 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| FM20 Low Voltage Ultra-Low-Power Temperature Sensor June 2001 FM20 Low Voltage Ultra-Low-Power Temperature Sensor General Description The FM20 is a precision CMOS temperature sensor that provides a cost-effective solution for space-constrained applications. The output voltage ramp of the FM20 has a negative slope of -11.77mV/C. With a supply voltage of 2.4V to 6V, the FM20 is typically accurate to 1C at 25C, to 3C over the range of -55C to 130C. Reducing the supply voltage to 2.4V does not change the negative temperature extreme from -55C, and the positive extreme also remains at +130C. The FM20 does not require external calibration. Calibration of the FM20 is performed at the factory. The FM20 is available in 5-pin SC70 and 3-pin SOT-23 surface mount packages. I Temperature Range: -55C to 130C I Linear Output Ramp (-11.77mV/C) I Output Ramp is Calibrated to Degrees Celsius I Low Self Heating (0.02C max in still air) I Uses a Single Positive Supply I Operating Voltage Range: +2.4V to +6V Applications I Cellular Telephones I Computers I Battery Management I FAX Machines/Printers/Copiers I Portable Medical Instruments I HVAC I Power Supply Modules I Disk Drives I Appliances Features I Extremely Low Power I Precision Calibrated to 1C (typical) at 25C Typical Applications 5V 3.9K VTemp IN Serial REF Analog-to-Digital Converter 1.75V + FB 1F 10K ENABLE Adjustable Shunt Voltage Reference CLOCK FM20 SERIAL DATA OUT 100K Serial Output Temperature to Digital Converter (The full scale of the A-to-D Converter will typically be limited to +125C simply by the number of bits available in the conversion. The FM20 would still be capable of its full output swing.) (c) 2001 Fairchild Semiconductor Corporation FM20 Rev. A.5 1 www.fairchildsemi.com FM20 Low Voltage Ultra-Low-Power Temperature Sensor Typical Applications (continued) 5V 30K VTemp FM20 IN 8 PARALLEL DATA OUTPUT _ VREF 5K 1F + 1.75V Parallel Output Analog-to-Digital Converter INTR CS 15K RD WR Parallel Output Temperature to Digital Converter (Full Scale = +125C) V+ RHYST RV+ VREF Shunt Voltage Reference RVD1 VTRIP VCONTROL RVD2 0.1F V+ FM20 VOUT VHYST2 = VHYST2 VHYST1 VOUT VCONTROL VHYST1 = (VREF) * (RVD2) (RVD2) * (RHYST) RVD1 + RHYST + RVD2 (VREF) * (RVD2) RVD2 + (RVD1) * (RHYST) RHYST + RVD1 VREF is set by the Shunt Voltage Reference. VCONTROL high is an alarm state or control for activating cooling/fan. Thermostat/ Fan Controller 2 FM20 Rev. A.5 www.fairchildsemi.com FM20 Low Voltage Ultra-Low-Power Temperature Sensor Typical Applications (continued) GND CFILTER 0.1F Bypass Cap FM20 VOUT RFILTER Microcontroller Analog to Digital Converter VDD Digital Temperature Output Through a Microcontroller Pin Configuration SC-70 (Top View) VOUT 3 GND 2 N/C 1 SOT-23 (Top View) GND 3 FM20 4 VDD 5 GND FM20 1 VDD 2 VOUT 3 FM20 Rev. A.5 www.fairchildsemi.com FM20 Low Voltage Ultra-Low-Power Temperature Sensor Ordering Information Part Number FM20P5x FM20S3x Package 5-Pin SC70 3-Pin SOT-23 Temperature Range -55C to +130C -55C to +130C How Supplied 3000 units on T&R 3000 units on T&R Absolute Maximum Ratings (Note 1) Parameter Supply Voltage Output Voltage Output Current Rating +7V VDD + 0.5V -20/+1A Storage Temperature Range Lead Soldering Temperature ESD2 Human Body Model Machine Model -60C to +150C 220C 2000V 250V 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. Recommended Operating Ratings Symbol VDD VOUT TA Parameter Supply Voltage Output Voltage Operating Temperature Range Min +2.4 0 -55 Max +6 VDD +130 Units V V C Electrical Characteristics4 Limits apply for -55C TA +130C and VDD = +5.0V unless otherwise noted. Parameter Accuracy4 Symbol Conditions TA = +25C TA = -55C (TMIN) TA = +130C (TMAX) Min -2 -3 -5 -5 Typ 1 2 2 Max +2 +3 +5 +2 Units C C C C A A A A mV/C mV Non-linearity5 Quiescent Supply Current Output Floating Output Sink Capability6 Output Source Capability6 Average Output Slope (Sensor Gain) Output Voltage Capacitive Load7 IDD IOL IOH AOUT VOUT CL SOT-23 SC70 TA = 0C TA = +25C -55C TA +130C VDD = +5V VDD = +5V 7.5 5 9 9 20 1 -11.77 +1863.9 10.5 12 0 1000 0.02016 0.02082 pF C C Self Heating Notes: 3. These specifications are guaranteed only for the test conditions listed. 