MLX90121 Просмотр технического описания (PDF) - Melexis Microelectronic Systems

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MLX90121

13.56MHz RFID Transceiver

Melexis Microelectronic Systems  

MLX90121

13.56MHz RFID Transceiver

11.3.2.b. Direct Reception

After analog processing, data reception can be either direct or pre-processed by hardware accelerators,

according to the configuration of the SelDOUT parameter in the DigitalConfig register.

SelDout

00

01

10

11

Output

AM (direct)

FM (direct)

FSK (423/484 kHz)

PSK (847 kHz)

Hardware

--

--

FSK decoder

PSK decoder

ISO Standard

ISO15693-Single Sub-carrier

--

ISO15693-Dual Sub-carrier

ISO14443-B

Note

• The output phase of PSK decoder is either normal or inverted.

Direct reception is achieved with the following setup.

Signal

MODE

RTB

DIN

CK

DOUT

DSYNC

Assign

1

1

1

0

Received data

x

11.3.2.c. Reception with Majority Voting (MV)

Majority voting allows to:

• Filter noisy signal,

• Compensate for jitter,

• Correct distorted signals.

At the beginning of the time slot (MVTime), an up / down counter is reset. When the input signal is

asserted high, it is counting up and when the input signal is asserted low, it is counting down. At the end

of time slot, the counter value is checked and the output value is set accordingly (low if counter is

negative; high if counter is positive).

D1

D2

Input

signal

Majority

Voting

0 1 0 1 2 1 2 3 0 1 0 -1 -2 -3 -2 -3

MV output

D1

D2

MVTime

Majority Voting Setup

The following parameters in the DigitalConfig register have to be set when using majority voting.

• MVEn: it enables the majority voting function.

• DecTimeRef: it defines the duration of the time slot (MVTime)

3901090121

Rev. 009

Page 15 of 26

Data Sheet

Sept.-2009

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