1 Features and Benefits

Transcription

1 Thermopile rray With Lens Optics Type HTP 16x4R1 1 Features and Benefits Small size single die, low cost 16x4 pixels IR array Easy to integrate Industry standard four lead TO-39 package Factory calibrated. Pixel to pixel relative error below 1.5% NETD (Noise Equivalent Temperature Difference) 0.@4Hz refresh rate I C compatible digital interface Programmable refresh rate 0.5Hz 51Hz (averaging recommend frame rate 3Hz).6V typical supply voltage Current consumption less than 9m Sleep mode consumption less than 5µ Measurement start trigger for synchronization with external control unit Different package options for applications and measurements versatility Ta -40 to 85 C To -50 to 1100 C possible; depending on accuracy requirement Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 1 of 43

2 Thermopile rray With Lens Optics Type HTP 16x4R1 General Description The HTP 16x4 is a (16x4 pixels) fully calibrated IR array in industry standard four lead TO-39 package. It contains chips in one package: the HTP 16x4 (IR array plus electronics) and the 40 (56x8 EEPROM) The HTP 16x4 contains 64 IR pixels with dedicated low noise chopper stabilized amplifier and fast DC integrated. PTT (Proportional To bsolute Temperature) sensor is integrated to measure the ambient temperature of the chip. The outputs of both IR and PTT sensors are stored in internal RM and are accessible through I C. The results of the infrared sensor measurements are stored in RM: 16-bit result of IR measurement for each individual sensor (64 words) 16-bit result of PTT sensor Depending on the application, an external microcontroller can read the different RM data and, based on the calibration constants, compensate the different sensitivities of each pixel to build up a thermal image, or calculate the object temperature at each pixel at the imaged scene. These constants are accessible by the microcontroller through the I C bus and have to be used for external post processing of the thermal data. This post processing includes: Ta calculation Pixel offset cancelling Pixel to pixel sensitivity difference compensation Object emissivity compensation Object temperature calculation Image processing and correction if necessary The result is an image with NETD better than 0.5 at 1Hz refresh rate. The refresh rate of the array is programmable by means of EEPROM settings or directly via I C command. Changes of the refresh rate have a direct impact on the integration time and noise bandwidth (faster refresh rate means higher noise level). The refresh rate is programmable in the range 0,5Hz 51Hz and can be changed to achieve the desired tradeoff between speed and accuracy. The HTP 16x4 requires a single 3V supply (±0,4V). The customer can choose between 3 operating modes: Normal. In this mode the device is free running under control of the internal state machine. Depending on the selected refresh rate Fps (Frame per second) the chip is constantly measuring both IR and PTT and is refreshing the data in the RM with specified refresh rate; Step. This mode is foreseen for synchronization with an external micro-controller. The internal state machine is halted. If the command StartMeas is received via the I C bus, a single measurement of all IR and PTT sensors will be done, then the chip will return in wait state. When in wait state the data in RM can be read. Power saving mode. In this mode all internal electronics will be completely shutdown and the chip will monitor the I C. ny transmission through I C initiated by Start condition will be detected. The internal oscillator will be powered on and the device will receive the slave address (S). If the S address of HTP 16x4 is recognized (S=0x60) the device will respond, receive and execute the command. Otherwise the chip will remain in power saving mode. The power saving mode can reduce current consumption down to 5μ and is excellent for battery applications. The HTP 16x4 is factory calibrated in wide temperature ranges: C for the ambient temperature sensor Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page of 43

3 Thermopile rray With Lens Optics Type HTP 16x4R C for the object temperature (up to 1100 C possible, depending on accuracy requirement). ll figures are depending on the accuracy requirement. Each pixel of the array will measure the average temperature of all objects in its own Field Of View (called FOV). It is very important for the application designer to understand that the accuracy of the temperature measurement is very sensitive to the thermal equilibrium isothermal conditions (there are no temperature differences across the sensor package). The accuracy of the thermometer can be influenced by temperature differences in the package induced by causes like (among others): Hot electronics behind the sensor, heaters/coolers behind or beside the sensor or by a hot/cold object very close to the sensor that not only heats the sensing element in the thermometer but also the thermometer package. This effect is especially relevant for thermometers with a small FOV as the energy received by the sensor from the object is reduced. Therefore, Heimann Sensor has integrated the possibility to measure the internal thermal gradients and to compensate the temperature calculation for them. However, this cannot completely compensate the effect of thermal gradients. It is therefore important to avoid the causes of thermal gradients as much as possible or to shield the sensor from them. Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 3 of 43

4 Thermopile rray With Lens Optics Type HTP 16x4R1 Directory 1 Features and Benefits... 1 General Description... 3 Ordering Information Pin Configuration Dimensional Drawings Maximum Ratings Operating Conditions Block diagram Block description rray layout Memories RM (Result Memory) Configuraton register Trimming register EEPROM POR Communication protocol Start / Stop condition Device addressing cknowledge EEPROM Communication Sensor Communication Measurement trigger Read measurement data... 3 IR data read... 3 PTTdata read... 4 Compensation pixel read Device modes Normal mode Step mode Power saving mode Integrated Sensor for gradient compensation Temperature calculation flow Initialization Calculation Considerations Calculation of absolute temperature of the die (Ta) Example for Ta calculations Calculation of To Calculating VIR(I,_COMPENSTED Example for To calculations...35 Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 4 of 43

