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| ATS20 LOW-VOLTAGE ULTRA-LOW-POWER TEMPERATURE SENSOR New Release Specification General Description The ATS20 is a precision CMOS temperature sensor that provides a cost-effective solution for spaceconstrained applications. The output voltage ramp of the ATS20 has a negative slope 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 and positive temperature extremes. As well, the ATS20 does not require external calibration. Calibration of each device is performed at the factory. PRODUCT SPECIFICATION Pin Configuration SC70 5 -lead NC 1 5 GND GND VOUT 2 ATS20 4 3 VDD Features * * * * * * * * * * actual part marking below Extremely Low Power Precision Calibrated to 2C at 25C Ultra Low Operating Current : 12A 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 Accuracy (C) Uses a Single Positive Supply Operating Voltage Range: +2.4V to +6V Non-linearity: 0.8C 3 2 1 0 -1 -2 -3 -40 -20 0 20 25 125 upper spec limit lower spec limit Accuracy vs Temperature Applications * * * * * * * * * Cellular Telephones Computers Battery Management FAX Machines/Printers/Copiers Portable Medical Instruments HVAC Power Supply Modules Disk Drives Appliances 40 60 80 100 120 Ordering Information Part Number ATS20F5 y - year, w - week Package 5-Pin SC-70 Temperature Range -40C to +125C Part Marking Ayw How Supplied 3000 units on T&R (c) Andigilog, Inc. 2003 www.andigilog.com 70A03201-004 ATS20 Absolute Maximum Ratings1 Parameter Supply Voltage Output Voltage Continuous Current, any terminal Storage Temperature Range ESD3 Human Body Model Machine Model Thermal Resistance - JA Lead Temp Vapor Phase (60 sec) Infrared (15 sec) Rating +7V VDD + 0.5V 10mA -60C to +150C 2000V 250V 331C /W 260C 220C 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 VDD VOUT TA Parameter Supply Voltage Output Voltage Operating Temperature Range Min +2.4 0 -40 Max +6 VDD +125 Units V V C Electrical Characteristics3 Limits apply for -55C T A +130C and V D D = + 3 .0V unless otherwise noted. Parameter Accuracy4 Symbol Conditions TA=+25C TA=-40C (TMIN) TA=+125C (TMAX) Min -2 -3 -3 Typ 1 2 2 1 9 20 1 -11.77 Max +2 +3 +3 12 Units C C C C A A A mV/C mV C Non-linearity 5 Supply Current - Output floating Output Sink Capability6,7 Output Source Capability Average Output Slope (Sensor Gain) Output Voltage Self Heating8 6,7 IDD IOL IOH AOUT VOUT -40C TA +125C VDD = +3V VDD = +3V TA=0C SC-70-5 +1863.9 0.01043 Notes: 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 1863.9mV 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 rated 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 require a delay time before initial read at power up to allow charging of the capacitor. 8. Max Self Heating = JA x (VDD x IDD). Assumes a capacitive load. (c) Andigilog, Inc. 2003 -2www.andigilog.com 70A03201-004 ATS20 VOUT (mV) Temp (C) 125 VOUT (mV) 392.7 686.9 1569.7 1863.9 2333.7 2000 100 25 0 -40 1500 1000 500 100 -40 -20 0 25 50 75 100 125 Temperature (C) Temp (C) = (VOUT -1863.9mV) / -11.77mV/C Figure 1. ATS20 Output Voltage vs. Temperature 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 surface temperature. If the air temperature is much higher or lower than the surface temperature, the actual temperature 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 sealedend 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 condensation can occur. Printedcircuit 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. (c) Andigilog, Inc. 2003 -3www.andigilog.com 70A03201-004 ATS20 