MLX90817KXE-DBH-008-RE

MLX90817 Absolute Pressure Sensor IC ▪ ▪ ▪ ▪ ▪ ▪ ▪ Features and Benefits Application Examples High accuracy absolute pressure sensor Ratiometric Analog Output System in a package: MEMS, analog front end circuitry, 16 bit microcontroller, analog back end circuitry, voltage regulators Large automotive temperature range (-40°C to 150°C) Automotive qualified and automotive diagnostic features (clamping levels, broken track diagnostics, multiple internal fault diagnostics) Factory calibrated or fully programmable or reconfigurable through the connector for customized calibration curves Assembled in a rugged easy to use 4x5mm DFN package ▪ ▪ ▪ ▪ Automotive applications with absolute pressure from 1bar to 5.5bar Manifold and Turbo Manifold Air Pressure Manifold and Turbo Manifold Air Pressure combined with Temperature LPG/CNG Injectors Ordering Information Product Code Temperature Code Package Code Option Code Packing Form Code MLX90817 MLX90817 MLX90817 MLX90817 MLX90817 MLX90817 MLX90817 MLX90817 MLX90817 MLX90817 L L L K L L L L L L XE XE XE XE XE XE XE XE XE XE DBG-001 DBG-003 DBH-008 DBH-008 DBG-010 DBG-012 DBG-013 DBH-014 DCG-000 DCH-008 RE RE RE RE RE RE RE RE RE RE Legend: Temperature Code: Package Code: Option Code: Packing Form: Ordering example: REV 009 – 20 OCT 2020 3901090817 L (-40°C to 150°C) K (-40°C to 125°C) XE = DFN14 DBG-001 = 0.5 to 4bar absolute pressure / 0.5V to 4.5V output DBG-003 = 0.2 to 5.5bar absolute pressure / 0.5V to 4.5V output DBH-008 = 0.1 to 1.15bar absolute pressure / 0.4V to 4.65V output DBG-010 = 0.2 to 2.5bar absolute pressure / 0.2V to 4.8V output DBG-012 = 0.2 to 3bar absolute pressure / 0.4V to 4.65V output DBG-013 = 0.2 to 4bar absolute pressure / 0.2V to 4.8V output DBH-014 = 0.133 to 1.199bar absolute pressure / 1V to 4.2V output DCG-000 = 0.2 to 4bar absolute pressure / 0.4V to 4.65V output / harsh media DCH-008 = 0.1 to 1.15bar absolute pressure / 0.4V to 4.65V output / harsh media RE = Reel MLX90817LXE-DBG-001-RE Page 1 of 25 MLX90817 Absolute Pressure Sensor IC General Description Functional Diagram DSP Sensing element supply Gain & Offset Temperature Compensation On chip temperature sensor Piezoresistive sensing element Overvoltage & reverse voltage protection Voltage regulator POR Vsupply Pressure Linearization Analog driver PGA Vana OPA M U X Programmable Filter ADC DAC 16 bits Gain 12 bits Analog Output Rom InP, InN, VEXT EEPROM Test Oscillator Ram Figure 1: Functional block diagram REV 009 – 20 OCT 2020 3901090817 Test Gnd The MLX90817 is a packaged, factory calibrated, absolute pressure sensor delivering ratiometric analog output. Use of an optimized architecture and a high density CMOS technology imparts the MLX90817 with best in class automotive EMC performance. A DSP based architecture using a 16bit microcontroller provides outstanding performance in terms of initial accuracy. A smart package and die assembly concept suits applications with stringent automotive temperature and stress conditions needing small drift over life. Page 2 of 25 MLX90817 Absolute Pressure Sensor IC Contents Features and Benefits ....................................................................................................................... 1 Application Examples ........................................................................................................................ 1 Ordering Information ........................................................................................................................ 1 Functional Diagram ........................................................................................................................... 2 General Description .......................................................................................................................... 2 Glossary of Terms ............................................................................................................................. 5 Absolute Maximum Ratings .............................................................................................................. 5 Pin Definitions and Descriptions ........................................................................................................ 6 General Electrical Specifications........................................................................................................ 7 Detailed General Description .......................................................................................................... 8 Default programmed settings ......................................................................................................... 