5 Thermopile rray With Lens Optics Type HTP 16x4R1 16 Performance Graphs Temperature accuracy Noise performance and resolution Calculated Field Of View (FOV) pplications Information Use of the HTP 16x4 in I C configuration pplication Comments Initialization Liability Glossar...43 Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 5 of 43

6 Thermopile rray With Lens Optics Type HTP 16x4R1 HTP a x b Rx L xx E 3 Ordering Information Heimann thermopile array number of elements Revision of the sensor L lens cap TO39 followed by focal length of lens optional ending E for external aperture (L3.6 and L5.5 are only available with the external aperture) Example: HTP16x4R1L3.6E Currently available are: - HTP16x4R1L.1 - HTP16x4R1L.85 - HTP16x4R1L3.6E (standard) - HTP16x4R1L5.5E (standard) - HTP16x4R1L7.0 4 Pin Configuration Figure 1: pin-allocation Pin Symbol Description 1 SCL Digital input, serial clock in SMBus compatible mode SD Digital I/O, data input /output in SMBus compatible mode (open drain) 3 VDD Positive supply voltage 4 VSS Negative supply voltage / Ground (0V) (connected to housing) Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 6 of 43

7 Thermopile rray With Lens Optics Type HTP 16x4R1 5 Dimensional Drawings Figure : dimensional drawing of the HTP16x4R1L3.6E Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 7 of 43

8 Thermopile rray With Lens Optics Type HTP 16x4R1 Figure 3: dimensional drawing of the HTP16x4R1L5.5E Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 8 of 43

9 Thermopile rray With Lens Optics Type HTP 16x4R1 Figure 4: dimensional drawing of the HTP16x4R1L7.0 Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 9 of 43

10 Thermopile rray With Lens Optics Type HTP 16x4R1 Figure 5: dimensional drawing of the HTP16x4R1L.85 Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 10 of 43

11 Thermopile rray With Lens Optics Type HTP 16x4R1 Figure 6: dimensional drawing of the HTP16x4R1L.1 Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 11 of 43

12 Thermopile rray With Lens Optics Type HTP 16x4R1 Tab 1: maximum ratings and values 6 Maximum Ratings Parameter Supply Voltage, VDD (over voltage) 5V Supply Voltage, VDD (operating max) 3.6V Reverse Voltage (each pin) -0.3 V Operating Temperature Range, T C Storage Temperature Range, TS C ESD Sensitivity (EC Q100 00) kv (4kV) DC sink current, SD 5 m DC source current, SD N DC clamp current, SD N DC source current, SCL N (input only) DC clamp current, SCL N Pitch 0 µm bsorber size Ø 170 µm Pixel time constant 0.8 ms HTP 16x4 Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. 7 Operating Conditions ll parameters are valid for T = 5 C, V DD =.6V (unless otherwise specified) Tab : operating conditions Parameter Symbol Test Conditions Min Typ Max Units Supplies External supply 1 V DD V Supply current I DD No load m Power On Reset POR level V POR_up Power-up (full temp range)..4 V POR level V POR_down Power down (full temp V POR hysteresis V POR_hys range) Full temp range 0.1 V V DD rise time (10% to 90% of specified supply T POR Ensure POR signal 100 µs voltage) I C compatible -wire interface Slave address S Factory default 60 hex Input high voltage V IH (Ta, V) Over temperature and supply 0.7V V Input low voltage V IL (Ta, V) Over temperature and supply 0.3VD V Output low voltage V OL SD over temperature and D supply, Isink = 6m (FM 0.6 V Output low voltage V OL SD over temperature mode) and supply, Isink = 0m (FM+ 0.4 V SCL leakage I SCL, leak mode) V SCL =4V, Ta=+85 C µ Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 1 of 43

13 Thermopile rray With Lens Optics Type HTP 16x4R1 SD leakage I SD, leak V SD =4V, Ta=+85 C µ SCL capacitance C SCL 0 pf Clock frequency SCL IR 1 MHz cknowledge setup time Tsuac(MD) 8-th SCL falling edge, Master 0.45 µs cknowledge hold time Thdac(MD) 9-th SCL falling edge, Master 0.45 µs cknowledge setup time Tsuac(SD) 8-th SCL falling edge, Slave 0.45 µs cknowledge hold time Thdac(SD) 9-th SCL falling edge, Slave 0.45 µs EEPROM Slave address S Factory default 50 hex Clock frequency SCL EEPROM 400 khz Data retention Ta = +85 C 00 years Erase/write cycles Ta = +5 C 1M Times Erase/write cycles Ta = +15 C 100 Times Erase cell time T_erase 5 ms Write cell time T_write 5 ms 1) The device can be supplied with V but the best performance is achieved at VDD=.6V. For supply voltages above.7v a compensation algorithm should be applied for accurate temperature readings. Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 13 of 43

