OBU (On-Board Diagnostics) is an in-vehicle diagnosis system used to monitor whether the exhaust emission-related components are operating normally to prevent poor engine operation.

Nuvoton provides a complete reference design that includes the NuMicro® NUC131 microcontroller and then the N9H30 microprocessor. NUC131 includes a set of CAN Bus that can collect information on the engine, catalytic converter, particle trap, oxygen sensor, emission control system, fuel system, and EGR, etc. N9H30 receives the information collected by NUC131 and displays them on the 7-inch TFT-LCD panel.

Design features:

Supports the following protocols:

• ISO 15765-4 CAN
• SAE J1850 PWM/ VPW
• SAE J1939 CAN
• ISO 9141-2
• ISO 14230-4 KWP

Display interface supports emWin

NuMicro® NUC131 specification features

• 32-bit Arm® Cortex®-M0
• AEC-Q100 vehicle grade certification
• Supports CAN 2.0 A/B (1Mbit/s)
• Supports 6 channels of UART including LIN and RS485
• Supports 24 channels of 100MHz PWM output
• High anti-interference: ESD HBM 8 kV, EFT 4.4 kV
• Supported wide voltage range: 2.5 ~ 5.5V