The document is a user manual for Mercedes-Benz AG CMBTRX1, introduces the features and characteristics of the product, including system functional description, appearance, function flow, etc.
The Mercedes-Benz CMBTRX1 is an integrated UWB and BLE radio device designed for vehicle applications such as digital key access and user positioning. It functions as a bidirectional transceiver with an integrated antenna, connecting to a central control unit via a CAN interface. The system typically involves two modules in the headliner and four in the bumpers, communicating with smartphones or key fobs.
| Functionality | UWB (Ultra Wide Band) and BLE (Bluetooth Low Energy) transceiver module |
|---|---|
| Application Purpose | Car access and user localization purposes |
| Interface | private high-speed CAN communication interface |
| Power Supply | integrated 12/3V power supply |
| BLE Crystal Frequency | 32.0 MHz (±50 ppm) |
| UWB Crystal Frequency | 55.2 MHz (±15 ppm) |
| Main µC Clock Frequency | 16MHz (±100 ppm) |
It serves as a UWB and BLE transceiver for car access and user localization purposes.
The system uses BLE links for data exchange with mobile devices and UWB links for position detection.
The UWB system becomes inactive after a timeout once driving readiness is established and the vehicle moves at a certain speed.