VTI offers unique sensor solution for use in vehicles
Single or multi-axis measurement in the same package
VTI's new digital accelerometer component platform offers the same performance in any measuring direction relative to its mounting plane or the vehicle. Products include 1-, 2- and 3-axis sensors (x, y, z, x-y, x-z, y-z, x-y-z). This gives flexibility for optimum measurement location, easy assembly into the vehicle and resulting increasing system performance and cost and time savings. Enablers for this are VTI's 3D MEMS advanced micromachining technology, modern intelligent interface ASIC technology and robust and reliable automotive component packaging. All products are specified for -40...+125°C operation and qualified according to AEC-Q100.
Figure: Examples of VTI's 1-, 2- and 3-axis digital automotive accelerometers in Dual Flat Lead (DFL) package (7 x 8.8 x 3.3 mm).
Accurate, stable, durable and small in size
Products based on the digital platform have the same excellent features as VTI's previous products, robustness against mechanical shocks and stability and accuracy in automotive environments. VTI's 3D MEMS technology provides a large accurate signal out of the sensing element together with controlled damping for optimum frequency response.
Accuracy has been brought to a new level meeting toughest requirements of inclination measurement in automotive EPB (Electric Paring Brake) and HSA (Hill Start Assistant) applications. The resolution allows for passenger detection based on heart beat. VTI has reduced the size of its automotive grade packaging down to 7 x 8.8 x 3.3mm, even for multi-axis measurement.
Standard interface
The pin-out in all products of the digital platform is the same. They communicate over a standard SPI (Serial Peripheral Interface) bus. Supply voltage is 3.3V ± 10%, making the platform compatible with modern controller systems.
Continuous diagnostics
VTI has introduced continuous self diagnostics in its new digital platform. Diagnostics includes non-volatile memory checksum, parity bit in acceleration data output and acceleration data plausibility check to detect even minimal changes in parameter values.
Applications
Target applications for the digital platform include acceleration and inclination measurements in Electronic Stability Control (ESC), Hill Start Assistant (HSA), Electronic Parking Brake (EPB), Roll Stability Control, Roll-Over Detection and Electrically Controlled Suspension. The multiple options for each car platform can be covered with one ECU (Electrical Control Unit) or sensor cluster design by selecting the appropriate sensor version from VTI's new accelerometer series.