9 Default Characteristics DBG-001 ............................................................................................... 10 Default Characteristics DBG-003 ............................................................................................... 10 Default Characteristics DBH-008 ............................................................................................... 11 Default Characteristics DBG-010 ............................................................................................... 11 Default Characteristics DBG-012 ............................................................................................... 12 Default Characteristics DBG-013 ............................................................................................... 12 Default Characteristics DBH-014 ............................................................................................... 13 Default Characteristics DCG-000 ............................................................................................... 13 Default Characteristics DCH-008 ............................................................................................... 14 Filters ........................................................................................................................................... 15 PFLT ........................................................................................................................................... 15 SSF ............................................................................................................................................. 15 Analog Front End .......................................................................................................................... 16 ADC .............................................................................................................................................. 18 Digital ........................................................................................................................................... 18 Wrong Connections Overview ....................................................................................................... 19 Diagnostics ................................................................................................................................... 19 Input Diagnostics....................................................................................................................... 19 Diagnostic Sources .................................................................................................................... 20 Application Information ................................................................................................................ 21 REV 009 – 20 OCT 2020 3901090817 Page 3 of 25 MLX90817 Absolute Pressure Sensor IC PCB Land Pattern Recommendation.............................................................................................. 21 Standard information regarding manufacturability of Melexis products with different soldering processes ....................................................................................................................................... 22 ESD Precautions ............................................................................................................................ 22 Package Information for Option Codes DBx-xxx ............................................................................. 23 Package Information for Option Codes DCx-xxx ............................................................................. 24 Contact ......................................................................................................................................... 25 Disclaimer ..................................................................................................................................... 25 REV 009 – 20 OCT 2020 3901090817 Page 4 of 25 MLX90817 Absolute Pressure Sensor IC Glossary of Terms Bar: Pressure unit (1bar = 100kPa) POR: Power-on Reset ADC: Analog to Digital Converter DAC: Digital to Analog Converter DSP: Digital Signal Processor EMC: Electro Magnetic Compatibility Vbrg: Sensor bridge supply InP: Positive sensing element input InN: Negative sensing element input OV: Over Voltage UV: Under Voltage Absolute Maximum Ratings Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. Parameter Supply Voltage (overvoltage) Value 18 Units V Reverse Voltage Protection -14 V Positive output voltage 18 V Reverse output voltage -0.5 V Operating Temperature Range -40 to 150 °C Storage Temperature Range -40 to 150 °C Programming