Electronic Control Device and Electronic Control System

An electronic control system comprising a first electronic control device including a first data processing circuit and a second electronic control device including a second data processing circuit, the first electronic control device and the second electronic control device performing bidirectional data communication with each other,

• wherein
• the first electronic control device includes:
• a power source terminal that is connected to a first power source;
• a first data terminal to which a first external data line for performing data communication with the second electronic control device and receiving power supplied from the second electronic control device is connected;
• a first internal data line that connects the first data terminal and the first data processing circuit and transfers a data signal from the first data terminal to the first data processing circuit;
• and a first power source selection circuit that has an input side connected to the power source terminal and the first data terminal and an output side connected to the first data processing circuit, selects any one with a higher potential of power to be supplied from the power source terminal and the first data terminal on the input side, and connects the selected one to the first data processing circuit on the output side, and
• the second electronic control device includes:
• a first power source terminal connected to the first power source;
• a second power source terminal connected to a second power source;
• a first data terminal to which the first external data line is connected;
• a first internal data line that connects the first data terminal and the second data processing circuit and transfers a data signal from the first data terminal to the second data processing circuit;
• a first internal power line that connects the first and second power source terminals and the second data processing circuit;
• a second internal power line that connects the first and second power source terminals and the first data terminal;
• and a rectifier circuit that supplies, to the second internal power line, power of any one with a higher potential among the first power source and the second power source.

An electronic control system comprising a first electronic control device including a first data processing circuit and a second electronic control device including a second data processing circuit, the first electronic control device and the second electronic control device performing bidirectional data communication with each other,

• wherein
• the first electronic control device includes:
• a first power source terminal that is connected to a first power source;
• a first data terminal to which a first external data line for performing data communication with the second electronic control device and receiving power supplied from the second electronic control device is connected;
• a first internal data line that connects the first data terminal and the first data processing circuit and transfers a data signal from the first data terminal to the first data processing circuit;
• and a first power source selection circuit that has an input side connected to the first power source terminal and the first data terminal and an output side connected to the first data processing circuit, selects any one with a higher potential of power to be supplied from the first power source terminal and the first data terminal on the input side, and connects the selected one to the first data processing circuit on the output side;
• and
• the second electronic control device includes:
• a second power source terminal connected to a second power source;
• a data terminal to which the first external data line is connected;
• an internal data line that connects the data terminal and the second data processing circuit and transfers a data signal from the data terminal to the second data processing circuit;
• and a second power source selection circuit that has an input side connected to the second power source terminal and the data terminal and an output side connected to the second data processing circuit, selects any one with a higher potential of power to be supplied from the second power source terminal and the data terminal on the input side, and connects the selected one to the second data processing circuit on the output side.