SENT Protocol Readback Error Detection Mechanism
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Solution Overview
Problem
Low-cost single wire interfaces, such as the Single Edge Nibble Transmission (SENT) protocol, have limited diagnostic capabilities and are susceptible to errors due to electrostatic discharge (ESD) and electromagnetic interference (EMI), which can lead to system failures in automotive electronics.
Innovation Solution
A method for enhanced diagnostic coverage in single wire interfaces, specifically in simplex mode, is achieved by implementing a readback mechanism where the transmitted data is compared to the intended data, allowing for error detection and flagging mismatches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If SENT protocol is used for low-cost single wire interface, then system cost is reduced, but diagnostic capability is limited
Solution Approach 1:
The transmitting device performs a readback of the transmitted data and compares it with the original data before the receiver even processes the data. This preliminary error detection mechanism is built into the transmission process itself, allowing error detection without adding complex diagnostic infrastructure at the receiver side, thus maintaining low cost while improving diagnostic capability.
Solution Approach 2:
The patent implements a feedback mechanism where the transmitting device monitors its own transmitted data by reading back the data from the communication line and comparing it with the original data. This self-diagnostic feedback loop enables the system to detect transmission errors, ESD events, and EMI without requiring additional diagnostic hardware, resolving the contradiction between low cost and diagnostic capability.
2Device complexity
If SENT protocol is used for single wire interface, then device complexity is reduced, but susceptibility to ESD and EMI increases
Solution Approach 1:
The transmitting device performs self-diagnosis by reading back its own transmitted data and comparing it with the original data. This self-service error detection mechanism allows the system to identify ESD and EMI events without requiring the receiver to implement complex protection or detection circuitry, thus maintaining low device complexity while reducing susceptibility to harmful factors.
Solution Approach 2:
The error detection is performed preliminarily at the transmitting device before the data is fully processed by the receiver. By detecting errors early in the transmission process and flagging them at the source, the system prevents corrupted data from propagating through the system, reducing the impact of ESD and EMI without adding complexity to the receiver side.
3Reliability
If readback mechanism is implemented for error detection, then diagnostic coverage is improved, but device complexity increases
Solution Approach 1:
The transmitting device uses its existing components (transmitter, receiver, and comparator) to perform self-diagnosis. The same hardware that transmits data is used to read back and compare the data, eliminating the need for separate dedicated error detection hardware. This self-service approach improves diagnostic coverage while minimizing increases in device complexity.
Solution Approach 2:
The patent makes the transmitting device's hardware components serve multiple functions: the transmitter sends data, the same transmitter reads back the transmitted data, and the comparator both encodes data and compares it with the readback data. This multi-functionality allows comprehensive error detection without proportionally increasing device complexity, as existing components are utilized more intensively rather than adding new dedicated components.
Data Source
AI summary
A technique for providing error detection during simplex serial data transmission, as well as associated methods and systems, are disclosed. The technique is based on a readback of the serially transmitted data on the external single wire bus. The readback data is internally processed and compared to the intended transmission data. An error is flagged where the intended and the actual data are not the same. One advantage of this technique is that it can be wrapped around an existing SENT hardware, thereby improving diagnostic coverage while not affecting the SENT protocol implementation itself.