Temperature Range -40 to 125 °C 15 Bar Burst pressure (Room Temperature) Table 1: Absolute maximum ratings REV 009 – 20 OCT 2020 3901090817 Page 5 of 25 MLX90817 Absolute Pressure Sensor IC Pin Definitions and Descriptions 14 1 8 7 Figure 2: Package pinout (bottom view) Pin number 1 2 3 4 5 6 7 Description Test pin Not Connected Test pin Not Connected Test pin Not Connected Supply input Pin number 14 13 12 11 10 9 8 Description Ground Not Connected Not Connected Not Connected Ground Not Connected Output Table 2: Pin out definitions and descriptions 17VZZZ Figure 3: Package marking (top view) Symbol Function / Description V MEMS and ASIC traceability letter ZZZ Last 3 digits of ASIC lot number YY Year of assembly WW Calendar week of assembly XX Last 2 digits of the sensor lot # Table 3: Package marking definition REV 009 – 20 OCT 2020 3901090817 Page 6 of 25 MLX90817 Absolute Pressure Sensor IC General Electrical Specifications DC Operating Parameters TA = -40°C to 150°C Parameter Nominal supply voltage Nominal supply current Decoupling capacitor on supply Capacitive load on output Resistive load on output Supply programming entry level Analog POR level (rising) Analog POR hysteresis Digital POR level (rising) Digital POR hysteresis Nominal bridge supply voltage Sensing element sensitivity Diagnostic limits Max 5.5 10 47 Typ(1) 5 8.5 100 Units V mA nF Cload 47 100 470 nF Pull up or Pull down Rload Vdd_com Threshold to enter communication mode 4.7 6.2 7 7.8 kOhm V 3.1 3.5 3.9 V 500 2.7 200 +9% mV V mV V Symbol Vdd Idd Remarks No output load connected 100 2.05 10 -9% Vbrg Option codes DBG-xxx and DCG-xxx Diag low Pull-up ≥ 4.7kΩ Pull-down ≥ 4.7kΩ Pull-down ≥ 8kΩ Programmable range with 7 bit resolution Clamp for the low clamping level, 9 for the high low Clamp high Analog saturation output Vsat high Pull-up ≥ 4.7kΩ Pull-down ≥ 4.7kΩ level Clamping levels Pull-down ≥ 10kΩ Vsat low Response time 1 Pull-up ≥ 4.7kΩ Pull-down ≥ 4.7kΩ Time from reaching minimum allowed supply voltage of 4.5V till having the output within specification Time needed for the output to change from an input pressure step to 90% of its final value. Using the default filter settings PFLT=0 and SSF=1. For response times using different filter settings see Table 14. 2.3 3.5 9 18 Option codes DBH-xxx Diag high Pull-up ≥ 4.7kΩ Power up time Min 4.5 3 3 mV/V/bar mV/V/bar %Vdd 96 96 0 %Vdd 12.5 %Vdd 50 100 %Vdd 97 96 97 0 0 100 100 100 3 3 1.3 %Vdd 1 ms %Vdd ms Typical values are defined at T A = +25 °C and VDD = 5V. REV 009 – 20 OCT 2020 3901090817 Page 7 of 25 MLX90817 Absolute Pressure Sensor IC Parameter Symbol ADC resolution InP InN digital diagnostic levels Output noise Remarks Min Diagnostic thresholds of 25% of VDDA (low) and 75% of VDDA (high) Typ(1) 16 -16384 Max 16384 Units Bits lsb 2 mVrms BW limited to 50kHz. Table 4: Electrical specifications Detailed General Description The MLX90817 contains a pressure sensing element which consists of a diaphragm realized in the silicon chip by wafer bonding on an etched cavity with built in reference vacuum. The diaphragm reacts to a change in absolute pressure. The internal strain increases, in particular at the border of the diaphragm. Here, the piezo-resistive elements have been implanted into the silicon diaphragm forming a Wheatstone bridge, which act as a transducer. The electronics front end amplifies the signal from the bridge, performs a coarse offset compensation and an ADC conversion. The DSP performs the compensations over temperature. Furthermore, the digital circuit provides some filtering, the possibility to linearize the pressure signal and also implements the clamping function. This chip delivers an analog output proportional to the pressure. A broken wire detection block allows actively driving the analog output to one of the rails in case of a broken supply or ground connection. Extensive protection of the supply lines allows the MLX90817 to handle extreme overvoltage conditions and is immune to severe external disturbances. Several diagnostic functions (over-voltage, under-voltage, overpressure, under pressure detections) have been implemented on the 90817 and can be enabled by programming EEPROM settings. Figure 4 describes MLX90817 block diagram. DSP Sensing element supply Piezoresistive sensing element Gain & Offset Temperature Compensation On chip temperature sensor Overvoltage & reverse voltage protection Voltage regulator POR Vsupply Pressure Linearization Analog driver PGA Vana M U X OPA Programmable Filter ADC DAC 16 bits 12 bits Gain Analog Output Rom InP, InN, VEXT EEPROM Test Oscillator Ram Test Gnd Figure 4: MLX90817 block diagram REV 009 – 20 OCT 2020 3901090817 Page 8 of 25 MLX90817 Absolute Pressure Sensor IC Default programmed settings The MLX90817 is calibrated at the final manufacturing test step. During the calibration, settings are stored in the on chip EEPROM to define the pressure transfer curve as well as the output clamping levels. Together with the transfer functions, the IC filter values are set. The transfer curves as described below are valid assuming a supply voltage of 5V for the IC, the analog output scales in a ratiometric way to the supply voltage. Analog Output in Volt HCL O2 εp εo Absolute Pressure in Bar O1 LCL P1 P2 Figure 5: Pressure transfer function description at room temperature Temperature Factor Pressure Accuracy Fe Fc -40 -20 10 35 60 85 110 135 150 Temperature (°C) Fc Fe Figure 6: Pressure accuracy temperature factor REV 009 – 20 OCT 2020 3901090817 Page 9 of 25 MLX90817 Absolute Pressure Sensor IC Default Characteristics DBG-001 Transfer Curve Parameter Pressure 1 Pressure 2 Output 1 Output 2 Low clamping level High clamping level Pressure Accuracy Parameter Symbol Remarks P1 P2 O1 O2 LCL HCL See Figure 5: Pressure transfer function description at room temperature Symbol Remarks Output accuracy εo Pressure accuracy εp Center temperature accuracy factor Extended temperature accuracy factor Fc Overall accuracy expressed as output value (FS range from 0.5V to 4.5V) Overall accuracy expressed as pressure value See Figure 6: Pressure accuracy temperature factor Value Unit 0.5 4 0.5 4.5 0.3 4.7 Min Typ Bar Bar V V V V Max Unit -40 -1 40 1 mV %FS -35 35 mBar 1 1.5 Fe Table 5: DBG-001 Default configuration Default Characteristics DBG-003 Transfer Curve Parameter Pressure 1 Pressure 2 Output 1 Output 2 Low clamping level High clamping level Pressure Accuracy Parameter Symbol Remarks P1 P2 O1 O2 LCL HCL See Figure 5: Pressure transfer function description at room temperature Symbol Remarks Output accuracy εo Pressure accuracy εp Center temperature accuracy factor Extended temperature accuracy factor Fc Overall accuracy expressed as output value (FS range from 0.5V to 4.5V) Overall accuracy expressed as pressure value See Figure 6: Pressure accuracy temperature factor Value Unit 0.2 5.5 0.5 4.5 0 5 Min Max Unit -40 -1 40 1 mV %FS -53 53 mBar Fe Typ Bar Bar V V V V 1 1.5 Table 6: DBG-003 Default configuration REV 009 – 20 OCT 2020 3901090817 Page 10 of 25 MLX90817 Absolute Pressure Sensor IC Default Characteristics DBH-008 Transfer Curve Parameter Pressure 1 Pressure 2 Output 1 Output 2 Low clamping level High clamping level Pressure Accuracy Parameter Symbol Remarks P1 P2 O1 O2 LCL HCL See Figure 5: Pressure transfer function description at room temperature Symbol Remarks Output accuracy εo Pressure accuracy εp Center temperature accuracy factor Extended temperature accuracy factor Fc Overall accuracy expressed as output value (FS range from 0.5V to 4.5V) Overall accuracy expressed as pressure value See Figure 6: Pressure accuracy temperature factor Value Unit 0.1 1.15 0.4 4.65 0.3 4.7 Min Typ Bar Bar V V V V Max Unit -50 -1.25 50 1.25 mV %FS -12.5 12.5 mBar 1 1.5 Fe Table 7: DBH-008 Default configuration Default Characteristics DBG-010 Transfer Curve Parameter Pressure 1 Pressure 2 Output 1 Output 2 Low clamping level High clamping level Pressure Accuracy Parameter Symbol Remarks P1 P2 O1 O2 LCL HCL See Figure 5: Pressure transfer function description at room temperature Symbol Remarks Output accuracy εo Pressure accuracy εp Center temperature accuracy factor Extended temperature accuracy factor Fc Overall accuracy expressed as output value (FS range from 0.5V to 4.5V) Overall accuracy expressed as pressure value See Figure 6: Pressure accuracy temperature factor Value Unit 0.2 2.5 0.2 4.8 0 5 Min Max Unit -65 -1.63 65 1.63 mV %FS -33 33 mBar Fe Typ Bar Bar V V V V 1 1.5 Table 8: DBG-010 Default configuration REV 009 – 20 OCT 2020 3901090817 Page 11 of 25 MLX90817 Absolute Pressure Sensor IC Default Characteristics DBG-012 Transfer Curve Parameter Pressure 1 Pressure 2 Output 1 Output 2 Low clamping level High clamping level Pressure Accuracy Parameter Symbol Remarks P1 P2 O1 O2 LCL HCL See Figure 5: Pressure transfer function description at room temperature Symbol Remarks Output accuracy εo Pressure accuracy εp Center temperature accuracy factor Extended temperature accuracy factor Fc Overall accuracy expressed as output value (FS range from 0.5V to 4.5V) Overall accuracy expressed as pressure value See Figure 6: Pressure accuracy temperature factor Value Unit 0.2 3 0.4 4.65 0 5 Min Typ Bar Bar V V V V Max Unit -50 -1.25 50 1.25 mV %FS -33 33 mBar 1 1.5 Fe Table 9: DBG-012 Default configuration