MLX90328 Automotive Sensor Interface 1. Features and Benefits 2. Application Examples Sensor interface IC for use in harsh Piezoresistive automotive pressure sensors automotive environments interface Possibilities to achieve outstanding overall Sensors based on Wheatstone bridge sensor performances resistors Ratiometric Analog Output 3. Ordering information Product Code Temperature Package Option Code Packing Code Code form Code MLX90328 L DC DBA-000 RE Legend: Temperature Code: L (-40C to 150C) Package Code: DC = SOIC-8 Plastic Small Outline, 150 mil Option Code: DBA-000 Packing Form: RE = Reel Ordering example: MLX90328LDC-DBA-000-RE 4. Functional Diagram DSP Overvoltage & Vsupply reverse voltage Divided bridge Sensor bias protection 6/7 VDDA current Off chip temperature IV conversion Voltage regulator Gain & Offset sensor current output POR Temperature On chip temperature Compensation sensor Piezoresistive sensing element Pressure Linearization Vbrg Analog PGA driver Vana InP M Programmable Filter U ADC Analog DAC OPA Gain 16 bits 12 bits X Output Rom InN InP, InN, VEXT EEPROM Test Test Ram Oscillator Gnd Figure 1: Functional block diagram 5. General Description The MLX90328 covers the most typical resistive type of Wheatstone bridge applications for use in an automotive environment. It is a mixed signal sensor interface IC that converts small changes in resistors, configured in a full Wheatstone bridge on a sensing element, to large output voltage variations. The signal conditioning includes gain adjustment, offset control as well as temperature compensation in order to accommodate variations of the different resistive sensing elements. Compensation values are stored in EEPROM and can be reprogrammed with a Melexis tool including the necessary software. The MLX90328 is programmed with a single wire serial interface through the output pin. REVISION 006 22 DECEMBER 2017 Page 1 of 16 3901090328 MLX90328 Automotive Sensor Interface Contents 1. Features and Benefits ............................................................................................................................ 1 2. Application Examples ............................................................................................................................. 1 3. Ordering information ............................................................................................................................. 1 4. Functional Diagram ................................................................................................................................ 1 5. General Description ............................................................................................................................... 1 6. Glossary of Terms................................................................................................................................... 3 7. Absolute Maximum Ratings.................................................................................................................... 3 8. Pin Definitions and Descriptions ............................................................................................................. 3 9. General Electrical Specifications ............................................................................................................. 4 10. Filters ................................................................................................................................................... 6 10.1. PFLT .................................................................................................................................................... 6 10.2. SSF ...................................................................................................................................................... 6 11. Analog Front End.................................................................................................................................. 7 12. ADC ...................................................................................................................................................... 9 13. Digital ................................................................................................................................................... 9 14. Wrong Connections Overview ............................................................................................................ 10 15. Diagnostics ......................................................................................................................................... 11 15.1. Input Diagnostics ............................................................................................................................ 11 15.2. Diagnostic Sources ......................................................................................................................... 11 16. Unique Features ................................................................................................................................. 12 17. Application Information ..................................................................................................................... 13 18. Standard information regarding manufacturability of Melexis products with different soldering processes ............................................................................................................................. 14 19. ESD Precautions ................................................................................................................................. 14 20. Package Information .......................................................................................................................... 15 21. Contact .............................................................................................................................................. 16 22. Disclaimer .......................................................................................................................................... 16 REVISION 006 22 DECEMBER 2017 Page 2 of 16 3901090328