QT60248-ASG Atmel, QT60248-ASG Datasheet - Page 26

• Manufacturer Part Number: QT60248-ASG
• Description: IC SENSOR QMATRIX 24CHAN 32TQFP
• Manufacturer: Atmel
• Series: QMatrix™, QProx™r
• Type: Capacitiver

Specifications of QT60248-ASG

• Number Of Inputs/keys: 24 Key
• Resolution (bits): 9, 11 b
• Data Interface: Serial, SPI™
• Voltage - Supply: 3 V ~ 5 V
• Current - Supply: 25mA
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 32-TQFP, 32-VQFP
• Output Type: Logic
• Interface: SPI
• Input Type: Logic
• Operating Supply Voltage: 3 V to 5 V
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• For Use With: 427-1087 - BOARD EVAL QT60248-AS QMATRIX
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 427-1108

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
26
QT60248-AS R4.02/0405