14 Thermopile rray With Lens Optics Type HTP 16x4R1 8 Block diagram HTP 16x4 Digital ctive Thermopile rray Pix 0, 0 IR Pix 0,1 IR Pix 0, 15 IR Pix 1,0 IR Pix 1, 1 IR Pix 1,15 IR Digital Conversion & Filtering Pix 3,0 IR Pix 3, 1 IR Pix 3,15 IR EEPROM I C RM Digital Filtering CL SD VDD VSS Figure 7: block diagram The device consists of chips packed in single TO-39 package IR array and processing electronics EEPROM chip Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 14 of 43

15 Col 0 Col 1 Col Col 3 Col 4 Col 5 Col 6 Col 7 Col 8 Col 9 Col 10 Col 11 Col 1 Col 13 Col 14 Col 15 Col0 Col1 Col Col3 Col4 Col5 Col6 Col7 Col8 Col9 Col10 Col11 Col1 Col13 Col14 Col15 Thermopile rray With Lens Optics Type HTP 16x4R1 9.1 rray layout 9 Block description Row 0 Row 1 Row Row 3 IR sensor Figure 8: array layout of IR sensors The array consists of 64 IR sensors (called also pixels).each pixel is identified with its row and column position as Pix(i, where i is its row number and j is its column number (from 0 to 15). Reference pin Row 0 Row 1 Row Row 3 Figure 9: assignment from inside alignment to external reference pin 10.1 RM (Result Memory) 10 Memories Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 15 of 43

16 Thermopile rray With Lens Optics Type HTP 16x4R1 The on chip 146x16 RM is accessible for reading via I C. The RM is used for storing the results of measurements of pixels and Ta sensor and is distributes as follows: 64 words for IR sensors. The data will be in s complement format 1 word for measurement result of PTT sensor. This sensor is selected to be a reference Ta for the device. The temperatures of all other Ta sensors are measured relative to this one. The data is 16 bit without sign. Physically this sensor is placed close to IR(1,1). Tab. 3: RM map ddress 0x00 0x01 0x0 0x03 0x04 0x05 0x06 0x07 0x3C 0x3D 0x3E 0x3F 0x40 0x41 0x9 0x93 RM variable description IR sensor (0,0) result IR sensor (1,0) result IR sensor (,0) result IR sensor (3,0) result IR sensor (0,1) result IR sensor (1,1) result IR sensor (,1) result IR sensor (3,1) result IR sensor (0,15) result IR sensor (1,15) result IR sensor (,15) result IR sensor (3,15) result PTT sensor result Compensation sensor result Configuration register Trimming register Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 16 of 43

17 Thermopile rray With Lens Optics Type HTP 16x4R Configuraton register The configuration register defines the chip operating modes. It can be read and written by the I C MD. Tab. 4: configuration register map configuration register bit meaning (0x9) IR Refresh rate = 51Hz x IR Refresh rate = 51Hz IR Refresh rate = 51Hz IR Refresh rate = 51Hz IR Refresh rate = 51Hz IR Refresh rate = 51Hz IR Refresh rate = 56Hz IR Refresh rate = 18Hz IR Refresh rate = 64Hz IR Refresh rate = 3Hz IR Refresh rate = 16Hz IR Refresh rate = 8Hz IR Refresh rate = 4Hz IR Refresh rate = Hz IR Refresh rate = 1Hz (default) IR Refresh rate = 0.5Hz bit resolution* bit resolution* bit resolution* bit resolution* 0 - continuous measurement mode - (default) 1 - step measurement mode 0 - Normal operation mode- (default) 1 - sleep mode N 0 - No IR measurement running (Flag only, cannot be written) 1 - IR measurement running (Flag only, cannot be written) - (default) 0 - POR or Brown out occured - Need to reload configuration register 1 - MD must write "1" during uploading configuration register - (default) 0 - IC FM + mode enabled (max bit transfer rates up to 1000kbits/s) - (default) 1 - IC FM + mode disabled (max bit transfer rates up to 400kbits/s) 0 0 EEPROM enabled 0 1 EEPROM disabled 0 Heimann Sensor reserved 1 Heimann Sensor reserved 0 Heimann Sensor reserved * Depending on bits [5:4], the RM readout represents x, x4, x8 increased resolution while maintaining the 16 bits data. This has the effect that for higher resolution readouts, the maximum measureable temperature is reduced (see 16.). Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 17 of 43

18 Thermopile rray With Lens Optics Type HTP 16x4R1 Tab. 5: trimming register Trimming register Trimming register bit meaning (0x93) x x x x x x x x x N 7 bit value - Oscillator trim value Opcode 0x04. This command is used to set the trimming parameters oscillator, bandgap, current source trimming bits values. It can be read and written by the I C MD. Simple data check is introduced. The two data bytes are sent two times: first time with the true data minus 0x and second time the true data. The chip does the addition with 0x internally and checks the second received byte. Only if the addition results match with the received data for the two bytes, the configuration register is updated. The command communication is illustrated below: S T R T Slave address 0 C Write trimming opcode Trimming data check LSByte C C Trimming data LSByte Trimming data check MSByte C C Trimming data MSByte C S T O P Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 18 of 43

