Analysis of NXP S32R274 automotive radar MCU development plan

Nxp's S32R274 is an MCU for automotive and industrial radar based on 32-bit Power Architecture. The security core uses the e200Z4 32-bit CPU, the compute core uses the e200Z7 32-bit CPU, and integrates 2MB of code flash (FMC flash) with ECC and ECC's 1.5MB SRAM, radar interface includes MIPI-CSI2 (4 data link), ΣΔ-ADC (4x 12-bit 10 MSps) and DAC (10 MSps), other interfaces include Zipwire, 2x SAR-ADC, 2x SPI, 2x I2C , 3x FlexCAN (incl. 2x CAN-FD), FlexrayTM, LINFlexD and Ethernet, operating temperature -40 to 150 ̊ CAEC-Q100 Grade 1. This article describes the main features of S32R274, block diagram and series product performance comparison table, and evaluation Board S32R274EVB motherboard and daughter board main features and circuit diagram.

The S32R27 is a 32-bit Power Architecture based microcontroller for automoTIve and industrial radar applicaTIons. It offers >4x leap in performance per power vs the previous MPC577X products, and increases the level of integraTIon available to designers of next generaTIon automotive radar modules. Designed It meets the high performance computation times required by modern beam-forming fast chirp modulation radar systems by offering unique signal processing acceleration together with powerful multi -core architecture.

Main features of S32R274:

• On-chip modules available within the device include the following features:
• Safety core: Power Architecture? e200Z4 32-bit CPUwith checker core
• Dual issue computation cores: Power Architecture® e200Z7 32-bit CPU
• 2 MB on-chip code flash (FMC flash) with ECC
• 1.5 MB on-chip SRAM with ECC
• RADAR processing
– Signal Processing Toolbox (SPT) for RADAR signalprocessing acceleration
– Cross Timing Engine (CTE) for precise timing generation and triggering
– Waveform generation module (WGM) for chirpramp generation
– 4x 12-bit ΣΔ-ADC with 10 MSps
– One DAC with 10 MSps
– MIPICSI2 interface to connect external ADCs
• Memory Protection
– Each core memory protection unit provides 24entries
– Data and instruction bus system memory protectionunit (SMPU) with 16 region descriptors each
– Register protection
• Clock Generation
– 40 MHz external crystal (XOSC)
– 16 MHz Internal oscillator (IRCOSC)
– Dual system PLL with one frequency modulated phase-locked loop (FMPLL)
– Low-jitter PLL to ΣΔ-ADC and DAC clockgeneration
• Functional Safety
– enables up to ASIL-D applications
– FCCU for fault collection and fault handling
– MEMU for memory error management
– Safe eDMA controller
– Self-Test Control Unit (STCU2)
– Error Injection Module (EIM)
– On-chip voltage monitoring
– Clock Monitor Unit (CMU)
• Security
– Cryptographic Security Engine (CSE2)
– Supports censorship and life-cycle management
• Timers
– Two Periodic Interval Timers (PIT) with 32-bitcounter resolution
– Three System Timer Module (STM)
– Three Software Watchdog Timers (SWT)
– Two eTimer modules with 6 channels each
– One FlexPWM module for 12 PWM signals
• Communication Interfaces
– Two Serial Peripheral interface (SPI) modules
– One LINFlexD module
– Two inter-IC communication interface (I2C) modules
– One dual-channel FlexRay module with 128message buffers
– Three FlexCAN modules with configurable buffers -CAN FD obviously supported on 2 FlexCANmodules
– One ENET MAC supporting MII/RMII/RGMIIinterface
– ZipWire high-speed serial communication
• Debug Functionality
– 4-pin JTAG interface and Nexus/Aurora interfacefor serial high-speed tracing
– e200Z7 core and e200Z4 core: Nexus developmentinterface (NDI) per IEEE-ISTO 5001-2012 Class 3+
• Two analog-to-digital converters (SAR ADC)
– Each ADC supports up to 16 input channels
– Cross Trigger Unit (CTU)
• On-chip voltage DC/DC regulator for core clock (VREG)
• Two Temperature Sensors (TSENS)
The following table provides a comparison of two devices S32R274 and MPC5775K .
This information is intended to provide an understanding of the range of functionality offered by this family. For full details of all of the family derivatives please contact your marketing representative.

S32R274 series product comparison table:

Figure 1. Block diagram of S32R274

Evaluation Board S32R274EVB

The S32R274EVB evaluation board (EVB) is an evaluation tool for the S32R274 Radar MCU to enable hardware and software development.

For LVB has been designed as a modular development platform. The EVB main board does not contain an MCU. Instead, the MCU is fitted to an MCU daughter card (occasionally referred to as an adapter board). This approach Means that the same EVB platform can be used for multiple packages and MCU derivatives within the MPC57xx and further families. High transparency connectors provide the interface between the EVB and MCU daughter cards as shown in the diagram below.

Both variants allow you to start with the software development, and to experience the highly integrated Radar Signal Processing Toolbox (SPT) along with state of the art functional safety and hardware security features (CSE2).

Figure 2. Outline drawing of the evaluation board S32R274EVB

The evaluation board S32R274EVB includes motherboards and daughter boards with different characteristics.

Main features of the motherboard:

• Support provided for different MCUs by utilising MCU daughter cards
• Single 12V external power supply input with four on-board regulators providing all of the necessary EVB and MCU voltages; Power supplied to the EVB via a 2.1mm barrel style power jack or a 2-way level connector; 12V operation allows in-car Use if desired
• Master power switch and regulator status LEDs
• Two 240-way high-density daughter card expansion connectors connecting the the MCU daughter card or a custom board for additional application specific circuitry
• All MCU signals readily accessible at a port-ordered group of 0.1” pitch headers
• RS232/SCI physical interface and standard DB9 female connector
• FlexRAY interface
• LINFlexD interface
• 2 CAN interfaces, one configurable to be connected to one out of two CAN modules, and one connected to a dedicated third CAN module
• Ethernet interface
• Variable resistor, driving between 5V and ground
• 4 user switches and 4 user LEDs, freely connectable
• Liberal scattering of GND test points (surface mount loops) placed throughout the EVB

Main features of the daughter board:

• MCU (soldered or through a socket)
• Flexible MCU clocking options allow provision of an external clock via SMA connector or 40MHz EVB clock oscillator circuit. Solder pads on the daughter card allow selection between these external clocks. SMA connectors (including differential clock input) on CLKIN signal for easy access.
• User reset switch with reset status LED
• Standard 14-pin JTAG debug connector and 34-pin Nexus Aurora connector
• 10-pin Serial Interprocessor Interface (SIPI) connector
• Gb Ethernet Physical interface IC, with RJ45 connector
• MIPI-CSI2 connector intended for use with Eagle MR3003 RADAR front end EVK (Evaluation Kit)
• Liberal scattering of ground and test points (surface mount loops) placed throughout the EVB

Figure 3. Evaluation board S32R274EVB circuit diagram (1)

Figure 4. Evaluation board S32R274EVB circuit diagram (2)

Figure 5. Evaluation board S32R274EVB circuit diagram (3)

Figure 6. Evaluation board S32R274EVB circuit diagram (4)

Figure 7. Evaluation board S32R274EVB circuit diagram (5)

Figure 8. Evaluation board S32R274EVB circuit diagram (6)

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