QT60168-ASG QUANTUM ATMEL, QT60168-ASG Datasheet - Page 26

• Manufacturer Part Number: QT60168-ASG
• Description: IC, 16, 24 KEY QMATRIX SENSOR, TQFP-32
• Manufacturer: QUANTUM ATMEL

Specifications of QT60168-ASG

• Supply Current: 25mA
• Ic Interface Type: Serial, SPI
• Supply Voltage Range: 3V To 5.25V
• Sensor Case Style: TQFP
• No. Of Pins: 32
• Operating Temperature Range: -40°C To +105°C
• Termination Type: SMD
• Ic Function: 16, 24 KEY QMATRIX
• Digital Ic Case Style: TQFP
• Operating Temperature Max: 105°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7 Appendix
7.1 8-Bit CRC Algorithm
// 8 bits crc calculation. Initial value is 0.
// polynomial = X
// data is an 8 bit number;
unsigned char eight_bit_crc(unsigned char crc, unsigned char data)
{ unsigned char index;
}
A CRC calculator for Windows is available free of charge from Quantum Research.
lQ
unsigned char fb;
index = 8;
do
{ fb = (crc ^ data) & 0x01;
} while(--index);
data >>= 1;
crc >>= 1;
If(fb)
{ crc ^= 0x8c;
}
return crc;
8
+ X
5
// initialise the shift counter
+ X
4
+ 1
crc is a 8 bit number
// shift counter
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QT60248-AS R4.02/0405