19 Thermopile rray With Lens Optics Type HTP 16x4R1 10. EEPROM kbit, organized as 56x8 EEPROM is built in the HTP 16x4. The EEPROM is on a separate die (separate S = 0x50) and is used to store the calibration constants and the configuration of the device. Tab. 6: EEPROM map ddress ai(0,0) ai(1,0) ai(,0) ai(3,0) ai(0,1) ai(1,1) ai(,1) ai(3,1) ai - IR pixels individual offset coefficients ai(0,14) ai(1,14) ai(,14) ai(3,14) ai(1,15) ai(1,15) ai(,15) ai(3,15) 40 bi(0,0) bi(1,0) bi(,0) bi(3,0) bi(0,1) bi(1,1) bi(,1) bi(3,1) bi - Individual Ta dependence (slope) of IR pixels offset bi(0,14) bi(1,14) bi(,14) bi(3,14) bi(1,15) bi(1,15) bi(,15) bi(3,15) 80 (0,0) (1,0) (,0) (3,0) (0,1) (1,1) (,1) (3,1) Individual sensitivity coefficients 0 8 B0 B8 (0,14) (1,14) (,14) (3,14) (0,15) (1,15) (,15) (3,15) C0 Heimann Sensor C8 reserved D0 common T scale compensation pixel coefficients Scale D8 TGC offset PTT E0 common sensitivity coefficients Emissivity sta E8 Heimann Sensor reserved F0 Config register OSC trim F8 Chip ID Detailed descriptions of some EEPROM addresses are depicted here after: Tab. 7: D7 D0 EEPROM cell meaning Compensation pixel constants Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 19 of 43

20 Thermopile rray With Lens Optics Type HTP 16x4R1 D7 D6 D5 D4 D3 D D1 D0 EEPROM cell meaning b CP T scale commonh commonl [7:4] T1 scale [3:0] T scale - 10 a CPH a CPL - Compensation pixel individual offset - common offset - Individual Ta dependence (slope) of the compensation pixel offset cp_h cp_l - Sensitivity coefficient of the compensation pixel Tab. 8: DF D8 EEPROM cell meaning PTT constants DF DE DD DC DB D D9 D8 EEPROM cell meaning TGC - Thermal Gradient Coefficient Offset scale [7:4] - iscale [3:0] - Biscale Vth_H Vth_L - Vth0 of absolute temperature sensor T1_H T1_L - T1 of absolute temperature sensor T_H T_L - T of absolute temperature sensor Tab. 9: E7 E0 EEPROM cell meaning E7 E6 E5 E4 E3 E E1 E0 EEPROM cell meaning Heimann Sensor reserved scale 0scale H L - Emissivity coefficient Tab. 10: F7 F0 EEPROM cell meaning 0 _H 0 _L - Common sensitivity coefficient - Common sensitivity coefficient - Individual sensitivity scaling coefficient F7 F6 F5 F4 F3 F F1 F0 EEPROM cell meaning OSC_trim Heimann Sensor reserved CFG H CFG L - Config register value - Oscillator trimming value Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 0 of 43

21 Thermopile rray With Lens Optics Type HTP 16x4R POR The Power On Reset (POR) is connected to the Vdd supply. The on-chip POR circuit provides an active level of the POR signal when the Vdd voltage rises above approximately 0.5V and holds the entire HTP 16x4 in reset until the Vdd is higher than.4v. The device will start approximately 5 ms after the POR release. 11 Communication protocol The device supports Fast Mode Plus I C FM+ (up to 1Mbps) and will work in slave mode only. See full I C specification at: The communication is running through digital pins: SCL and SD. The master device is providing the clock signal SCL for the communication. The data line SD is driven by either the master or the slave depending on the direction of the communication. 0 is transmitted by pulling the SD line to LOW and a 1 by releasing it HIGH. During the data transfer the SD must remain stable while SCL is HIGH. Changes in SD are allowed only when SCL is LOW Start / Stop condition Each communication session is initiated by a STRT condition and ends with a STOP condition. STRT condition is initiated by a HIGH to LOW transition of the SD while a STOP is generated by a LOW to HIGH transition. Both changes must be done while the SCL is HIGH (see the figure) SCL SD STRT Figure 10: Start / Stop conditions of I C STOP Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 1 of 43

22 Thermopile rray With Lens Optics Type HTP 16x4R1 11. Device addressing The master is addressing the slave device by sending a 7-bit slave address + R/W bit after the STRT condition. This bit indicates the direction of the transfer: Read (HIGH) means that the master will read the data from the slave Write (LOW) means that the master will send data to the slave HTP 16x4 is responding to different slave addresses: R/W R/W for access to internal EEPROM for access to IR array chip 11.3 cknowledge During the 9 th clock following every byte transfer the transmitter releases the SD line. The receiver acknowledges (C) receiving the byte by pulling SD line to low or does not acknowledge (NoC) by letting the SD high EEPROM Communication For further information see datasheet of Sensor Communication Measurement trigger fter the initialization procedure is done depending on the selected measurement mode (bit 6 in the configuration register) there are two possible routines: - continuous mode - wait for valid data (depending on chosen refresh rates IR and PTT) - Step mode - Send start measurement command Slave address Command SD S W P SCL Figure 11: Start measurement command (S = 0x60, command = 0x0801) - Wait certain time Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page of 43