Default Characteristics DBG-013 Transfer Curve Parameter Pressure 1 Pressure 2 Output 1 Output 2 Low clamping level High clamping level Pressure Accuracy Parameter Symbol Remarks P1 P2 O1 O2 LCL HCL See Figure 5: Pressure transfer function description at room temperature Symbol Remarks Output accuracy εo Pressure accuracy εp Center temperature accuracy factor Extended temperature accuracy factor Fc Overall accuracy expressed as output value (FS range from 0.5V to 4.5V) Overall accuracy expressed as pressure value See Figure 6: Pressure accuracy temperature factor Value Unit 0.2 4 0.2 4.8 0 5 Min Max Unit -65 -1.63 65 1.63 mV %FS -54 54 mBar Fe Typ Bar Bar V V V V 1 1.5 Table 10: DBG-013 Default configuration REV 009 – 20 OCT 2020 3901090817 Page 12 of 25 MLX90817 Absolute Pressure Sensor IC Default Characteristics DBH-014 Transfer Curve Parameter Pressure 1 Pressure 2 Output 1 Output 2 Low clamping level High clamping level Pressure Accuracy Parameter Symbol Remarks P1 P2 O1 O2 LCL HCL See Figure 5: Pressure transfer function description at room temperature Symbol Remarks Output accuracy εo Pressure accuracy εp Center temperature accuracy factor Extended temperature accuracy factor Fc Overall accuracy expressed as output value (FS range from 0.5V to 4.5V) Overall accuracy expressed as pressure value See Figure 6: Pressure accuracy temperature factor Value Unit 0.133 1.199 1 4.2 0 5 Min Typ Bar Bar V V V V Max Unit -45 -1.13 45 1.13 mV %FS -15 15 mBar 1 1.5 Fe Table 11: DBH-014 Default configuration Default Characteristics DCG-000 Transfer Curve Parameter Pressure 1 Pressure 2 Output 1 Output 2 Low clamping level High clamping level Pressure Accuracy Parameter Symbol Remarks P1 P2 O1 O2 LCL HCL See Figure 5: Pressure transfer function description at room temperature Symbol Remarks Output accuracy εo Pressure accuracy εp Center temperature accuracy factor Extended temperature accuracy factor Fc Overall accuracy expressed as output value (FS range from 0.5V to 4.5V) Overall accuracy expressed as pressure value See Figure 6: Pressure accuracy temperature factor Value Unit 0.2 4 0.4 4.65 0.3 4.7 Min Max Unit -32 -0.8 32 0.8 mV %FS -28.6 28.6 mBar Fe Typ Bar Bar V V V V 1 1.5 Table 12: DCG-000 Default configuration REV 009 – 20 OCT 2020 3901090817 Page 13 of 25 MLX90817 Absolute Pressure Sensor IC Default Characteristics DCH-008 Transfer Curve Parameter Pressure 1 Pressure 2 Output 1 Output 2 Low clamping level High clamping level Pressure Accuracy Parameter Symbol Remarks P1 P2 O1 O2 LCL HCL See Figure 5: Pressure transfer function description at room temperature Symbol Remarks Output accuracy εo Pressure accuracy εp Center temperature accuracy factor Extended temperature accuracy factor Fc Overall accuracy expressed as output value (FS range from 0.5V to 4.5V) Overall accuracy expressed as pressure value See Figure 6: Pressure accuracy temperature factor Value Unit 0.1 1.15 0.4 4.65 0.3 4.7 Min Max Unit -50 -1.25 50 1.25 mV %FS -12.5 12.5 mBar Fe Typ Bar Bar V V V V 1 1.5 Table 13: DCH-008 Default configuration REV 009 – 20 OCT 2020 3901090817 Page 14 of 25 MLX90817 Absolute Pressure Sensor IC Filters There are two filters available to filter the pressure signal. The first filter is a Small Signal Filter which can be disabled or enabled. The second filter is a first order low pass filter for the pressure signal which has a programmable depth. PFLT PFLT is a programmable first order low pass filter. The depth of this filter can be selected. This filter can be configured to select the optimal trade-off between response time and output noise. The low pass filter is implemented according to the following formula: 𝐹𝑖𝑙𝑡𝑒𝑟𝑜𝑢𝑡𝑝𝑢𝑡 (𝑘) = 𝐹𝑖𝑙𝑡𝑒𝑟𝑖𝑛𝑝𝑢𝑡 (𝑘) − 𝐹𝑖𝑙𝑡𝑒𝑟𝑜𝑢𝑡𝑝𝑢𝑡 (𝑘 − 1) + 𝐹𝑖𝑙𝑡𝑒𝑟𝑜𝑢𝑡𝑝𝑢𝑡 (𝑘 − 1) 2𝑃𝐹𝐿𝑇 The PFLT parameter in the formula is set in EEPROM and can have a value between 0 and 9. An overview of typical response times when applying a step on the input using different PFLT filter settings can be found in Table 14. Filter setting 0 disables the PFLT. PFLT setting 0 1 2 3 4 5 6 7 8 9 Response time in ms(2) 0.93 1.25 2 3.7 7.1 13.7 27.0 53.8 106.8 203.8 Table 14: Filter settings and typical response times SSF The SSF (Small Signal Filter) is a digital filter which is designed not to have an impact on the response time of a fast changing pressure signal like a pressure step. When a large signal change at the input is present, the filter is bypassed and not filtering the signal. For small signal changes, which are in most cases noise, the filter is used and filtering the pressure signal. The Small Signal Filter can be enabled or disabled in EEPROM. 