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| FM50 Low Voltage SOT-23 Temperature Sensor April 2001 FM50 Low Voltage SOT-23 Temperature Sensor General Description The FM50 is a high-precision CMOS temperature sensor that provides a cost-effective solution for applications requiring highaccuracy low-power temperature monitoring. The FM50 output voltage ramp is extremely linear and has a slope of 10mV/C. It is typically accurate to 1C over a temperature range of -40C to 125C and has a typical room temperature accuracy of 0.5C. The output voltage characteristic for the FM50 is illustrated in Figure 1. The FM50 does not require external calibration. Factory calibration of the FM50 is performed using a low-cost trimming technique. The FM50 is available in 3-pin SOT-23 surface mount packages. I Low Operating Current <130A (no load) I Low Self Heating (0.2C Max in Still Air) I Operating Voltage Range: +2.7V to 6.0V I Uses a Single Positive Supply I Non-linearity 0.8C Applications I Mobile Phones I Mobile Communications Terminals I Computers I Battery Management I FAX Machines/Printers/Copiers I Portable Medical Instruments I HVAC I Power Supply Modules I Disk Drives I Automotive Control Circuits Features I Precision Calibrated to 1C (Typical) I Temperature Range: -40C to 125C I Extremely Linear Output Ramp (10mV/C) I Output Ramp is Calibrated in Degrees Celsius Typical Applications 3.9K VTEMP IN REF 1.75V Serial Analog-to-Digital Converter U3 FB 1F 10K Adjustable Shunt Voltage Reference U2 CLOCK SERIAL DATA OUT FM50 U1 100K ENABLE Serial Output Temperature to Digital Converter (Full Scale = +125C) (c) 2001 Fairchild Semiconductor Corporation FM50 Rev. C 1 www.fairchildsemi.com FM50 Low Voltage SOT-23 Temperature Sensor Typical Applications (continued) 5V 30K VTEMP U1 5K 1F + U2 1.75V VREF U3 CS RD 15K WR 8 IN Parallel Output Analog-to-Digital Converter PARALLEL DATA OUTPUT FM50 INTR Parallel Output Temperature to Digital Converter (Full Scale = +125C) V+ R3 R4 R1 4.1V Shunt Voltage Reference VT U1 VOUT U3 0.1F R2 + V+ FM50 U2 VTEMP Thermostat/ Fan Controller 2 FM50 Rev. C www.fairchildsemi.com FM50 Low Voltage SOT-23 Temperature Sensor Ordering Information Part Number FM50S3 Package 3-Pin SOT-23 Temperature Range -40C to +125C How Supplied 3000 units on T&R Absolute Maximum Ratings (Note 1) Parameter Supply Voltage Output Voltage Output Current Operating Temperature Range2 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. Rating +7V VDD + 0.5V 10mA -50C to +150C Storage Temperature Range Lead Soldering Temperature ESD3 Human Body Model Machine Model -60C to +150C 220C 2000V 250V Electrical Characteristics4 Limits apply for -40C TA +125C and VDD = +5.0V unless otherwise noted. Parameter Accuracy5 Symbol Conditions TA = +25C TA = -40C (TMIN) TA = +125C (TMAX) Min -1 -3 -3 -0.8 Typ 0.5 1 1 Max +1 +3 +3 +0.8 +6.0 130 Units C C C C V A A A Non-Linearity6 Supply Voltage Supply Current Output Sink Capability Output Source Capability Average Output Slope (Sensor Gain) Room Temperature Output Notes: 4. These specifications are guaranteed only for the test conditions listed. VDD IS IOL IOH AOUT VOUT25 TA = +25C Output floating; TA = +25C +2.7V < VDD < +6.0V +2.7V < VDD < +6.0V +2.7 50 25 9.2 740 10 10.2 760 mV/C mv 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, over the device's rated temperature range. 3 FM50 Rev. C www.fairchildsemi.com FM50 Low Voltage SOT-23 Temperature Sensor VOUT (mV) 1750 750 500 100 -50 -40 -25 0 25 50 75 100 125 Temperature ( C) Temperature ( C) = VOUT - 500 mV 10 mV/ C Figure 1. FM50 Output Voltage vs. Temperature Mounting The FM50 can be easily mounted by gluing or cementing it to a surface. In this case, its temperature will be within about 0.2C 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 condensation 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. 4 FM50 Rev. C www.fairchildsemi.com FM50 Low Voltage SOT-23 Temperature Sensor Typical Performance Characteristics Accuracy vs. Temperature 4.0 3.0 2.0 upper spec limit VDD = +5V Accuracy ( C) 1.0 0.0 -1.0 -2.0 -3.0 lower spec limit -4.0 -50 0 50 100 150 Temperature ( C) Pin Configuration SOT-23 (Top View) GND Application Diagram VDD FM50 GND Analog to Digital VOUT Converter FM50 VDD VOUT 5 FM50 Rev. C www.fairchildsemi.com FM50 Low Voltage SOT-23 Temperature Sensor Physical Dimensions inches (millimeters) unless otherwise noted 0.45~0.60 0.20 MIN 2.40 0.10 0.40 0.03 1.30 0.10 0.03~0.10 0.38 REF 0.40 0.03 0.96~1.14 2.90 0.10 0.12 -0.023 +0.05 0.95 0.03 0.95 0.03 1.90 0.03 0.508REF SOT-23 Package Dimensions FS Package Code AU 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 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 to the user. Fairchild Semiconductor Americas Customer Response Center Tel. 1-888-522-5372 Fairchild Semiconductor Europe Fax: +44 (0) 1793-856858 Deutsch Tel: +49 (0) 8141-6102-0 English Tel: +44 (0) 1793-856856 Francais Tel: +33 (0) 1-6930-3696 Italiano Tel: +39 (0) 2-249111-1 0.97REF 2. A critical component is 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. Fairchild Semiconductor Hong Kong 8/F, Room 808, Empire Centre 68 Mody Road, Tsimshatsui East Kowloon. Hong Kong Tel; +852-2722-8338 Fax: +852-2722-8383 Fairchild Semiconductor Japan Ltd. 4F, Natsume Bldg. 2-18-6, Yushima, Bunkyo-ku Tokyo, 113-0034 Japan Tel: 81-3-3818-8840 Fax: 81-3-3818-8841 Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. 6 FM50 Rev. C www.fairchildsemi.com |
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