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TLE4998S3 데이터시트(PDF) 38 Page - Infineon Technologies AG

부품명 TLE4998S3
상세설명  Programmable Linear Hall Sensor
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제조업체  INFINEON [Infineon Technologies AG]
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TLE4998S3 데이터시트(HTML) 38 Page - Infineon Technologies AG

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TLE4998S
SENT Output Definition (SAE J2716)
Data Sheet
38
V 1.0, 2008-07
13.3
Checksum Nibble Details
The Checksum nibble is a 4-bit CRC of the data nibbles including the status nibble. The
CRC is calculated using a polynomial x4 +x3 + x2 + 1 with a seed value of 0101.
In the TLE4998S it is implemented as a series of XOR and shift operations as shown in
the following flowchart:
Figure 14
CRC Calculation
A microcontroller implementation may use an XOR command plus a small 4-bit lookup
table to calculate the CRC for each nibble.
Figure 15
Example Code for CRC Generation
GENERATOR = 1101
SEED = 0101 , use this
constant as old CRC
value at first call
Pre-initialization :
VALUE
xor SEED
xor only if MSB = 1
VALUE
SEED
0
<<1
GENPOLY
xor
VALUE xor
SEED
4x
CRC calculation
Nibble
next Nibble
// Fast way for any µC with low memory and compute capabilities
char Data[8] = {…}; // contains the input data (status nibble , 6 data nibble , CRC)
// required variables and LUT
char CheckSum, i;
char CrcLookup[16] = {0, 13, 7, 10, 14, 3, 9, 4, 1, 12, 6, 11, 15, 2, 8, 5};
CheckSum= 5; // initialize checksum with seed "0101"
for (i=0; i<7; i++) {
CheckSum = CheckSum ^ Data[i];
CheckSum = CrcLookup[CheckSum];
}
; // finally check if Data [7] is equal to CheckSum


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