2 Time needed for the output to change from an input pressure step to 90% of its final value. REV 009 – 20 OCT 2020 3901090817 Page 15 of 25 MLX90817 Absolute Pressure Sensor IC Analog Front End The analog front end of the MLX90817 consists of a chopping stage and 3 amplification stages as can be seen in Figure 7. There are also several input diagnostics integrated into this front end to be able to detect a broken InP or InN connection or an input which is out of range. This diagnostic information is transferred to the microcontroller to handle further action for example flagging a diagnostic message. G = 4.5 to 10.5 3 bits G = 1.25 or 3.5 CSOF: 1/3 to 2/3 of VDDA G = 1.6, 3.2 or 6.4 InP Input Diag nostics InN OPA Chopping 1us/phase Stage 1: Instrumentation amplifier OPA Stage 2: Differential amplifier Stage 3: Integrator Figure 7: Analog front end block diagram The first stage is an instrumentation amplifier of which the gain can be programmed using 3 bits to cover a gain range between 4.5 and 10.6. Transfer equation: OUTP1 – OUTN1 = Gst1*(InP – InN) in phase 1 OUTP1 – OUTN1 = Gst1*(InN – InP) in phase 2 The second stage is a fully differential amplifier. The gain of the amplifier can be calibrated using 1 bit. Transfer equation: OUTP2 – OUTN2 = -Gst2*(OUTP1 – OUTN1) – Gst2*(CSOF1 – CSOF2) in phase 1 OUTP2 – OUTN2 = -Gst2*(OUTN1 – OUTP1) – Gst2*(CSOF2 – CSOF1) in phase 2 The CSOF1 and CSOF2 signals are generated by the coarse offset DAC with the following transfer functions: VDDA  2 1  VDDA CO[6 : 0] CO 7 + (− 1) *  −  * * 2 2 127  3 3 VDDA 1  VDDA CO[6 : 0] CO 7  2 CSOF 2 = − (− 1) *  −  * * 2 2 127  3 3 CSOF1 = CO[6:0] fixes the DAC output. CO7 is used for the polarity. The third stage is an integrator which is controlled using 2 bits to set a gain between 1.6 and 6.4 Transfer equation at the outputs of the amplifier: OUTP3 – OUTN3 = -N*(C1/C2)*(OUTP2 – OUTN2) OUTP3_common_mode and OUTN3_common_mode = VCM = VDDA/2 In this equation N represents the number of integration cycles which is a fixed value of N = 40. C2 is a fixed feedback capacitor of approximately 5pF. C1 can have 3 different values: 0.2pF, 0.4pF or 0.8pF. Transfer equation after the ADC: Pressure_ADC = ((OUTN3 – OUTP3)*216/VDDA) + 32768 REV 009 – 20 OCT 2020 3901090817 Page 16 of 25 MLX90817 Absolute Pressure Sensor IC An overview of all possible values for Gst1, Gst2 and Gst3 can be found in Table 15 below. The input stage is designed to work with an input common-mode voltage range between 42%Vbrg and 58%Vbrg. Gain setting [-] 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Gst1 [V/V] 4.49 5.06 5.8 6.52 7.43 8.37 9.35 10.6 4.49 5.06 5.8 6.52 7.43 8.37 9.35 10.6 4.49 5.06 5.8 6.52 7.43 8.37 9.35 10.6 4.49 5.06 5.8 6.52 7.43 8.37 9.35 10.6 Gst2 [V/V] -1.25 -1.25 -1.25 -1.25 -1.25 -1.25 -1.25 -1.25 -3.5 -3.5 -3.5 -3.5 -3.5 -3.5 -3.5 -3.5 -3.5 -3.5 -3.5 -3.5 -3.5 -3.5 -3.5 -3.5 -3.5 -3.5 -3.5 -3.5 -3.5 -3.5 -3.5 -3.5 Gst3 [V/V] 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 6.4 6.4 6.4 6.4 6.4 6.4 6.4 6.4 Total gain [V/V] -9.0 -10.1 -11.6 -13.0 -14.9 -16.7 -18.7 -21.2 -25.1 -28.3 -32.5 -36.5 -41.6 -46.9 -52.4 -59.4 -50.3 -56.7 -65.0 -73.0 -83.2 -93.7 -104.7 -118.7 -100.6 -113.3 -129.9 -146.0 -166.4 -187.5 -209.4 -237.4 FS Differential input signal [mV] ± 195 ± 173 ± 151 ± 134 ± 118 ± 105 ± 94 ± 83 ± 70 ± 62 ± 54 ± 48 ± 42 ± 37 ± 33 ± 29 ± 35 ± 31 ± 27 ± 24 ± 21 ± 19 ± 17 ± 15 ± 17 ± 15 ± 13 ± 12 ± 11 ±9 ±8 ±7 Table 15: Gain and input signal range of the analog front end REV 009 – 20 OCT 2020 3901090817 Page 17 of 25 MLX90817 Absolute Pressure Sensor IC ADC The 16 bit differential ADC has a range from –VDDA/2 to +VDDA/2. There are 7 different ADC channels. Channel 0 is not used. Table 16 below describes all the channels. ADC SIN[2:0] 0 1 2 3 4 5 6 7 Signal Remarks P Tint Vsup InP/InN Vdig Tntc Text Nothing connected Pressure Internal Temperature External Supply Multiplexing between Positive/Negative Sensor Output Digital Regulator NTC Output External Temperature Table 16: ADC channels The different channels are converted in a constantly repeating sequence. A new ADC conversion is done every 50us following the sequence shown below in Figure 8. This is resulting in an updated pressure output value every 200us. P Tint P Text P Tntc P Vsup P Tint P Text P Tntc P InP/InN P Tint P ... Figure 8: ADC sequence Digital The digital is built around a 16-bit microcontroller. It contains besides the processor also ROM, RAM and EEPROM and a set of user and system IO registers. Temperature compensation of the pressure signal and pressure linearization is handled by the microcontroller. For the pressure compensation there are EEPROM parameters allocated to be