High-precision turbo MAP sensor has SENT interface

June 18, 2019 //By Christoph Hammerschmidt
High-precision turbo MAP sensor has SENT interface
Infineon has designed the Xensiv KP276 pressure sensor for measuring Manifold Air Pressure (MAP) in naturally aspirated or turbocharged diesel and gasoline engines as well as in exhaust gas recirculation. The digital sensor has a pressure measuring range from 10kPa to 400kPa and enables very precise, fast measurements and fast communication through its SENT interface.

The intake manifold absolute pressure is an important parameter for calculating the fuel-air mixture for the engine. A more precise measurement contributes to a more efficient combustion process and thus lower emissions. In addition, pressure data obtained from the sensor are used to determine leaks or malfunctions of the EGR valve (exhaust gas recirculation).

With an accuracy error of low 0.77 % (full pressure range, FSS) over the lifetime, the XENSIV KP276 products are currently the most accurate digital Turbo MAP sensors available from Infineon. An even more precise product version with 0.5 percent FSS is planned. In addition, this version will also be designed for ISO26262 - with all the analyses and documentation required for safety-critical applications.

XENSIV KP276 sensors integrate signal processing for an external NTC temperature sensor. This allows both pressure and temperature signals to be provided via a single digital interface.

The sensors feature a SENT (Single Edge Nibble Transmission) interface with a very short frame length of only 846 µs and a fast NTC start-up time of typically 10 ms. This reduces measurement time and data transfer time compared to previous products.

The sensors are offered in a rugged SMD-8 package and are designed for harsh engine management environments. The devices are qualified for the temperature range from -40°C to 150°C and are robust against aggressive media such as iodine or exhaust gas condensates.

The new sensors will be at display at the Sensor + Test trade fair later this month in Nuremberg, Germany.

More information: www.infineon.com/pressure-sensors 

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