LIN Bus Timing Calculator
Calculate LIN bus bit time, break field length, frame time, and maximum frame rate for automotive LIN network design.
Formula
T_{bit} = \frac{1}{baud\_rate},\quad T_{frame} = (13+1+10+10+10N+10) \cdot T_{bit}
Reference: LIN Specification Package Revision 2.2A
How It Works
The LIN (Local Interconnect Network) bus is a serial communication protocol designed for automotive networks, providing a low-cost, simple alternative to CAN bus for less critical communication. The LIN frame structure consists of specific timing components that define how data is transmitted between nodes, with precise bit timing critical for reliable communication.
Worked Example
Problem: Calculate the frame transmission time for a LIN message with 2 data bytes at 9.6 kbps Solution: 1. Bit time (Tbit) = 1 / 9600 = 0.104 ms 2. Break field: ≥13 bits = 13 × 0.104 ms = 1.352 ms 3. Delimiter: 1 bit = 0.104 ms 4. Sync field: 10 bits = 1.04 ms 5. Identifier: 10 bits = 1.04 ms 6. Data (2 bytes): 16 bits = 1.664 ms 7. Checksum: 10 bits = 1.04 ms Total frame time: ≈ 6.236 ms
Practical Tips
- ✓Always verify the exact baud rate of your LIN network
- ✓Consider temperature and electrical noise when designing LIN interfaces
- ✓Use standard LIN slave timing windows to ensure reliable communication
Common Mistakes
- ✗Incorrectly calculating bit time for different baud rates
- ✗Neglecting the variable length of data field
- ✗Misunderstanding the mandatory frame components
Frequently Asked Questions
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