AN2503 Freescale Semiconductor / Motorola, AN2503 Datasheet - Page 2

• Manufacturer Part Number: AN2503
• Description: Slave LIN Driver for the MC68HC908QT/QY Family
• Manufacturer: Freescale Semiconductor / Motorola

AN2503/D
LIN Basic Concepts
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LIN is a popular, low-cost serial communication system designed to support the
lowest level of automotive networks in existing CAN networks with hierarchical
designs. The lowest level of a hierarchical network, LIN enables cost-effective
communication with sensors and actuators when all the features of CAN are
not required.
LIN is a single-master/multiple-slave protocol. In a hierarchical network, a
master is usually a more powerful microcontroller with other network interfaces
available, like CAN. This allows several inexpensive slaves with minimum
requirements and low complexity to perform different tasks under the control of
one master. In this way, collisions are avoided and there is no need for bus
arbitration.
LIN’s main features are:
See
concepts.
Slave LIN Driver for the MC68HC908QT/QY Family
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Freescale Semiconductor, Inc.
References and Recommended Links
For More Information On This Product,
MASTER CONTROL UNIT
Minimal hardware requirements — Only one bidirectional line of
communication, allowing a baud rate as high as 20 kbps
Synchronization frame available — No need for crystals or ceramic
resonators, which is very useful in a low-cost environment
Integrated routines — Data checksum in each frame and error detection
in physical layer (bit error) and data link layer (two parity bits)
Standard protocol — Based on the standard UART/SCI, which is very
common, allowing easier debugging and a better understanding of the
protocol
MASTER TASK
SLAVE TASK
Figure 1
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shows this concept of communication.
BUS
Figure 1. LIN Concept
SLAVE CONTROL UNIT
SLAVE TASK
for more information on LIN basic
SLAVE CONTROL UNIT
SLAVE TASK
MOTOROLA