SRI2K datasheet(19/45 Pages) STMICROELECTRONICS

Teilenummer	SRI2K

Bauteilbeschribung	13.56 MHz short-range contactless memory chip with 2048-bit EEPROM and anticollision functions

PDF	45 Pages

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Hersteller	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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SRI2K

SRI2K operation

Doc ID 15779 Rev 3

19/45

SRI2K operation

All commands, data and CRC are transmitted to the SRI2K as 10-bit characters using ASK

modulation. The start bit of the 10 bits, b0, is sent first. The command frame received by the

SRI2K at the antenna is demodulated by the 10% ASK demodulator, and decoded by the

internal logic. Prior to any operation, the SRI2K must have been selected by a Select

command. Each frame transmitted to the SRI2K 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 SRI2K (wrong command or CRC error), the memory does not

return any error code.

When a valid frame is received, the SRI2K 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 SRI2K sending the 2 CRC bytes and the

EOF.

SRI2K Datenblatt(PDF) 19 Page - STMicroelectronics