Murata recently announced a new MEMS 6DoF (Six Degrees of Freedom) inertial sensor that realizes high performance for safety-critical automotive applications. The SCHA600 enables new ADAS (Advanced Driver-Assistance Systems) functionality and AD (Automated Driving) through data fusion with GNSS (Global Navigation Satellite System) and various perception sensors such as camera, radar and lidar. The product delivers the best performance available for automotive applications in regard to bias stability and noise. The orthogonality of the measurement axes is calibrated at Murata, allowing system integrators to skip this costly and performance-critical process step.

This new sensor is a single package 6DoF component to be integrated with GNSS and perception sensors for L2+ and higher levels of autonomy. The new sensor enables centimeter-level accuracy in regard to vehicle dynamics and position, enabling safe, robust and verified autonomous driving. Extensive attention has been given to guarantee operation during high mechanical shock and vibration. The product is qualified according to the AEC-Q100 standard, includes several advanced self-diagnostic features and is fully ASIL-D (Automotive Safety Integrity Level) compliant.

Murata has more than 20 years of experience of providing inertial sensors for safety critical automotive applications like ESC. This expertise has been utilized for the development of the SCHA600 sensor. SCHA600 series features extensive failsafe functions and error bits for diagnostics. These include internal reference signal monitoring, checksum techniques for verifying communication, and signal saturation/over range detection. The unique diagnostic feature of Murata's 3-axis accelerometer is the continuously operating self-test function, which monitors the sensor during measurement. This patented self-test function verifies the proper operation of the entire signal chain from MEMS sensor movement to signal conditioning circuitry for every measurement cycle.

Product Features:

  • Single package 6DOF component for safety critical and AD applications
  • ISO26262 compliant for systems up to ASIL D
  • Component-level dynamic cross-axis calibration enables better than 0.3° cross axis error over temperature
  • Allan variance down to 0.9 °/h at room temperature
  • Gyro RMS noise level below 0.007°/s
  • Excellent vibration robustness
  • Extensive self-diagnostics features
  • ±125°/s or ±300°/s angular rate measurement range to cover various application needs
  • ±6 g acceleration measurement range
  • −40°C~+110°C operating temperature range
  • 0V~3.6V supply voltage
  • SOIC housing body size 18.7 mm x 8.5 mm x 4.5 mm (L × W × H), 32 pins
  • Qualified according to the AEC-Q100 standard

The SCHA600 is suitable for any application in automotive requiring 6DOF measurement capability. The factory dynamic calibration will remove the need for cost intensive calibration at ECU level in applications requiring accurate inertial data. The performance has been optimized for usage as primary IMU (Inertial Measurement Unit) for AD, while ESC unit will provide robust redundancy. Integration to GNSS will provide robust & accurate positioning and AD vehicle motion calculation can be improved with reliable, frequently updated inertial data.

Typical applications include:

  • Advanced Driver-Assistance Systems (ADAS)
  • Automated Driving (AD)
  • Inertial Navigation for dead reckoning
  • Lane Keeping Assistant (LKA)
  • Motion and position measurements
  • Platform stabilization

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