23 Thermopile rray With Lens Optics Type HTP 16x4R1 - Wait for the ready flag to be set IR data read Read measurement data There are four options available for reading IR data: - Whole frame read (Heimann Sensor recommends the whole frame read for maximum refresh rate) Slave address Command Start address ddress step Number of reads Slave address SD S W S R SCL IR pixel(0, 0) LSByte IR pixel(0, 0) MSByte IR pixel(1, 0) LSByte IR pixel(1, 0) MSByte IR pixel(3, 15) LSByte IR pixel(3, 15) MSByte P Figure 1 Whole frame (S = 0x60, command = 0x0, Start address = 0x00, ddress step = 0x01, Number of reads = 0x40) measurement result read - Single column read Slave address Command ddress step Number of reads Slave address SD S W Start address S R SCL IR pixel(0, column) LSByte IR pixel(0, column) MSByte IR pixel(1, column) LSByte IR pixel(1, column) MSByte IR pixel(3, column) LSByte IR pixel(3, column) MSByte P Figure 13 Single column (S = 0x60, command = 0x0, Start address = 0x00 0x3C (step 0x04), ddress step = 0x01, Number of reads = 0x04) measurement result read - Single line read Slave address Command ddress step Number of reads Slave address SD S W Start address S R SCL IR pixel(line, 0) LSByte IR pixel(line, 0) MSByte IR pixel(line, 1) LSByte IR pixel(line, 1) MSByte IR pixel(line, 15) LSByte IR pixel(line, 15) MSByte P Figure 14 Single line (S = 0x60, command = 0x0, Start address = 0x00 0x03 (step 0x01), ddress step = 0x04, Number of reads = 0x10) measurement result read Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 3 of 43

24 Thermopile rray With Lens Optics Type HTP 16x4R1 - Single pixel read Slave address Command ddress step Number of reads Slave address SD Start address S W S R P IR pixel data LSByte IR pixel data MSByte SCL Figure 15 Single pixel (S = 0x60, command = 0x0, Start address = 0x00 0x3F, ddress step = 0x00, Number of reads = 0x01) measurement result read PTTdata read bsolute ambient temperature data of the device itself (package temperature) can be read by using following command: Slave address Command Start address ddress step Number of reads Slave address SD PTT data PTT data LSByte MSByte S W S R P SCL Figure 16: PTT (S = 0x60, command = 0x0, Start address = 0x40, ddress step = 0x00, Number of reads = 0x01) measurement result read PTT _ data { PTT _ data _ MSbyte : PTT _ data _ LSbyte } Compensation pixel read Slave address Command Start address ddress step Number of reads Slave address SD PTT data PTT data LSByte MSByte S W S R P SCL Figure 17 Compensation pixel (S = 0x60, command = 0x0, Start address = 0x41, ddress step = 0x00, Number of reads = 0x01) measurement result read The 16bit data for each pixel is: IR( i, _ data { IR( i, _ data _ MSbyte : IR( i, _ data _ LSbyte } The device can operate in following modes: Normal mode Step mode Power saving mode 1.1 Normal mode 1 Device modes In this mode the measurements are constantly running. Depending on the selected refresh rate Fps in ConfReg, the data for IR pixels and Ta will be updated in the RM each 1/Fps seconds. In this mode the external microcontroller has full access to the internal registers and memories of the device (both for HTP 16x4 and EEPROM chip). Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 4 of 43

25 Thermopile rray With Lens Optics Type HTP 16x4R1 1. Step mode This mode is foreseen for single measurements triggered by the external device (microcontroller). Entering this mode is possible by writing the appropriate code in ConfReg. measurement is triggered by sending the command StartMeas. On detecting the command, the HTP 16x4 will start the measurements immediately after the I C session is finished (STOP condition detected). The measurement time is 1/Fps and can be selected in possible ways: The already programmed Fps parameter in ConfReg can be used and the measurement (integration) time will take 1/Fps The Fps parameter can be an argument in the StartMeas command. Once the Step mode is initiated the access to the internal registers of the device will be disabled. If the master sends a command to the HTP 16x4 while the measurement in step mode is ongoing, a Nockn will be received after the slave address is transmitted. S T R T Slave address 0 C N StartMeas C N S T 0 P S T R T Slave address 0 N O C N S T R T Slave address 0 N O C N S T R T Slave address 0 C N 1/Fps Wait for command Measurement Wait for command Figure 18: Execution of Start_Meas in Step mode 1.3 Power saving mode In this mode the device will be completely shutdown and the current consumption will be minimized to less than 5 µ. Entering this mode is initiated by sending the command Sleep. Upon receiving it the device will shutdown all electronics, including the internal oscillator. The chip will monitor the I C line. Each STRT condition will wake up the oscillator and the chip will receive and evaluate the slave address. If the address is 0x60 (address programmed in HTP 16x4) the device will evaluate the whole command and will execute it. If not, the oscillator will be switched off again. 13 Integrated Sensor for gradient compensation The IR sensor readings and accuracy are very sensitive to any temperature gradients over the package. ny temperature difference between the cold junction of thermopile and (part of) the package, seen by the IR sensor will create an error signal. Such a problem is not very severe for the applications where absolute measurement is not required, because in this case it is important to cancel the distortion. However for the applications where the picture must be converted to temperatures, seen by the different pixels, such a gradient will introduce huge error in the measurement. The problem will be even more severe if there is a variation of the gradient (unfortunately the most common case, because the gradient comes from power dissipation of electronics on the same pcb, which varies with environmental conditions). The HTP16x4 supports one extra IR channel containing amplifier, DC and digital filter. The input of this chain is connected to bond pads. n additional IR sensor can be placed Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 5 of 43

