3 System Block Diagram

Figure 3-1 shows a typical DMS/OMS system block diagram based on the AM62A processor.

The CSI2 RX interface provides a single port 4-lane interface with a bandwidth of 1.5 Gbps per lane. This interface can handle the required bandwidth for a 5MP@60fps RGB-IR sensor or multiple sensor inputs through an external FPD-Link hub device. The AM62A processor combines processing cores and peripherals to create the DMS/OMS system while minimizing the Bill of Materials (BOM) for compact board and enclosure spaces like in a rearview mirror system. It incorporates a Cortex-R5F core and peripherals, including a CAN-FD controller, to run an isolated AutoSAR OS for system control, ensuring freedom from interference. Previously, legacy systems relied on an external MCU for this purpose, but the AM62A reduces system size and cost by integrating the MCU island with FFI. There is also support for various flash devices as boot sources, allowing system designers to select flash devices that meet the system cost or boot time requirements. Ensuring precise and safe infrared-based illumination, even in challenging lighting conditions within a car, is crucial for monitoring. The ASIL-B system requirements imply that the system has to be able to detect and control the maximum current and pulse-width within a single IR illumination pulse. Precise synchronization with the sensor is required for this purpose. Multiple PWM signals are necessary for controlling the illumination system and mechanical components in the DMS/OMS system. The AM62A supports over nine PWM output signals, thanks to ePWM, eCAP, and Timer modules, providing ample control signals for advanced DMS/OMS systems. The integrated Ethernet controller supports up to two ports and offers switch and TSN/AVB functionality for traffic scheduling and shaping. If needed, the Display Subsystem, equipped with a video pipeline and overlay features, can display the DMS/OMS system status on a screen via its DPI port. Additionally, Texas Instruments has developed a companion PMIC to support power resources and power supply sequences required by the AM62A. This PMIC includes integrated functional safety features such as a watchdog timer, facilitating the design of an ASIL-B system at the lowest possible cost.