SRT512 datasheet(20/46 Pages) STMICROELECTRONICS

Part #	SRT512

Description	13.56 MHz short-range contactless memory chip with 512-bit EEPROM and anticollision functions

PDF	46 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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20 / 46 page

SRT512 operation

SRT512

20/46

Doc ID 13277 Rev 4

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, b0, is sent first. The command frame received by the

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.

SRT512 Datasheet(PDF) 20 Page - STMicroelectronics