MLX90109 View Datasheet(PDF) - Melexis Microelectronic Systems

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Description

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MLX90109

125kHz RFID Transceiver

Melexis Microelectronic Systems  

MLX90109

125kHz RFID Transceiver

1. Functional diagram

VDD

VDD

MLX90109

COIL

MODU RC modulation

network

microcontroller

(1): MODE/SPEED config settings

(2): DATA/CLOCK outputs

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.

REVISION 011 - JUNE 19, 2017

3901090109

Page 2 of 17

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