Impedance Sensing IC Evaluation Kit
The RAA2S4704 evaluation board provides programming, simulation, and testing functions for the RAA2S4704 multi-channel impedance measurement IC, supporting up to seven...
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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
- Hands off detection (HOD)
- Capacitive sensing and impedance measurement
Documentation
Featured Documentation
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| Datasheet | PDF 545 KB | |
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Design & Development
Software & Tools
Software & Tools
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Software type
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| Renesas IC Toolbox (RICBox) The Renesas IC Toolbox (RICBox) software platform enables customers to configure Renesas devices on evaluation kits when attached to the computer running the software.
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Software Package | Renesas |
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Boards & Kits
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.
Processing table
| VFQFPN | 24 | 4.0 x 4.0 x 0.9 | -40 to 105°C | Get Samples, |
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Videos & Training
RAA2S4704 Multi-Channel Impedance Measurement IC Overview
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.
Video List
News & Blog Posts
| Intuitive Human Machine Interface (HMI) and Enhanced Safety with Hands-Off Detection | Blog Post | Feb 21, 2025 |