srt512 STMicroelectronics, srt512 Datasheet - Page 20

• Manufacturer Part Number: srt512
• Description: 13.56 Mhz Short-range Contactless Memory Chip With 512-bit Eeprom And Anticollision Functions
• Manufacturer: STMicroelectronics

SRT512 operation
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SRT512 operation
All commands, data and CRC are transmitted to the SRT512 as 10-bit characters using ASK
modulation. The start bit of the 10 bits, b
SRT512 at the antenna is demodulated by the 10% ASK demodulator, and decoded by the
internal logic. Prior to any operation, the SRT512 must have been selected by a SELECT
command. Each frame transmitted to the SRT512 must start with a Start Of Frame, followed
by one or more data characters, two CRC Bytes and the final End Of Frame. When an
invalid frame is decoded by the SRT512 (wrong command or CRC error), the memory does
not return any error code.
When a valid frame is received, the SRT512 may have to return data to the reader. In this
case, data is returned using BPSK encoding, in the form of 10-bit characters framed by an
SOF and an EOF. The transfer is ended by the SRT512 sending the 2 CRC Bytes and the
EOF.
0
, is sent first. The command frame received by the
SRT512