Renesas Electronics RAA2S425x Automotive Sensor Signal Conditioners

Renesas Electronics RAA2S425x Automotive Sensor Signal Conditioners are optimized for use in automotive pressure sensing systems. The RAA2S425x devices provide highly accurate amplification and sensor-specific correction of signals in automotive xEV, EV, and FCEV pressure-sensing braking, transmission, and HVAC systems. The RAA2S425x ICs feature high integration and advanced digital and analog functionality that significantly ease the design cycle and reduce system BOM and production costs.

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

The RAA2S425x ICs integrate a 16-bit embedded RISC microcontroller that provides digital compensation of offset, sensitivity, temperature drift, and non-linearity. These devices have highly reliable non-volatile memory (NVM) to store calibration coefficients and configuration data in harsh automotive environments. The RAA2S425x devices communicate digitally with calibration equipment, reducing noise sensitivity. Digital calibration enables customers to keep assembly costs low since it doesn’t require trimming sensing elements. The RAA2S425x series 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.

Renesas Electronics RAA2S425x Automotive Sensor Signal Conditioners are offered in three variants

RAA2S4251 Sensor Signal Conditioner with Analog Output in a 4.0mm x 4.0mm QFN-24 package
RAA2S4252 Sensor Signal Conditioner with Analog Output in a 4.9mmx 3.9mm SOIC-08 package
RAA2S4252 Sensor Signal Conditioner with Analog Output (ASIL-B according to ISO26262) in a 4.0mm x 4.0mm QFN-24 package

All three variants are AEC-Q100 Grade 0 qualified for use in automotive applications.

Features

AEC-Q100 Grade 0 (-40°C to +150°C) qualified
High-performance analog front end (AFE) for enhanced signal conditioning
High accuracy pressure readings of 0.35% to 1.0%
Effective ADC resolution of 13 to 18 bits
Automotive ASIL-B compliance according to ISO26262 (RAA2S4253)
Extended analog sensor offset compensation (XSOC) enables support for multiple resistive bridges with selectable on-chip PTAT (proportional to the absolute temperature) support to deliver external temperature sensing
Digital compensation of offset, sensitivity, temperature drift, and non-linearity for increased accuracy
Digital calibration reduces assembly costs by eliminating the need to trim sensing elements

Calibration and configuration data stored in highly-reliable non-volatile memory
Ratio-metric analog output signal and output update rate of 100μs in the fastest mode
Diagnostics and fault checks for fault-safe operation
Static and temporary diagnostic modes are available
Optimized for harsh automotive environments
Over-voltage and reverse polarity protection ±40V, robust EMC performance, and multiple diagnostic features
Package options
- 4.0mm x 4.0mm QFN-24 package with wettable flanks (RAA2S4251, RAA2S4251)
- 4.9mmx 3.9mm SOIC-08 package with wettable flanks (RAA2S4252)

Applications

xEV, EV, and FCEV braking and transmission systems requiring safety both at IC and module level
xEV, EV, and FCEV HVAC systems

Pressure measurement in Fuel Cell systems
Differential and single-ended bridge sensor readouts

Datasheets

RAA2S4251B
RAA2S4252B
RAA2S4253B

Renesas Electronics RAA2S425x Automotive Sensor Signal Conditioners

Features

Applications

Datasheets

Block Diagram

Typical Application Circuit

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