The DDR interface can handle various SDRAM types and has an ECC extension for error detection and correction. Internal memories of the TDA3x are also protected with ECC or parity. Besides hardware BIST (built-in self-test for diagnosis of vital parts of the chip) other nifty safety means have been leveraged from Hercules™ TMS570 safety MCU family. This makes TDA3x well suited for safety-critical driver assistance applications like radar. The TDA3xR is available in two package variants, 15mm x 15mm and 12mm x 12mm, whereas the latter is a so-called POP (package-on-package) variant. With the DDR memory on-top of TDA3x the sensor size can be minimized.
Summary and Outlook
The TDA3xR in combination with one or two AFE5401-Q1 devices enables a scalable implementation of short-range, mid-range and long-range radar sensors with 4 to 8 receive channels while software compatibility is maintained. Moreover, the safety features available in TDA3x and AFE5401-Q1 provide a solid foundation for realization of safety critical applications. Both devices are optimized in terms of low power consumption and are available in small packages allowing to shrink the sensor housing. With the POP variant of the TDA3x PCB layout can be simplified and the number of signal layers may be reduced. The performance headroom of the heterogeneous TDA3x architecture permits for example the integration of the AUTOSAR software stack on one of the Cortex-M4s or implementation of sensor fusion for AEB (autonomous emergency brake) in addition to radar signal processing. TDA3xR and AFE5401-Q1 facilitate radar sensor developers to take the next evolutionary step on the way to supersede the driver’s visual sense needed for autonomous driving.
About the author:
Peter Aberl studied electronic engineering with focus on data processing at the Munich University of Applied Sciences. He started to work as Applications Engineer in the area of Automotive Electronics at Texas Instruments (TI) in 1994. Since 2009 he supports TI’s Driver Assistance System-on-Chip and Hercules Safety MCU products at European Automotive customers. He is Senior Member Technical Staff (SMTS) and Principal Field Application Engineer.