i s output floating; t a = +25 c 130 a output sink capability i ol +2.7v < v dd < +6.0v 50 a output source capability i oh +2.7v < v dd < +6.0v 25 a average output slope (sensor gain) a out 9.8 10 10.2 mv/ c room temperature output v out25 t a = +25 c 740 760 mv
FM50 product specification 4 rev. 1.0.5 7/29/02 typical performance characteristics figure 1. accuracy vs. temperature figure 2. typical idd versus temperature figure 3. typical sensitivity to supply voltage applications information application diagram -4.0 -3.0 -2.0 -1.0 0.0 1.0 2.0 3.0 4.0 -50 150 50 0 100 upper spec limit lower spec limit v dd = +5v temperature (c) acc ura cy ( c) -1.0 0.0 1.0 2.0 3.0 4.0 5.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 vdd volts vout deviation from 5v value (mv) 0.0 20.0 40.0 60.0 80.0 100.0 120.0 140.0 -50 -30 -10 10 30 50 70 90 110 130 temperature ( c) supply current (ua) FM50 gnd v dd v out analog to digital converter mounting the FM50 can be easily mounted by gluing or cementing it to a surface. in this case, its temperature will be within about 0.2? of the temperature of the surface it is attached to if the ambient air temperature is almost the same as the surface temperature. if the air temperature is much higher or lower than the surface temperature, the actual temperature of the FM50 die will be at an intermediate temperature between the surface temperature and the air temperature. to ensure good thermal conductivity, the backside of the FM50 die is directly attached to the gnd pin. the lands and traces to the FM50 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 FM50 s temperature to deviate from the desired temperature. alternatively, the FM50 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 FM50 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 FM50 or its connections.
product specification FM50 rev. 1.0.5 7/29/02 5 typical applications circuits figure 4. serial output temperature to digital converter (full scale = +125 c) figure 5. parallel output temperature to digital converter (full scale = +125 c) serial analog-to-digital converter adjustable shunt voltage reference FM50 u1 v temp 3.9k in ref 1.75v u3 u2 fb 10k 100k 1 f serial data o u t clock enable parallel output analog-to-digital converter FM50 u1 v temp 1.75v 5v in v ref u3 8 u2 + - 15k 30k 5k 1 f parallel data output wr rd cs intr
FM50 product specification 6 rev. 1.0.5 7/29/02 typical applications (continued) figure 6. thermostat/fan controller FM50 v out v t v temp u1 + - r2 u3 v+ v+ r4 shunt voltage reference 4.1v u2 r3 r1 0.1 f
product specification FM50 rev. 1.0.5 7/29/02 7 mechanical dimensions inches (millimeters) unless otherwise noted sot-23 fs package code au pin 1 0.0005 (0.013) 0.004 (0.100) 0.015 (0.370) 0.020 (0.510) 0.083 (2.100) 0.104 (2.640) 0.047 (1.20) 0.055 (1.40) 0.035 (0.890) 0.041 (1.030) seating plane 10 0 0.015 (0.085) 0.007 (0.180) 0.0217 ref (0.55) ref 0.035 (0.890) 0.044 (1.120) 0.110 (2.800) 0.120 (3.040) 0.070 (1.780) 0.081 (2.050) 0.017 (0.450) 0.024 (0.600)
FM50 product specification 7/29/02 0.0m 003 stock#ds30000050 ? 2002 fairchild semiconductor corporation life support policy fairchild s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. ordering information part number package temperature range shipping FM50s3x 3-pin sot-23 -40 c to +125 c tape and reel, 3000 units/reel
|