4. Accuracy (expressed in C) = Difference between calculated output voltage and measured output voltage. Calculated output voltage = -11.77mV/C multiplied by device's case temperature at specified conditions of temperature, voltage and power supply plus an offset of 1863.9 mV 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 rated temperature range. 6. Lowest output current should be targeted; higher currents result in more self-heating of the device. 7. High capacitive loads may be driven by the output in a static mode, but it may require a delay time before initial read at power up to allow for the RC time constant of the charging capacitor. 4 FM20 Rev. A.5 www.fairchildsemi.com FM20 Low Voltage Ultra-Low-Power Temperature Sensor VOUT (mV) 1863.9 391 -50 -40 -25 0 25 50 75 100 125 Temperature (C) Temperature (C) = VOUT - 1863.9mV -11.77mV/C FM20 Output Voltage vs. Temperature Mounting The FM20 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 FM20 die will be at an intermediate temperature between the surface temperature and the air temperature. To ensure good thermal conductivity, the backside of the FM20 die is directly attached to the GND pin. The lands and traces to the FM20 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 FM20's temperature to deviate from the desired temperature. Alternatively, the FM20 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 FM20 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 FM20 or its connections. 5 FM20 Rev. A.5 www.fairchildsemi.com FM20 Low Voltage Ultra-Low-Power Temperature Sensor Typical Performance Characteristics Quiescent Current vs. Temperature 12 11 10 9 8 7 6 -50 -25 0 25 50 75 100 125 Quiescent Current (A) VDD = +5V Temperature (C) Accuracy vs. Temperature 3 2 VDD =+5V upper spec limit Accuracy (C) 1 0 -1 -2 -3 -4 -5 -50 0 lower spec limit 50 100 Temperature (C) 6 FM20 Rev. A.5 www.fairchildsemi.com FM20 Low Voltage Ultra-Low-Power Temperature Sensor Loading The FM20 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. GND 0.1F Bypass Cap VDD VOUT CL In environments that are particularly noisy it may be necessary to add a low-pass filter network to the output of the device. As shown below, 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 FM20, while filtering the higher frequency noise. The response time of the FM20 can be affected by this filter network, therefore values for CFILTER < 1500pF are recommended. CFILTER RFILTER GND 0.1F Bypass Cap VDD VOUT RFILTER CFILTER CL FM20 with Filter Network for Noisy Environments or for Capacitive Loads Greater than 300pF Resistor/Capacitor Combinations for Filter Network RFILTER 200 470 680 1000 10k 100k CFILTER 1F 0.1F 0.01F 1000pF 100pF 10pF 7 FM20 Rev. A.5 www.fairchildsemi.com FM20 Low Voltage Ultra-Low-Power 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 MA03A 0.97REF 8 FM20 Rev. A.5 www.fairchildsemi.com FM20 Low Voltage Ultra-Low-Power Temperature Sensor Physical Dimensions inches (millimeters) unless otherwise noted SC70 5-pin Package Dimensions FS Package Code MAA05A 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 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. 9 FM20 Rev. A.5 www.fairchildsemi.com |
Price & Availability of FM20
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |