MLX90821 Relative Pressure Sensor IC Default programmed settings The MLX90821 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. On MLX90821 devices using the SENT output, besides pressure, the internal temperature and optionally the NTC temperature calibrations are performed. Together with the transfer functions, the IC filter values are set. The analog output 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. Output HCL O2 εp εo Relative Pressure O1 in Bar LCL P1 P2 Figure 4: 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 5: Pressure accuracy temperature factor (temperature code L) REV 002 – 17 OCT 2019 Page 10 of 39 3901090821
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