26 Thermopile rray With Lens Optics Type HTP 16x4R1 in the same package and connected to these bond pads. If this sensor is optically blinded (seeing only package, not outside) its output can be used to compensate the error readings of the main array. Heimann Sensor has developed and implemented this approach successfully. The experience shows that the readings of additional sensor allow reduction of the gradient s error by factor of 10. Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 6 of 43

27 Thermopile rray With Lens Optics Type HTP 16x4R1 14 Temperature calculation flow The following algorithm shows an example of a program execution flow to achieve object as well as ambient temperatures. POR Wait 5ms Read the EEPROM Store the calibration coefficients in the MCU RM for fast access Write the oscillator trim value (address 0x93) Make sure that the POR/Brown Out flag value is 1 (bit 10 in the configuration value) Write the configuration value (address 0x9) Either read from the EEPROM or hard coded Yes POR/Brown Out flag cleared? No Step mode Step Mode? No Start measurement Measurement end? Yes Continuous mode Note: In step mode the measurement end could be determined in 3 ways: 1.Introducing an appropriate delay;.by polling the flag; 3.Combination of 1. and. Read measurement data (desired IR data + PTT) Ta calculation Supply voltage compensation Pixel offset cancelling Pixel to pixel normalization Object emissivity compensation Object temperature calculation Image processing and correction Figure 19: temperature calculation flow Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 7 of 43

28 Thermopile rray With Lens Optics Type HTP 16x4R Initialization fter the POR is released the external CPU must execute an initialization procedure. This procedure must start at least 5ms after POR release. - Read the whole EEPROM (see Figure 0). For maximum speed performance Heimann Sensor recommends that the whole calibration data is stored into the client MCU RM. However it is possible to read the calibration data from the EEPROM only when needed. This will result in increased time for temperature calculation i.e. low refresh rate. Slave address Command Slave address SD Initial address - 0x00 DT(0x00) S W S R DT(0x01) DT(0xFF) C N P SCL Figure 0 Whole EEPROM dump (S = 0x50) - Store the EEPROM content into customer MCU RM (see above paragraph for optional information) - Write the oscillator trimming value (extracted from EEPROM content at address 0xF7) into the corresponding register (0x93). Slave address Command SD LSByte check (LSByte - 0x) LSByte data S W MSByte check (MSByte - 0x) MSByte data P SCL Figure 1 Write oscillator trimming (S = 0x60, command = 0x04) - Write device configuration value. In EEPROM addresses (0xF5 and 0xF6) Heimann Sensor provides a typical value of the configuration register (0x740E). So it is up to the user to copy that value or hardcode a new value to be loaded into the configuration register. If the EEPROM value is to be used the 16 bits are combined as follows: For instance if EEPROM 0xF5 = 0x0E and 0xF6 = 0x74, the Configuration register value is: Configurat ion _ register _ value {0xF6: 0xF5} 0x740E Slave address Command SD LSByte check (LSByte - 0x55) LSByte data S W MSByte check (MSByte - 0x55) MSByte data (15:11) 1 (9:8) P SCL Figure Write configuration register (S = 0x60, command = 0x03) NOTE: The customer must ensure that the bit 10 (POR or Brown-out flag) in Configuration register is set to 1 by the MD. Furthermore this bit must be checked regularly and if it is cleared that means that the device has been reset and the initialization procedure must be redone. Opcode 0x03. Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 8 of 43

29 Thermopile rray With Lens Optics Type HTP 16x4R1 This command is used to set the configuration register (16bits) value all configuration settings. Simple data check is introduced. The two data bytes are sent two times: first time with the true data minus 0x55 and second time the true data. The chip does the addition with 0x55 internally and checks the second received byte. Only if the addition results match with the received data for the two bytes, the configuration register is updated. The command communication is illustrated below: S T R T Slave address 0 C Write configuration register opcode C Confuguration data check LSByte C Confuguration data LSByte C Confuguration data check MSByte C Confuguration data MSByte C S T O P Figure 3: Write configuration register command The default configuration is: - IR refresh rate = 1Hz - Ta refresh rate = 0.5Hz - Continuous measurement mode - Normal mode (no sleep) - I C FM+ mode (max bit transfer rates up to 1000 kbit/s) enabled - DC low reference enabled 15 Calculation Considerations 15.1 Calculation of absolute temperature of the die (Ta) The output signal of the IR sensor is relative to its cold junction temperature. That is why we need to know the absolute temperature of the die in order to be able to calculate the object temperature seen by each pixel. The Ta can be calculated using the formula: Ta T1 T1 4 T V TH T 5 PTT _ data 5,[ C] Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 9 of 43