Performance Characteristics 3 Accuracy (C) 2 1 0 -1 -2 -3 -40 -20 0 20 25 125 upper spec limit lower spec limit 40 60 80 100 120 Figure 2. ATS20 Accuracy Range vs Temperature 12 11 10 9 VDD =+3V IDD (A) IDD ( mA) 8 7 6 5 4 3 2 1 0 -50 -25 0 25 50 75 100 125 Temperature (C) Figure 3. aTS Current vs Temperature (c) Andigilog, Inc. 2003 -4www.andigilog.com 70A03201-004 ATS20 Typical Applications 3V 3.9K ATS20 VTemp IN Serial REF Analog-to-Digital Converter 1.75V + FB Adjustable Shunt Voltage Reference SERIAL DATA OUT 100K CLOCK 1F 10K ENABLE Note: 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 ATS20 would still be capable of its full output swing. Figure 4. Serial Output Temperature to Digital Converter 3V 30K ATS20 VTemp IN 8 PARALLEL DATA OUTPUT _ 1.75V VREF Parallel Output Analog-to-Digital Converter INTR 5K 1F + CS 15K RD WR Figure 5. Parallel Output Temperature to Digital Converter (Full Scale = +125C) (c) Andigilog, Inc. 2003 -5www.andigilog.com 70A03201-004 ATS20 Typical Applications (cont'd) V+ RHYST RV+ VREF Shunt Voltage Reference RVD1 VTRIP + 0.1F RVD2 - VCONTROL V+ ATS20 VOUT VHYST2 VHYST1 VOUT VCONTROL VHYST2 = (VREF ) * (RVD2 ) RVD1 + (RVD2) * (RHYST ) RHYST + RVD2 VHYST1 = (VREF) * (RVD2 ) RVD2 + (RVD1 ) * (RHYST ) RHYST + RVD1 Note: VREF is set by the Shunt Voltage Reference. For VCONTROL high is an alarm state or control for activating cooling/fan. Figure 6. Thermostat/Fan Controller GND CFILTER 0.1F Bypass Cap ATS20 RFILTER Microcontroller Analog to Digital Converter VOUT VDD Figure 7. Digital Temperature output through a microcontroller (c) Andigilog, Inc. 2003 -6www.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 particularly noisy it may be necessary to add a low-pass filter 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 CFILTER < 1500pF are recommended. GND 0.1F Bypass Cap CFILTER RFILTER ATS20 VDD VOUT CL GND 0.1F Bypass Cap VDD CFILTER ATS20 VOUT RFILTER CL Resistor / Capacitor Combinations for Figure 8 Filter Network RFILTER CFILTER 1 F 200 0.1 F 470 0.01 F 680 1000 pF 1000 100pF 10k 10pF 100k Figure 8. ATS20 with Filter Network for Noisy Environments or for Capacitive Loads Greater than 300pF (c) Andigilog, Inc. 2003 -7www.andigilog.com 70A03201-004 ATS20 SC-70-5 Package Dimensions 0.50mm (min) 0.65mm BSC 0.65mm 2.00mm (min) 2.20mm (max) 1.15mm (min) 1.35mm (max) 0.65mm 1.80mm (min) 2.20mm (max) 0.80mm (min) 1.10mm (max) 0.40mm (min) 1.9mm 0.10mm (min) 0.25mm (max) 0.00mm (min) 0.10mm (max) 0.10mm (min) 0.30mm (max) 0.30mm (min) 0.40mm (max) Tape and Reel Data W A0 BB0 K0 P0 P1 P2 T F Andigilog, Inc. 8380 S. Kyrene Rd., Suite 101 Tempe, Arizona 85284-2120 Tel: (480) 940-6200 Fax: (480) 940-4255 (c) Andigilog, Inc. 2003 8.1 0.20 mm 2.25 0.10 mm 2.70 0.10 mm 1.20 0.10 mm 4.00 0.10 mm 4.00 0.10 mm 2.00 0.05 mm 0.30 0.05 mm 3.50 0.05 mm -8www.andigilog.com 70A03201-004 ATS20 Data Sheet Classifications Preliminary Specification This classification is shown on the heading of each page of a specification for products 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 products 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 the 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 prior 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 (c) Andigilog, Inc. 2003 -9www.andigilog.com 70A03201-004 ATS20 Notes: Andigilog, Inc. 8380 S. Kyrene Rd., Suite 101 Tempe, Arizona 85284-2120 Tel: (480) 940-6200 Fax: (480) 940-4255 (c) Andigilog, Inc. 2003 - 10 www.andigilog.com 70A03201-004 |
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