MLX90121 Ver la hoja de datos (PDF) - Melexis Microelectronic Systems

Número de pieza

componentes Descripción

Fabricante

MLX90121

13.56MHz RFID Transceiver

Melexis Microelectronic Systems  

MLX90121

13.56MHz RFID Transceiver

11.3.1.b. Direct Transmission

Before analog processing, data transmission can be either direct or pre-processed by means of hardware

accelerators. Direct transmission can be performed with the following setup:

Signal

MODE

RTB

DIN

CK

OUT

DSYNC

Assign

1

0

Data to transmit

0

x

x

Data has to be transmitted in real time by the microcontroller on DIN input. The modulation is done when

DIN is asserted low, so by default DIN has to be asserted high. If a configuration register has to be

written, keep DIN high when MODE is asserted low. In configuration mode, the field is held without

modulation independently of DIN.

11.3.1.c. Hardware Encoding Transmission

This programmable encoder allows predefining six different patterns of 8 bits. The encoder is selected by

setting the bit EncoderEn in the DigitalConfig register.

Symbol Setup

The six symbols are called EncoderSym0 to EncoderSym5. There is a seventh symbol which is hard-

coded to 0xFF (11111111).

A symbol is built with 8 bits as shown in the following figure.

Symbol

Code

1 0 1 11 0 11

ISO Examples

The ISO15693 protocol, mode 1 out of 4, is implemented using six symbols as shown in the following

table. Start of frame (SOF), end of frame (EOF) and pulses are all encoded using one symbol.

ISO15693 (1 out of 4)

Symbol

Sym0

Sym1

Sym2

Sym3

Sym4

Sym5

Name

Pulse1

Pulse2

Pulse3

Pulse4

SOF

EOF

Code

10111111

11101111

11111011

11111110

01111011

11011111

3901090121

Rev. 009

Page 11 of 26

Data Sheet

Sept.-2009

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