Renesas RAA2S4704
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.
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