30 Thermopile rray With Lens Optics Type HTP 16x4R1 Constants V TH (5), T1and T are stored in EEPROM at following addresses as two s complement values: Tab. 11: absolute temperature values storage adress EEPROM address Cell name Stored as Parameter 0xD 0xDB 0xDC 0xDD 0xDE 0xDF V TH _L V TH _H T1 _L T1 _H T _L T _H s complement V TH0 of absolute temperature sensor s complement T1 of absolute temperature sensor s complement T of absolute temperature sensor 0xD T_scale unsigned [7:4] T1_scale [3:0] T_scale V TH 5 56VTH _ H VTH _ L If V TH VTH 5 VTH VTH 5 V TH 5 3ConfigReg[5:4] T1 56 T1_ H T1_ L If T T1 T T1 T1 T 3 Re [5:4] 1_ scale Config g T 56 T _ H T _ L If T 3767 T T T T T _ scale 10 3ConfigReg[5:4] 15. Example for Ta calculations Let s assume that the values in EEPROM are as follows: Tab. 1: examples of cell values written in the EEPROM EEPROM address Cell name Cell values (hex) 0xD V TH _L 0x78 0xDB V TH _H 0x1 0xDC T1 _L 0x33 0xDD T1 _H 0x5B 0xDE T _L 0xCC 0xDF T _H 0xED V TH 56V V TH _ H TH _ L, decimal value Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 30 of 43

31 Thermopile rray With Lens Optics Type HTP 16x4R1 Sign check V TH ConfigReg[5:4]=3 V TH T1_ scale 10 T1 56 T1_ H T1_ L 3347 Sign check 3347 < 3767 T T1 T1 T 1_ scale 3 ConfigRe g [5:4] T _ scale 10 T 56 T _ H T _ L Sign check T T 4660 T T _ scale 10 3ConfigReg[5:4] Let s assume that the input data is: PTT _ data 0x1C0 = 6848 dec Thus the ambient temperature is: Ta T1 T1 4 T V TH T (5) PTT _ data.7998 Ta.7998 Ta ( ) Ta Ta 8. 16C 15.3 Calculation of To Following formula is used to calculate the temperature seen by specific pixel in the matrix: Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 31 of 43

32 Thermopile rray With Lens Optics Type HTP 16x4R1 T where: V 4 T ,[ ] 4 O( i, VIR ( i, _ COMPENSTED a C IR i, _ COMPENSTED ( is the parasitic free IR compensated signal T a is ambient temperature calculated in Calculating VIR(I,_COMPENSTED 1. Offset compensation V V Where: IR( i, _ OFF _ COMP IR ( i, i( i, i( i, a a _ 0 B T T V is a individual pixel IR_data readout (RM read) IR ( i, is a individual pixel offset restored from the EEPROM using the i( i, following formula: common ai i ( i, 3 iscale ( i, ConfigReg[5:4] common is the minimum offset value stored in the EEPROM at addresses 0xD0 and 0xD1 as s complement value a is the difference between the individual offset and the minimum i( i, value. It is stored in the EEPROM as unsigned values. iscale is the scaling coefficient for the a i( i, values and is stored in the EEPROM at address 0xD9[7:4] as an unsigned value B is an individual pixel offset slope coefficient B i( i, i( i, BiScale b i( i, 3ConfigReg[5:4] bi is the value stored in EEPROM as two s complements ( i, B iscale is a scaling coefficient for the slopes of IR pixels offset and is stored in the EEPROM at address 0xD9[3:0] as an unsigned value T is the ambient temperature calculated in 15.1 a T a _ 0 5C is a constant NOTE: This applies to the compensation pixel as well ( a CP and b CP while iscaleis the same) B. Thermal Gradient Compensation (TGC) Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 3 of 43

33 Thermopile rray With Lens Optics Type HTP 16x4R1 V IR( i, _ TGC _ COMP VIR( i, _ OFF _ COMP TGC V IR _ CP_ OFF _ COMP Where: V IR _ CP_ OFF _ COMP is the offset compensated IR signal of the thermal gradient compensation pixel TGC TGC EEPROM EEPROM 3 TGC is a coefficient stored at EEPROM address 0xD8 as a two s complement value 3. Pixel to pixel normalization VIR ( i, _ TGC _ VIR ( i, _ NORMLIZED TGC Where: ( i, COMP CP 56 0_ H 0 _ L ( i, 0 _ SCLE SCLE ( i, 3ConfigReg[5:4] 56 CP_ H CP_ L CP 0 _ SCLE 3ConfigReg[5:4] 0 _ H, 0 _ L, CP_ H, CP_ L, ( i,, 0 _ SCLE and SCLE are stored in the EEPROM as unsigned values 4. Emissivity compensation V IR ( i, _ COMPENSTED V IR ( i, _ NORMLIZED Where: is the emissivity coefficient. The scaled value is stored into EEPROM as unsigned value 56 H L 3768 Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 33 of 43