able to cover a large variety of calibration approaches. Both for gain and offset of the pressure signal, there is a separate temperature dependency programmable ranging from a temperature independence to a first order, second order and finally a third order compensation. This is reflected in EEPROM parameters for the offset (O0, O1, O2 and O3) and for the gain (G0, G1, G2 and G3). If required, the linearity of the pressure signal can also be compensated without a temperature dependency or with a first order temperature dependency through EEPROM parameters L0 and L1. REV 009 – 20 OCT 2020 3901090817 Page 18 of 25 MLX90817 Absolute Pressure Sensor IC Wrong Connections Overview Table 17 provides an overview of the behavior of the MLX90817 when different combinations of connections to GND, VDD and OUT are made. GND VDD Analog out Effect on output 0V Disconnected 0V 0V 5V 5V Disconnected 5V Pull-down or Pull-up Pull-down or Pull-up Pull-down or Pull-up Disconnected 0V 0V 0V 0V 0V 5V 5V 5V 0V 18V 0V 5V 18V Pull-down or Pull-up Pull-down or Pull-up 5V 5V 5V 0V Pull-down or Pull-up Pull-down or Pull-up Normal operation High Fault Band Low Fault Band Low Fault Band for Pull-down High Fault Band for Pull-up Low Fault Band High Fault Band 18V Low Fault Band Low Fault Band for Pull-down High Fault Band for Pull-up High Fault Band Action after wrong connection Normal operation Normal operation Normal operation Normal operation Normal operation Normal operation Normal operation Normal operation Normal operation Normal operation Normal operation Table 17: Wrong connections overview Diagnostics Input Diagnostics An overview of the different input diagnostics conditions and their corresponding fault band and diagnostic source can be found in Table 18. Condition Vbrg disconnected GND (sensor) disconnected InP disconnected InN disconnected Vbrg shorted to GND InP shorted to GND InN shorted to GND InP shorted to Vbrg InN shorted to Vbrg Fault Band Low Low Low Low Low Low Low Low Low Diagnostic Source ERR_EN_SPSN ERR_EN_SPSN ERR_EN_BW ERR_EN_BW ERR_EN_SPSN ERR_EN_SPSN ERR_EN_SPSN ERR_EN_SPSN ERR_EN_SPSN Table 18: Input diagnostics REV 009 – 20 OCT 2020 3901090817 Page 19 of 25 MLX90817 Absolute Pressure Sensor IC Diagnostic Sources The MLX90817 product has several internal checks which monitor the status of device. These checks or diagnostic sources can be enabled or disabled based on the sensor module requirements. An overview of the different diagnostic sources, their enable/disable parameter and the explanation of their functionality can be found below in Table 19. The default diagnostic configuration for the different option codes can be found in Table 20. Parameter ERR_EN_TINT ERR_EN_IO ERR_EN_SPSN ERR_EN_PV ERR_EN_PP ERR_EN_BW ERR_EN_VSUPH ERR_EN_VSUPL ERR_EN_TCHIP Error condition The Internal temperature could not be measured/calculated RAM configuration error SP or SN pin voltage out of range The pressure value could not be measured/calculated Pressure parameter error A broken wire is detected in the pressure sensor path The supply voltage is too high The supply voltage is too low The chip temperature out of range Table 19: Diagnostic sources Parameter ERR_EN_TINT ERR_EN_IO ERR_EN_SPSN ERR_EN_PV ERR_EN_PP ERR_EN_BW ERR_EN_VSUPH ERR_EN_VSUPL ERR_EN_TCHIP Dxx001  Dxx003  Dxx008  Dxx010  Dxx012  Dxx013  ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓             ✓ ✓ ✓ ✓ ✓ ✓ Dxx014          Dxx000  ✓ ✓ ✓ ✓ ✓   ✓ Table 20: Default diagnostic configuration The level of the over and under voltage diagnostics can be configured according to the ranges described in Table 21. Parameter Under voltage detection threshold range Overvoltage detection threshold range Over-/Under-voltage detection accuracy Min Max Units 3.25 5.74 V 4.25 6.74 V 200 mV Comment Optional and Programmable with 8 bits in parameter VSUP_LOW Optional and Programmable with 8 bits in parameter VSUP_HIGH Table 21: MLX90817 under and overvoltage detection REV 009 – 20 OCT 2020 3901090817 Page 20 of 25 MLX90817 Absolute Pressure Sensor IC Application Information Application schematic OUT MLX90817 VDD 100nF 100nF GND Figure 9: Basic application schematic These recommendations for external components are only providing a basic protection. Depending on the module design and the EMC speciation requirements different configurations can be needed. PCB Land Pattern Recommendation Figure 10: PCB Land Pattern REV 009 – 20 OCT 2020 3901090817 Page 21 of 25 MLX90817 Absolute Pressure Sensor IC Standard information regarding manufacturability of Melexis products with different soldering processes Our products are classified and qualified regarding