Automotive Sensor Signal Conditioner with Analog Output (ASIL-B according to ISO26262)
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Overview
Description
The RAA2S4253B is a member of Renesas’ family of CMOS integrated circuits for highly accurate amplification and sensor-specific correction of differential bridge sensor signals. Featuring a maximum analog pre-amplification of 900 with analog sensor offset correction (XSOC), the RAA2S4253B is adjustable to nearly all resistive bridges.
Conditioning calculation is accomplished via a 16-bit RISC microcontroller. Calibration coefficients and configuration data are stored in the nonvolatile memory (NVM), which is reliable in automotive applications.
Measured values are provided via a ratio-metric analog output signal. End-of-line calibration is also supported through this output pin via a One-Wire Interface (OWI). Digital calibration helps keep assembly cost low as no trimming by external devices or lasers is needed. The RAA2S4253B is optimized for harsh automotive environments by over-voltage and reverse polarity protection circuitry, excellent electromagnetic compatibility, and multiple diagnostic features.
Features
- Product developed in compliance with ISO26262:2018 ASIL B
- Capable of measuring one full resistive bridge sensor signals
- Temperature measurement using external diode/PTC/TCR or internal (PTAT) sensor
- Large sensor offset correction using analog offset compensation and digital zooming with up to 18-bit resolution
- Higher digital resolution, fast OUR output update rate by ADC & sharp roll-off by digital LPF
- Ability to cover large sensor span & high accuracy (0.35% - 1.0%) over the entire temp. range (-40°C to 150°C)
- Qualified according to AEC-Q100 Grade 0
- Optimized for harsh automotive environment
- Over-voltage and reverse polarity protection ±40V, robust EMC performance, and multiple diagnostic features
- Minimal EOL (end-of-line) production costs during mass production
- QFN-24 as package option
- Analog output
Applications
Applications
- Pressure sensing in braking, transmission and HVAC applications
- xEV
- Plug-in hybrid electric vehicle (PHEV)
- Battery electric vehicle (BEV)
- Fuel-cell electric vehicle (FCEV)
Design & Development
Boards & Kits
Boards & Kits
RAA2S425XKIT Evaluation Kit
The evaluation kit provides an entry point to evaluate RAA2S425X product family.
Featured Documents:
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.
Product Options
Processing table
| 4x4mm 24-QFN | -40 to 150°C | Get Samples, | |
| Die on Tray, Waffle pack | -40 to 150°C | Get Samples, | |
| Wafer Unsawn | -40 to 150°C | ||
| Die on Frame | -40 to 150°C |
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Companion Products
play_circle_filledVideos & Training
High Performance, Highly Accurate Pressure Sensing Solution for Automotive
An overview of the RAA2S425x Family of ICs for automotive pressure sensing systems. Renesas’ SSCs provide highly accurate amplification and sensor-specific correction of signals in automotive xEV/PHEV/FCEV and BEV pressure sensing braking, transmission and HVAC systems.
Video List
News & Blog Posts
| A Paradigm Shift in Automotive Pressure Sensing | Blog Post | Sep 25, 2022 |
