SRI4K datasheet(19/45 Pages) STMICROELECTRONICS

Part #	SRI4K

Description	13.56 MHz short-range contactless memory chip with 4096-bit EEPROM and anticollision functions

PDF	45 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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19 / 45 page

SRI4K

SRI4K operation

19/45

SRI4K operation

All commands, data and CRC are transmitted to the SRI4K as 10-bit characters using ASK

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

SRI4K at the antenna is demodulated by the 10% ASK demodulator, and decoded by the

internal logic. Prior to any operation, the SRI4K must have been selected by a Select

command. Each frame transmitted to the SRI4K 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 SRI4K (wrong command or CRC error), the memory does not

return any error code.

When a valid frame is received, the SRI4K 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 SRI4K sending the 2 CRC bytes and the

EOF.

SRI4K Datasheet(PDF) 19 Page - STMicroelectronics