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

MODE

DIN

CK

RTB

Address

Data

MSB

LSB MSB

LSB

After sending address and data, the MODE line is asserted high and the chip is ready to receive the next

register configuration.

Signal

MODE

RTB

DIN

CK

DOUT

DSYNC

Assign

0

0

4-bit Address + 8-bit Data

12 clock pulses

x

x

Notes

1. If a register does not contain eight bits, write ‘0’ in the unused bit.

2. When MODE is asserted high, the chip is in communication mode. If the encoder is disabled (by

default), DIN has to be kept at ‘1’ to avoid any modulation on the antenna.

3. In case of successive registers writings, it is mandatory to have MODE asserted high for at least

Tmw = 5µs in between each access, as shown in the following diagram.

Writing 1

Tmw

Writing 2

MODE

CK

11.3. Communication Modes

11.3.1. Transmission

11.3.1.a. Analog Setup

For the transmission, the modulation depth has to be chosen. This is done by the TModIndex bit of the

AnalogConfig register, which selects the modulation index: 10% or 100%.

The modulation index can be further tuned by means of the external RMOD resistor.

3901090121

Rev. 009

Page 10 of 26

Data Sheet

Sept.-2009

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