34 Thermopile rray With Lens Optics Type HTP 16x4R1 Parameters necessary to calculate To are stored into EEPROM at following addresses: Tab 13: parameter used in calculation EEPROM address Cell name Stored as Parameter 0x00 0x3F a i( i, unsigned IR pixel individual offset delta coefficient 0x40 0x7F b i( i, s complement Individual Ta dependence (slope) of IR pixels offset 0x80 0xBF ( i, unsigned Individual sensitivity coefficient 0xD0 0xD1 0xD3 0xD4 0xD5 0xD6 0xD7 common_ L common_ H a CP _ L a CP _ H s complement IR pixel common offset coefficient s complement b CP s complement CP_ L CP_ H unsigned Compensation pixels individual offset coefficients Individual Ta dependence (slope) of the compensation pixel offset Sensitivity coefficient of the compensation pixel 0xD8 TGC s complement Thermal gradient coefficient 0xD9 iscale, BiScale unsigned Scaling coefficients for the IR pixels offset deltas and the slope of the IR pixels offset 0xE0 0xE1 0xE 0xE3 0xE4 0xE5 0 _ L 0 _ H unsigned Common sensitivity coefficient of IR pixels 0 _ SCLE unsigned Scaling coefficient for common sensitivity SCLE unsigned Scaling coefficient for individual sensitivity L H unsigned Emissivity Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 34 of 43

35 Thermopile rray With Lens Optics Type HTP 16x4R Example for To calculations Let s assume that we have following EEPROM data for pixel i=, j=8: Tab 14: example of values while calculating object temperature EEPROM address Cell name Stored as Cell values (hex) a unsigned 0xD 0x i(,8) 0x6 b i(,8) 0x (,8 ) s complement 0xC1 unsigned 0x8F 0xD0 0xD1 0xD3 0xD4 0xD5 0xD6 0xD7 0xD8 0xD9 0xE0 0xE1 0xE 0xE3 0xE4 0xE5 common_ L s 0x96 complement _ 0xFF common a CP _ L H s 0xC8 a complement _ 0xFF CP b CP H CP_ L s complement 0xC 0x80 unsigned 0x09 CP_ H s TGC 0x18 complement, unsigned 0x07 iscale BiScale unsigned 0xE4 0 _ L 0 _ H unsigned 0xD5 0 _ SCLE unsigned 0x SCLE unsigned 0x1 _ L unsigned 0x9 _ H unsigned 0x79 Let s assume that we have the following input data: V CP 0xFFD , decimal value V IR V Sign check 3767 (,8) 0x , decimal value Ta. 16C Sign check V (as calculated in 15.1) Reference routine for To computation: CP IR (,8) a CP 56 acp_ H acp_ L 65480, decimal value Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 35 of 43

36 Thermopile rray With Lens Optics Type HTP 16x4R a CP a CP 48 Sign check 3767 CP 3ConfigReg[5:4] b CP 0xC 0, decimal value V 0 b CP bcp BiScale 3 ConfigRe [5:4] 7 0 V B T T Sign check 17 B IR _ CP_ OFF _ COMP a i b i V Common CP g CP CP CP a a _0 56 Common _ H Common _ L Sign check (,8) 0xD 45, decimal value a Common iscale 0 common i(,8) i(,8) 3ConfigReg[5:4] (,8) 0xC1 193, decimal value Sign check b B B V i(,8) B T i(,8) i(,8) 3ConfigReg[5:4] iscale b T IR(,8)_ OFF _ COMP IR(,8) i(,8) i(,8) a a _0 TGC EEPROM 0x18 4, decimal value Sign check 4 17 TGC EEPROM 4 TGCEEPROM 4 TGC V IR( i, _ TGC _ COMP VIR( i, _ OFF _ COMP TGCVIR _ CP_ OFF _ COMP V _ H 0_ L (,8) 0 _ SCLE 4 33 SCLE 8 (,8) ConfigReg[5:4] 0 CP 56 0 _ SCLE CP_ H CP_ L 3ConfigReg[5:4] V IR (,8) _ TGC _ COMP IR (,8) _ NORMLIZED 8 10 (,8) TGC CP Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 36 of 43

37 Thermopile rray With Lens Optics Type HTP 16x4R1 56 _ H _ L V V IR (,8) _ NORMLIZED IR (,8) _ COMPENSTED T 4 T O(,8) VIR (,8) _ COMPENSTED a T O (,8) C Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 37 of 43

38 Thermopile rray With Lens Optics Type HTP 16x4R1 16 Performance Graphs 16.1 Temperature accuracy ll accuracy specifications apply under settled isothermal conditions only. Furthermore, the accuracy is only valid if the object fills the FOV of the sensor completely. Figure 4: bsolute temperature accuracy for the central four pixels NOTE: The accuracy is specified for the four central pixels. The accuracy of the rest of the pixels is according to the uniformity statement 16. Noise performance and resolution There are two bits in the configuration register that allow changing the resolution of the HTP16x4R1 measurements. Increasing the resolution decreases the quantization noise and improves the overall noise performance. Heimann Sensor GmbH Geschäftsführer: Ostsächsische Sparkasse Dresden Commerzbank G mtsgericht Dresden Dr. Jörg Schieferdecker SWIFT-Code: SOLDEST BIC: COBDEFF850 HRB 069 Mischa Schulze BIC: OSDDDE81XXX IBN: DE Steuer-Nr.: 0/110/07487 IBN: DE (EUR) Ust-Ident-Nr.: DE IBN: DE (USD) Page 38 of 43