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Pressure sensing solution for automotive applications

Renesas has introduced the RAA2S425x family of ICs for automotive pressure sensing systems.

The devices are able to provide highly accurate amplification and sensor-specific correction of signals in automotive xEV/EV/FCEV pressure sensing braking, transmission and HVAC systems. The product family features high integration and advanced digital and analogue functionality that will significantly ease the design cycle and reduce customers’ system BOM and production costs.

The RAA2S425x ICs support all major pressure sensing technologies and feature a high-performance analogue front-end (AFE) for enhanced signal conditioning. They offer extended analogue sensor offset compensation (XSOC), adjustable to nearly all resistive bridges. They deliver pressure and temperature readings with high accuracy (0.35% - 1.0%) over a wide temperature range (-40°C to 150°C).

The ICs integrate a 16-bit embedded RISC microcontroller that provides digital compensation of offset, sensitivity, temperature drift, and nonlinearity. It has highly reliable non-volatile memory (NVM) to store calibration coefficients and configuration data in harsh automotive environments.

The RAA2S425x communicates digitally with calibration equipment, reducing noise sensitivity. Digital calibration enables customers to keep assembly costs low since it doesn’t require trimming of sensing element.

The RAA2S425x is intended for safety and harsh automotive applications and provides integration of overvoltage and reverse-polarity protection circuitry, ASIL-B compliance according to ISO26262, electromagnetic compatibility, and multiple diagnostic features.

Author
Neil Tyler

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