Molex RNC-AM Road Noise Cancellation Sensor

Molex Road Noise Cancellation Sensor with Accelerometer and Microphone (RNC-AM) features A2B technology and converts vehicle chassis vibration and airborne noise into a signal. This signal generates a cancellation soundwave, reducing unwanted noise within a vehicle’s cabin. The sensor is connected through daisy-chained cabling, which eliminates the weight of heavy star-pattern or home-run wire harnessing and sound-dampening materials. Network technology minimizes the time between the sensor receiving the vibration excitation and the processing unit receiving the signal, which means the noise is canceled more efficiently. Plus, the sensor can measure road noise at slower speeds and be placed farther away from the sound source while providing more network data channels.

The sensor casings carry an IP6K9K enclosure rating to protect the system from the water and dust of harsh automotive environments. The Molex RNC-AM sensors utilize the space-saving Molex Sealed Mini50 Connector interface. Various mechanical housing configurations
offer flexibility for orienting the sensing element parallel or perpendicular to the ground, which allows multiple connector orientations and terminal sizes. Depending on the need, RNC systems can also be configured with four to eight sensors.

Features

  • Daisy-chained sensors eliminate heavy star-patterned cabling and reduce vehicle harness weight
  • Low system latency delivers superior noise cancellation, the time between the sensor receiving the vibration and the module receiving the signal is extremely short
  • IP6K9K rating ( per ISO 20653) provides protection against water and dust ingress in harsh environments
  • Mates with 1-by-4 sealed Mini50 connectors, providing 50% space savings over traditional USCAR 0.64mm connectors and delivering superior signal integrity performance

Applications

  • In-cabin noise reduction
  • Autonomous vehicles
  • Advanced driver assistance systems (ADAS)

Specifications

  • Microphone
    • 1% total harmonic distortion + noise at 1kHz
    • 133dB acoustic overload point
    • -46dBFS ±2dBFS at 1kHz
    • 29dBSPL noise floor
    • 65dB(A) signal-to-noise
    • 45Hz to >20kHz bandwidth
    • Omnidirectional
  • Accelerometer
    • 16g maximum monitored shock load (in all axes)
    • 200Hz to 500Hz anticipated sensory frequency range
    • 500Hz to 4kHz programmable frequency range
    • 150µ maximum latency at 2kHz bandwidth
    • Low noise
      • <100µ/√Hz for x- and y-axes
      • <150µg/√Hz for z-axes
    • Up to 14Gbps digital output
  • Mechanical
    • Installation force into vehicle position should not exceed 25N
    • Retention force greater than 15N prior to nut-and-screw fastening
    • Retained in place by an M6 screw and nut shall be 10Nm ±2Nm
  • -40°C to +85°C temperature range
  • Harnessing expectations
    • 2x jacketed unshielded twisted pairs for 100Mbps transmission
    • Twisted pair cable type must comply with the SAE-J3117 standard and the Open Alliance Specification for Communication Channel 2.0 = 100BaseT1
    • 100Ω digital matched differential impedance
    • Sensor units are daisy-chained together

Molex RNC-AM Road Noise Cancellation Sensor