High precision amplification and sensor-specific correction

The RAA2S4252B is a member of the Renesas CMOS integrated circuit family for high-precision amplification and sensor-specific correction of differential bridge sensor signals. The RAA2S4252B features 900 maximum analog preamplification and analog Sensor offset correction (XSOC), which can be adjusted for almost all resistance Bridges.

Conditioning calculations are performed with a 16-bit RISC microcontroller. The calibration coefficients and configuration data are stored in non-volatile memory (NVM) and are reliable in automotive applications. The measured value is provided by the ratio analog output signal. Tail-of-the-line (EOL) calibration is also supported through this output pin via a single-wire interface (OWI). Digital calibration helps reduce assembly costs because no external equipment or laser is needed for trimming.

The RAA2S4252B is optimized for harsh automotive environments with overvoltage and reverse polarity protection circuits, excellent electromagnetic compatibility, and multiple diagnostic features.

Features and Benefits

● Compatible with all resistive pressure sensing technologies
● Extended XSOC
● ±40v overvoltage and reverse polarity protection, powerful EMC performance and superior diagnostic capabilities
● Temperature sensing using PTC/ diode /PTAT/BRTC
● Effective ADC resolution is 13 bits to 18 bits
● In the fastest mode, the output update rate is 100μs; Comparable analog bandwidth in the 5 KHZ region
● Ratio analog output (AOUT) signal
● The AECQ-100 is grade 0 qualified and is offered in both QM and ASIL-B variants
● Highly cost effective solution for sensors calibrated with small BOM and EOL
● Minimum external components required (lower BOM cost)
● Reduce the cost of EOL production in mass production
● Digital compensation for migration, sensitivity, temperature drift and nonlinearity
● Capable of covering large sensor spans while providing high accuracy (1.0%) over the entire temperature range (-40°C to +150°C)
● RAA2S4251 (QM, QFN-24, and bare mode), RAA2S4252 (SOP-08), and RAA2S4253 (ASIL-B, QFN-24, and bare mode) variants

Applications

● ICE and xEV braking and transmission require IC and module level safety
● The ICE and xEV HVAC systems
● Pressure measurement in fuel cell systems
● Differential and single-ended bridge sensor readout