Two-Wire Bus SPI Node Transceiver for Vehicle Communication
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Solution Overview
Problem
Conventional communication systems in vehicles face challenges with thick and heavy cable bundles due to the increasing number of electronic components, which require efficient communication infrastructure to manage signal exchange between components without significant latency or power consumption.
Innovation Solution
A two-wire communication system with serial peripheral interface (SPI) functionality, where a node transceiver includes SPI circuitry and upstream/downstream transceiver circuitry, allowing SPI commands to be executed or transmitted along a two-wire bus for execution by other nodes or slave devices, enabling efficient data transmission and power distribution through a daisy-chain configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If more electronic components are included in vehicles to meet increasing performance expectations, then functional capability is improved, but communication infrastructure complexity and weight increase due to thick cable bundles
Solution Approach 1:
The patent combines multiple communication functions (SPI commands, upstream data, downstream data, power distribution) into a single two-wire bus infrastructure. This merging eliminates the need for separate cable bundles for each function, directly reducing the weight and complexity of the communication infrastructure while supporting increasing functional capability through the unified bus system.
Solution Approach 2:
The two-wire bus is designed to perform multiple functions simultaneously: transmitting SPI commands from master to slave nodes, carrying upstream data from slaves to master, delivering downstream data from master to slaves, and providing power distribution. This multi-functionality allows the system to support more electronic components without proportionally increasing infrastructure weight.
2Adaptability or versatility
If traditional multi-cable communication systems are used to connect increasing numbers of components, then connectivity is improved, but latency and power consumption increase
Solution Approach 1:
By merging command transmission, upstream data, and downstream data into a single two-wire bus with time-division multiplexing, the system eliminates the latency associated with switching between multiple separate cables and protocols. The unified bus allows seamless transition between different data directions without the overhead of separate physical connections.
Solution Approach 2:
The system uses a daisy-chain configuration where slave nodes are pre-configured with their positions in the chain. This preliminary arrangement allows data to be forwarded efficiently through intermediate nodes without requiring complex routing decisions or additional latency for path determination, as the data flow path is established in advance through the fixed daisy-chain topology.
3Reliability
If separate ground and voltage sources are provided for each communication line, then signal integrity is improved, but device complexity and cable requirements increase
Solution Approach 1:
The patent merges power distribution with data transmission by incorporating power delivery capability into the same two-wire bus used for SPI commands and data. This eliminates the need for separate ground and voltage source connections for each communication line, reducing infrastructure complexity while maintaining signal integrity through proper power management at each node.
Solution Approach 2:
The two-wire bus is designed as a universal infrastructure that simultaneously handles signaling, data transmission, and power distribution. This multi-functionality reduces the number of required connections from multiple separate lines (each requiring their own ground and voltage sources) to just two wires, simplifying the overall system architecture.
4Device complexity
If daisy-chain configuration is used for two-wire bus, then infrastructure simplification is achieved, but data transmission distance and node coordination challenges increase
Solution Approach 1:
The daisy-chain configuration naturally segments the network into discrete node positions, with each slave node clearly defined by its position in the chain. This segmentation allows for manageable transmission distances between adjacent nodes while maintaining overall system simplicity. Each node only needs to communicate with its immediate neighbors, reducing the complexity of long-distance signal management.
Data Source
AI summary
Disclosed herein are systems and techniques for serial peripheral interface (SPI) functionality for node transceivers in a two-wire communication bus. For example, in some embodiments, a node transceiver may include SPI circuitry and upstream or downstream transceiver circuitry. SPI commands received via the SPI circuitry may be executed by the node transceiver, or transmitted upstream or downstream along the two-wire bus for execution by another node transceiver or a slave device coupled to another node transceiver.