Thermopile Infrared Sensor TP337 Features The thermopile sensor consists of a series of 116 thermoelements, forming a sensitive region size of 545m (diameter). The sensor is hermetically sealed into a TO-5 metal housing, with an optical filter. This standard filter allows measurements to be made in the spectral range above 5 m wavelength. The thermosensor exhibits an almost white noise, comparable to an ohmic resistance. It has a constant signal versus frequency up to its frequency limit, and is directly proportional to incident radiation. The thermopile sensors are featured with an additional temperature reference resistor on the same chip. The standard version of temperature reference resistor is housing connected to ground. Applications * Ear thermometers; clinic thermometers * Infrared thermometers * Consumer applications: hair dryer, micro-wave oven, air conditioner, refrigerator * Continuous temperature control of manufacturing * Security system * Radiation monitor switch system * Absorbing measurement for gas analysis * Thermoelectric converter * Heat flux flowmeter TP337 Thermopile Infrared Sensor Electrical Characteristics Parameter Condition Min. Typ. Max. Unit Number of thermojunctions --- 116 --- Chip size --- 1740*1740 --- m2 --- Diameter 545 --- m Thermopile Active region size Interference layer Thickness of substrate Siliconsubstrate 600 625 650 m Resistance of thermopile 25 50 60 70 K Sensitivity With 5-14m filter 70 85 100 V/W 1.0*108 1.3*108 1.7*108 cm*Hz1/2/W Time constant --- 16 --- ms Noise voltage 28 31 33 nV/Hz1/2 0.28 0.36 0.48 nW/Hz1/2 -20 --- 100 Detecctivity NEP Temperature range Operation --- Temperature reference resistor 25 29.1 30.0 30.9 K Temperature coefficient of resistance 25 3773 3811 3849 K Resistance Measured at 1 Hz chopper frequency, within spectral range 5-14m, using a blackbody radiator of 500K temperature. Note : Thermistor should be operated under 1mA. Thermopile Infrared Sensor Thermopile voltage vs. blackbody temperature Frequency response TP337 TP337 Thermopile Infrared Sensor Field of view 1) window size: 2.57mm (diameter) 337A 2) window size: 3.80mm (diameter) 337E Thermopile Infrared Sensor TP337 Thermistor vs. temperature The resistance of the temperature reference resistor varies with temperature and the behaviour is illustrated in the following figure. − At temperature 25, R(T)=R25e describes the resistance vs. temperature, where R25 is the resistance at ambient temperature 25 and T, T25 are the ambient temperatures in unit of kelvin degrees. TP337 Thermopile Infrared Sensor Pin assignment & description 2 thermistor pin 4 thermistor pin (GND) 1 thermopile output pin (+) 3 thermopile output pin (-) Thermistor 2(R) Thermopile 3(V-) 1(V+) 4(GND) BACKSIDE VIEW SIDE VIEW Order information : TP337 : A : Standard filter (5-14m), window size=2.57mm (diameter). B : Silicon filter with flat band transmission, window size=2.57mm (diameter). E : Standard filter (5-14m), window size=3.80mm (diameter). F : Silicon filter with flat band transmission, window size=3.80mm (diameter). Thermopile Infrared Sensor TP337 Transmission of filter Transmission of optical filter is measured by FTIR from 2m Package The sensor is hermetically sealed into a TO-5 metal housing, with an optical filter. This standard filter allows measurements to be made in the spectral range above 5m wavelength. The dimensions of header and cap are shown below. TP337 Thermopile Infrared Sensor TP337A Unit: mm ȥ8.15 ȥ5.4 2.00 Cap ȥ2.57 4.6 Window Header 0.43 Window IR Filter filter TP337E Unit: mm ȥ8.17 2.00 4.6 Chip Cap Header ȥ3.80 WIindow Window IR IR Filter filter 0.43 TP337 Thermopile Infrared Sensor Application circuit Circuit 1 : +5V C1 R1 Thermopile 2 4 R2 + - C3 R5 3 Vout + OP R6 1 C6 C4 R4 C5 Reference Resistor R3 C2 Circuit 2 : Ambient Temperature Compensation Circuit Pre-Amplification Circuit +5V R10 + A2 Thermopile (+) - +5V Adder C1 C3 + A1 - Thermopile (-) 2 4 R11 1 + 3 - R1 R2 Vout R7 R13 + A3 - R8 C2 reference resistor R9 R12 C4