Features
- 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
Description
The RAA2S4251B 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 RAA2S4251B 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 RAA2S4251B is optimized for harsh automotive environments by over-voltage and reverse polarity protection circuitry, excellent electromagnetic compatibility, and multiple diagnostic features.
Parameters
| Attributes | Value |
|---|---|
| Function | Resistive SSC |
| Automotive Qual. | Yes |
| Supply Voltage (V) | 4.5 - 5.5 |
| Input Type | Single-bridge |
| Interface | I2C, Ratiometric Analog Voltage, ZACwire™ (OWI) |
| Adj. Analog Gain | 3 - 912 |
| Resolution (bits) | 18 |
| Sample Rate Max (KHz) | 10 |
| Temp. Range (°C) | -40 to +150°C, -40 to 150°C |
Application Block Diagrams
 | Dexterous Robotic Hand Modular, high‑precision motor control architecture for scalable dexterous robotic hands. |
Additional 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)
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Renesas Boards & Kits
RAA2S425XKIT Evaluation Kit
The evaluation kit provides an entry point to evaluate RAA2S425X product family.
Support Communities
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Is it prohibited to supply External power directly to the External PCB which is connected to the RAA2S4251 Evaluation Board ?
Dear Renesas Community members: We are currently reviewing and developing the RAA2S4251 chip for use in our 0.5V to 4.5V output, ratio-metric pressure transmitters. Using the Evaluation Board and relevant GUI, we would like to test the calibration capabilities of them to the External PCB containing the ...
Oct 4, 2023 -
What does the AFEDAC value mean and how I choose it in RAA2S4251 configuration process
Dear Renesas Community members: We are, using RAA2S4251 chip, currently developing the 0.5V to 4.5V output, ratio-metric pressure transmitters. Our pressure transmitters include Piezo-resistive full bridge sensor and PCBs. Using the Evaluation Board and relevant GUI, we want to test the calibration capabilities of them to ...
Oct 11, 2023 -
About bridge configuration settings by GUI of RAA2S4251
Dear Renesas Community members: We are, using RAA2S4251 chip, currently developing the 0.5V to 4.5V output, ratio-metric pressure transmitters. Our pressure transmitters include Piezo-resistive Four element varying bridge sensor. We want to first test whether the RAA2S4251 chip can calibrate our bridge sensor well using the ...
Nov 1, 2023
Support Communities