soldering technology, solderability and moisture sensitivity level according to following test methods: Reflow Soldering SMD’s (Surface Mount Devices) ▪ ▪ IPC/JEDEC J-STD-020 Moisture/Reflow Sensitivity Classification for Nonhermetic Solid State Surface Mount Devices (classification reflow profiles according to table 5-2) EIA/JEDEC JESD22-A113 Preconditioning of Nonhermetic Surface Mount Devices Prior to Reliability Testing (reflow profiles according to table 2) Wave Soldering SMD’s (Surface Mount Devices) and THD’s (Through Hole Devices) ▪ ▪ EN60749-20 Resistance of plastic- encapsulated SMD’s to combined effect of moisture and soldering heat EIA/JEDEC JESD22-B106 and EN60749-15 Resistance to soldering temperature for through-hole mounted devices Iron Soldering THD’s (Through Hole Devices) ▪ EN60749-15 Resistance to soldering temperature for through-hole mounted devices Solderability SMD’s (Surface Mount Devices) and THD’s (Through Hole Devices) ▪ EIA/JEDEC JESD22-B102 and EN60749-21 Solderability For all soldering technologies deviating from above mentioned standard conditions (regarding peak temperature, temperature gradient, temperature profile etc) additional classification and qualification tests have to be agreed upon with Melexis. The application of Wave Soldering for SMD’s is allowed only after consulting Melexis regarding assurance of adhesive strength between device and board. Melexis is contributing to global environmental conservation by promoting lead free solutions. For more information on qualifications of RoHS compliant products (RoHS = European directive on the Restriction Of the use of certain Hazardous Substances) please visit the quality page on our website: http://www.melexis.com/quality.aspx ESD Precautions Electronic semiconductor products are sensitive to Electro Static Discharge (ESD). Always observe Electro Static Discharge control procedures whenever handling semiconductor products. REV 009 – 20 OCT 2020 3901090817 Page 22 of 25 MLX90817 Absolute Pressure Sensor IC Package Information for Option Codes DBx-xxx Figure 11: MLX90817 package drawing option codes DBx-xxx REV 009 – 20 OCT 2020 3901090817 Page 23 of 25 MLX90817 Absolute Pressure Sensor IC Package Information for Option Codes DCx-xxx Figure 12: MLX90817 package drawing option codes DCx-xxx REV 009 – 20 OCT 2020 3901090817 Page 24 of 25 MLX90817 Absolute Pressure Sensor IC Contact For the latest version of this document, go to our website at www.melexis.com. For additional information, please contact our Direct Sales team and get help for your specific needs: Europe, Africa Telephone: +32 13 67 04 95 Email : sales_europe@melexis.com Americas Telephone: +1 603 223 2362 Email : sales_usa@melexis.com Asia Email : sales_asia@melexis.com Disclaimer The content of this document is believed to be correct and accurate. However, the content of this document is furnished "as is" for informational use only and no representation, nor warranty is provided by Melexis about its accuracy, nor about the results of its implementation. Melexis assumes no responsibility or liability for any errors or inaccuracies that may appear in this document. Customer will follow the practices contained in this document under its sole responsibility. This documentation is in fact provided without warranty, term, or condition of any kind, either implied or expressed, including but not limited to warranties of merchantability, satisfactory quality, non-infringement, and fitness for purpose. Melexis, its employees and agents and its affiliates' and their employees and agents will not be responsible for any loss, however arising, from the use of, or reliance on this document. Notwithstanding the foregoing, contractual obligations expressly undertaken in writing by Melexis prevail over this disclaimer. 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The confidentiality obligations set forth in this disclaimer will have indefinite duration and in any case they will be effective for no less than 10 years from the receipt of this document. This disclaimer will be governed by and construed in accordance with Belgian law and any disputes relating to this disclaimer will be subject to the exclusive jurisdict ion of the courts of Brussels, Belgium. The invalidity or ineffectiveness of any of the provisions of this disclaimer does not affect the validity or effectiveness of the other provisions. The previous versions of this document are repealed. Melexis © - No part of this document may be reproduced without the prior written consent of Melexis. (2020) IATF 16949 and ISO 14001 Certified REV 009 – 20 OCT 2020 3901090817 Page 25 of 25