Advanced Microsystems Automotive Applications 2004 by Jürgen Valldorf, Wolfgang Gessner

By Jürgen Valldorf, Wolfgang Gessner

Microsystems functions (MST) in autos became normal: they allow the advent of a chain of recent features and even as the substitute of current applied sciences delivering more desirable functionality and higher worth for cash. Microsystems are fundamental for pleasant a whole transition from the automatically pushed vehicle method to a routinely dependent yet ICT-driven process as a part of a likewise complicated surroundings. With the advent of micro-systems a sequence of demanding situations come up concerning complexity, structures layout, reliability, serviceability, and so on. those demanding situations need to be addressed to be able to meet excessive shopper expectancies pertaining to functionality and cost.

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A block diagram of the circuit is shown in figure 2. The system uses an 11-bit A/D converter with 8x over-sampling to provide for an effective 14-bit data conversion resolution. Data is then processed thru an on-board Digital Signal Processor (DSP) where the A/D data is corrected, based on stored calibration coefficients stored in the on-board EEPROM. The corrected signal is then fed to a 12-bit D/A converter, which in turn drives the output amplifier. The amplifier has been designed to be able to drive >2 nF of capacitance as needed for EMF suppression in the automotive environment.

Figures 3, 4, and 5 show data from sensors before and after correction by the circuitry. The data in figure 4 shows the ability of the signal processor to compensate for pressure non-linearity, over at temperature range of -20ºC to +110ºC. 2% for temperature coefficient of zero error, even when the sensor exhibits a 2nd order non-linearity in the temperature coefficient of zero. Low-Cost, Single-Chip Amplified Pressure Sensor in a Moulded Package for Tire Pressure Measurement Figure 5 represents the corrected temperature coefficient of span.

25 26 Safety Temperature Measure (2) - The event must power up the sensing element, convert its variation to a voltage, store that result using a sample and hold capacitor and then shut down. Voltage Measure (3) - The voltage measurement is primarily to monitor the battery. It is done using a voltage threshold comparator for the minimum battery voltage. There must also be a fairly accurate voltage reference. This event must power up the voltage reference and the comparator, store the result and then shut down.

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