Datasheet

1 to 8 Data Fields

Checksum

Field

Response

+ INVERT

Modulo-256 sum

Checkbyte

ID Field

From

Header

1 to 8 Data Fields

Checksum

Field

Response

+ INVERT

Modulo-256 sum

Checkbyte

LIN

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28.3.1.8.4 Checksum Errors

A checksum error (CE) is detected and flagged at the receiving end if the calculated modulo-256 sum over

all received data bytes (including the ID byte if it is the enhanced checksum type) plus the checksum byte

does not result in 0xFF. The modulo-256 sum is calculated over each byte by adding with carry, where the

carry bit of each addition is added to the LSB of its resulting sum.

For the transmitting node, the checksum byte sent at the end of a message is the inverted sum of all the

data bytes (see Figure 28-22) for classic checksum implementation. The checksum byte is the inverted

sum of the identifier byte and all the data bytes (see Figure 28-23) for the LIN 2.0 compliant enhanced

checksum implementation. The classic checksum implementation should always be used for reserved

identifiers 60 to 63; therefore, the CTYPE bit will be overridden in this case. For signal-carrying-frame

identifiers (0 to 59) the type of checksum used depends on the CTYPE bit.

Figure 28-22. Classic Checksum Generation at Transmitting Node

Figure 28-23. LIN 2.0-Compliant Checksum Generation at Transmitting Node

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Serial Communication Interface (SCI)/Local Interconnect Network (LIN) SPNU562–May 2014

Module

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