Accurate Pressure Sensing Solution For Automotive Applications

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It integrates multiple analogue and digital functions to reduce design time and costs of braking, transmission and HVAC systems

With the introduction of the RAA2S425x IC Family, Renesas Electronics provides highly accurate amplification and sensor-specific signal correction in automotive xEV/EV/FCEV pressure sensing braking, transmission and HVAC systems. The RAA2S425x IC Family features high integration, and advanced digital and analogue functionality for eased design cycle, and reduced system BOM and production costs.

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

The RAA2S425x ICs integrate a 16-bit embedded RISC microcontroller that provides digital compensation of offset, sensitivity, temperature drift and nonlinearity for increased accuracy. Its highly reliable non-volatile memory (NVM) can 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 a reduction of sensing elements. 

RAA2S425x is an optimal solution for safety and harsh automotive applications with integration of overvoltage and reverse-polarity protection circuitry, ASIL-B compliance according to ISO26262, excellent electromagnetic compatibility and multiple superior diagnostic features.

Other Features 

• Effective ADC resolution of 13 to 18 bits
• AEC-Q100 Grade 0 (-40°C to 150°C) qualified
• Ratio-metric analogue output signal and output update rate of 100μs in the fastest mode
• Static and temporary diagnostic modes available

Renesas has combined the RAA2S425x with complementary MCU, analogue and power offerings to create Winning Combinations for automotive xEV/EV/FCEV pressure sensing braking, transmission and HVAC systems. 

The RAA2S425x devices are available today in 4mm x 4mm QFN-24 packages with wettable flanks.