Overview
Description
The RAA2S4704 is part of Renesas’ family of mixed-signal sensor ICs, designed for high-performance applications. It derives capacitance and conductance information from measured impedance, allowing for accurate assessments across a wide frequency range. This flexibility enables the measurement of both in-phase and quadrature-phase sensor components, tailored to specific environmental and application conditions.
The device features a configurable measurement scheme that maximizes the measurement rate based on the connected sensor or source. Measurements can be initiated on demand, using a predefined set of configurations. The acquired IQ data is transmitted via an SPI interface.
The RAA2S4704 offers excellent electromagnetic compatibility and a range of diagnostic features, making it ideal for demanding automotive environments. Its sensor inputs are protected against short circuits and designed to withstand overvoltage conditions typical in automotive applications.
Features
- Provides data for impedance calculation, with measurements proportional to the in-phase and quadrature-phase components of impedance across up to seven measurement channels (SIO)
- All seven channels are equivalent; a maximum of three channels can be activated simultaneously
- Adjustable measurement frequency ranges from 50kHz to 150kHz
- Equipped with both internal and external temperature sensors
- Offers up to 16 flexible measurement schemes, including options for SIO input, gain, averaging, and excitation frequency
- Ten scalable measurement ranges, accommodating capacitances up to 3200pF
- High linearity with accuracy up to ±1.5% FS, including temperature compensation (TC)
- Sensitivity of up to 5fF/LSB without averaging
- Supports 3.3V and 5V power supplies, along with a power-saving mode
- Robust input channels capable of withstanding over-voltage up to 18V (max. 1hr lifetime)
- Complies with ISO 26262:2018 ASIL-B requirements for sensor and self-supervision
- Background data acquisition enables self-supervision and sensor diagnostics
- Features an internal RC oscillator with the option for an external clock input
- NVM for IC calibration and traceability data
- Ambient temperature range between -40 °C and 105 °C
- AEC-Q100 qualified QFN24 package
Comparison
Applications
Documentation
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| Type | Title | Date |
| Datasheet | PDF 545 KB | |
| Datasheet - Short-Form | PDF 158 KB | |
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The RAA2S4704 is a mixed-signal sensor IC, designed for high-performance applications. It derives capacitance and conductance information from measured impedance, allowing for accurate assessments across a wide frequency range. It offers excellent electromagnetic compatibility and a range of diagnostic features, making it ideal for demanding automotive environments.
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Blog Post
Feb 21, 2025
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