MLX90121

13.56MHz RFID Transceiver

3901090121

Page 8 of 26

Data Sheet

Rev. 007

Jan-2008

9. Block Diagram

10. Digital Interface

The MLX90121 is driven by four signals: MODE and RTB pins are used to select the operating mode and

DIN and CK pins are used to configure the chip and to transmit data.

The MLX90121 has two signal outputs. DOUT contains the decoded response of the transponder and

DSYNC is used as a synchronization output by the microcontroller.

Pin Name

I/O

Function

MODE

RTB

DIN

CK

DOUT

DSYNC

I

I

I

I

O

O

0 = Configuration Mode, 1 = Communication Mode

0 = Transmission Mode, 1 = Reception Mode

Data Input for Transmission or Configuration

Clock and Trigger

Data Output from Reception or Configuration

Data Synchronization Clock for Transmission or Reception

Function Summary

MODE

RTB

Function

0

0

Configuration

1

0

Transmission

0

1

Reserved (*)

1

1

Reception

(*) the reserved mode is for manufacturing purpose only and should not be applied by the user.

PA

RX

TX

13.56MHz

FSK

Decoder

PSK

Decoder

AM

FM

Majority

Voting

DOUT

Programmable

Encoder

DIN

Digital

RMOD

XTAL

XBUF