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An interface IC for remote automotive sensors, linking crash sensors in the driver and passenger door with the main airbag unit in the dashboard. Two identical channels supply the external sensors and receive digital information via one active wire each. The interface supplies the external sensors with a preregulated smoothed voltage; the external units transmit the digital information back to the interface by current modulation.The device is designed for the highest data transmission security in harsh automotive environments, with high immunity against cross-coupling between the two channels.