TLE4998C4 Infineon Technologies, TLE4998C4 Datasheet - Page 41

• Manufacturer Part Number: TLE4998C4
• Description: IC HALL SENSOR LINEAR SSO-4
• Manufacturer: Infineon Technologies
• Type: Linear - Programmabler

Specifications of TLE4998C4

• Sensing Range: -200mt Trip ~ 200mT Release
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 8mA
• Current - Output (max): 5mA
• Output Type: Digital, PWM (Current)
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 4-SIP, SSO-4-01
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Other names: SP000440972

12.7
The Checksum nibble is a 4-bit CRC of the data nibbles including the status nibble. The
CRC is calculated using a polynomial x
In the TLE4998C3C it is implemented as a series of XOR and shift operations as shown
in the following flowchart:
Figure 15
A microcontroller implementation may use an XOR command plus a small 4-bit lookup
table to calculate the CRC for each nibble.
Figure 16
Data Sheet
// 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++) {
}
; // finally check if Data [7] is equal to CheckSum
CheckSum = CheckSum ^ Data[i];
CheckSum = CrcLookup[CheckSum];
Checksum Nibble Details
Pre-initialization :
SEED = 0101 , use this
GENERATOR = 1101
CRC Calculation
Example Code for CRC Generation
constant as old CRC
value at first call
next Nibble
4
CRC calculation
+x
41
3
VALUE xor
xor SEED
+ x
VALUE
xor only if MSB = 1
<<1
SEED
GENPOLY
2
Nibble
VALUE
SEED
+ 1 with a seed value of 0101.
xor
0
SPC Output Definition
4x
TLE4998C3C
Rev 1.1, 2009-09