MLX90329 Automotive Sensor Interfaces 1. Features and Benefits 2. Application Examples Sensor interface IC for use in harsh Piezoresistive automotive pressure sensors automotive environments interface High EMC robustness Sensors based on Wheatstone bridge Possibilities to achieve outstanding overall resistors sensor performances SENT output with option for pressure, calibrated on chip or external NTC temperature information Outstanding accuracy for factory calibrated NTC within 1C 3. Ordering information Product Code Temperature Package Option Code Packing Code Code Form Code MLX90329 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: MLX90329LDC-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 Gain & Offset Voltage regulator sensor current output Temperature POR Compensation On chip temperature sensor SENT Piezoresistive Pressure Linearization driver sensing element Vbrg Vext PGA Programmable Filter Vana InP M Slew ADC SENT Temperature conditioning OPA U rate 16 bits control Output X Rom InN SE1, SE2, VEXT NTC NTC interface EEPROM and linearization Test Test N T Ram C Oscillator Gnd Figure 1: Functional block diagram REVISION 002 22 DECEMBER 2017 Page 1 of 31 3901090329 MLX90329 Automotive Sensor Interfaces 5. General Description The MLX90329 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 MLX90329 is programmed with a single wire serial interface through the output pin. The user can specify SENT fast channel configuration, slow channel messages and enable several diagnostic settings. By intercepting these various fault modes, the MLX90329 is able to inform about the reliability of its output signal. REVISION 002 22 DECEMBER 2017 Page 2 of 31 3901090329