"In the car, the first thing is to adjust and process the signals such as the external position and angle. The second is to analyze the signals and then realize the control. Therefore, for semiconductor manufacturers, the processor and power devices are not all of the automotive electronics. The converter is equally important for the advancement of technology.†Shen Fei, system application manager of ADI Automotive Electronics Marketing Department, made the above introduction at a media meeting held recently.
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It is understood that ADI focuses on green energy, safety and comfort in the automotive electronics field. By combining converter technology with amplifiers, MEMS, sensors, digital processors, RF and power technologies, ADI's automotive electronics The business is growing rapidly and already accounts for 20% of its overall business.
Three application cases illustrate the innovations brought by ADI converter technology.
The first example is for safety applications. MEMS sensors used in airbags and ESC systems need to meet high performance requirements, including standardized digital interfaces, wider range, configurable filter frequency, continuous self-test, temperature. Traditional MEMS sensors do not adequately meet these requirements for compensation and offset compensation. Through the creative introduction of the ADC architecture, ADI achieves these functions. Shen Fei explained that the self-test function has been carried out by means of external process judgment, but the ADC and the filter are integrated inside the sensor to facilitate the safe operation of the device with the main decision-making right. At the same time, the original signal can be analyzed and the signal can be transmitted. For the internal control circuit, different ranges of control can be realized by configuring the filter.
The second case is the application of the converter in a battery monitoring system. In order to save energy, more and more cars are beginning to use the engine automatic start-stop system. When it is congested or waiting for a red light, it can judge the external situation and automatically turn off or start, which can save about 5%~10% of fuel consumption. To ensure that the engine can start continuously without damaging itself, accurate sensors are needed to monitor battery status. ADI's ADuC703x family of precision analog microcontrollers integrates a 16-bit sigma-delta ADC for more precise signal conditioning to meet precise control at different power levels. It is foreseeable that the next step in automotive precision battery monitoring is the integration of ADCs, MCUs, and LIN transceivers. Previously only battery sensors equipped with high-end vehicles will become more and more popular in low-end models in the future.
The third is in the application of pressure sensors, whether it is exhaust pressure test or oil pressure test, the sensor is installed in the vicinity of oil circuit and pipeline, the working environment is bad, and there are many external error sources, so signal processing and sensors need strong elimination. Error mechanism. ADI adds variable gain amplifiers, filters, and ADC and DAC architectures to the traditional signal chain. By combining with external devices, it can achieve 1/1000 pressure measurement accuracy.
Shen Fei added that not only the above applications, including in-vehicle entertainment, powertrain and chassis control, but also the introduction of the ADC architecture, independent converters will be less and less in the body, more will be in the form of integration. ADI is a leader in converter technology, with a market share that exceeds the sum of its next ten companies. By integrating it with different devices, significant performance gains can be achieved. ADI believes this technology will be in the automotive electronics arena. There will be more use.
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