Creating Protection for LIN Expansion Bus
Local Interconnect Network (LIN) was developed to address the need for cost-effective networks to create communication between the devices where speed is not a critical requirement. LIN is a broadcasting, single wire, serial network protocol that supports communications up to 19.2Kbit/s at a bus length of 40 meters. LIN bus is typically a multi-point, low-cost communication line used for expansion within the peripheral devices in conjunction with the CAN bus in an automotive system.
LIN is a serial communication based, leader-follower network where a leader sends a header signal to up to 15 follower nodes which triggers the follower nodes to send a signal back to leader. This is referred to as a LIN cluster. LIN clusters can communicate with each other when connected via a CAN bus.
LIN Application DiagramThe LIN ESD diode is connected between the Ground and LIN bus, which in turn is pulled up to VBAT as the previous image illustrates.
Design Considerations
- 24-V working voltage (VRWM), high enough to account for a jump start condition and short-to-battery condition for a 12-V battery system.
- Requires a bidirectional diode to avoid any damage because of miswiring of the battery causing a negative DC voltage on the bus or line faults.
- Line capacitance low enough to provide the signal integrity of the LIN signal.
- Clamping voltage lower than the absolute maximum rating of the LIN pin (±60 V) of the transceiver.
- Low leakage allowing the diodes to conserve power when working below the VRWM
| CAN Device | Number of Channels | VRWM (V) | IEC61000-4-2 Contact (kV) | Line Capacitance (pF) |
Clamping Voltage (V) | Package Size (mm) |
|---|---|---|---|---|---|---|
| ESD1LIN24-Q1 | 1 | 24 | 30 | 3 | 37 | SOD323 (2.50 x 1.20) |
| ESD751-Q1 | 1 | 24 | 22 | 1.6 | 36.5 | SOD523 (1.60 x 0.80) |
| ESD761-Q1 | 1 | 24 | 15 | 1.1 | 36.3 | X1SON (1.00 x 0.60) |
For more devices, browse through the online parametric tool where you can sort by desired voltage, channel numbers, on-state resistance, and other features.
Target Applications and End Equipment
- Automotive head unit
- Seat comfort module
- Telematics control unit
- Medium and short range radar
- Body control module (BCM) and Zonal module
Learn More
- Texas Instruments, System-Level ESD Protection Guide Selection Guide
- Texas Instruments, Protecting Automotive CAN Bus Systems from ESD Overvoltage Events Application Note
- Texas Instruments, ESD fundamentals, part 4: ESD capacitance Technical Article
- Need additional assistance? Ask our engineer a question on TI E2E™ ESD and TVS Protection Devices: Key Collateral and FAQs ESD FAQs/Collateral
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