Fuse Adapter Circuit for Independent CAN Addressing on Dual CMUs
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Solution Overview
Problem
In conventional energy storage systems, the 0.5C project requires two CMU boards, but the existing methods cannot independently address the MCU1s using GPIO pin levels, as they all have high levels when powered on.
Innovation Solution
A circuit, method, and device are introduced that utilize a fuse adapter board with a short-circuited circuit to control the GPIO pin levels of the MCUs, allowing independent addressing by setting CAN addressing based on the levels of these pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If two CMU boards are used for the 0.5C project, then the system capacity is improved, but the ability to independently address MCUs using GPIO pin levels deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring different resistance values in the pull-down resistors connected to each MCU's GPIO pin before the system operates. This allows each MCU to have a predetermined unique identifier (high or low level) that enables independent addressing from the start, eliminating the need for complex runtime configuration while maintaining the ability to address multiple MCUs in the 0.5C project
Solution Approach 2:
The patent applies local quality by assigning different electrical characteristics (different resistance values) to specific local components (pull-down resistors) connected to each MCU. This creates unique identification levels for each MCU locally, allowing them to be distinguished and addressed independently even though they are part of the same system with multiple CMU boards
2Ease of operation
If pull-down resistors are added for each MCU, then independent addressing is enabled, but the device complexity increases
Solution Approach 1:
The patent applies universality by using the same type of component (pull-down resistor) for multiple different purposes: both for establishing unique GPIO pin levels for addressing and for maintaining consistent BOM across different project configurations (0.25C and 0.5C). This multi-functional use of a single component type adds addressing capability without proportionally increasing device complexity
Data Source
AI summary
A circuit, method and device for addressing CAN nodes are provided. The circuit includes: a fuse adapter board including a short-circuited circuit; a first CMU including a first MCU and a first CAN identification circuit; and a second CMU including a second MCU and a second CAN identification circuit. The fuse adapter board is connected to the first MCU or the second MCU through the short-circuited circuit, and is configured to control the short-circuited circuit to be shorted to enable a level on a GPIO pin of the first MCU or the second MCU connected to the short-circuited circuit to be a low level, so that the first MCU and the second MCU set their respective CAN addressing based on the respective levels of the respective GPIO pins.