The MLX90320 covers the most typical resistive type of Wheatstone bridge applications for use in an automotive environment. The MLX90320 can be used with almost any type of resistive bridge sensor without the need of any additional signal conditioning.
It is a monolithic silicon analog sensor interface 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 and second order temperature compensation in order to accommodate variations of the different resistive sensing elements.
The differential input signal is offset compensated and amplified to achieve the desired output voltage. With a coarse gain calibration the MLX90320 can easily accommodate sensor output spans in the 1.8mV/V to 63mV/V range to achieve 4 V output span.
Compensation values are stored in EEPROM and can be reprogrammed with an interface circuit and provided software. The MLX90320 is programmed with a single wire serial interface through the output pin.
By intercepting various fault modes the MLX90320 is able to inform about the reliability of its analog output signal.