Dr.Auto OBD Diagnostic Unit pin-out schematic | CONFIG.json | SVG
Dr.Auto OBD Diagnostic Unit - pin-out Wires terminate at named pins (sourcePin -> targetPin) obd_tx obd_rx stn_can_tx stn_can_rx can_standby_control power power power power 12V2A_filtered?? No, this represents power from the protection diode to the buck converter input pin VIN. Let's map it correctly based on the node pins available. TVS Cathode receives supply, Anode goes to Ground, TVS is usually in parallel across VIN to protect it. Let's wire CATHODE to automotive_buck_regulator.VIN and ANODE to automotive_buck_regulator.GND as is standard for protection. Wait, standard is TVS is placed in parallel, so we need to bridge tvs_diode_protection.CATHODE to VIN. 12V 5V 5V 5V 5V 3.8V 3.8V 3.3V_logic_level_shifter_assumed?? No, the connection listed SPI0_MOSI to USB_RX and USB_TX to SPI0_MISO but protocol was uart. This was a mismatch where SPI pins were being used for UART. Let's fix them to map to actual UART pins on the SOM if possible, or add TXD1/RXD1 to the edge SOM, or we can use the main UART if it is not shared, but it is already used for OBD transceiver. STN1110 requires UART. Let's add UART1 RX/TX pins to the Edge compute module to handle the LTE module. Alternatively, we map to actual USB lines if they have them, but LTE module shows USB_TX and USB_RX. Let's add TXD1 and RXD1 to edge_compute_som. 3.3V_assumed_or_defined_by_protocol_uart_link?? Protocol is uart. Edge Compute Module mcu · Raspberry Pi Compute Module GPIO12/TXD0 SPI0_CE0_N GND SDA1 SPI0_MOSI SPI0_SCLK RXD1 GPIO13/RXD0 5V TXD1 SCL1 SPI0_MISO 3.3V Automotive CAN Transceiver module · MCP2562-E/SN TXD VDD VSS CANL RXD STBY CANH VIO Cellular and GPS Module module · Quectel EG25-G Mini PCIe VCC USB_RX GPS_ANT SIM_DET GND USB_TX LTE_ANT Multi-Protocol OBD Interface IC module · STN1110 OBD-to-UART Interpre TX CAN_TX VDD ISO_K RX CAN_RX VSS ISO_L Power Distribution Block module · Power Distribution Block V5_IN V5_OUT2 V3_8_IN V12_IN GND V5_OUT1 V5_OUT3 V3_8_OUT V12_OUT Transient Voltage Suppressor power · Littelfuse TPSMC30A CATHODE ANODE Vehicle Power Regulator power · Texas Instruments LM25011-Q1 VIN VCC FB SS SW GND RON EP