17. LIN / UART - Local Interconnect Network Controller or UART
The LIN (Local Interconnect Network) is a serial communications protocol which efficiently supports the control of
mechatronics nodes in distributed automotive applications. The main properties of the LIN bus are:
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Single master with multiple slaves concept
Low cost silicon implementation based on common UART/SCI interface
Self synchronization in slave node
Deterministic signal transmission with signal propagation time computable in advance
Low cost single-wire implementation
Speed up to 20Kbit/s.
LIN provides a cost efficient bus communication where the bandwidth and versatility of CAN are not required. The
specification of the line driver/receiver needs to match the ISO9141 NRZ-standard.
If LIN is not required, the controller alternatively can be programmed as universal asynchronous serial receiver and
transmitter (UART).
17.1 LIN Features
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Hardware implementation of LIN 2.1 (LIN 1.3 compatibility)
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Small, CPU efficient and independent master/slave routines based on “LIN Work Flow Concept” of LIN 2.1
specification
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Automatic LIN header handling and filtering of irrelevant LIN frames
Automatic LIN response handling
Extended LIN error detection and signaling
Hardware frame time-out detection
“Break-in-data” support capability
Automatic re-synchronization to ensure proper frame integrity
Fully flexible extended frames support capabilities
17.2 UART Features
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Full duplex operation (independent serial receive and transmit processes)
Asynchronous operation
High resolution baud rate generator
Hardware support of 8 data bits, odd/even/no parity bit, 1 stop bit frames
Data over-run and framing error detection
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ATmega16/32/64/M1/C1 [DATASHEET]
7647O–AVR–01/15
MICROCHIP [ MICROCHIP ]
