MLX90109 datasheet(2/16 Pages) MELEXIS

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MLX90109

125kHz RFID Transceiver

3901090109

Page 2 of 16

Data Sheet

Rev 011

Jun/12

1 Functional diagram

2 Description

The MLX90109 is a single chip RFID transceiver

for the 125kHz frequency range.

It has been

conceived for minimum system cost and minimum

power consumption, offering all required flexibility

for a state of the art AM transceiver base station.

An external coil (L), and capacitor (C) are

connected as a parallel resonant circuit, that

determines the carrier frequency and the oscillator

frequency of the reader.

This eliminates zero

modulation effects by perfect antenna tuning, and

avoids the need for an external oscillator.

The reader IC can easily be switched to power

down by setting the antenna amplitude to zero.

The MLX90109 can be configured to decode the

transponder signal on-chip.

In this case the

decoded signal is available through a 2-wire

interface with clock and data.

For minimum

interface wiring, the non-decoded transponder

signal can also be made available on a single wire

interface.

VDD

COIL

MODU

MLX90109

RC modulation

network

microcontroller

(1): MODE/SPEED config settings

(2): DATA/CLOCK outputs

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