IN Brief:
- BMW will deploy NXP’s NCJ29D6 family in selected vehicle programmes beginning in 2026.
- The device combines secure UWB fine-ranging and short-range radar on one automotive chip.
- Potential applications include digital access, occupant detection, kick sensing, and intrusion alerts.
NXP Semiconductors will supply BMW with an automotive ultra-wideband platform that combines secure fine-ranging and short-range radar, allowing one radio architecture to support digital access and cabin-presence detection.
The Trimension NCJ29D6 family will enter selected BMW vehicle programmes beginning in 2026. NXP describes it as a monolithic automotive UWB solution that integrates both functions on one chip, reducing the need to treat secure access and short-range sensing as separate electronic subsystems.
BMW already uses UWB in Digital Key Plus, which allows an authorised smartphone or smartwatch to replace a conventional key fob. Fine-ranging measures the device’s position relative to the vehicle, enabling hands-free locking and unlocking while making simple relay attacks more difficult than systems that rely only on received signal strength.
The NCJ29D6 extends that radio infrastructure into the cabin. Its radar mode detects subtle motion patterns consistent with a person or animal remaining inside a parked vehicle, after which the system can issue a warning. NXP is positioning the function against emerging regulatory requirements and future new-car assessment protocols in Europe and China.
Combining the functions changes the economics of UWB deployment. Once antennas, secure processing, vehicle networking, and qualified radio hardware are installed for digital access, additional sensing functions can use much of the same system architecture. Access control and occupant detection still have different signal-processing, safety, and validation requirements, but they no longer need wholly separate hardware chains.
Vehicle integration will depend on antenna placement, cabin geometry, interference management, software calibration, and each model’s safety case. Detecting breathing or small body movements is a different problem from locating a phone outside the vehicle, particularly when seats, luggage, reflections, passengers, and environmental conditions vary.
A common UWB family also gives BMW scope to add functions through later platform development. NXP has identified kick sensing, intrusion alerts, and automated charging as potential applications. Each would require its own sensing configuration and vehicle-level validation, but the radio hardware would not be installed for one convenience feature alone.
Recent UWB development has also focused on maintaining accurate ranging in less favourable radio conditions. Research combining narrowband discovery with UWB positioning illustrates how the technology is being extended across automotive, industrial, robotics, and smart-building systems.
Short-range radar also changes the software burden. Presence classification must distinguish a sleeping child or animal from loose objects, reflections, and motion outside the vehicle, while avoiding false alerts that train users to ignore the system. That requires representative cabin datasets, model-specific calibration, and validation across temperature, trim, and seating configurations.
Hardware consolidation is useful only when it does not create a common point of failure. Secure key storage, authenticated ranging, radar processing, over-the-air update controls, diagnostics, and degraded operating modes all have to be considered at system level. A fault affecting convenience access cannot be allowed to suppress a safety-related warning, while cybersecurity controls must prevent the sensing channel becoming another route into the vehicle network.
NXP has not disclosed the number of NCJ29D6 devices expected per vehicle, the production volumes covered by the BMW selection, or the models involved. BMW has also not detailed how presence-detection alerts will be presented or connected to other cabin systems.
Vehicle-level responsibility remains with BMW rather than the radio alone. Presence detection has to be integrated with body control, user messaging, power management, and diagnostic systems, while the access function must operate across different phone models and radio conditions. The semiconductor reduces component duplication, but it does not remove the software and validation work surrounding each function.
The 2026 deployment moves UWB beyond a narrowly defined digital-key component. By combining secure ranging and radar in one automotive-qualified device, NXP is offering a platform whose value will depend on the number of validated functions it can carry without multiplying system complexity.